Publisher: SciELO   (Total: 911 journals)

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Showing 601 - 800 of 911 Journals sorted alphabetically
Revista Chilena de Anatomia     Open Access  
Revista Chilena de Cardiología     Open Access  
Revista Chilena de Cirugía     Open Access   (Followers: 1)
Revista Chilena de Derecho     Open Access   (Followers: 2, SJR: 0.645, CiteScore: 0)
Revista Chilena de Derecho Privado     Open Access   (Followers: 1)
Revista Chilena de Enfermedades Respiratorias     Open Access  
Revista Chilena de Infectología     Open Access   (SJR: 0.202, CiteScore: 0)
Revista Chilena de Literatura     Open Access   (Followers: 2, SJR: 0.16, CiteScore: 0)
Revista Chilena de Neuro-Psiquiatria     Open Access   (SJR: 0.137, CiteScore: 0)
Revista Chilena de Nutricion     Open Access   (Followers: 2, SJR: 0.167, CiteScore: 0)
Revista Chilena de Obstetricia y Ginecologia     Open Access   (Followers: 1, SJR: 0.139, CiteScore: 0)
Revista Chilena de Pediatria     Open Access   (Followers: 1, SJR: 0.171, CiteScore: 0)
Revista Chilena de Radiologia     Open Access   (SJR: 0.124, CiteScore: 0)
Revista Ciência Agronômica     Open Access   (SJR: 0.498, CiteScore: 1)
Revista Ciencia y Cultura     Open Access  
Revista Ciencias Técnicas Agropecuarias     Open Access  
Revista Científica Ciencia Médica     Open Access  
Revista Científica de la UCSA     Open Access  
Revista Científica General José María Córdova     Open Access  
Revista Clínica de Medicina de Familia     Open Access   (Followers: 4)
Revista Clínica de Periodoncia, Implantología y Rehabilitación Oral     Open Access   (Followers: 2)
Revista Colombiana de Anestesiología     Open Access   (Followers: 1, SJR: 0.154, CiteScore: 0)
Revista Colombiana de Antropologia     Open Access   (Followers: 2, SJR: 0.232, CiteScore: 0)
Revista Colombiana de Biotecnología     Open Access   (Followers: 1)
Revista Colombiana de Cancerología     Open Access   (SJR: 0.106, CiteScore: 0)
Revista Colombiana de Cardiologia     Open Access   (SJR: 0.113, CiteScore: 0)
Revista Colombiana de Ciencias Químico-Farmacéuticas     Open Access   (Followers: 1)
Revista Colombiana de Educación     Open Access  
Revista Colombiana de Entomología     Open Access   (Followers: 1, SJR: 0.184, CiteScore: 0)
Revista Colombiana de Estadística     Open Access   (SJR: 0.361, CiteScore: 1)
Revista Colombiana de Matemáticas     Open Access   (Followers: 1, SJR: 0.136, CiteScore: 0)
Revista Colombiana de Psicología     Open Access   (SJR: 0.151, CiteScore: 0)
Revista Colombiana de Química     Open Access   (Followers: 1, SJR: 0.115, CiteScore: 0)
Revista Contabilidade & Finanças     Open Access   (SJR: 0.145, CiteScore: 0)
Revista Costarricense de Cardiología     Open Access  
Revista Costarricense de Psicología     Open Access  
Revista Cubana de Anestesiología y Reanimación     Open Access   (Followers: 1)
Revista Cubana de Angiología y Cirugía Vascular     Open Access  
Revista Cubana de Cirugía     Open Access  
Revista Cubana de Endocrinología     Open Access   (Followers: 1)
Revista Cubana de Enfermería     Open Access   (Followers: 2, SJR: 0.102, CiteScore: 0)
Revista Cubana de Estomatologí­a     Open Access   (SJR: 0.128, CiteScore: 0)
Revista Cubana de Hematología, Inmunología y Hemoterapia     Open Access   (SJR: 0.196, CiteScore: 0)
Revista Cubana de Información en Ciencias de la Salud     Open Access   (SJR: 0.229, CiteScore: 0)
Revista Cubana de Informática Médica     Open Access  
Revista Cubana de Investigaciones Biomédicas     Open Access   (Followers: 1, SJR: 0.13, CiteScore: 0)
Revista Cubana de Medicina     Open Access   (Followers: 2)
Revista Cubana de Medicina General Integral     Open Access   (Followers: 1, SJR: 0.263, CiteScore: 0)
