Papers by Idowu Adebakin
Proceedings of International Structural Engineering and Construction
Owode, a sprawling water catchment area better known for its commercial activities in metal and i... more Owode, a sprawling water catchment area better known for its commercial activities in metal and iron casting and fabrication, is located off the Lagos Lagoon and the Ajuwon River, in Lagos State. The extensive iron and steel work along with seasonal flooding of the area and the habits of the people in this area is considered a threat to its groundwater integrity. Samples designated SW1, SW2, and SW3 for stream water WW1, WW2, and WW3 for well water and BH1, BH2, and BH3 for samples collected from boreholes were collected and analyzed to determine the presence of certain physicochemical elements and heavy metals. Including pH, EC, TDS, DO, SO42-, Cl, NO3-, and PO43-. Heavy metals analyzed include Fe, Pb, Zn, Cu, Cr, Cd, and Mn. The findings showed that while a number of parameters when compared with the WHO and NADWQ stipulated maximum acceptable concentration fell within acceptable limits, others especially the heavy metals had trace elevations above the maximum acceptable levels wh...
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Proceedings of International Structural Engineering and Construction
Owode, a sprawling water catchment area better known for its commercial activities in metal and i... more Owode, a sprawling water catchment area better known for its commercial activities in metal and iron casting and fabrication, is located off the Lagos Lagoon and the Ajuwon River, in Lagos State. The extensive iron and steel work along with seasonal flooding of the area and the habits of the people in this area is considered a threat to its groundwater integrity. Samples designated SW1, SW2, and SW3 for stream water WW1, WW2, and WW3 for well water and BH1, BH2, and BH3 for samples collected from boreholes were collected and analyzed to determine the presence of certain physicochemical elements and heavy metals. Including pH, EC, TDS, DO, SO42-, Cl, NO3-, and PO43-. Heavy metals analyzed include Fe, Pb, Zn, Cu, Cr, Cd, and Mn. The findings showed that while a number of parameters when compared with the WHO and NADWQ stipulated maximum acceptable concentration fell within acceptable limits, others especially the heavy metals had trace elevations above the maximum acceptable levels wh...
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ARPN Journal of Engineering and Applied Sciences, 2018
This paper reports result of performance evaluation on self-compacting coconut shell concrete (SC... more This paper reports result of performance evaluation on self-compacting coconut shell concrete (SCCSC) developed using discarded coconut shells as coarse aggregate and partial replacement of ordinary Portland cement with fly ash (FA) at 15% and 20% replacement levels. Tests carried-out on the fresh concrete such as slump flow, T500, V-funnel, L-box and wet sieve segregation resistance confirmed the flowability, consistency and cohesiveness of the developed mixes. On the hardened concrete, mechanical properties tests such as density, elastic modulus, compressive, splitting tensile and flexural strengths were conducted. Furthermore, durability properties of the concrete were evaluated using water absorption, sorptivity, volume of permeable voids and rapid chloride penetration tests. Tests result showed that SCCSC1 mix with 15% FA gave an optimum compressive strength of 21.2 N/mm 2 at 28 days and 25.1 N/mm 2 at 90 days, while SCCSC2 with 20% FA developed compressive strength of 20.1 N/mm 2 at 28 days and 25.5 N/mm 2 at 90 days. Flexural strength, splitting tensile strength and elastic modulus for the mixes are 4.50 N/mm 2 , 2.56 N/mm 2 , 8490 N/mm 2 and 4.00 N/mm 2 , 2.52 N/mm 2 , 7480 N/mm 2 for SCCSC1 and SCCSC2 respectively. Furthermore, tests on durability properties of the developed mixes gave satisfactory results comparable to that of other lightweight concretes.
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ARPN Journal of Engineering and Applied Sciences, 2018
This paper presents report of experimental works on the mix design and fresh properties of self-c... more This paper presents report of experimental works on the mix design and fresh properties of self-compacting lightweight aggregate concrete (SCLWC) blended with fly ash using coconut shell as coarse aggregate. After 35 initial trial mixes, 5 final mixtures were prepared with various amount of cement replacement with fly ash (0-25% by weight of cement) at the same water/binder ratio of 0.33 and same percentage of superplasticizer (1.75% by weight of binder). The fresh properties of SCLWC were investigated by means of slump flow, T 500 , V-funnel, L-box, wet sieve segregation and wet density. Results showed that fly ash blended SCLWC with coconut shell as coarse aggregate performed satisfactorily in flowability, viscosity and passing ability. In particular, mixtures with15% and 20% cement replacement with fly ash gave very good results.
