Subjects -> TRANSPORTATION (Total: 213 journals)
    - AIR TRANSPORT (9 journals)
    - AUTOMOBILES (26 journals)
    - RAILROADS (10 journals)
    - ROADS AND TRAFFIC (9 journals)
    - SHIPS AND SHIPPING (40 journals)
    - TRANSPORTATION (119 journals)

TRANSPORTATION (119 journals)                     

Showing 1 - 53 of 53 Journals sorted alphabetically
Accident Analysis & Prevention     Hybrid Journal   (Followers: 117)
Analytic Methods in Accident Research     Hybrid Journal   (Followers: 8)
Applied Mobilities     Hybrid Journal   (Followers: 2)
Archives of Transport     Open Access   (Followers: 18)
Asian Transport Studies     Open Access  
Botswana Journal of Technology     Full-text available via subscription   (Followers: 1)
Case Studies on Transport Policy     Hybrid Journal   (Followers: 16)
Cities in the 21st Century     Open Access   (Followers: 15)
Danish Journal of Transportation Research / Dansk Tidsskrift for Transportforskning     Open Access   (Followers: 2)
Decision Making : Applications in Management and Engineering     Open Access   (Followers: 1)
Economics of Transportation     Partially Free   (Followers: 14)
Emission Control Science and Technology     Hybrid Journal   (Followers: 2)
eTransportation     Open Access   (Followers: 2)
EURO Journal of Transportation and Logistics     Hybrid Journal   (Followers: 15)
European Transport Research Review     Open Access   (Followers: 24)
Geosystem Engineering     Hybrid Journal   (Followers: 2)
IATSS Research     Open Access  
IEEE Open Journal of Intelligent Transportation Systems     Open Access   (Followers: 7)
IEEE Vehicular Technology Magazine     Full-text available via subscription   (Followers: 7)
IET Electrical Systems in Transportation     Hybrid Journal   (Followers: 11)
IET Intelligent Transport Systems     Hybrid Journal   (Followers: 11)
IFAC-PapersOnLine     Open Access   (Followers: 1)
International Journal of Applied Logistics     Full-text available via subscription   (Followers: 11)
International Journal of Crashworthiness     Hybrid Journal   (Followers: 12)
International Journal of e-Navigation and Maritime Economy     Open Access   (Followers: 5)
International Journal of Electric and Hybrid Vehicles     Hybrid Journal   (Followers: 11)
International Journal of Electronic Transport     Hybrid Journal   (Followers: 9)
International Journal of Heavy Vehicle Systems     Hybrid Journal   (Followers: 7)
International Journal of Intelligent Transportation Systems Research     Hybrid Journal   (Followers: 14)
International Journal of Mobile Communications     Hybrid Journal   (Followers: 9)
International Journal of Ocean Systems Management     Hybrid Journal   (Followers: 3)
International Journal of Services Technology and Management     Hybrid Journal   (Followers: 1)
International Journal of Sustainable Transportation     Hybrid Journal   (Followers: 18)
International Journal of Traffic and Transportation Engineering     Open Access   (Followers: 18)
International Journal of Transportation Engineering     Open Access   (Followers: 1)
International Journal of Transportation Science and Technology     Open Access   (Followers: 11)
International Journal of Vehicle Systems Modelling and Testing     Hybrid Journal   (Followers: 3)
Journal of Advanced Transportation     Hybrid Journal   (Followers: 16)
Journal of Big Data Analytics in Transportation     Hybrid Journal   (Followers: 1)
Journal of Mechatronics, Electrical Power, and Vehicular Technology     Open Access   (Followers: 6)
Journal of Modern Transportation     Full-text available via subscription   (Followers: 9)
Journal of Navigation     Hybrid Journal   (Followers: 279)
Journal of Sport & Social Issues     Hybrid Journal   (Followers: 12)
Journal of Sustainable Mobility     Full-text available via subscription   (Followers: 3)
Journal of Traffic and Transportation Engineering (English Edition)     Open Access   (Followers: 5)
Journal of Transport & Health     Hybrid Journal   (Followers: 10)
Journal of Transport and Land Use     Open Access   (Followers: 25)
Journal of Transport and Supply Chain Management     Open Access   (Followers: 16)
Journal of Transport Geography     Hybrid Journal   (Followers: 28)
Journal of Transport History     Hybrid Journal   (Followers: 12)
Journal of Transportation and Logistics     Open Access   (Followers: 4)
Journal of Transportation Safety & Security     Hybrid Journal   (Followers: 11)
Journal of Transportation Security     Hybrid Journal   (Followers: 3)
Journal of Transportation Systems Engineering and Information Technology     Full-text available via subscription   (Followers: 12)