Revista Cubana de Medicina Militar     Open Access   (Followers: 1, SJR: 0.202, CiteScore: 0)
Revista Cubana de Medicina Tropical     Open Access   (SJR: 0.143, CiteScore: 0)
Revista Cubana de Obstetricia y Ginecología     Open Access   (SJR: 0.191, CiteScore: 0)
Revista Cubana de Oftalmología     Open Access   (Followers: 1)
Revista Cubana de Ortopedia y Traumatologí­a     Open Access   (SJR: 0.101, CiteScore: 0)
Revista Cubana de Plantas Medicinales     Open Access   (Followers: 1, SJR: 0.127, CiteScore: 0)
Revista Cubana de Salud Pública     Open Access   (SJR: 0.262, CiteScore: 0)
Revista da Educação Física : UEM     Open Access   (Followers: 1)
Revista da Escola de Enfermagem da USP     Open Access   (Followers: 2, SJR: 0.279, CiteScore: 1)
Revista da Faculdade de Educação     Open Access  
Revista da Sociedade Brasileira de Fonoaudiologia     Open Access  
Revista da Sociedade Brasileira de Medicina Tropical     Open Access   (SJR: 0.658, CiteScore: 1)
Revista de Administração - RAUSP     Open Access   (Followers: 1)
Revista de Administração Contemporânea     Open Access  
Revista de Administração de Empresas     Open Access   (Followers: 1, SJR: 0.16, CiteScore: 0)
Revista de Administração Pública     Open Access   (SJR: 0.294, CiteScore: 0)
Revista de Análisis Económico     Open Access   (SJR: 0.112, CiteScore: 0)
Revista de Antropologia     Open Access   (Followers: 4, SJR: 0.102, CiteScore: 0)
Revista de Bioética y Derecho     Open Access  
Revista de Biología Marina y Oceanografía     Open Access   (SJR: 0.23, CiteScore: 0)
Revista de Biología Tropical     Open Access   (Followers: 1, SJR: 0.326, CiteScore: 1)
Revista de Ciencia Politica     Open Access   (Followers: 2, SJR: 0.368, CiteScore: 1)
Revista de Ciencia y Tecnología     Open Access  
Revista de Ciências Agrárias     Open Access  
Revista de Ciencias Médicas de Pinar del Río     Open Access  
Revista de Ciencias Sociales     Open Access   (Followers: 1)
Revista de Cirugía     Open Access   (SJR: 0.121, CiteScore: 0)
Revista de Derecho     Open Access   (SJR: 0.364, CiteScore: 0)
Revista de Derecho (Concepción)     Open Access   (Followers: 2)
Revista de Derecho (Coquimbo)     Open Access  
Revista de Economía     Open Access   (Followers: 1)
Revista de Economia Contemporânea     Open Access   (SJR: 0.121, CiteScore: 0)
Revista de Economía del Caribe     Open Access  
Revista de Economia e Sociologia Rural     Open Access   (Followers: 2, SJR: 0.265, CiteScore: 0)
Revista de Economía Institucional     Open Access   (SJR: 0.141, CiteScore: 0)
Revista de Economia Poli­tíca     Open Access   (Followers: 1, SJR: 0.282, CiteScore: 0)
Revista de Enfermagem Referência     Open Access   (Followers: 2)
Revista de Estudios Historico-Juridicos     Open Access   (Followers: 1, SJR: 0.123, CiteScore: 0)
Revista de Estudios Sociales     Open Access   (Followers: 2, SJR: 0.166, CiteScore: 0)
Revista de Filosofia     Open Access   (SJR: 0.102, CiteScore: 0)
Revista de Filosofía Open Insight     Open Access  
Revista de Geografía Norte Grande     Open Access   (Followers: 1, SJR: 0.296, CiteScore: 1)
Revista de Gestão Costeira Integrada     Open Access   (SJR: 0.251, CiteScore: 1)
Revista de Historia (Concepción)     Open Access   (Followers: 1)
Revista de Historia del Derecho     Open Access   (Followers: 1)
Revista de Ingeniería     Open Access  
Revista de Investigacion Psicologica     Open Access  
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales     Open Access   (Followers: 1)
Revista de la Asociación Española de Neuropsiquiatría     Open Access  
Revista de la Ciencia del Suelo y Nutricion Vegetal     Open Access   (Followers: 1, SJR: 0.224, CiteScore: 0)
