Civil & Environmental Engineering- Scholarly Publications

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Browsing Civil & Environmental Engineering- Scholarly Publications by Author "Adeboje, A."

Now showing 1 - 4 of 4
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    Open Access
    Ameliorating Traffic Congestion and Impact on Climate Change with Park and Ride Transport
    (Covenant University, 2017) Rikho, J.; Ndambuki, J.; Kupolati, W.; Adeboje, A.; Kambole, C.
    Traffic congestion occur as more vehicles ply the road and result in reduced travel speed, increased travel time, unnecessary queuing, obstruction on travel path and impediment to traffic flow. Thirteen per cent of greenhouse gases (GHG) emitted are caused by the transportation system which continues to grow. Fume emanating from vehicles contributes greatly to the emission of GHG. Park and Ride was investigated within the Central Business District (CBD) of Tshwane with a view to improving the traffic congestion and reducing the effects of GHG on the climate. Traffic counts and questionnaires distribution were done on the major access routes to the CBD. The quantities of carbon dioxide (CO2) emitted by traffic and that would be reduced when park and ride system is implemented in the City of Tshwane Metropolitan Municipality (CTMM) were determined. Results of traffic volume counts showed high dependence of more than 70% of people on passenger cars as the mode of transit within the study area. It also revealed that almost 89% of the interviewed population are delayed by traffic, on their way to the work place in the morning. Fifty-four per cent of the people interviewed showed readiness to utilize the park and ride facility if their safety and security would be guaranteed. Furthermore the study showed that 96.2% of CO2 emitted could be reduced by the implementation of the park and ride system on the A Re Yeng BRT and also in the major cities of Tshwane.
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    Open Access
    Comparison of technical and short-term environmental characteristics of weathered and fresh blast furnace slag aggregates for road base applications in South Africa
    (Case Studies in Construction Materials - Elsevier, 2019) Kambole, C.; Paige-green, P.; Kupolati, W.K.; Ndambuki, J.M.; Adeboje, A.
    This study investigated chemical, physical-mechanical and environmental characteristics of weathered blast furnace slag (WBFS) and freshly produced slag (FBFS) for their potential utilisation as granular road base and subbase aggregates. The X-ray fluorescence analysis revealed that each material exhibited a strong CaO-SiO2-MgO-Al2O3 chemical system. The X-ray diffraction analysis detected the major mineral phases in WFBS as akermanite, gehlenite and monticellite that accounted for 91.4% of the total mineralogical phase composition. Akermanite and gehlenite accounted for 91% of the total mineralogical phase composition in FBFS. Both slags have weak cementitious properties. The aggregate crushing value, 10% fines aggregate crushing value, flakiness index, plasticity and compaction characteristics of both slag aggregates complied with the South African specifications for crushed stone base and subbase aggregate materials. Soaked California bearing ratio (CBR) values of 153% and 128% for WBFS and FBFS respectively meet the bearing strength requirement for their use in base and subbases. The two materials may also be considered as solid waste with low-risk environmental pollution. Low long term expansion values of 0.32% and 0.39% were observed for WBFS and FBFS respectively. The investigated characteristics indicate that these slags are suitable alternative materials for granular road base construction.
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    Open Access
    Integration of Non-Motorized Transportation to Rosslyn and Ga-Rankuwa Corridor of Tshwane, South Africa
    (Covenant University, 2017-06) Jantjies, M.; Ndambuki, J.; Kupolati, W.; Adeboje, A.; Kambole, C.
    The requirements of sustainable transportation system are safety, affordability, accessibility and convenience. A sustainable transportation system connects various transport modes to enhance efficient movement. It is environmentally friendly and economical. The non-motorized transportation (NMT) may offer safe, efficient, economical and sustainable movements required if integrated with the transportation system. Walking begins and ends trips taken by public and private transportation means. The origin and destination of a journey cannot be completed except NMT is employed. However, NMT as a mode of transportation is yet to be adequately utilized to achieve sustainable transportation in the city of Tshwane. The main aim of this research is to determine the optimal transportation means by integrating NMT into the journey between Ga-Rankuwa and Rosslyn. The travel pattern obtained from trip studies of BMW staff between Rosslyn and Ga-Rankuwa was studied and juxtaposed with the integrated transport plan (ITP) and municipal housing survey (MHS) of Tshwane. A linear programming method called simplex technique was utilized for the determination of trip duration and trip cost from the origin-destination study results. The movement records of the BMW staff was optimized. A sensitivity analysis was conducted on the model and the results were evaluated. The result showed that taxi was the most patronized mode of transportation by the BMW staff between Rosslyn and Ga-Rankuwa corridors. The result also showed that the average trip cost of BMW workers from home to office is R18.47. Integration of cycling as a mode of transportation for short distance trips created 3 more trip patterns. When cycling was integrated to the rail transportation, 36% of the transportation cost was reduced. This work also showed that the subsisting trip method may still be used by less than 45% of the BMW staff while more than 55% of the staff may utilize the integration of cycling and train from home to office and vice versa. This research recommends that similar investigation should be done to other routes of economic importance in the City of Tshwane in order to encourage the integration of cycling into transportation from one place to another.
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    Open Access
    Stabilization of lateritic soil with pulverized palm kernel shell (PPKS) for road construction
    (African Journal of Science, Technology, Innovation and Development - Taylor and Francis, 2017) Adeboje, A.; Kupolati, W.; Sadiku, E.; Ndambuki, J.; Kambole, C.; Ogunleye, O.
    This paper discusses the stabilization of lateritic soil with pulverized palm kernel shell (PPKS), an agricultural waste, for road construction. Samples oflateritic soil with the additionof 5.00–12.50%PPKS at an increment of2.50% were prepared for index and strength tests. The lateritic soil had a liquid limit, plastic limit and plasticity index of 36.00, 26.18 and 9.82% respectively. The control sample with 0% PPKS has low plasticity and may not be liable to shrinkage or cracking. The specific gravity (SG) of the lateritic soil and PPKS are 2.67 and 2.84 respectively. Maximum dry density (MDD) of the lateritic soil increased from 1.76–1.94 kN/m3 for 0–12.50% PPKS. There was a reduction in the optimum moisture content (OMC) of the lateritic soil from 14.69–12.65% for 5–12.50% PPKS. Addition of 12.5% PPKS increased the soaked California bearing ratio (CBR) of lateritic soil by 121% from 24–53%. The unconfined compressive strength (UCS) value increased from 46.69–127.98 kN/m² by 174% for 0–12.50% PPKS. The strength properties of the lateritic soil improved with the addition of PPKS.