LABORATORY EVALUATION OF THE PERFORMANCE OF CALCIUM CARBIDE WASTE (HYDRATE LIME) IN CONCRETE
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Date
2018
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WEBSJOURNAL OF SCIENCE AND ENGINEERING APPLICATION
Abstract
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).
Description
Material Engineering
Keywords
calcium carbide waste, hydrated lime, compressive strength, flexural strength, split tensile strength