Effect of Superabsorbent Polymer on Properties of Engineered Cementitious Composites

Abstract

Abstract: Superabsorbent polymer (SAP) was added into engineered cementitious composites (ECC) slurry through two methods of non-soaked mixing and pre-soaked mixing, and the effects of SAP on the ultimate tensile strain, tensile strength, restrained shrinkage and toughness of ECC under different dosages and mixing methods were analyzed. The results show that non-soaked mixing significantly enhances the plastic viscosity and reduces the flowability of ECC slurry upon SAP addition. Conversely, the pre-soaked mixing method decreases plastic viscosity and improves flowability, facilitating the molding process of ECC slurry. The addition of SAP to ECC through the non-soaked mixing method exhibits higher initial cracking strength and tensile strength, along with better toughness. The addition of SAP to ECC through the pre-soaked mixing method results in increased ultimate tensile strain in ECC and a more effective improvement in the performance of shrinkage restraint. SAP significantly enhances the tensile strain capacity and toughness of ECC specimens. All ECC specimens with SAP exhibit favorable ductility, with ultimate tensile strain exceeding 3%. Compared to the control group, the ultimate tensile strain of ECC with SAP has increased by 62.0% to 99.0%.

Key words: engineered cementitious composite, superabsorbent polymer, mixing method, ultimate tensile strain, flexural deflection, restrained shrinkage, plastic viscosity

CLC Number:

TU525.9

LIU Jiabao, SHUI Zhonghe, QI Xibo, LI Shixiang, XIAO Xunguang. Effect of Superabsorbent Polymer on Properties of Engineered Cementitious Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(12): 4224-4232.

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