Journal of Transportation Technologies     Open Access   (Followers: 15)
Journal of Waterway Port Coastal and Ocean Engineering     Full-text available via subscription   (Followers: 8)
Journal on Vehicle Routing Algorithms     Hybrid Journal  
Les Dossiers du Grihl     Open Access   (Followers: 1)
LOGI ? Scientific Journal on Transport and Logistics     Open Access   (Followers: 1)
Logistics     Open Access   (Followers: 3)
Logistics & Sustainable Transport     Open Access   (Followers: 6)
Logistique & Management     Hybrid Journal  
Mobility in History     Full-text available via subscription   (Followers: 5)
Modern Transportation     Open Access   (Followers: 12)
Nonlinear Dynamics     Hybrid Journal   (Followers: 19)
Open Journal of Safety Science and Technology     Open Access   (Followers: 17)
Open Transportation Journal     Open Access  
Packaging, Transport, Storage & Security of Radioactive Material     Hybrid Journal   (Followers: 4)
Periodica Polytechnica Transportation Engineering     Open Access  
Pervasive and Mobile Computing     Hybrid Journal   (Followers: 8)
Proceedings of the Institution of Mechanical Engineers Part F: Journal of Rail and Rapid Transit     Hybrid Journal   (Followers: 15)
Promet : Traffic &Transportation     Open Access  
Public Transport     Hybrid Journal   (Followers: 20)
Recherche Transports Sécurité     Hybrid Journal   (Followers: 1)
Research in Transportation Business and Management     Partially Free   (Followers: 8)
Revista Transporte y Territorio     Open Access   (Followers: 1)
Revue Marocaine de Management, Logistique et Transport     Open Access  
Romanian Journal of Transport Infrastructure     Open Access   (Followers: 1)
SourceOCDE Transports     Full-text available via subscription   (Followers: 2)
Sport, Education and Society     Hybrid Journal   (Followers: 13)
Sport, Ethics and Philosophy     Hybrid Journal   (Followers: 3)
Streetnotes     Open Access   (Followers: 1)
Synthesis Lectures on Mobile and Pervasive Computing     Full-text available via subscription   (Followers: 1)
Tire Science and Technology     Full-text available via subscription   (Followers: 3)
Transactions on Transport Sciences     Open Access   (Followers: 6)
Transport     Open Access   (Followers: 17)
Transport and Telecommunication     Open Access   (Followers: 5)
Transport in Porous Media     Hybrid Journal   (Followers: 1)
Transport Problems     Open Access   (Followers: 5)
Transport Reviews: A Transnational Transdisciplinary Journal     Hybrid Journal   (Followers: 10)
Transport technic and technology     Open Access   (Followers: 1)
Transportation     Hybrid Journal   (Followers: 33)
Transportation Geotechnics     Full-text available via subscription   (Followers: 1)
Transportation in Developing Economies     Hybrid Journal  
Transportation Infrastructure Geotechnology     Hybrid Journal   (Followers: 8)
Transportation Journal     Full-text available via subscription   (Followers: 16)
Transportation Letters : The International Journal of Transportation Research     Hybrid Journal   (Followers: 6)
Transportation Research Interdisciplinary Perspectives     Open Access   (Followers: 3)
Transportation Research Part A: Policy and Practice     Hybrid Journal   (Followers: 41)
Transportation Research Part B: Methodological     Hybrid Journal   (Followers: 39)
Transportation Research Part C: Emerging Technologies     Hybrid Journal   (Followers: 31)
Transportation Research Procedia     Open Access   (Followers: 7)
Transportation Research Record : Journal of the Transportation Research Board     Full-text available via subscription   (Followers: 36)
Transportation Safety and Environment     Open Access   (Followers: 2)
Transportation Science     Full-text available via subscription   (Followers: 25)
Transportation Systems and Technology     Open Access  
TRANSPORTES     Open Access   (Followers: 6)
Transportmetrica A : Transport Science     Hybrid Journal   (Followers: 8)
Transportmetrica B : Transport Dynamics     Hybrid Journal   (Followers: 1)
Transportrecht     Hybrid Journal   (Followers: 1)
Travel Behaviour and Society     Full-text available via subscription   (Followers: 11)
Travel Medicine and Infectious Disease     Hybrid Journal   (Followers: 4)
Urban Development Issues     Open Access   (Followers: 3)
Urban, Planning and Transport Research     Open Access   (Followers: 32)
Vehicles     Open Access  
Vehicular Communications     Full-text available via subscription   (Followers: 4)
World Electric Vehicle Journal     Open Access  
World Review of Intermodal Transportation Research     Hybrid Journal   (Followers: 6)
Транспортні системи та технології перевезень     Open Access  

