Evaluation of Concrete Strength Parameters with Variations in Aggregate Gradation, with Emphasis on Non-Destructive Methods

Document Type : Research Paper

Authors

1 Engineering geology Department, University of Tehran

2 University of Qom; Civil Engineering Department

10.22124/jcr.2026.28214.1670

Abstract

Destructive (direct) testing methods are among the most common approaches for determining the strength parameters of concrete. In addition to causing damage to the concrete, these methods are associated with relatively high costs. Under such circumstances, the application of non-destructive (indirect) testing methods can provide a more efficient and economical alternative. In the present study, destructive tests including uniaxial compressive strength, Brazilian tensile strength, and point load index, as well as non-destructive tests including the Schmidt hammer test and ultrasonic pulse velocity (UPV), were performed on three different concrete mix designs. The only difference among these mix designs was the aggregate gradation. The obtained results were then comparatively analyzed, and correlation relationships between the results of destructive and non-destructive methods were developed. The results indicated that variations in aggregate gradation have a significant effect on the mechanical strength parameters of concrete. Specifically, excessive use of coarse aggregates and the resulting very coarse gradation in the concrete mix design negatively affects the strength characteristics of concrete.

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References

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