Properties of Sustainable Concrete Utilization Foundry Sand

Abstract

The reduction of natural sand used in concrete as fine aggregate due to widely concrete usage has led to search for another alternative to sand. The effect of using foundry sand waste to partially replaced sand by weight in concrete has been studied in this paper. Percentages (10%, 20%, 30%, and 40%) of waste foundry sand have been used and the results of workability, dry density, water absorption, compressive strength, split tensile and flexural strength with reference concrete mix that contain natural sand 100% have been compared. The chemical and the physical properties of foundry sand have been examined. Substitute waste foundry sand up to 30% has decreased workability and has increased the density. The 30% replacement has recorded the more increase in compressive and splitting strength of about 25.6% and 17.2% respectively for age 7 days, while 10.7% and 15.6% respectively at age 28 days. Waste foundry sand has been less effective in enhancing the flexural strength than compressive strength. The 40% replacement has showed poor results. The effect of superplasticizer has been studied on 40% waste foundry sand mix. Using superplasticizer 1% of cement weight has recorded increase in compressive and splitting strength of about 9.9% and 4.4% respectively for age 7 days, while 2.8% and 9% % respectively at age 28 days when compared to the reference mix.