Revista de la Construcción     Open Access   (SJR: 0.234, CiteScore: 1)
Revista de la Facultad de Agronomía     Open Access   (Followers: 3)
Revista de la Facultad de Derecho : Universidad de la República     Open Access  
Revista de la Facultad de Derecho y Ciencias Políticas     Open Access  
Revista de la Facultad de Medicina (México)     Open Access   (Followers: 1)
Revista de la Sociedad Boliviana de Pediatría     Open Access  
Revista de la Sociedad Española de Enfermería Nefrológica     Open Access  
Revista de la Sociedad Química del Perú     Open Access   (Followers: 1)
Revista de la Sociedad Venezolana de Microbiologia     Open Access  
Revista de la Universidad Industrial de Santander. Salud     Open Access  
Revista de Medicina Veterinaria     Open Access  
Revista de Microbiologia     Open Access   (Followers: 1)
Revista de Nutrição     Open Access   (SJR: 0.282, CiteScore: 0)
Revista de Odontologia da UNESP     Open Access  
Revista de Odontologia da Universidade de São Paulo     Open Access  
Revista de Osteoporosis y Metabolismo Mineral     Open Access   (Followers: 2, SJR: 0.121, CiteScore: 0)
Revista de Otorrinolaringología y Cirugía de Cabeza y Cuello     Open Access  
Revista de Protección Vegetal     Open Access  
Revista de Psicología del Trabajo y de las Organizaciones     Open Access   (SJR: 0.418, CiteScore: 1)
Revista de Psiquiatria Clínica     Open Access   (Followers: 1, SJR: 0.271, CiteScore: 1)
Revista de Psiquiatria do Rio Grande do Sul     Open Access   (Followers: 1)
Revista de Salud Animal     Open Access  
Revista de Salud Pública     Open Access   (Followers: 1, SJR: 0.171, CiteScore: 0)
Revista de Saúde Pública     Open Access   (Followers: 1, SJR: 0.807, CiteScore: 2)
Revista de Sociologia e Polí­tica     Open Access   (Followers: 2, SJR: 0.482, CiteScore: 0)
Revista del Instituto de Medicina Tropical     Open Access  
Revista del Nacional     Open Access   (Followers: 1)
Revista Dental Press de Ortodontia e Ortopedia Facial     Open Access   (Followers: 1)
Revista Diacrítica     Open Access  
Revista Direito GV     Open Access   (Followers: 1)
Revista do Colégio Brasileiro de Cirurgiões     Open Access   (SJR: 0.221, CiteScore: 1)
Revista do Departamento de Psicologia. UFF     Open Access  
Revista do Hospital das Clinicas     Open Access  
Revista do Instituto de Estudos Brasileiros     Open Access   (Followers: 1)
Revista do Instituto de Medicina Tropical de São Paulo     Open Access   (SJR: 0.669, CiteScore: 1)
Revista Dor     Open Access  
Revista Ecuatoriana de Neurología     Open Access   (Followers: 1)
Revista EIA     Open Access   (Followers: 1)
Revista electrónica de investigación educativa     Open Access   (Followers: 1, SJR: 0.187, CiteScore: 0)
Revista Electronica Educare     Open Access   (Followers: 2)
Revista Española de Cirugía Oral y Maxilofacial     Open Access   (Followers: 1, SJR: 0.117, CiteScore: 0)
Revista Española de Enfermedades Digestivas     Open Access   (SJR: 0.417, CiteScore: 1)
Revista Española de Salud Pública     Open Access   (SJR: 0.249, CiteScore: 1)
Revista Española de Sanidad Penitenciaria     Open Access   (SJR: 0.135, CiteScore: 0)
Revista Estudos Feministas     Open Access   (SJR: 0.208, CiteScore: 0)
Revista Facultad de Ciencias Económicas: Investigación y Reflexión     Open Access  
Revista Facultad de Ingenieria - Universidad de Tarapaca     Open Access   (Followers: 1)
Revista Facultad de Ingeniería Universidad de Antioquia     Open Access   (Followers: 1, SJR: 0.172, CiteScore: 0)
Revista Facultad de Medicina de la Universidad Nacional de Colombia     Open Access   (SJR: 0.125, CiteScore: 0)
Revista Facultad Nacional de Agronomía, Medellín     Open Access   (SJR: 0.138, CiteScore: 0)
