Tensile Properties of PP/PVA Hybrid Fiber Engineered Cementitious Composites Reinforced by SMAF

Abstract

Abstract: A new type of composite material SMAF reinforced ECC (SMAF-ECC) with high ductility and self-recovery performance can be prepared by incorporating superelastic shape memory alloy fiber (SMAF) into high ductility engineered cementitious composites (ECC). Due to the high price of polyvinyl alcohol (PVA) fiber raw materials used in the preparation of ECC, this paper used relatively low-cost polypropylene (PP) fiber to partially replace PVA fiber to prepare PP/PVA hybrid fiber ECC. SMAF was added to prepare PP/PVA hybrid fiber ECC reinforced by SMAF, so as to reduce the cost of composite materials. In order to explore whether the low-cost SMAF-ECC still had good mechanical properties, the tensile properties of SMAF-ECC with different SMAF content and diameter were studied by uniaxial tensile test. The results show that the content and diameter of SMAF have a significant effect on the tensile properties of SMAF-ECC. The SMAF-ECC specimens with a diameter of 0.2 mm and a content of 0.2% (volume fraction) show the optimal tensile properties, with an increase of 16.79% in the initial cracking stress, and an increase in the ultimate tensile stress and strain of 20.85% and 2.87%, respectively, in comparison with the ECC specimens.

Key words: engineered cementitious composites, polypropylene fiber, shape memory alloy fiber, fiber reinforced, superelasticity, tensile property

CLC Number:

TU352.1

FAN Lin, YANG Zhao, QI Xiaolong, DENG Fangqian. Tensile Properties of PP/PVA Hybrid Fiber Engineered Cementitious Composites Reinforced by SMAF[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(3): 811-820.

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