Browsing by Author "Adebisi, N. O."

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Assessment of the impacts of building construction activities on the environment
(Department of civil engineering, University of Ibadan, Ibadan, Oyo-state, Nigeria ,department of chemistry, University of Zululand, zululand, kwazulu-Natal, South- Africa. Department of earth sciences, Olabisi Onabaanjo University, Ago-Iwoye, Ogun State, Nigeria. department of applied chemistry, University of Johannesburg, Johannesburg, South Africa. department of civil engineering, Osun State University, Osogbo, Osun state, Nigeria., 2024-04) Akintayo, F. O.; Oyebade, O. N.; Songca, S. P.; Adebisi, N. O.; Oluwafemi, O.S.; Fadipe, O. O.
Activities in building construction industry contribute to air pollution. In this study, gas data from four locations at each three building construction sites in Doha, Qatar were collected and analyzed. Questionnaires were also administered to companies that are involved in building construction projects. The results showed traces of SO2, CO2, CO and NO2 but in amounts below the detrimental limit stipulated by the Ministry of Environment, Qatar. Questionnaire responses revealed that the extraction of raw materials and the energy consumed during construction occur quite often, but strongly implicated dust generated from construction sites and waste disposal, as major factors causing air pollution in the area. It is therefore, recommended that regular monitoring of air should be carried out within building construction sites to aid detection of air contamination. This will serve as a control measure to stimulate catalytic conversion of exhaust, reuse and recycling of waste materials.
Pedo-geotechnical evaluation of subgrade soils along failed Ago-Iwoye/Ilisan road, part of southwestern Nigeria
(Taylor& Francis ltd, 2024-03) Adebisi, N. O.; Ariyo, S. O; Denis, K.; Olufemi, S. T.; Akintayo, F. O.; Oyebolu, O. O.; Frank, A. I
This study utilized the principles of soil mechanics and the physiograph concept to establish pedo-geotechnical patterns of natural soils for the design of pavement structure. A total of 60 disturbed and undisturbed subgrades were sampled from 10 locations at the SB segment, 10 locations through the TZ and 10 locations at the BC end. A series of specific gravity, grain-size distribution, consistency limits, compaction characteristics (unsoaked and soaked CBR) and shear strength parameters were performed. Field observation and test results revealed that the studied area consists of extensive sand, interposed with clayey sand bodies along the SB segment. Also, particles of various sizes at the TZ and heterogeneous sandy clay in the BC segment were noted. Soils from the TZ under soaked conditions have the highest CBR (80.0–88.1%), MDD (19.0–19.1 kN/m3) and the lowest OMC (10.2–10.5%) values. They also have the highest cohesive strength (72.0–80.0 kN/m2) and angle of internal friction (14°−16°). Comparison among properties revealed that soils from the SB area especially, the TZ have much higher subgrade ratings compared to the soils from the BC terrain. The result revealed that the physiography factors affect the performance of the entire pavement structure.
Road conditions and engineering performance of subgrade soils in part of South-Western Nigeria
(IOS Press, 2014, 2014) Adebisi, N. O.; Adeniji, S. A.; Akintayo, F. O.
Studies on subgrade performance and failure of road pavement in parts of Southwestern Nigeria have been carried out. However, an enquiry on native subgrade soils which combines geotechnical data with drainage system in establishing causes of road failure is yet to be made. In a reconnaissance survey, major outcrops, stable and failed (unstable) portions of roads in Ago-Iwoye were identified. Disturbed and undisturbed samples of subgrade soils were obtained by hand auger and U-4 tubes respectively from 18 burrowed pits. Grading, consistency, specific gravity and strength properties of the soils were evaluated through the laboratory, British conventional procedures. For comparison at stable and failed (unstable) sections of the roads, subgrade soils at failed portions of the roads have higher clay (35%) and fines (11%) content with inconsistent plasticity characteristics compared to subgrade soils at stable portions. It is also observed that lower cohesive strength and unsoaked CBR apparently instigated failure of the roads pavements at Ago-Iwoye locality. In addition, the drainage system combined with soils’ moisture-density enhances road failure against the axial loading