Revista Facultad Nacional de Salud Pública     Open Access   (Followers: 1)
Revista Gaúcha de Enfermagem     Open Access   (SJR: 0.225, CiteScore: 1)
Revista Geológica de América Central     Open Access  
Revista Geológica de Chile     Open Access   (Followers: 1)
Revista Gerencia y Políticas de Salud     Open Access   (SJR: 0.136, CiteScore: 0)
Revista Habanera de Ciencias Médicas     Open Access   (SJR: 0.211, CiteScore: 0)
Revista Historia y Sociedad     Open Access  
Revista IBRACON de Estruturas e Materiais     Open Access   (Followers: 1)
Revista Ingeniería Biomédica     Open Access   (Followers: 1)
Revista Ingenieria de Construcción     Open Access   (Followers: 1, SJR: 0.204, CiteScore: 0)
Revista Ingenierías Universidad de Medellín     Open Access  
Revista Integra Educativa     Open Access  
Revista Interamericana de Bibliotecología     Open Access   (Followers: 7)
Revista Internacional de Contaminación Ambiental     Open Access   (SJR: 0.152, CiteScore: 0)
Revista ION     Open Access  
Revista IUS     Open Access  
Revista Katálysis     Open Access  
Revista Lasallista de Investigación     Open Access   (SJR: 0.146, CiteScore: 0)
Revista Latino-Americana de Enfermagem     Open Access   (SJR: 0.339, CiteScore: 1)
Revista Latinoamericana de Bioética     Open Access  
Revista Latinoamericana de Ciencias Sociales, Niñez y Juventud     Open Access   (Followers: 1)
Revista Latinoamericana de Derecho Social     Open Access   (Followers: 2, SJR: 0.101, CiteScore: 0)
Revista Latinoamericana de Desarrollo Económico     Open Access  
Revista Latinoamericana de Educación Inclusiva     Open Access   (Followers: 1)
Revista Latinoamericana de Filosofía     Open Access   (Followers: 1)
Revista Latinoamericana de Hipertension     Open Access   (SJR: 0.158, CiteScore: 0)
Revista Latinoamericana de Investigación en Matemática Educativa     Open Access   (SJR: 0.171, CiteScore: 0)
Revista Latinoamericana de Psicopatologia Fundamental     Open Access   (SJR: 0.201, CiteScore: 0)
Revista Medica de Chile     Open Access   (SJR: 0.259, CiteScore: 1)
Revista Médica del Hospital Nacional de Niños Dr. Carlos Sáenz Herrera     Open Access   (Followers: 1)
Revista Médica del Uruguay     Open Access  
Revista Médica Electrónica     Open Access  
Revista Médica La Paz     Open Access  
Revista Médico-Científica : Luz y Vida     Open Access  
Revista Mexicana de Análisis de la Conducta     Open Access   (SJR: 0.405, CiteScore: 1)
Revista Mexicana de Astronomía y Astrofísica     Open Access   (Followers: 2, SJR: 0.596, CiteScore: 1)
Revista Mexicana de Biodiversidad     Open Access   (SJR: 0.421, CiteScore: 1)
Revista Mexicana de Ciencias Agrícolas     Open Access   (Followers: 1)
Revista Mexicana de Ciencias Farmaceuticas     Open Access   (Followers: 1)
Revista Mexicana de Ciencias Geológicas     Open Access   (SJR: 0.308, CiteScore: 1)
Revista Mexicana de Ciencias Pecuarias     Open Access   (Followers: 1, SJR: 0.17, CiteScore: 0)
Revista Mexicana de Economía y Finanzas     Open Access   (Followers: 1)
Revista Mexicana de Física     Open Access   (SJR: 0.203, CiteScore: 0)
Revista mexicana de física E     Open Access  
Revista Mexicana de Fitopatología     Open Access  
Revista Mexicana de Ingeniería Biomédica     Open Access   (Followers: 1)
Revista Mexicana de Ingeniería Química     Open Access   (SJR: 0.328, CiteScore: 1)
Revista Mexicana de Investigación Educativa     Open Access   (Followers: 3, SJR: 0.291, CiteScore: 0)
Revista Mexicana de Micologí­a     Open Access  
Revista Mexicana de Sociologí­a     Open Access   (Followers: 9, SJR: 0.142, CiteScore: 0)
Revista Musical Chilena     Open Access   (SJR: 0.1, CiteScore: 0)
Revista MVZ Córdoba     Open Access   (SJR: 0.173, CiteScore: 0)

