Subjects -> ENVIRONMENTAL STUDIES (Total: 960 journals)
    - ENVIRONMENTAL STUDIES (853 journals)
    - POLLUTION (31 journals)
    - TOXICOLOGY AND ENVIRONMENTAL SAFETY (58 journals)
    - WASTE MANAGEMENT (18 journals)

ENVIRONMENTAL STUDIES (853 journals)                  1 2 3 4 5 | Last

Showing 1 - 200 of 378 Journals sorted alphabetically
ACS Chemical Health & Safety     Hybrid Journal   (Followers: 5)
ACS ES&T Engineering     Hybrid Journal   (Followers: 10)
Acta Brasiliensis     Open Access   (Followers: 3)
Acta Ecologica Sinica     Open Access   (Followers: 11)
Acta Environmentalica Universitatis Comenianae     Open Access   (Followers: 1)
Acta Limnologica Brasiliensia     Open Access   (Followers: 4)
Acta Oecologica     Hybrid Journal   (Followers: 12)
Acta Regionalia et Environmentalica     Open Access   (Followers: 1)
Advanced Electronic Materials     Hybrid Journal   (Followers: 7)
Advanced Energy and Sustainability Research     Open Access   (Followers: 7)
Advanced Sustainable Systems     Hybrid Journal   (Followers: 7)
Advances in Ecological Research     Full-text available via subscription   (Followers: 45)
Advances in Environmental Chemistry     Open Access   (Followers: 11)
Advances in Environmental Sciences - International Journal of the Bioflux Society     Open Access   (Followers: 21)
Advances in Environmental Technology     Open Access   (Followers: 1)
Advances in Life Science and Technology     Open Access   (Followers: 23)
Advances in Tropical Biodiversity and Environmental Sciences     Open Access   (Followers: 5)
Aeolian Research     Hybrid Journal   (Followers: 6)
African Journal of Environmental Science and Technology     Open Access   (Followers: 5)
Agricultura Tecnica     Open Access   (Followers: 5)
Agricultural & Environmental Letters     Open Access   (Followers: 3)
Agro-Science     Full-text available via subscription   (Followers: 3)
Agroecological journal     Open Access  
Agronomy for Sustainable Development     Open Access   (Followers: 22)
Agrosystems, Geosciences & Environment     Open Access   (Followers: 7)
Amazon's Research and Environmental Law     Open Access   (Followers: 5)
Ambiência     Open Access  
Ambiens. Revista Iberoamericana Universitaria en Ambiente, Sociedad y Sustentabilidad     Open Access   (Followers: 1)
Ambiente & sociedade     Open Access   (Followers: 3)
Ambiente & Agua : An Interdisciplinary Journal of Applied Science     Open Access   (Followers: 1)
American Journal of Energy and Environment     Open Access   (Followers: 5)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Environmental Protection     Open Access   (Followers: 9)
American Journal of Environmental Sciences     Open Access   (Followers: 11)
American Naturalist     Full-text available via subscription   (Followers: 85)
Annals of Civil and Environmental Engineering     Open Access   (Followers: 3)
Annals of Environmental Science and Toxicology     Open Access   (Followers: 3)
Annals of GIS     Open Access   (Followers: 29)
Annual Review of Ecology, Evolution, and Systematics     Full-text available via subscription   (Followers: 89)
Annual Review of Environment and Resources     Full-text available via subscription   (Followers: 16)
Annual Review of Pharmacology and Toxicology     Full-text available via subscription   (Followers: 36)
Annual Review of Resource Economics     Full-text available via subscription   (Followers: 10)
Applied and Environmental Soil Science     Open Access   (Followers: 20)
Applied Ecology and Environmental Sciences     Open Access   (Followers: 30)
Applied Environmental Education & Communication     Hybrid Journal   (Followers: 19)
Applied Journal of Environmental Engineering Science     Open Access   (Followers: 2)
Aquatic Ecology     Hybrid Journal   (Followers: 39)
Aquatic Toxicology     Hybrid Journal   (Followers: 25)
Arcada : Revista de conservación del patrimonio cultural     Open Access   (Followers: 2)
Architecture, Civil Engineering, Environment     Open Access   (Followers: 4)
Archives des Maladies Professionnelles et de l'Environnement     Full-text available via subscription  
Archives of Environmental and Occupational Health     Hybrid Journal   (Followers: 12)
Archives of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 14)
Archives of Toxicology     Hybrid Journal   (Followers: 20)
Arctic Environmental Research     Open Access   (Followers: 1)
Asian Journal of Environment & Ecology     Open Access   (Followers: 1)
Asian Journal of Rural Development     Open Access   (Followers: 9)
Asian Review of Environmental and Earth Sciences     Open Access   (Followers: 3)
ATBU Journal of Environmental Technology     Open Access   (Followers: 5)
Atmospheric and Climate Sciences     Open Access   (Followers: 35)
