Effect of SAP on Properties of High Performance Engineered Cementitious Composites

Abstract

Abstract: High shrinkage is one of the bottlenecks limiting the large-scale engineering application of high performance engineered cementitious composites (HP-ECC). This work alleviated the shrinkage of HP-ECC by introducing superabsorbent polymers (SAP). The effects of different amounts of SAP on the compressive strength, flexural strength, tensile properties, autogenous shrinkage and dry shrinkage properties of HP-ECC were investigated. Scanning electron microscopy (SEM) was used to observe the changes in fiber surface morphology after stretching of HP-ECC caused by SAP. The results show that the addition of SAP reduces the compressive strength and flexural strength of HP-ECC and alleviates autogenous shrinkage and dry shrinkage, and the autogenous shrinkage and dry shrinkage decreases with the increase of SAP content. Moreover, SAP reduces the tensile strength of HP-ECC and increases the tensile strain of HP-ECC. The incorporation of SAP reduces the fracture toughness of the matrix, making it more prone to microcracks, thereby improving the strain hardening behavior and multiple cracking of HP-ECC. It is observed that with the increase of SAP content, the surface morphology of the fibers as they are pulled out of the matrix becomes smoother, indicating a decreasing in fiber matrix interface adhesion.

Key words: superabsorbent polymer, high performance engineered cementitious composite, shrinkage property, compressive strength, flexural strength, tensile property

CLC Number:

TU528.01

JIANG Aiguo, YANG Weibin, CAI Jie. Effect of SAP on Properties of High Performance Engineered Cementitious Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(11): 3836-3842.

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