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Revista de la Construcción
Journal Prestige (SJR): 0.234
Citation Impact (citeScore): 1
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 0717-7925 - ISSN (Online) 0718-915X
Published by SciELO Homepage  [911 journals]
  • 3D-FE of jointed plain concrete pavement over continuum elastic foundation
           to obtain the edge stress

    • Abstract: Abstract The article presents the results of computational modeling of a rigid pavement with load applied to the edge of the slab, for which a multipurpose software (ABAQUS / CAE) based on the finite element method is used. First, it is explained in detail how computational modeling is performed, taking as reference two types of rigid pavements (pavement with and without concrete shoulder). In the process, the main characteristics and hypotheses taken to model the load, the edge conditions and the characteristics of the materials are presented. The mesh density and the finite element type to be used are also analyzed, based on an experimental design. In order to reduce computation times, studies were conducted to make geometric simplifications to the domain. The final solution is contrasted with the Westergaard´s theory and the results of a finite element software already experimentally validated according to the bibliography (EverFE v2.24). Studies of some of the most important factors for pavement designing were conducted. Finally, graphs are shown in specific conditions of geometry and materials, which will serve as practical tools for use in design methods.
       
  • ‘El Palmeral’ apartments in Aguadulce by Fernando Cassinello

    • Abstract: Abstract 'El Palmeral' apartments (1968-1970) located in Aguadulce, a tourist town in Almería, in the Andalusian region of southern Spain are the best work by the architect Fernando Cassinello (Almería, 1928-Madrid, 1975). The urban planning regulations of the development, which required the ground floor to be diaphanous, made possible the original solution of the three great reduced arches with the upper structure of porticos on each block. Hence, the apartments rest on six large arches, producing an image similar to that of an inhabited bridge. Fernando Cassinello, in his dual capacity as professor at the School of Architecture in Madrid and researcher at the Eduardo Torroja Institute of Construction Sciences (IETcc), always positioned himself in the median that unites Architecture and Engineering. In some of his works, an infrastructural derivative can be appreciated. Therein lays the interest of his architectural work. He was able to introduce singular structural aspects, even in private housing projects, both single family and collective. This could be in the way his buildings were related to the ground, or the way he dealt with stairs, which have so often been excluded from the built volume, and which served functions beyond facilitating vertical movement.
       
  • Study of relationship between rework and labor productivity in Building
           Construction Projects

    • Abstract: Abstract The objectives of this study included: (1) identifying the factors affecting construction labor productivity, (2) identifying the causes of rework in building projects, (3) addressing the relationship between labor productivity and rework using regression analysis based on data collected from building projects implemented in Palestine. The following steps were used in this study: (1) Questionnaire survey - stage 1: a questionnaire survey was carried out to identify the main factors affecting labor productivity and the main causes of rework on construction sites, (2) Questionnaire survey - stage 2: after identifying the significant causes of rework using factor analysis, a questionnaire survey was conducted to address the impact of these significant causes on labor productivity, (3) Prediction models: Data collected from 40 building construction projects were used to establish the regression models that describe the relation between rework and labor productivity on construction sites. The study concluded that the top factors affecting labor productivity are: lack of labor experience, payments delay, rework due to labor mistakes, lack of supervisor’s experience and materials shortage. The study also found that the top five rework causes in building projects are: lack of manpower skills, non-compliance with specifications, frequent change orders, inadequate job planning, and inadequate coordination and integration. Using regression analysis for data collected from 40 building construction projects, three predictive models were developed. The models indicated a significant relation between rework cost and labor productivity i.e the higher the rework cost the lower the construction productivity. This study is the first one that investigated the relationship between construction productivity and rework in Palestine, and that is why it is very important. Results would be helpful for researchers and construction professionals.
       
  • An investigation on alkali-activated slag pastes containing quartz powder
           subjected to elevated temperatures

    • Abstract: Abstract In this work, the opportunity of employing crystalline silica in the form of quartz powder (QP) to increase the fire resistance of alkali-activated slag (AAS) has been explored. The ground granulated blast-furnace slag (designated as slag) was partially replaced with QP at levels changed from 5% to 30% with a step of 5%, by weight. After curing for 28 days, the specimens were subjected to elevated temperatures varying from 400 oC to 1000 oC with a step of 200 oC for 2 h. The compressive strength before and after heating was measured. The new formed phases were evaluated by using X-ray diffraction (XRD), whilst the decomposition phases were evaluated by using thermogravimetric (TGA). The changes in the microstructures were monitored by using scanning electron microscopy (SEM). The results showed a positive effect of incorporation of QP, up to 30%, in AAS system before and after exposure to elevated temperatures.
       