Atmospheric Environment     Hybrid Journal   (Followers: 75)
Atmospheric Environment : X     Open Access   (Followers: 3)
Augm Domus : Revista electrónica del Comité de Medio Ambiente de AUGM     Open Access  
Austral Ecology     Hybrid Journal   (Followers: 18)
Australasian Journal of Environmental Management     Hybrid Journal   (Followers: 13)
Australasian Journal of Human Security     Full-text available via subscription   (Followers: 1)
Australian Journal of Environmental Education     Full-text available via subscription   (Followers: 11)
Basic & Clinical Pharmacology & Toxicology     Hybrid Journal   (Followers: 13)
Basic and Applied Ecology     Hybrid Journal   (Followers: 25)
Behavioral Ecology     Hybrid Journal   (Followers: 60)
Behavioral Ecology and Sociobiology     Hybrid Journal   (Followers: 38)
Biocenosis     Open Access  
Biochar     Hybrid Journal   (Followers: 3)
Biodegradation     Hybrid Journal   (Followers: 2)
Biodiversity     Hybrid Journal   (Followers: 30)
Biofouling: The Journal of Bioadhesion and Biofilm Research     Hybrid Journal   (Followers: 7)
Bioremediation Journal     Hybrid Journal   (Followers: 5)
BioRisk     Open Access   (Followers: 3)
BMC Ecology     Open Access   (Followers: 24)
Boletín Instituto de Derecho Ambiental y de los Recursos Naturales     Open Access  
Boletín Semillas Ambientales     Open Access  
Boston College Environmental Affairs Law Review     Open Access   (Followers: 7)
Bothalia : African Biodiversity & Conservation     Open Access   (Followers: 1)
Built Environment     Full-text available via subscription   (Followers: 5)
Bulletin of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 15)
Bulletin of the American Meteorological Society     Open Access   (Followers: 51)
Bumi Lestari Journal of Environment     Open Access  
Canadian Journal of Earth Sciences     Hybrid Journal   (Followers: 23)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 50)
Canadian Journal of Soil Science     Full-text available via subscription   (Followers: 14)
Canadian Water Resources Journal     Hybrid Journal   (Followers: 20)
Capitalism Nature Socialism     Hybrid Journal   (Followers: 27)
Carbon Resources Conversion     Open Access   (Followers: 3)
Case Studies in Chemical and Environmental Engineering     Open Access   (Followers: 1)
Casopis Slezskeho Zemskeho Muzea - serie A - vedy prirodni     Open Access  
Cell Biology and Toxicology     Hybrid Journal   (Followers: 12)
Chain Reaction     Full-text available via subscription  
Challenges in Sustainability     Open Access   (Followers: 12)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 25)
Chemico-Biological Interactions     Hybrid Journal   (Followers: 3)
Chemosphere     Hybrid Journal   (Followers: 17)
Child and Adolescent Mental Health     Hybrid Journal   (Followers: 72)
China Population, Resources and Environment     Full-text available via subscription   (Followers: 4)
Ciencia, Ambiente y Clima     Open Access   (Followers: 3)
City and Environment Interactions     Open Access   (Followers: 4)
Civil and Environmental Engineering     Open Access   (Followers: 8)
Civil and Environmental Engineering Reports     Open Access   (Followers: 9)
Civil and Environmental Research     Open Access   (Followers: 22)
CLEAN - Soil, Air, Water     Hybrid Journal   (Followers: 21)
Clean Technologies     Open Access   (Followers: 1)
Clean Technologies and Environmental Policy     Hybrid Journal   (Followers: 5)
Cleanroom Technology     Full-text available via subscription   (Followers: 1)
Climate and Energy     Full-text available via subscription   (Followers: 7)
Climate Change Ecology     Open Access  
Climate Change Economics     Hybrid Journal   (Followers: 33)
Climate Policy     Hybrid Journal   (Followers: 51)
Climate Resilience and Sustainability     Open Access   (Followers: 21)
Coastal Engineering Journal     Hybrid Journal   (Followers: 9)
Cogent Environmental Science     Open Access  
Columbia Journal of Environmental Law     Open Access   (Followers: 15)
Computational Ecology and Software     Open Access   (Followers: 11)
Computational Water, Energy, and Environmental Engineering     Open Access   (Followers: 5)
Conservation and Society     Open Access   (Followers: 14)
Conservation Letters     Open Access   (Followers: 51)
Conservation Science     Open Access   (Followers: 29)
Consilience : The Journal of Sustainable Development     Open Access   (Followers: 3)
Contemporary Problems of Ecology     Hybrid Journal   (Followers: 4)
Critical Reviews in Environmental Science and Technology     Hybrid Journal   (Followers: 15)
Critical Reviews in Toxicology     Hybrid Journal   (Followers: 26)
Cuadernos de Investigación Geográfica / Geographical Research Letters     Open Access  
