Constitutive Relationship and Failure Mechanism of Recycled Sand Concrete under Uniaxial Compression

Abstract

To investigate the effect of recycled sand on the compressive properties of recycled coarse aggregate concrete with different strength grades, an experimental study on the stress-strain curve under uniaxial compression was conducted. The failure processes and modes of recycled sand concrete (RSC) were studied, and the peak stress, peak strain, elastic modulus, ultimate strain, and toughness of RSC with different strength grades were studied. The interfacial transition zone (ITZ) of RSC was studied using microhardness and SEM, and its failure mechanism was studied. The results indicate that the addition of recycled sand has a significant impact on the descending segment of the stress-strain curve for the same strength grade. Based on Chinese standards, the relationship between the parameters of the descending segment and the peak stress of RSC was determined. A constitutive relationship for the stress-strain behavior of RSC under uniaxial compression was proposed. The microhardness of the ITZ increases with the decrease in the water-binder ratio and first increases and then decreases with the replacement ratio. This is due to the gelation activity of recycled powder, which reacts with hydration products to fill pores. However, when the content of recycled powder is excessive, the alkaline environment that maintains the stability of the C-S-H gel is disrupted, leading to a decrease in microhardness.

Keywords

recycled sand concrete / replacement ratio / constitutive relationship / microhardness / interfacial transition zone

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