Performance of Recycled Aggregate Concrerte Using Silicate Glass Powder and Mining Powder

Concrete is widely used construction material in the construction industry due to its versatility, durability and economy. The growth rate of urbanization in India is very high due to the rapid industrialization. Hundreds of concrete structures are being constructed on a daily basis. This increases the demand of the raw materials needed for construction i.e. cement, aggregates, sand etc. The increase in the demand leads to depletion of the natural resources and environmental degradation, also this rapid industrialization results in demolition of old concrete structures to build new ones. Using crushed concrete as fill and sub-grade material for roads, sidewalks and foundations is a common practice. However, research has been going on worldwide over the years to investigate the use of crushed concrete from demolished old concrete structures to fully or completely replace the natural aggregates in concrete structures. This present study aims to investigate experimentally the use of recycled aggregates and partial replacement of cement using silicate glass powder and mining powder one at a time as a mineral admixture for abrasion strength in cement concrete. In this study, the cement was partially replaced with silicate glass powder (SGP) and mining powder (MP) at varying proportion (2.5%, 5%, 7.5% and 10%). The replacement of natural coarse aggregate is done with recycled coarse aggregate (RCA) which is fixed at 20 % in all samples to investigate the abrasive resistance. From this study, it was noticed that in silicate glass powder, abrasive strength of recycled aggregates concrete remains almost same till the sample containing 5% of silicate glass. On further increasing the silicate glass content from 5% to 10%, a sudden decrease in the percentage of weight loss was noted. For mining powder abrasive strength of recycled aggregates decreases with the increase in mining powder till 2.5%. On further increasing the amount of mining powder content from 2.5% to 10% gradual decreases in the percentage of weight loss was observed. It was observed that the partial replacement of cement with the silicate glass powder and the mining powder both will increase the abrasive resistance of concrete at varying proportions (2.5%, 5%, 7.5% and 10%).