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摘要
The early tensile strength and non?uniform deformation of cement mortar containing manufactured sands with different roughness levels were investigated by the 8?shaped tension test and plate?constrained cracking test, combined with digital image correlation (DIC) technique. Based on the Mazars damage model, the equivalent tensile strain in mortar was calculated,and the distribution of non-uniform stress and damage field was statistically characterized. It was found that increasing the roughness of manufactured sand resulted in improved the early tensile strength of the mortar, accompanied by a reduction in overall shrinkage deformation. The damage induced by shrinkage deformation was primarily concentrated around the constrained phase, and propagating towards the mortar from the mortar-constrained phase interface. As the damage neared the interface between the mortar and restraining phase, the severity of the damage escalated. The damage index calculated form the damage area and the equivalent tensile strain in mortar. It was found that when the roughness of the manufactured sand increased to 1.51, the damage index decreased to 0.004 3ε, and the damage area in the interfacial mortar between the restraining phases nearly disappeared, lead to low micro-cracking risk in the mortar. ? 2024 Cailiao Daobaoshe/ Materials Review.
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