           

Similar Journals
Journal Cover
Transportation Geotechnics
Journal Prestige (SJR): 1.149
Citation Impact (citeScore): 2
Number of Followers: 1  
 
  Full-text available via subscription Subscription journal
ISSN (Online) 2214-3912
Published by Elsevier Homepage  [3203 journals]
  • Analysis of resonance effect for a railway track on a layered ground
    • Abstract: Publication date: September 2018Source: Transportation Geotechnics, Volume 16Author(s): J.Y. Shih, D.J. Thompson, E. NtotsiosAbstractWhen a train runs on soft ground it can approach or even exceed the speed of surface waves in the ground. Under such conditions the amplitudes of the track response increase considerably. Moreover, a resonance-like phenomenon can occur in which a clear oscillation trail can be observed behind the moving axle loads. An investigation is presented of this resonance frequency and the critical speed effect for a track on a layered half-space subject to a moving load. Three different methods are used to investigate this resonance frequency: (i) the spectrum of the response to a moving load, (ii) analysis of the dispersion curves of the ground, and (iii) frequency analysis of the response to a stationary load. A parameter study is presented of a layered half-space ground with different P-wave speeds, S-wave speeds, and depth of the upper layer. The critical speeds are found in each case; in such a layered ground, the critical speed is greater than the Rayleigh wave speed of the soft upper layer due to the influence of the underlying half-space. The oscillating frequencies are shown to vary with the speed of the moving load, tending to reduce when the load speed increases. The P-wave speeds of both the upper layer and the underlying half-space are found to have negligible influence on the critical velocity and on the oscillating frequency; the S-wave speed of the half-space has only a small influence. Larger differences are found when the depth of the layer is varied. Finally, a formula for calculating this resonance frequency is proposed.
       
  • Investigation of embankment deformation mechanisms in permafrost regions
    • Abstract: Publication date: September 2018Source: Transportation Geotechnics, Volume 16Author(s): Feng Ming, Qi-hao Yu, Dong-qing LiAbstractA numerical model including heat transfer, soil compression, thaw consolidation, and creep was established to analyze the embankment deformation in permafrost. The settlement behavior of an embankment along the Qinghai-Tibet Highway was simulated using Abaqus software. The settlement mechanism was analyzed based on the distribution of additional stress and settlement at different depths. It was found that (1) the embankment can be treated as an additional load on the underlying natural ground; the additional stress is mainly distributed underneath the embankment and has an effect up to 3 m depth; (2) the large amount of heat absorbed by the asphalt pavement created a thermal disturbance that caused permafrost degradation under the embankment, and a small stress can resulting in large settlement; (3) soil compression, thaw settlement, and permafrost creep all contributed to the total settlement. The permafrost degradation was the dominant process affecting the embankment deformation. Therefore, engineering measures should be considered to protect the permafrost underneath the embankment during the design process.
       
  • Impact of pavement layer properties on the structural performance of
           inundated flexible pavements
    • Abstract: Publication date: September 2018Source: Transportation Geotechnics, Volume 16Author(s): Mohamed Elshaer, Jo Sias DanielAbstractThe assessment of the structural performance of flooded pavements remains complicated due to the lack of structural data in the aftermath of flooding and the fact that information about the pavement structure and materials is not always readily available. The objective of this study is to acquire a better understanding of the structural response of pavements that have been inundated and the foreseen changes in capacity using two approaches: a mechanistic approach using layer elastic analysis and the AASHTO empirical approach to determine the structural number. The relative impact of parameters such as unbound material type, layer thickness, traffic loads, and interlayer bond conditions on the reduction in expected strain values at critical locations were evaluated. The results show increases of 15–80% in vertical strains at the top of subgrade layer for low volume and interstate sections and 6–15% increase in horizontal strain at the bottom of asphalt layer for low volume sections and 3–8% for interstate sections. Accurate information on the layer thicknesses, traffic type, and interlayer bond condition were found to be most important for the evaluation of the change in expected horizontal strain. The types of base and subgrade materials are the most important factors for evaluating the change in expected vertical strain. The results of this study provide guidance on the type of information that is most important to collect for the assessment of the structural capacity of a pavement following inundation.
       
