Effectiveness of Glass Powder as a Partial Replacement of Sand in Concrete Mixtures

Concrete is commonly used as the main component in a building. Concrete is obtained by mixing Portland cement, water, aggregates, and sometimes added ingredients at certain comparisons in the form of chemicals, fibrous materials, and non-chemical materials. Utilization of glass powder waste for concrete mixtures is now being developed. This research was conducted to determine the optimum composition of glass powder as a partial replacement of sand against the compressive strength of concrete. The content of the glass powder mixture used is 10%, 15%, 20%, and 30% of the weight of sand in the concrete mixture. Slump test results showed that in the variation of coarse glass powder concrete slump decreased due to lack of bonding capacity between the aggregates. In concrete with a variation of fine glass powder the slump slightly decreases because the fine glass powder absorbs too much water. Concrete compressive strength testing is carried out at 28 days. The results of concrete compressive strength test showed the optimum value can be achieved by 22.8 MPa with 15% variation in glass powder content. The use of glass powder is effective as a substitute for partial sand at 15% of coarse glass powder.