  • Rehabilitation of historical ruined castles based on field study and
           laboratory analyses: The case of Bigalı Castle in Turkey

    • Abstract: Abstract The castle structures, which were designed for defense purposes during the period they were built, as a result of the loss of their functions over time, some of them disappear completely, while some of them survive to the present day as a ruin. The rehabilitation of the structures requires a scientific approach and a knowledge of the cultural background to preserve historical identity of the structures. Utilizing these kinds of specific knowledge and the scientific method, the aesthetic and historical values of the structure can be provided. Rehabilitations require an interdisciplinary approach to gain a full understanding of the construction technique and member properties and, also its material characteristics of the structures based on historical documents. In order to restore such structures to their authentic form and prolong their service life, the historical research that started on the date they were built and continued to the present day should be researched, and the material characteristics of the original structural members should be identified. The present study covers the rehabilitation works carried out on a historical ruined castle that was built as a defensive structure in the early 1800s, but has since lost its structural integrity and authentic form. The study is carried out in four stages, beginning with a research of the historical process of the ruined castle, followed by a field study, laboratory analyses and rehabilitation applications. The historical process of the castle was aimed to identify the structural changes that castle has undergone since its construction, while the field study involves a visual examination of the structural defects and the gathering of representative samples from different points of the structure. The laboratory analyses involve mechanical and density tests as well as chemical and mineralogical analyses on the gathered samples. At the last stage, rehabilitation applications were carried out based on the data obtained in the first three stages. In the scope of application works, the joint losses and abrasions to the castle walls was repaired using mixtures formulated through laboratory analyses, and degraded stones was replaced, taking into account their authentic form. Structural cracks were filled following the properties of the original materials. In the completion applications, the abraded and ruptured stones of the castle were completed taking into account the original sizes, types, construction techniques and masonry forms of the stones. As a result of all of the applications, the castle structure was rehabilitated to its authentic situation from ruin, allowing it to survive as an asset of cultural heritage. The study can be deemed important based on its focus on the geometric and material restoration of historical castles that have lost their structural integrity and authentic form, but also in its examination of a defensive structure that was built on the coast of the Aegean Sea in the Dardanelles.
       
  • Effect of curing conditions during the first 24 hours after casting on the
           properties of mortar mixtures

    • Abstract: Abstract As it is well known, the curing method directly affects many properties of cementitious composites. In previous studies, the effect of different curing conditions on the properties of the cementitious systems has been generally investigated in the period after first 24 hours after casting. However, there are not many studies in the literature related to the effects of curing conditions on the specimens kept in mold during 24 hours after casting. In this study, strength development, ultrasonic pulse velocity (UPV) and water absorption capacity of mortar specimens subjected to steam-curing at different temperatures during keeping in mold for the first 24 hours after production were compared. In this regard, all mortar specimens were exposed to curing in a steam-curing cabin at 95% constant relative humidity (RH) under 5 different temperatures such as 20, 35, 50, 65 and 80˚C for the first 24 hours after the specimens were placed into the molds. Afterwards, the specimens were removed from the molds and cured in water conformed to the standard until the testing day. In this context, the water-cement ratio, sand-binder and slump-flow value of all mortar mixtures were kept constant as 0.485, 2.75, 25±2 cm, respectively. As a result, the application of steam-curing at high temperature for the first 24 hours positively affected the 1-day compressive strength and UPV values of the mixtures, while the 3,7 and 28-day compressive strength, UPV values and the 28-day water absorption capacity of mixtures were adversely affected.
       
  • The usability of industrial wastes on soil stabilization

    • Abstract: Abstract Soils are made stronger and more durable by mixing additive materials. In particular, the use of waste provides environmental and economic advantages for this case. Wastes form in large quantities, however, which creates storage problems. To objective of this study is to research the availability of industrial wastes for soil stabilization. An experimental study was conducted on granular soil specimens mixed with industrial wastes such as marble and granite dust, boron waste, and fly ash in different ratios. Each mixture used two waste materials together. Specifically, fly ash was used with three additional waste materials because of its pozzolanic characteristics. The tests performed included freezing-thawing, unconfined compression strength, and California bearing ratio. The results of the study show that the strength of a specimen is dependent on the additive ratio, curing period, and the number of freeze-thaw cycles. Generally, unconfined compressive strength and California bearing ratio increased with additive materials and curing times. After freezing and thawing, unconfined compressive strength (except granite dust) decreased, whereas weight loss increased due to increasing additives and increasing freeze-thaw cycles.
       