  • Laboratory-scale model studies on corduroy-reinforced road embankments on
           peat foundations using transparent soil
    • Abstract: Publication date: September 2018Source: Transportation Geotechnics, Volume 16Author(s): Earl Marvin B. De Guzman, Marolo C. AlfaroAbstractTest sections of a road embankment on peat were instrumented to investigate their performance and to develop more economical means of construction method. One test section was constructed with only geotextile at its base and another with both geotextile and corduroy. Laboratory-scale physical model tests were undertaken to improve the understanding of the operating mechanisms involved in the performance of the two test sections. Artificial transparent soil that has similar deformation properties of natural clays and peats was used as foundation material. It allows determination of spatial displacements beneath the embankment using Particle Image Velocimetry (PIV) technique. The load-settlement behaviour of the test sections were reasonably simulated in the laboratory-scale physical model tests. Displacement patterns from PIV indicate that embankment with geotextile layer and corduroy has less settlements and lateral movements in the foundation compared to that of the embankment with geotextile layer only.
       
  • Evaluation of plate load based testing approaches in measuring stiffness
           parameters of pavement bases
    • Abstract: Publication date: September 2018Source: Transportation Geotechnics, Volume 16Author(s): Prajwol Tamrakar, Soheil NazarianAbstractIn situ tests such as the traditional plate load tests (PLT) or light weight deflectometer (LWD) tests can be used for determining the stiffness parameters of pavement layers, since field measurements yield more practical and realistic results. The stiffness parameters of twelve large-scale laboratory specimens, prepared using four fines contents and three moisture contents, were measured almost simultaneously with PLT and LWD tests. The impacts of variation in fines content and moisture content of base specimens on the moduli measured with these two tests were evaluated, reported and discussed. The LWD moduli demonstrated the same pattern as the PLT moduli computed with different plate diameters and contact pressures. The strongest correlation between the LWD and PLT moduli was observed when the loading plate diameters were the same and the peak contact pressures were similar.
       
  • Drainage Potential of Reservoir Course of Porous Pavement for Various
           Particle Size Distributions of Aggregate
    • Abstract: Publication date: Available online 5 July 2018Source: Transportation GeotechnicsAuthor(s): Mehdi Koohmishi, Gholamali ShafabakhshAbstractPorous pavements are constructed to allow surface water to pass freely through the pavement structure and finally to percolate into the underlying soil. The main advantages of these pavements are managing storm water as well as reducing runoff quantity in urban roadways. The reservoir course consisting of coarse aggregate with high values of air void functions as an important layer for proper performance of the porous pavement to provisionally store water and slowly release it into the underlying soil. In the present study, the hydraulic conductivity of reservoir layer is experimentally determined by providing different sieve size ranges of aggregate and considering the non-laminar flow condition. Then, imaging-based analysis of two dimensional (2D) horizontal images captured from tested aggregate specimens is carried out to further illuminate the percentage of pore area between coarse aggregate and drainage potential of the reservoir course with different particle size distributions. Obtained results show that providing smaller-sized gradation of aggregate (especially with lower effective diameter) leads to the reduction of the permeability of reservoir course. Also, consideration of uniform gradation with narrow range of particle sizes results in estimation of higher values of hydraulic conductivity coefficient. Furthermore, analysis of the 2D horizontal images indicates less percentage of pore area for established gradations with broad range of particle sizes and lower values of effective diameter. Generally, an inverse correlation is observed between the estimated pore area as well as the computed volumetric air void content with the experimentally determined hydraulic conductivity.
       
  • Spatial Variability of Compacted Aggregate Bases
    • Abstract: Publication date: Available online 28 June 2018Source: Transportation GeotechnicsAuthor(s): Hani H. Titi, Habib Tabatabai, Ahmed Faheem, Erol Tutumluer, Jed P. PetersAbstractThis paper evaluates the construction quality of aggregate base course layers in terms of the variability and uniformity in density and modulus based measurements. Field and laboratory tests were conducted on 10 aggregate base course layers during HMA pavement construction in Wisconsin. Field tests consisted of in-place unit weight, LWD, DCP, and Stiffness Gauge measurement while laboratory tests included particle size analysis, compaction test, and repeated load triaxial test. Moreover, sensitivity analysis was conducted to assess the influence of the base course layer input parameters on the long-term performance of HMA pavements using the AASHTOWare Pavement ME Design software. Field and laboratory test results demonstrated the existence of high spatial and depth variability in both density (relative compaction ranged from 82.6 to 109.1%, with 17% of test point having values < 90%) and modulus based measurements and predictions (LWD average base layer modulus varied between 86.5 and 220.3 MPa) of the constructed base course layers variables. In addition, a pilot density-based implementation phase undertaken by WisDOT demonstrated the existence of high spatial variability as well as variability along the depth of the constructed bases in the measurement of relative compaction and field water content. For a relative compaction specification of 95%, only 46% of the density tests were acceptable. The various test results presented in this paper demonstrated the variability and non-uniformity of important aggregate performance parameters in base layers, which have an impact on the long-term pavement performance.
       