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Sustainability in the construction industry is a global concern, and one way of handling this is ... more Sustainability in the construction industry is a global concern, and one way of handling this is the idea of recycling old concrete rubbles in the production of fresh concrete. Recycled aggregate concrete is normally classified as light weight concrete and recommended for use in production of low-grade non-structural elements. This study examined the properties of crushed old concrete cubes as replacement for natural aggregate. Five specimens 150x150mm concrete cubes with varying percentages of coarse recycled aggregate of 0 %(control), 25, 50, 75 and 100% were prepared. All the mixes were proportioned using the absolute volume method with a targeted compressive strength of 30N/mm 2 and varying w/c ratio. The result shows that with up to 75% replacement of natural aggregate with recycled aggregate, the 28 days compressive strength of concrete is in close proximity with that of normal concrete. While the strength of exclusive recycled aggregate concrete is about 15% lesser than that of exclusive natural aggregate. The result of this research confirms that crushed old concrete cubes can be safely used in the production of high grade concrete.
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Project delivery delay, with its negative ripple effects, is one of the major problems face in th... more Project delivery delay, with its negative ripple effects, is one of the major problems face in the construction industry of developing countries. Delays can be minimized only when their causes are recognized. The main objective of this study is to identify the major causes of delays in construction projects in the Nigeria Construction Industry through a survey. The primary aim is to identify the perceptions of the different parties regarding causes of delays. The literature related the field of causes and effects of delay in construction projects has been reviewed. A questionnaire survey was conducted to solicit the causes of delay from clients, consultants and contractors' viewpoint. This survey was conducted among 10 owners/developers, 40 contractors and 50 consultants. This study identified 41 important causes of delay. It was found the predominant causes of delay are decision during development stage or changes in drawing, drawing approval, delayed payment, market conditions, financial process difficulties or money disbursement, subsurface soil condition, excessive changes in quantities & specifications, design errors or incomplete supply of drawings. The paper forecasts some future trends and suggests certain areas in which future research on construction projects could focus on, the findings of construction management problems are common to developing countries.
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Effect of elevated temperature on the compressive strength of concrete element with recycled aggr... more Effect of elevated temperature on the compressive strength of concrete element with recycled aggregate was investigated. Natural aggregates were replaced with recycled aggregates during casting at 0, 25, 50, 75 & 100 percentages using water cement ratio of 0.60.The natural aggregates used were quarried granites from parent igneous rock with maximum sizes of 19mm. While the recycled aggregates were gotten from demolished old concrete building, crushed manually and sieved to also get maximum sizes of 19mm.Total of 75 concrete cubes of 150mm x 150mm sizes were cast and properly cured for 28 days. The concrete cubes were then subjected to different level of temperatures (50°c, 100°c, 200°c, 300°c, and 400°c) for a period of eight (8) hours in the electronic oven. Test results showed an average of38% reduction in strength for all percentage replacements with recycled aggregates within temperature ranges not above 200°c compare to about 25% reduction in strength of samples with 100% natural aggregates. For temperature ranges between 300°c and 400°c, an average of 55% reduction in strength was observed for samples with various percentage replacements with recycled aggregates.
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Conference Presentations by Idowu Adebakin
Sustainability in the construction industry is a global concern, and one way of handling this is ... more Sustainability in the construction industry is a global concern, and one way of handling this is the idea of recycling old concrete rubbles in the production of fresh concrete. Recycled aggregate concrete is normally classified as light weight concrete and recommended for use in production of low-grade non-structural elements. This study examined the properties of crushed old concrete cubes as replacement for natural aggregate. Five specimens 150x150mm concrete cubes with varying percentages of coarse recycled aggregate of 0 %(control), 25, 50, 75 and 100% were prepared. All the mixes were proportioned using the absolute volume method with a targeted compressive strength of 30N/mm 2 and varying w/c ratio. The result shows that with up to 75% replacement of natural aggregate with recycled aggregate, the 28 days compressive strength of concrete is in close proximity with that of normal concrete. While the strength of exclusive recycled aggregate concrete is about 15% lesser than that of exclusive natural aggregate. The result of this research confirms that crushed old concrete cubes can be safely used in the production of high grade concrete.
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Owode, a sprawling water catchment area better known for its commercial activities in metal and i... more Owode, a sprawling water catchment area better known for its commercial activities in metal and iron casting and fabrication, is located off the Lagos Lagoon and the Ajuwon River, in Lagos State. The extensive iron and steel work along with seasonal flooding of the area and the habits of the people in this area is considered a threat to its groundwater integrity. Samples designated SW1, SW2, and SW3 for stream water WW1, WW2, and WW3 for well water and BH1, BH2, and BH3 for samples collected from boreholes were collected and analyzed to determine the presence of certain physicochemical elements and heavy metals. Including pH, EC, TDS, DO, SO 4 2-, Cl, NO 3-, and PO 4 3-. Heavy metals analyzed include Fe, Pb, Zn, Cu, Cr, Cd, and Mn. The findings showed that while a number of parameters when compared with the WHO and NADWQ stipulated maximum acceptable concentration fell within acceptable limits, others especially the heavy metals had trace elevations above the maximum acceptable levels which if not checked could have serious future groundwater contamination implications.
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Papers by Idowu Adebakin
Conference Presentations by Idowu Adebakin