Culture, Agriculture, Food and Environment     Hybrid Journal   (Followers: 25)
Culture, Agriculture, Food and Environment     Hybrid Journal   (Followers: 11)
Current Environmental Engineering     Hybrid Journal  
Current Environmental Health Reports     Hybrid Journal   (Followers: 2)
Current Forestry Reports     Hybrid Journal   (Followers: 1)
Current Landscape Ecology Reports     Hybrid Journal   (Followers: 2)
Current Opinion in Environmental Science & Health     Hybrid Journal   (Followers: 1)
Current Opinion in Environmental Sustainability     Hybrid Journal   (Followers: 17)
Current Research in Ecological and Social Psychology     Open Access  
Current Research in Environmental Sustainability     Open Access   (Followers: 2)
Current Research in Green and Sustainable Chemistry     Open Access   (Followers: 1)
Current Research in Microbiology     Open Access   (Followers: 27)
Current Sustainable/Renewable Energy Reports     Hybrid Journal   (Followers: 9)
Current World Environment     Open Access   (Followers: 7)
Developments in Atmospheric Science     Full-text available via subscription   (Followers: 31)
Developments in Earth and Environmental Sciences     Full-text available via subscription   (Followers: 3)
Developments in Earth Surface Processes     Full-text available via subscription   (Followers: 1)
Developments in Environmental Modelling     Full-text available via subscription   (Followers: 8)
Developments in Environmental Science     Full-text available via subscription   (Followers: 4)
Developments in Integrated Environmental Assessment     Full-text available via subscription   (Followers: 5)
Die Bodenkultur : Journal of Land Management, Food and Environment     Open Access   (Followers: 2)
Disaster Prevention and Management     Hybrid Journal   (Followers: 32)
Discover Sustainability     Open Access   (Followers: 3)
disP - The Planning Review     Hybrid Journal   (Followers: 1)
Divulgación Científica     Open Access   (Followers: 1)
Drug and Chemical Toxicology     Hybrid Journal   (Followers: 16)
Duke Environmental Law & Policy Forum     Open Access   (Followers: 7)
Dynamiques Environnementales     Open Access   (Followers: 1)
E3S Web of Conferences     Open Access   (Followers: 2)
Earth and Environmental Science Transactions of the Royal Society of Edinburgh     Hybrid Journal   (Followers: 6)
Earth Interactions     Open Access   (Followers: 13)
Earth Science Informatics     Hybrid Journal   (Followers: 5)
Earth System Governance     Open Access  
Earth System Science Data (ESSD)     Open Access   (Followers: 8)
Earth Systems and Environment     Hybrid Journal   (Followers: 3)
Earthquake Science     Hybrid Journal   (Followers: 14)
EchoGéo     Open Access  
Eco-Thinking     Open Access   (Followers: 5)
Ecocycles     Open Access   (Followers: 6)
Ecohydrology     Hybrid Journal   (Followers: 11)
Ecohydrology & Hydrobiology     Full-text available via subscription   (Followers: 4)
Ecologia Aplicada     Open Access  
Ecología en Bolivia     Open Access  
Ecological Applications     Full-text available via subscription   (Followers: 214)
Ecological Chemistry and Engineering S     Open Access   (Followers: 4)
Ecological Complexity     Hybrid Journal   (Followers: 7)
Ecological Engineering     Hybrid Journal   (Followers: 4)
Ecological Engineering : X     Open Access  
Ecological Indicators     Hybrid Journal   (Followers: 23)
Ecological Informatics     Hybrid Journal   (Followers: 4)
Ecological Management & Restoration     Hybrid Journal   (Followers: 15)
Ecological Modelling     Hybrid Journal   (Followers: 96)
Ecological Monographs     Full-text available via subscription   (Followers: 39)
Ecological Processes     Open Access   (Followers: 2)
Ecological Questions     Open Access   (Followers: 4)
Ecological Research     Hybrid Journal   (Followers: 12)
Ecological Restoration     Full-text available via subscription   (Followers: 23)
Ecologist, The     Full-text available via subscription   (Followers: 23)
Ecology     Full-text available via subscription   (Followers: 481)
Ecology and Evolution     Open Access   (Followers: 104)
Ecology Letters     Hybrid Journal   (Followers: 341)
EcoMat : Functional Materials for Green Energy and Environment     Open Access   (Followers: 3)
Economics and Policy of Energy and the Environment     Full-text available via subscription   (Followers: 14)
Économie rurale     Open Access   (Followers: 3)
Ecoprint : An International Journal of Ecology     Open Access   (Followers: 6)
Ecopsychology     Hybrid Journal   (Followers: 8)
Ecosphere     Open Access   (Followers: 9)
Ecosystem Services     Hybrid Journal   (Followers: 10)
Ecosystems     Hybrid Journal   (Followers: 33)
Ecosystems and People     Open Access   (Followers: 3)

