| 1 |
Author(s):
Adesanya Oluwafemi Atilade, Joseph Olakunle Coker, Tajudeen Adeniyi Akinpelu, Semiu Adeniran Oshinlaja.
Page No : 1-10
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Geophysical and Geotechnical Assessment of Sub-Grade Condition along Proposed Roads at Lagos State University of Science and Technology, Ikorodu, South-West Nigeria.
Abstract
In most parts of the world, road failure has contributed to major problems leading to the death of so many people, causing traffic hazards, accidents and also increasing the rate of damage to vehicles. This research is to assess the geophysical and geotechnical conditions of proposed roads to be constructed in the Lagos State University of Science and Technology, Ikorodu, South-West, Nigeria. To achieve this, Electrical resistivity tomography (ERT) at 5 m spacing and Dynamic Cone Penetration Test (DCPT) at intervals of 50 m were deployed on five (5) profiles of 250 m each. The results show that the California Bearing Ratio (CBR) values calculated from DCPT range from 1.67% to 98.71% revealing very poor to excellent base/sub-grade material while the electrical resistivity tomography shows that the resistivity values ranges from 113.5 to 1266 Ωm revealing subsurface signatures of incompetent sandy clay, fairly competent sandy clay, fairly competent clayey sand and competent sand/dry sand materials. The areas of incompetence can be evacuated and compacted to facilitate better and more durable road constructions in the study area.
| 2 |
Author(s):
M. A. Abdulqadir, A. I. Muhammad, A. Bomai, A. U. Lame.
Page No : 11-21
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Criteria for Public Green Building Design in Savannah Area: A Case Study of Bauchi Metropolis Fitness Centers.
Abstract
Green construction methods and buildings have emerged as a major trend that is here to stay. Green buildings are becoming commonplace, from eco-friendly residential construction to multibillion-dollar business projects. As a result, eco-friendly structures generate less waste, greenhouse gas emissions, and natural resource consumption. In order to reduce architectural disability and increase diversity in the built environment, the seven main universal design principles improve the wide usage of places. The goal of the study is to examine several standards that should be used when creating a well-designed structure that can provide a standard and safe environment for activities. To enable research triangulation and a broad range of data collecting, a qualitative research approach was employed for the study. Interviews, visual surveys, and observation of the relevant case studies chosen for the study are among the data collection tools employed in this investigation. The study discovered that in all of the chosen cases examined, there is a limited application of general universal design principles, which makes the structures unmarketable. Additionally, it was discovered that none of the chosen case studies contained any unique or specialized buildings that sufficiently satisfied the architectural specifications of an eco-friendly structure. As a result, the study specified standards to be applied in the planning and development of an environmentally friendly, sustainable structure.
| 3 |
Author(s):
Ibe Olughu Kalu, Nnaji Godwin Uche, Uzoma Kingsley Chinyere, Amanze Chikamnele Tochukwu.
Page No : 22-34
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Soil Organic Carbon Sequestration Under Tree Cropland at Varying Parent Materials and Depths in Southeastern Nigeria: A Geospatial Perspective.
Abstract
Knowledge of carbon storage in soils across varying parent materials and depths under tree crop vegetation is essential for mitigating global carbon emissions. This study evaluated the geospatial pattern of the soil organic carbon (SOC) pool. The experiment was a two-factor factorial arranged in a randomized complete block design (RCBD). The factors consisted of soil depth at three levels (0–19, 20–39, and 40–100 cm) and parent material at five levels: Coastal Plain Sands (CPS), Shale (SHL), Imo Clay Shale (ICS), Sombreiro–Warri Deltaic Formation (SDD), and Mangrove Swamp Deposit (MSD). Three replicates of core and auger soil samples were randomly collected at the respective depths in each study location. Kriging interpolation was employed for the geospatial assessment of the SOC pool, while analysis of variance (ANOVA) was performed on the data. Significant means were separated using Fisher’s Least Significant Difference (LSD) test at the 5% probability level. The results showed that soils derived from CPS had the highest (P ≤ 0.05) SOC pool (575.80 Mg C ha⁻¹), followed by those from ICS across the soil depths. The overall trend in carbon sequestration was CPS > ICS > SHL > MSD > SDD. Semi-variogram models and their parameters indicated that the SOC pool varied spatially within and across locations. The findings demonstrate that parent material significantly influences soil organic carbon storage, and that SOC varies considerably even among soils developed from the same parent material. Therefore, site-specific soil management practices should be adopted for different soils and regions to promote sustainable agriculture and environmental conservation.