  • Field instrumentations and monitoring of GeoBarrier System for steep slope
           protection
    • Abstract: Publication date: Available online 25 June 2018Source: Transportation GeotechnicsAuthor(s): H. Rahardjo, Y. Kim, N. Gofar, E.C. Leong, C.L. Wang, J.L.H. WongAbstractThis paper illustrates the application of capillary barrier system as protection of steep slope from rainfall-induced slope instability. In this regard, the mechanical instability of the slope is protected by a reinforced soil system with geobag as facing and geogrids as slope reinforcement. Combination of slope reinforcement and capillary barrier system to protect steep slope forms a GeoBarrier System (GBS). The capillary barrier was constructed using recycled concrete aggregate (RCA) of different particle sizes as fine- and coarse-grained layers. The fine-grained material was encapsulated in a geobag while the coarse-grained material is laid between the reinforced soil and the geobag. A pilot study was carried out in Singapore to evaluate the performance of the GBS when subjected to rainfall infiltration. The site was instrumented with a rain-gauge and two piezometers to monitor rainfall and groundwater response to rainfall. The slope was instrumented with tensiometers and soil moisture sensors as well as earth pressure cells to monitor the response to rainfall infiltration in terms of matric suction and deformation. An adjacent original slope was also instrumented to investigate the effectiveness of the GBS in reducing rainfall infiltration and maintaining the negative pore-water pressure. The detailed installation and instrumentation of the GBS and original slopes are discussed in this paper. Results show that the GBS was effective in maintaining the negative pore-water pressure; therefore, in maintaining the stability of the slope. On the other hand, the negative pore-water pressure and lateral earth pressure in the original slope were more affected by rainfall infiltration.
       
  • Importance of controlling the degree of saturation in soil compaction
           linked to soil structure design
    • Abstract: Publication date: Available online 15 June 2018Source: Transportation GeotechnicsAuthor(s): Fumio Tatsuoka, António Gomes CorreiaAbstractIn the typical conventional fill compaction, the dry density, ρd, and the water content, w, are controlled in relation to reference values, (ρd)max and wopt, determined by standard laboratory compaction tests using a representative sample at a certain compaction energy level, CEL. Although CEL and soil type affect significantly (ρd)max and wopt, they change inevitably, sometimes largely, in a given earthwork project while field CEL may not match the value used in the laboratory compaction tests. Compaction control based on only an index of strength/ stiffness of compacted soil has such a drawback that, for a fixed value of ρd, the index may increase significantly as the degree of saturation, Sr, of compacted soil becomes lower than the optimum degree of saturation (Sr)opt defined as Sr when (ρd)max is obtained for a given CEL. In comparison, the value of (Sr)opt and the unified compaction curve in terms of ρd/(ρd)max vs. Sr − (Sr)opt relation of compacted soil are rather insensitive to variations in CEL and soil type. Besides, CBR (unsoaked and soaked), the unconfined compression strength, the elastic shear modulus and the collapse upon submerging of compacted soil and the cyclic undrained shear strength and the coefficient of hydraulic conductivity of saturated soil are all controlled by ρd and “Sr at the end of compaction”. As a standard method, it is proposed to control the values of w and ρd in such that Sr becomes (Sr)opt while ρd becomes large enough to ensue soil properties required in design fully taking advantage of available CEL. It is argued that the compaction control keeping Sr larger than a certain value (or the air void ratio va lower than a certain value) without controlling ρd is relevant as a simplified method only if Sr is controlled to become (Sr)opt while always keeping CEL high enough to ensure the soil properties required in design.
       
  • Long term cyclic behavior of unsaturated granular soils
    • Abstract: Publication date: Available online 7 June 2018Source: Transportation GeotechnicsAuthor(s): Jingyu Chen, Eduardo E. Alonso, Chuan Gu, Zhigang Cao, Yuanqiang CaiAbstractThe road base and subbase materials are normally situated in unsaturated conditions, and are subject to traffic loadings over a long period of time. To study the influences of matric suction on the long-term deformation of road base and subbase materials, the large-scale cyclic tri-axial apparatus, equipped with unsaturated system, was adopted to conduct tests on these unsaturated coarse granular materials. Four matric suction and three cyclic stress amplitudes were applied on the specimens through the apparatus. The axis-translation technique was used to control the matric suction in the specimen. The test results indicate that with the increase of matric suction, the axial accumulated strain decreases at the declining rate, and larger cyclic stress amplitude will strengthen the influence of matric suction. An improved cyclic model containing a new exponential function to describe the influence of matric suction was then proposed. By comparing the experimental results and the calculated results, the improved model was validated to be effective to predict the long-term deformation of unsaturated granular soils.
       