        1 2 3 4 5 | Last

Similar Journals
Journal Cover
ATBU Journal of Environmental Technology
Number of Followers: 5  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1596-6035
Published by African Journals Online Homepage  [262 journals]
  • Comparative environmental justice among Dutsen Kura Hausa and Dutsen Kura
           Gwari neighbourhoods of Minna, Nigeria

    • Authors: Maikudi Mohammed, Chado Jiman, Kawu Aliyu, J.K. Mohammed
      Pages: 1 - 12
      Abstract: This study compares the environmental justice of Dutsen Kura Hausa and Dutsen Kura Gwari in Minna, Nigeria by identifying and comparing levels and patterns of environmental justice and examining factors behind them. Using Random sampling method in administering 400 questionnaires, Relative Satisfaction Index (RSI) was used in analysing variables in each Environmental Justice dimensions while average RSI was calculated for each dimension. Chi-square test established the variations in the Environmental Justice dimension among the neighbourhoods, identifying cultural and ethnic differences as the highest environmental injustice recorded, where RSI value of 0.86 was obtained for Dutsen Kura Hausa and 0.37 for Dutsen Kura Gwari. P-value of 0.263 at >5% posits statistically significant difference in Environmental Justice dimensions among the neighbourhoods. The study concludes that there is high level of environmental injustice among the two neighbourhoods. Hence, the need to encourage environmental justice advocacy that protects the environment and wellbeing of residents and livelihood of Minna at large.Keywords: Comparative analysis, Environmental justice, Facilities, Pollution, Wellbeing
      PubDate: 2020-01-28
      Issue No: Vol. 12, No. 1 (2020)
       
  • Appraising the environmental friendliness of rice husk ash and oil palm
           shell as building materials from agricultural waste

    • Authors: Usman Aliyu Jalam
      Pages: 13 - 28
      Abstract: The biggest challenge with concrete as the most expensive basic construction material made from cement and aggregate is that of creating a balance between economic constraints and environmental considerations with performance as the focal point. An appraisal of the environmental friendliness of Rice Husk Ash (RHA) and Oil Palm Shell (OPS) as emerging alternative building materials from agricultural waste to supplement and replace conventional cement and coarse aggregates in the production of concrete was conducted in order to guide their appropriate selection and utilisation. The embodied energy accrued during the production of RHA and OPS were assessed and compared with that of Ordinary Portland Cement (OPC) and crushed granite as coarse aggregate. Building Materials Green Feature Assessment criteria of Leadership in Energy and Environmental Design (LEED) was adopted in assessing the green features of both the materials. The appraisal concluded that the production processes and the behaviour of the materials at the construction and post construction stages were found not to have any significant negative impact on the environment in terms of pollution, resources depletion and ecological disturbance. The materials contain less embodied energy than the conventional materials i.e. OPC and coarse aggregate. There is however, the need to develop the necessary appropriate technologies for the local harnessing and utilisation of these emerging materials.Keywords: Rice-Husk-Ash, Oil-Palm-Shell, Green Features, Agricultural Waste
      PubDate: 2020-01-28
      Issue No: Vol. 12, No. 1 (2020)
       
  • Electrical resistivity mapping of aquiferous zones within Gudi-takalau
           Area of Birnin Kebbi, Nigeria

