Effect of rice-husk as replacement cement on mechanical properties concrete / Mohd Najmudin Helmi Abu Bakar … [et al.]

The cost of producing concrete has increased, and its effects on the natural environment have become apparent. The ideal solution is to use agro-waste material instead of cement in concrete. This research aims to determine how well RHA works as a cement substitute. At increments of 5%, 10%, and 15%, rice husk was applied in substitute of cement. Compressive and flexural tests were performed on a 100 mm x 100 mm x 100 mm cube and 100 mm x 100 mm x 500 mm prisms with varying percentages of RHA substitution. Findings show that the highest control sample has a compressive strength of 49.83 MPa while t The compressive strength began to drop at 5% RHA substitution. The compressive strength decreased as the percentage of RHA used increased from 10% to 15%. The flexural strength data shows that the 10% RHA has a maximum of 4.90 MPa. The lowest value is 3.85 MPa, and it is only seen from 5% of RHA. Thus, it can be inferred that an RHA replacement level of 5% in cement yields a tremendous increase in compressive strength.