a study on the mechanical properties of concrete containing recycled aggregate and lightweight expanded clay aggregate

Document Type : Research Paper

Authors

Department of Civil Engineering, Ram.C., Islamic Azad University, Ramsar, Iran.

10.22124/jcr.2025.29033.1685

Abstract

This study studied both the separate and combined effects of lightweight expanded clay aggregate (LECA) and recycled aggregate on the mechanical properties of concrete.

For this purpose, three basic mixtures with target strengths of 40, 70 and 100 MPa were designed.

At each base mixture, natural coarse aggregate was substituted with recycled coarse aggregate in proportions of 50% and 100% and LECA in proportions of 25% and 50% to develop three groups of mixtures, totaling 18 mixtures. The prepared samples were tested to determine compressive, splitting, shear strengths and elastic modulus after curing for 28 days. The results showed that replacing natural coarse aggregate with recycled coarse aggregate and LECA separately reduced the compressive strength by 26.2% and 34.1% compared to the base mix, respectively. Also, the decrease in compressive strength resulting from the simultaneous use of recycled coarse aggregate and LECA was significantly greater than the separate replacement of natural coarse aggregate with these materials, which was more observed in low-strength mixtures. the splitting strength, shear strength, and elastic modulus results in various mixtures showed a similar trend to compressive strength, meaning that these characteristics significantly decrease as natural coarse aggregate was replaced by recycled coarse aggregate and LECA, although the reducing effect of simultaneous use of recycled coarse aggregate and LECA was small. Furthermore, relationships were established between the square root of the compressive strength and the splitting strength, shear strength, and elastic modulus for different mixtures.

Keywords

Main Subjects

References

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