ABSTRACT: Foundry sand is among one of the most produced industrial solid residues in the world. Currently, there are numerous researches around the world about the possible uses for discarded foundry sand, including its use as a substitute for part of the natural sand used in construction. However, the volume of this residue used in different sectors of industry is still small. In this context, understanding that the construction industry presents a great potential for the solution of problems related to the discarded residues generated by other processes by incorporating these materials as building material, this paper seeks to promote the use of FS by reducing the use of Portland cement in the manufacture of cement concrete. To this effect, our experimental program replaced sand for FS and reduced a percentage of the use of Portland cement to determine the characteristics of the materials used and the properties of the cement concrete. Natural sand was partially replaced by foundry sand at the percentages of 5%, 10% and 15%, and the use of Portland cement was reduced by 5%, 10% and 15%. The results showed that de use of FS for Portland cement concrete manufacture is viable. It was concluded that de sample with the reduction of 5% in cement and the substitution of 15% of natural sand for FS presented the best technical, economical and environmental viability.
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