Indonesia Conference Directory

The proportion of concrete material affects the strength of concrete. The innovation of a mixture of waste red bricks can be used in concrete. The research method used experiments in the laboratory with normal concrete compressive strength compared to the composition of the mixture of red brick waste in the proportion of 25% and 50% based on SNI. The research objective was to find out the limits of the proportion of the design strength of normal K-200 concrete and by adding red brick waste as a fine aggregate substitute. The results of the use test with 25% and 50% of red brick waste are able to achieve the strength of the plan with reference to a normal concrete comparison so that the material is feasible as a substitute material. The addition of 50% waste is able to reach K-200 but compared to an additional 25%, there is a decrease in strength at 7 days at 16.7%, age 14 days by 20%, and age 24 days at 36.8%. Recommendation for the limit of the proportion of adding red brick waste to 25%.