DefinePK

Abstract

A study on the suitability and effectiveness of machine crushed cow bones (MCCB) as partial replacement of fine aggregates in concrete works was carried out. Mechanical and physical properties of machine crushed cow bones as a partial replacement for locally available fine aggregates have been determined and compared. 36 concrete cubes of 1:2:4 mix design ratio measuring 150x150x150mm with varying percentages by weight of normal concrete aggregates to crushed cow bones as fine aggregate in the order 100:0, 75:25, 65:35, 50:50, 25:75 and 0:100 were cast, cured and tested after 14, 21 and 28 days and their physical and mechanical properties were determined. Compressive strength tests showed that at 25:75 (MCCB:Sand) ratio at 28 days, a strength of 17.6 N/mm2 was achieved at 1:2:4 concrete mi ratio. At 50: 50 (MCCB:Sand) ratio, the compressive strength obtained after 28 days was 16.5 N/mm2. The study has been carried out at 25%, 50%, 65%, 75% and 100% replacement levels of fine aggregate by machine crushed cow bones (MCCB) aggregate by weight and a comparative analysis of the result has been carried out between normal fine aggregate and machine crushed cow bone concrete. The values of the compressive strength at 28 days for replacement levels of (25% - 50%) fine aggregate by MCCB corresponds to values of compressive strength for lightweight concrete (17.6 N/mm2 - 16.5 N/mm2). Aggregate Crushing Value (ACV) for MCCB is 32% and that for fine sand is 17.89%, while Aggregate Impact Values (AIV) for the CCS is 1.22% and that for river san is 11.8%.