  • Influence of clay mineralogy on the relationship of CBR of fine-grained
           soils with their index and engineering properties
    • Abstract: Publication date: June 2018Source: Transportation Geotechnics, Volume 15Author(s): H.B. Nagaraj, M.R. SureshAbstractEvaluation of California Bearing Ratio (CBR) of subgrade soils used in the design of flexible pavements is quite elaborate and time consuming. Hence, the number of test locations is reduced and as a compromise, the lowest value of CBR adopted for each stretch having nearly similar geological origin, but probably having varied soil properties. This leads to an increased overlay thickness of flexible pavement, and consequent cost of construction. This shortcoming is overcome by predicting CBR through index properties, so that requisite value of CBR can be obtained from more number of soil samples obtained at closer intervals. Hence many attempts have been made in the past to develop correlations equations to predict CBR from simple index properties and also relate it with engineering properties. However, no study has brought out the influence clay mineralogy of the soil in those correlations. Findings from this study show that, clay mineralogy of soil has a significant influence on both CBR (indirect measure of strength) and Unconfined Compression strength (UCC) (direct measure of strength), having separate relationships based on whether the soil is kaolinitic or montmorillonitic. This observed mineralogical is reasoned out based on the mechanisms controlling undrained strength of clays. The developed correlations to predict CBR would serve as a valuable tool to have independent check on the large data of laboratory evaluated CBR values in routine engineering practice.
       
  • Characterizing strength and thermal properties of concrete for
           implementation of pavement mechanistic-empirical design in New Mexico
    • Abstract: Publication date: June 2018Source: Transportation Geotechnics, Volume 15Author(s): Gauhar Sabih, Rafiqul A. TarefderAbstractThe format of the design and performance prediction of rigid pavements was reformed with the advent of Pavement mechanistic-empirical (ME) design procedure, which now serves as the state-of-the-art tool in pavement design. Various state agencies have either completed or in the process of calibration of distress prediction models and characterization of concrete materials to provide accurate inputs required by Pavement ME design software. There are numerous concrete properties for which input data is required in ME design software, but with previous research, it was found that the concrete strength and thermal properties including elastic modulus, modulus of rupture and coefficient of thermal expansion (CTE) are the most important ones that affect the design and performance of rigid pavements. Accurate rigid pavement design is heavily dependent on accuracy of these material inputs. This study is part of a New Mexico Department of Transportation (NMDOT) research project that focuses on the development of guidelines for characterizing Portland cement concrete (PCC) materials for paving mixes being used in New Mexico. Concrete mixes with 5 different coarse aggregates were tested for these pivotal concrete properties at the curing age of 7, 14, 28 and 90 days, and for CTE at 28 days. The laboratory test results represent level 1 PCC material inputs. The data collected offered an excellent opportunity to validate and refine the ME default level 2 models for estimating flexural strength and elastic modulus based on compressive strength data. The data demonstrated a slight deviation from the nationally calibrated models. CTE values of concrete based on aggregate type were established for these paving mixes. Further analysis verified the benefit of using the level 1 inputs over the default level 3 inputs for accurate pavement design and performance prediction. It was also highlighted that transverse cracking is the most significantly affected performance parameter between the pavement designed with level 1 and level 3 material inputs.
       
  • Sodium chloride as a catalyser for crushed reclaimed asphalt pavement –
           Fly ash – Carbide lime blends
    • Abstract: Publication date: June 2018Source: Transportation Geotechnics, Volume 15Author(s): Nilo Cesar Consoli, Davi Novicki Giese, Helena Batista Leon, Douglas Martins Mocelin, Raquel Wetzel, Sérgio Filipe Veloso MarquesAbstractReclaimed asphalt pavement (RAP) is the name given to reused pavement materials comprising asphalt and aggregates. Recycled RAP is almost always returned back into the roadway structure in some form, usually incorporated as a stabilized aggregate in base or subbase construction. To produce a stabilized base or subbase aggregate, RAP must also be crushed and screened, then blended with one or more stabilization reagents so that the blended material, when compacted, will gain strength. The aim of this study is to evaluate the impact of sodium chloride (NaCl) on the compressive strength and the accumulated loss of mass (ALM) after wetting–drying cycles on a mixture of crushed RAP with fly ash (FA) and carbide lime (L) (both industrial residues). Stabilization was carried out considering blends of 75% RAP and 25% FA. The moulding points considered three different dry unit weights [18.5 kN/m3 (maximum dry density at modified energy Proctor) and two below 18.0 kN/m3 and 17.0 kN/m3], optimum mixture content at 9.0% and three different lime percentages (3.0%, 5.0% and 7.0%), as well as a 7-day curing period. The results indicate that adding 1.0% NaCl to the crushed RAP-FA-lime blends almost doubles strength for a 7-day curing period and reduces the ALM by an average of 50% in durability tests.
       