    • Authors: A Adamu
      Pages: 29 - 46
      Abstract: Domestic water supply in Birnin Kebbi metropolis, Kebbi State of Nigeria comes majorly from groundwater. Birnin Kebbi is underlain by the sedimentary rock of Gwandu formation Northwestern, Nigeria. The zone constitutes the easternmost segment of the extensive Sokoto basin. A two-electrode (D.C) electrical resistivity survey was carried out at Gudi-Takalau area of Birnin Kebbi metropolis, Nigeria with the aim of determining the aquiferous zones within the Gudi-Takalau for future borehole drilling. Data obtained from the eleven Vertical Electrical Sounding (VES) station sounded were interpreted using the IPI2win resistivity and surfer V.12 software. An interpretation model was designed by sounding at a borehole site of known lithology log. The interpreted result suggested the existence of two major random geoelectric sections consisting of three to four subsurface layers: the top soil clay (the alluvium cover) with a resistivity range of 20Ωm to 450Ωm and thicknesses range of 3.5m to 10.5m, overlaying the weathered sandstone with a resistivity range of 450Ωm to 3000Ωm at a depth range of 3.5m to 20.4m. Other Sub-layers were identified as weathered, fractured and fresh zones and were also detected and interpreted as aquifers. Finally, regions of high groundwater potentials were identified as VES 04, 01, 09 and 08. A borehole of depth 3.4m to 38.5m is recommended.Keywords: Mapping, Geoelectric Layers, Two-Electrode Resistivity Survey, Fractured and Aquifer
      PubDate: 2020-01-28
      Issue No: Vol. 12, No. 1 (2020)
       
  • Magnitude of transaction costs on contractors for eligibility documents,
           contract administration and bidding

    • Authors: Mohammed Lawal Yahaya, Olukayode Sunday Oyediran, Onukuwbe N. Henry
      Pages: 47 - 78
      Abstract: The research assessed the magnitude of transaction costs incurred by contractors with respect to eligibility papers, contract administration and process costs of bidding expenditures. Multi-stage stratified random sampling method was used to select participants from building companies from two hundred and thirty (230) contractors in chosen North-West states registered in the contractors ' database of the Bureau of Public Procurement, who are deemed to engage in any federal tendering process as participants. Different participants submitted two hundred (200) questionnaires. Modelling of structural equations has been used to evaluate the information from the participants. Results show an important connection existed between the eligibility documents, the process of bidding expenditures, contract administration costs, and the models of procurement guides (PPA 2007). This shows that, when bidding projects, the Transaction Costs (TCs) incurred by contracting companies are between 5-10% of the contract amount. The study proposes that the federal government procurement regulatory body should amend the present PPA 2007 Act in Nigeria. MDAs that are in line with the PPA rules should ask for minimum requirements or criteria.Keywords: Procurement Act 2007, Eligibility document, Contract, Infrastructure, and Transaction costs theory
      PubDate: 2020-01-28
      Issue No: Vol. 12, No. 1 (2020)
       
  • Evaluation of the effect of volcanic ash on the properties of concrete

    • Authors: D Dahiru, M Ibrahim, A.A. Gado
      Pages: 79 - 100
      Abstract: Effect of volcanic ash on the properties of concrete was assessed in the study. Preliminary tests were carried out on the different properties of materials used. The concrete samples were prepared using 0%, 5%, 10%, and 15% volcanic ash replacements and nominal mix of 1:2:4 with a 0.5 w/c ratio. Concrete sample specimen was subjected to workability test. Thereafter, Cube mould of size 100mm x 100mm x100mm and cylinder mould of size 200mm x 100mm were used to cast a total of 405 concrete samples, 162 cubes were used to assess compressive strength test while 162 cylinders were used to determine the tensile strength by the split tensile method. The specimens were cured and tested at 7, 14, 21, 28, 56 and 90 days. The results show setting time and soundness test of Miango volcanic ash satisfied the necessary requirements. Also, increase in compressive strength and split tensile strength of about 7.99% and 6.14% respectively, for concrete samples with 10% volcanic ash replacements after 28days of curing. It was concluded that Miango volcanic ash retards the setting time of concrete and enhances the properties of concrete. Hence it was recommended that it should be used to produce a strong and dense concrete and serve as an admixture.Keywords: Concrete, compressive strength, volcanic ash, partial replacement, workability
      PubDate: 2020-01-28
      Issue No: Vol. 12, No. 1 (2020)
       
  • Enhancement of natural ventilation using solar chimney in hospital
           buildings

