Browsing by Author "Tuleun, L.Z."

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    Effect of the Blend of Cement - Sorghum Waste Ash (Sorghum Vulgare) on the Flexural Strength Properties of Concrete
    (Department of Civil Engineering, University of Ilorin, Ilorin, Nigeria, 2018) Tuleun, L.Z.; Jimoh, A.A.
    The continuous depletion of lime stone deposits during cement production is increasingly posing a challenge in the construction industry. Other disadvantage associated with cement production includes CO2 emission into the atmosphere and its negative effect on global warming. As a result, the research was geared towards at proffering alternatives to use of cement with impairing on the overall performance of concrete. Investigating the effect of Sorghum waste ash (SWA) - ordinary Portland cement blends on the flexural strength properties of concrete formed the bases for this study. Ordinary Portland cement was partially replaced with sorghum waste ash at an interval of 5, 10, 15 and 20 %. A water-cement ratio and mix ratio of 0.61 and 1:1.5:3.2 were adopted respectively. Chemical analysis test carried out on the ash sample was done in accordance with ASTM C618 (1999). Sorghum waste ash had silica content of 74 %, which was above the minimum of 50% specified in ASTM C618 (1999) for any material to be classified as a pozzolan. Twenty five beam specimens of size of 100 × 100 × 500 mm were cast and test for flexural strength after 28 days curing period. This was done in accordance with BS EN 12390-1(2000). Validation of experimental results was done using ANSYS 15.1 finite element software. A peak flexural strength of 6.079 N/mm2 was gotten at 10 % cement level with ash. The strength result of plain concrete was 7.304 N/mm2.
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    LABORATORY EVALUATION OF THE PERFORMANCE OF CALCIUM CARBIDE WASTE (HYDRATE LIME) IN CONCRETE
    (WEBSJOURNAL OF SCIENCE AND ENGINEERING APPLICATION, 2018) Tuleun, L.Z.; Jimoh, A.A.
    The disposal of Calcium carbide waste can lead to groundwater contamination via leaching. Also, the production of Portland is increasingly having an effect on global warming and the continuous depletion of limestone deposits. With the aim of minimizing the negative effects associated with the production of cement and disposal of calcium carbide waste, physical and mechanical properties of Calcium carbide waste (CCW) – Ordinary Portland Cement (OPC) in concrete was investigated. Consistency test, initial and final setting time test, compressive, tensile and flexural strength test was carried out on CCW-OPC concrete. OPC was replaced with CCW at 5, 10, 15 and 20 %. A mixed ratio and water-cement ratio of 0.61 and 1: 1.5: 3.2 was adopted for a conventional grade of 20MPa. Eighty five cubes of size of 150 × 150 × 150mm were cast and tested for compressive strength after 7, 14, 28 ,and 56 days curing. Thirty cylindrical specimens of size 100 × 200 were cast and tested for tensile strength after 28 days curing. For flexural strength test, thirty rectangular beam specimens of size 100 × 100 × 500 mm were cast and tested after 28 days curing. Results of initial and final setting time decreased with CCW addition. Results obtained for compressive strength showed a decrement with CCW addition. The optimum compressive strength of 34.3 MPa was obtained at 5 % replacement, which was greater than the strength of plain concrete by 19.9 %. Partial replacement of cement with CCW in concrete led to a decrease in tensile strength. Maximum flexural strength was attained at 15 % cement replacement. A maximum strength of 7.856 MPa obtained was greater the strength of plain concrete (7.304 MPa).
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    Mechanical Properties of Brewers Dried Grain Ash-Hydrated Lime in Concrete
    (Malaysian Journal of Civil Engineering, 2019) Tuleun, L.Z.; Jimoh, A.A.; Wasiu, J
    Ordinary Portland cement (OPC), the world most used binder in concrete production is adjudged a non - environmental friendly material due to the CO2 gas that is emitted into the atmosphere during its production process. Also, with the future generation in mind, limestone resource needs to be adequately preserved and managed. Previous studies on the search for alternative binders had centred mostly on the use of Agro - waste pozzolans in concrete, with little emphasis on the use of the pozzolans with additives that may further enhance reaction in concrete. Hence, this paper explores the possibility of using OPC with brewers dried grain ash-hydrated lime (BDGA-HL) in concrete. Prior to testing for initial and final setting time, compressive, flexural and tensile strength; cubes, beams and cylindrical specimens containing BDGA-HL at 5, 10, 15 and 20 % cement replacement were cast (in a ratio of 1:1.5:3.2 and w/c of 0.61) and cured in water for 7, 14, 28, and 56 days. Based on the findings, a decrease in setting time of the paste was noticed when OPC was partially replaced with BDGA-HL. Also observed was an improvement in flexural and tensile strength up to 10 %; while the maximum compressive strength was attained at 15 %. The results obtained for BDGA-HL concrete were higher than that of plain concrete. It was concluded that BDGA-HL has an excellent pozzolanic potentials improving the properties of concrete
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    Performance of Rice Husk Ash-Calcium Carbide Waste in Concrete. Advanced Materials and Technologies III
    (Trans Tech Publications Ltd, Switzerland . Available online at https://doi.org/10.4028/www.scientific.net/AMR.1155.41, 2019) Tuleun, L.Z.; Jimoh, A.A.; Wasiu, J
    : This paper examines and present the findings of the physical and mechanical properties of concrete containing rice husk ash (RHA), and the blend of rice husk ash with calcium carbide waste (RHA-CCW). Concrete cubes, cylindrical and beam specimens containing different percentages of RHA and RHA-CCW by weight of cement (5, 10, 15 and 20 %) were cast. Compressive strength test was carried out after the specimens were cured in water for 7, 14, 28 and 56 days. Test for tensile and flexural strength was carried out after 28 days curing. Initial and final setting time test was carried out on mortar specimens with the same percentage of RHA and RHA-CCW. Bogues model was used to determine the elemental and compound composition of cement when blended with the RHA and RHA-CCW. From the results obtained, the compressive strength of RHA-CCW concrete increases as cement is partially replaced with RHA-CCW content, with the maximum strength attained at 5 % replacement. RHA concrete attains it maximum strength at 10 % replacement. The maximum compressive strength results obtained for both RHA and RHA-CCW concrete were higher than the strength of plain concrete (0 % replacement) by 1.1 % and 14.7 % respectively. Interestingly, results obtained for the tensile strength also shows a similar pattern of strength development with that of compressive strength. The flexural strength properties of concrete was improved upon when RHA-CCW was used in concrete compared to RHA. The results of setting time test for RHA mortar showed a decrease in setting time, while the reverse was the case for RHA-CCW mortar. In conclusion, provided adequate curing is maintained, the used of RHA-CCW gives a better performance in concrete than RHA. However, they both perform better in concrete than the plain, and can be used as additives in concrete production.