Mechanical Properties of Concrete Utilizing Metakaolin - Cement Coated Recycled Aggregates
DOI:
https://doi.org/10.65568/gujes.2026.020113الكلمات المفتاحية:
Recycled aggregates، Coating ، Replacement level، Compressive Strength، Splitting، Tensile Strengthالملخص
Research supports using recycled concrete aggregates (RCA) as an economical and eco-friendly substitute for natural aggregates (NA) in concrete. However, RCA's higher water absorption reduces its engineering performance compared to NA. To address this, pretreatment methods like thermal, mechanical, and chemical processes have been proposed. This study specifically tested the effect of metakaolin - cement coated recycled aggregates on the compressive and tensile strength of concrete where RCA replaced 10-20 mm natural coarse aggregate at levels of 0, 20, 30, 40, 50, and 100% (by weight). Results showed that while RCA addition generally reduces concrete strength, coating the aggregates mitigates this effect. Notably, concrete with 100% coated RCA showed compressive and tensile strength improvements of approximately 7.5% and 7.7%, respectively, compared to concrete with 100% untreated RCA.
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