  • Optimal design of reinforced concrete beams for rectangular sections with
           straight haunches

    • Abstract: Abstract Objective of this research is to present a mathematical model for optimal design of rectangular cross-section beams with straight haunches under the criterion of minimum cost considering the concrete cost and reinforcing steel cost, and taking into account the equations of the regulation (ACI 318S-14). This model presents the equations for a uniformly distributed load and a concentrated load located anywhere on the beam. Two examples are developed by the proposed model, one for uniformly distributed load and another for concentrated load showing the best solution for each case. The results show the following: a) The prismatic beams for uniformly distributed load have a total cost of the 8% greater, a total volume and a total weight of the 9% greater with respect to the non-prismatic beams; b) The prismatic beams for concentrated load have a total cost, a total volume and a total weight of the 6% greater with respect to the non-prismatic beams. The main conclusions are: For a smaller b width the optimal design for both models is presented. The non-prismatic beams are more economical, also these have less volume and less weight with respect to prismatic beams.
       
  • A comparative study on prediction models for strength properties of LWA
           concrete using artificial neural network

    • Abstract: Abstract In this study, Artificial Neural Network (ANN) model is constructed to predict the compressive strength, split tensile strength and flexural strength of lightweight aggregate concrete made of sintered fly ash aggregate. An empirical relationship between the compressive strength, split tensile strength, and flexural strength was developed and compared with that of experimental results. The models were formulated based on results obtained from laboratory experiments. The variables considered in the study are the quantity of cement and water-cement ratio. Feed forward neural network and Levenberg-Marquardt back propagation algorithm were used for training algorithm in ANN. Amongst the total data, approximately 70% of the data was considered for training, 15% for testing and the remaining 15% has been considered for validation. The developed models had more accuracy with minimum error and had a higher correlation with the correlation coefficients of 0.916 and 0.955 were obtained for the training and testing data of compressive strength prediction, 0.949 and 0.937 respectively for split tensile strength prediction, 0.926 and 0.928 respectively for prediction of flexural strength. The models were compared with the experimental data’s, and the results were discussed.
       
  • Influence of elevated temperatures on compressive and flexural strengths
           of Cocos nucifera Linn. fiber strengthened lightweight foamcrete

    • Abstract: Abstract The call for lightweight foamcrete technology is impelled by the amplified rules and guidelines with the aim of minimizing greenhouse gas emission and reducing carbon footprint. The use of natural fibers in foamcrete is considered as a useful option in making concrete a sustainable material. Therefore, the aim of the present study was to determine the compressive and flexural strengths of foamcrete reinforced with Cocos nucifera Linn. fiber (CNF) exposed to elevated temperatures. CNF refers to agricultural waste or by-products obtained from the distribution of coconut oil and accumulated in a large amount in Malaysia. This study aimed to identify the response of CNF towards six different contents (0.1%, 0.2%, 0.3%, 0.4%, 0.5%, and 0.6%) by mix volume. Three different densities of 650, 1050 and 1450 kg/m3 were tested in this study. The proportion of foamcrete constituted cement, sand, and water which were represented by the ratio of 1:1.5:0.45. Results showed that, CNF-strengthened foamcrete offered progressively ductile structure contrasted with plain foamcrete at elevated temperatures. The incorporation of CNF enhanced the mechanical properties at each predetermined temperature for all densities investigated. This demonstrates that CNF has strong bonding and good quality of chemical properties that are unique to it. The optimum volume fractions of CNF that gave the best improvement in mechanical and high temperature properties were 0.3% for 650 kg/m3, 0.4% for 1050 kg/m3 and 0.5% for 1450 kg/m3.
       
  • An investigation of resistance of sodium meta silicate activated slag
           mortar to acidic and basic mediums

    • Abstract: Abstract This study presents the resistance of sodium meta-silicate activated ground granulated blast furnace slag (GGBFS) to acidic and basic mediums. Geopolymer mortars were prepared with GGBFS activated by sodium meta-silicate activator having 4, 8, and 12% sodium concentrations by mass of slag. These mortars were exposed to two types of acid solutions, H2SO4 and HCl with a 5% concentration of acid-water solution. Similarly, some specimens were exposed to a basic medium composed of 25% NaOH solution with water. Exposure time for the acidic and basic mediums was set to one year. Comparison of results obtained from slag based geopolymer mortar was made with normal Portland cement control mortar. Normal control samples lost compressive strength significantly after exposure to acidic and basic medium in comparison to alkali activated slag mortar. Particularly, after exposure to H2SO4, the compressive strength of the normal control samples decreased by about 40%. Contrary to this, the slag based geopolymer mortar gained compressive strength after exposure to the acidic or basic mediums. An up to 21% strength increase was observed from the alkali activated slag mixtures made with 4% and 8% Na content.
       