  • Neural network based model for estimation of the level of anisotropy of
           unbound aggregate systems
    • Abstract: Publication date: June 2018Source: Transportation Geotechnics, Volume 15Author(s): Reza S. Ashtiani, Dallas N. Little, Mohammad RashidiAbstractDirectional dependency of the materials properties in granular soils is an integral component of the analysis and design of pavement foundations. Laboratory determination of such anisotropic properties is often overlooked by design engineers due to the lack of available protocols, equipment, time constraints, and budgetary issues. This research strives to bridge this gap by investigating an alternative approach to provide a practical and reliable framework to estimate the level of anisotropy of unbound granular materials. To achieve this objective, an experiment design was developed to establish a comprehensive aggregate feature database. Nonlinear and cross anisotropic material properties were determined using Variable Dynamic Confining Pressure (VDCP) stress path tests in the laboratory. Particle geometry was characterized using the Aggregate Imaging System (AIMS). Scale parameters and shape parameters of the form, angularity and textural properties of the particles were incorporated in the aggregate database to account for the shape-induced anisotropy of particulate soils. Moisture state and density parameters were also incorporated in the database for further post processing. Several neural network models with different architectures were developed, and the performances of the models were assessed based on an unseen set of data. The impact of the neural network topologies on the performance of the models were also investigated in this research effort. The results indicate that increasing the number of hidden layers has negligible impact on the performance of the models. Additionally, a series of sensitivity analyses were performed to investigate the level of contribution of aggregate features on the anisotropic behavior of unbound granular materials. The results of the sensitivity analysis underscores the influence of aggregate angularity, fines content, surface macro-texture, as well as the parameters of the stress path tests, on the orthogonal load distribution capacity of aggregate layers.
       
  • Discussion of “Control factors for the long term compressive strength of
           lime treated sandy clay soil” by Nilo Cesar Consoli, Pedro Domingos
           Marques Prietto, Luizmar da Silva Lopes and Daniel Winter [Transport.
           Geotech. 1 (2014) 129–136] http://dx.doi.org/10.1016/j.trgeo.2014.07.005
           
    • Abstract: Publication date: June 2018Source: Transportation Geotechnics, Volume 15Author(s): Jair Arrieta Baldovino, Eclesielter Batista Moreira, Ronaldo L.S. Izzo
       
  • Modelling the effects of trafficking and tamping on scaled railway ballast
           in triaxial tests
    • Abstract: Publication date: June 2018Source: Transportation Geotechnics, Volume 15Author(s): Sinthuja Aingaran, Louis Le Pen, Antonis Zervos, William PowrieAbstractMost of the world’s railways are on ballasted track, which is generally used in preference to slab track because of its lower initial cost and the relative ease with which track geometry can be adjusted. However, the accumulation of track movements as a result of trafficking leads to a gradual deterioration in track line and level, hence the need for periodic corrective maintenance. This is usually by tamping; a process in which the track is lifted and vibrating tines are inserted into the ballast and moved horizontally to raise the ballast surface back to the required level. The period before further maintenance is required decreases with each tamp. This paper investigates one of the reasons for the deterioration in ballast robustness following tamping, with reference to triaxial tests on scaled ballast in which vertical loading cycles and the stress reversal caused below the railseat by tamping were simulated. It is shown that the stress reversal disrupts and loosens the vertical load bearing ballast structure developed during trafficking to support vertical train loads. On re-loading after tamping, the track settles significantly and, as a result of the loss of vertical load-bearing structure, with further load cycles rapidly returns to its reduced height. The implication is that maintenance by tamping is, on its own, disruptive to the structure and resilience of the ballast to vertical cyclic loading, and should be carried out as rarely as possible.
       
  • Numerical simulation and parametric analysis of multi-anchor walls using
           the finite element method
    • Abstract: Publication date: June 2018Source: Transportation Geotechnics, Volume 15Author(s): Greg A. Siemens, Richard J. Bathurst, Yoshihisa MiyataAbstractThe paper describes the first reported attempt to numerically simulate the performance of full-scale steel multi-anchor reinforced soil walls (MAWs) during construction using a commercially available two-dimensional finite element method (FEM) model. The numerical simulation results are compared to the measurements taken from three 6 m-high MAW structures that were constructed under carefully controlled in-door laboratory conditions. The walls were nominally identical but constructed with three different sandy soils varying with respect to soil stiffness and shear strength. Earth pressures and anchor loads were monitored during construction and in-situ anchor pullout tests were also performed. Numerical predictions are judged to be in reasonable agreement with most physical measurements. A novel technique was the use of in-situ anchor plate pullout test results to back-calculate initial elastic modulus values for the hyperbolic constitutive soil model used in the study. The physical and numerical results are extended by considering a wider range of wall parameters (initial soil stiffness, shear strength, anchor length and wall height) using the same FEM model. The results of this parametric analysis provide further insight into the influence of the magnitude of different input parameters including wall height on wall performance. The main objective of this study was to generate a satisfactory definition of end-of-construction conditions. The paper also reports the results of a series of case studies that can be used by design engineers to benchmark-test FEM models proposed for MAW projects that are too complicated for analysis and design using conventional simple strength-based internal stability methods and where performance-based design requires estimates of wall deformations.
       