    • Authors: Fahad Abdulhamid, Rukayyatu Bashiru Tukur
      Pages: 101 - 116
      Abstract: The study assesses the impact of solar chimneys on natural ventilation in hospitals of hot dry climate region in Nigeria. It takes a quantitative approach using computer simulation software, CFD Ansys Fluent. Input/control data for the software is recorded through a case study of the general hospital, Katsina. A comparison of indoor air velocity and air temperature is made between a base model with and without solar chimneys as indicators of natural ventilation in a selected ward. Result predicts that the application of vertical solar chimney can increase the air velocity up to 0.86 m/s. This shows that, irrespective of the wind velocity outside, the solar chimneys can induce air flow in the building thereby enhancing natural ventilation, which removes unpleasant smells and excessive moisture, introduces fresh air from outside so as to keep interior building air constantly circulated while preventing stagnation.Keywords: Air Temperature, Air Velocity, Natural Ventilation, Solar Chimney, Thermal Comfort
      PubDate: 2020-01-28
      Issue No: Vol. 12, No. 1 (2020)
       
  • Global risk factors affecting performance of construction firms in Abuja,
           Nigeria

    • Authors: A.M. Ibrahim, A.A. Ibrahim, M Abubakar
      Pages: 117 - 141
      Abstract: The study assessed the Global Risk Factors (GRFs) affecting performance of Nigerian construction firms, with a view to identifying the most severe and appropriate risk response techniques. In order to achieve this aim, the severity of GRF across different categories of firms, and the risk response techniques most suitable for each GRF were examined. A total of 105 questionnaires were administered out of which a total of 49 were fully completed and returned. Descriptive statistics was used to analyse the data collected using Likert scales, while Analysis of variance was used to evaluate the similarities/differences in the views of different categories of construction firms. The findings show that most construction firms consider payment delays (mean = 2.65), poor project scope (mean = 2.40) and inadequate design information (mean = 2.39) as the most severe GRF affecting the performance of Nigeria construction firms. It was also discovered that, despite the high likelihood and impact of GRF such as; payment delays, design changes, and inflation/bank Interest rates amongst others, most firms still opted to “accept” them. On the other hand, poor project scopes, strikes, failure to meet clients need and all factors related to unethical practices were “avoided”, while all legal related risk factors were “mitigated”. It is hoped that these findings will help construction firms in developing countries such as Nigeria to be more aware of the effect of GRF in order to be able to assess them effectively before embarking on construction projects.Keywords: Global Risk Factors, Probabiity-Impact Metrix, Negative Risk, Risk Management, Semi-Quantitative Technique
      PubDate: 2020-01-28
      Issue No: Vol. 12, No. 1 (2020)
       
  • Comparative reliability of ultrasonic pulse velocity and rebound hammer
           test methods in assessing compressive strength

    • Authors: D Dahiru
      Pages: 142 - 155
      Abstract: This is an evaluation of the efficacy of the two most popular Non Destructive Testing (NDT) methods – Ultrasonic Pulse Velocity (UPV) and Rebound Hammer (RH) in assessing compressive strength of concrete. 150mmx150mmx150mm concrete cube samples were prepared, cured and subjected to UPV and RH tests at the end of : 1, 3, 7, 14, 21, 28, 56 and 90 days. The same samples were, then subjected to destructive (compressive strength) test. Correlation test, multiple regression analysis, graphs and visual inspection were used to analyze the data obtained. Results indicated increase in rebound hammer from 24 rebounds on the first day to 43 rebounds on the 90th day; while the result of UPV decreases from 43.10 Micro-Sec. on the first day, to 35.90 Micro-Sec. on the 90th day of curing. Regression Model which combines UPV with RH gave the following results: 10.93 N/mm2, 13.99 N/mm2, 25.23 N/mm2 29.72 N/mm2, 33.45 N/mm2, 33.32 N/mm2, 35.45 N/mm2 and 36.75N/mm2 for 1, 3, 14, 21, 28, 56 and 90 curing days, respectively. The conclusion drawn from the analysis, is that combination of rebound hammer and UPV methods is effective in assessing compressive strength of concrete. Hence it is recommended that for more accurate result, rebound hammer should be combined with UPV testing concrete, and that the following formula should be used = 45.80 + 0.88 X -1.31 X . 1 2Keywords: Concrete, Comparative study, compressive strength, rebound hammer, ultrasonic pulse velocity
      PubDate: 2020-01-28
      Issue No: Vol. 12, No. 1 (2020)
       
 
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