  • Earthquake hazard estimation for road tunnel in Northwest Himalayas

    • Abstract: Abstract Seismic hazard assessment of earthquake prone terrain is estimated in numerous ways for civil underground structures such as tunnels which receives little attention on the seismic zones of the country. The resemblance of the past behaviour of earthquake is seen in the present seismotectonic block, and this is considered for this study. With this, the magnitudes of future earthquakes and its effects are predicted with Matlab software. In order to emphasize the need for carrying out a detailed Seismic Hazard analysis in underground openings, a proposed communication (road) tunnel project located in Kashmir Himalayas (GPS coordinates of Latitude 32.20° to 37.20° N, Longitude 72.50° to 80.50° E) one of the highest seismic zones of the Country (zone-V, BIS-2002) was taken up and the results reported in the paper. The paper incidentally has brought to light the need for carrying out such detailed seismic analyses in a routine manner for underground structures to be constructed in the country particularly in higher seismic zones, besides adumbrating structural support measures required for the various ground classes in the proposed road tunnel at Kashmir in response to seismic loading and also recommending retrofitting for other structures already in existence. A spin off the study is expected to be in the area of refining seismic zonation of the country and micro-zonation studies that are slated for the future.
       
  • Extrinsic factors influencing the bid/no-bid decision of construction
           contracting firms: Impact of firm size and experience

    • Abstract: Abstract Construction contracting firms (CCFs) are functioning in a highly volatile and competitive industrial environment making it imperative to bid for the projects that can produce the most return and market share. The decision making process to bid or not is based on various factors that vary from project to project and firm to firm. The aim of this work is to analyze the impact of firm size and experience on extrinsic factors influencing the bid/no-bid decision for construction projects. The questionnaire was pilot tested and designed in three parts. The final questionnaire was sent to 300 CCFs registered with Pakistan Engineering Council (PEC) and respondents were asked to rate the factors on a Likert scale. Out of 300 questionnaires, 167 completed responses are returned representing a response rate of 56%. The collected data are then analyzed using Mann-Whitney U test through Statistical Package for Social Sciences (SPSS). Findings show the various degrees of differences between small and large, and young and mature CCFs with regard to factors influencing the bid/no-bid decision. Small firms need to overcome increasing market value and number of competitors in the market. They need to develop relationship with government officials in order to secure their bids. Mature firms need to review the payment practices of clients, politician pressure and business level of the client before entering into the bid. Availability of required material and skilled labor are of prime importance for the mature firms’ success.
       
  • Influence of the molding process and different surface regularization
           methods on the compressive strength of concrete specimens

    • Abstract: Abstract Concrete is one of the most important material for civil construction, given its high applicability. C Compressive strength (fc) is one of the main parameters to evaluate the concrete quality. Concrete of the same mixing volume may vary even with the same materials preparation. Concrete specimens molding, and its surface regularization contribute to these variations that are often hard to measure. Therefore, this paper aims to determine the variations in compressive strength of concrete, simulating different processes for casting, initial curing and surface treatment. In stage 1, the specimens were subjected to five surface treatment types, resulting in variations of 30% for concrete fc, whereas grinding specimens reached the highest 28-day compressive strength, so they were carried over to the next stage. In stage 2, specimens were produced as per ABNT NBR 5738 (2015) and with induced errors in casting and initial curing. The specimen produced according to the standard achieved the second-best result, whose 28-day fc was3% lower than that of the similar method, despite leaving the specimen uncovered for the first 24 hours after casting. Specimens produced in metal cylinder form works shows higher results than those produced in polyvinyl chloride molds (PVC).
       
  • Mechanical characterization of Raw-Perlite Solid Bricks for use in
           construction

    • Abstract: Abstract In San Antonio de los Cobres located to the west of Salta, Argentine, the residents resort to the use of Adobe bricks to build their houses. Such masonry is made by the residents themselves using old building techniques whose principal material is clay. At present, this material turns out to be scarce in the region due to the growing demand. On the other hand, in the vicinity of the town, there are mining plants which extract perlite generating wastes of particles smaller than 150 microns. With a high-content of residues (70% by weight), raw solid bricks are elaborated with a CINVA-Ram compacting unit. The aim of the present research work is to analyze the possibility of replacing Adobe bricks with these new bricks. Such analyses will follow tests which comply with IRAM standards (official national standards body for the Republic of Argentine), such as compression and flexion strength, absorption, capillary absorption and thermal conductivity tests. In conclusion, our results indicated that raw-perlite brick studied had better physical properties than the Adobe bricks.
       
 
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