  • Bearing capacity of composite foundation consisting of T-shaped
           soil-cement column and soft clay
    • Abstract: Publication date: June 2018Source: Transportation Geotechnics, Volume 15Author(s): Yaolin Yi, Songyu Liu, Anand J. PuppalaAbstractThe T-shaped column is a soil-cement column with two diameters, which is installed by foldable deep mixing blades for soft clay treatment. As a variable-diameter column, its design method is not well established, and this study focuses on the bearing capacity of composite foundation consisting of T-shaped columns and soft clay. A laboratory model test was employed to study the bearing capacity, stress distribution, and failure mode of the composite foundation. Twelve full-scale loading tests were performed in the field to study the geometrical parameters of composite foundation affecting on its bearing capacity. The experimental results indicated that the bearing capacity of composite foundation increased with increasing of the cap length and column diameter, and decreasing of the column spacing. The experimental results also revealed that the column failure might occur at the small-diameter column just below the column cap, which then led to the soil failure nearby. By including this additional failure mode, the design method for conventional column was adapted to estimate the bearing capacity of composite foundation consisting of T-shaped column and soft clay, and the method was validated by the experimental data.
       
  • A comparative study of the response of buried pipes under static and
           moving loads
    • Abstract: Publication date: June 2018Source: Transportation Geotechnics, Volume 15Author(s): Saif Alzabeebee, David N. Chapman, Asaad FaramarziAbstractThe buried pipes should be designed properly to withstand the loads imposed by the backfill soil weight and traffic loads. However, a thorough literature review has shown differing opinions on the effect of static and moving traffic loads on buried pipes. Some studies have shown that moving loads produce higher displacement in buried pipes compared to static loads, while other studies have shown contradicting results. These differing opinions have created confusion among researchers who are studying the response of buried pipes under traffic loads, where most of the studies have been conducted using either static or moving loads without proper justification to the selection of the loading type. To clarify this confusion, this paper presents a rigorous study on the behaviour of buried pipes under static and moving traffic loads using a robust finite element analysis. The static and dynamic finite element models have been developed and validated using high-quality field data collected from the literature. The developed models were then used to investigate the effect of the truck speed, pipe stiffness and loading conditions on the maximum displacement of buried pipes. The results showed that the displacement of buried pipes due to static loads is always higher than the pipe displacement due to moving loads. In addition, it was found that the ratio of the static to dynamic pipe displacement decreases as the pipe stiffness increases and increases to a lesser extent as the truck speed increases. Hence, future studies should consider the static loads in designs as these are the most stringent loading condition. This is actually very helpful for designers if they are using numerical methods in their designs, because static analyses are much more straightforward to conduct and less computationally demanding compared to dynamic analyses.
       
  • Predicting the behavior of unbound granular materials under repeated loads
           based on the compact shakedown state
    • Abstract: Publication date: Available online 18 May 2018Source: Transportation GeotechnicsAuthor(s): E. Badakhshan, A. Noorzad, A. Bouazza, Sh. ZameniAbstractThe behavior of unbound granular material under repeated loads primarily depends on the nature and arrangement of constituent particles, particle size and shape. However, very few analytical models are available for predicting the behavior of unbound granular material under repeated loads. This paper presents a generalized failure criterion with a non-associated flow rule which uses from the concept of compact shakedown state for predicting the stress–strain behavior of unbound granular material. At the compact shakedown state, the response of the unbound granular sample to a stress change is reversible and behaves as an elastic material. In an extension to original CANAsand constitutive model, two concepts namely critical state and compact shakedown state play paramount roles as all of the moduli and coefficients are related to these states. In contrast to the critical state, the unbound granular material samples do not experience any plastic deformation at the compact shakedown state and behaves as a purely elastic material and the response to a stress change is reversible. For stress reversal two additional concepts as reflected plastic potential and bounding surface are employed which distinguishes between virgin loading and secondary loading. The extended model is examined by simulating different typical drained tests in conventional tri-axial tests. The applicability of the present model is evaluated through comparisons between the predicted and the measured results.
       
 
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