The foundry industry has greatly increased in many parts of the world, and their generation of enormous amounts of waste foundry sand is a major environmental concern. Such waste may be classified as hazardous, requiring special precautions for its management, which may include disposal in landfills for hazardous waste. However, this waste can be used as a partial substitute for the sand in a concrete aggregate. Slump flow, water absorption, concrete compression strength, and index void tests were performed to study the properties of fresh and hardened concrete made by substituting 10% and 20% of the sand by weight with foundry sand as concrete aggregate. Image analysis by optical microscopy was also performed in the present study. The results showed that the replacement of the waste foundry sand is technically feasible under the conditions studied and that both the substitutions studied increase the compression strength of the concrete.
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