Civil & Environmental Engineering- Scholarly Publications

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Browsing Civil & Environmental Engineering- Scholarly Publications by Author "Adedokun S.I."

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  • Item
    Open Access
    Effect of Synthetic Hair Fibre Additions on the Strength Characteristics of Concrete
    (Department of Civil Engineering, Unilorin, Nigeria, 2016) Adedokun S.I.; Ajamu S.O.; Aderinto H.T.
    Extensive research has been carried out on the use of different kinds of fibres to improve the characteristics of construction materials. However, literature is scarce on the use of synthetic hair fibre for similar purposes. In this study, effect of synthetic hair fibre addition on the strength of concrete was examined. The synthetic hair fibres were added to the concrete in various percentages by mass of cement from 0% to 6% in intervals of 2%. The impacts of the fibre addition on the workability of concrete were investigated through slump and compacting factor tests. The compressive strength, split tensile strength and density tests were also conducted on each of the test specimens after 7, 14, 21 and 28 days curing, respectively. The results obtained from both the slump and compacting factor tests showed that the workability increased with the addition of fibres with compacting factor and slump increasing from 0.86 to 0.9 and 17 to 25 mm respectively. The fibre additions also increased the compressive and split tensile strengths with increasing days of curing from 0% to 2% but decreased for higher hair fibre contents with days of curing. It was also observed from the results that the density of concrete at 28days decreased with increase in hair contents. Based on this study, addition of 2% hair fibre by weight of the cement is therefore recommended as the optimum value for improving the compressive and tensile strength of the concrete.
  • Item
    Open Access
    Geochemical Analysis of Ilaro-Papalanto Highway Subgrade
    (Department of Civil Engineering, LAUTECH, Ogbomoso, 2020) Apata A.C.; Adedokun S.I.
    In this study, the geochemical analysis of the subgrade at different locations of Ilaro-Papalanto highway was conducted using Atomic Absorption Spectrometry (AAS) and X-Ray Diffractometry (XRD). The predominant oxides present in both soil samples are Silicon Oxide (40% - 45%) and Aluminium Oxide (31% - 34%), and the average silica content of Ilaro and Papalanto are 45.71% and 40.71% respectively, which implies that Ilaro soil sample is more chemically inert and structurally stable than Papalanto soil samples. The average sesquioxide content of Papalanto (36.27%) is higher than that of Ilaro (32.87%), while the silica sesquioxide ratio (SSR) of Papalanto (1.12%) is less than that of Ilaro (1.39%), therefore both soil samples are in advanced stage of weathering but Papalanto soil is more lateritic than Ilaro. Geochemical analysis using XRD indicated the presence of three clay minerals (Kaolinite, Illite and traces of Montmorrrilonite) and one major non-clay mineral, Quartz. The average proportion of Kaolinite in the soil samples are 9% (Ilaro) and 28% (Papalanto), but the average values of Quartz are 62% and 69% for Ilaro and Papalanto, respectively. The higher proportion of sesquioxide and Kaolinite from Papalanto samples is an indication of more failures observed in the region.