Effect of EVA Latex on Properties of Ultra-High Performance  Engineered Cementitious Composites

doi:10.16552/j.cnki.issn1001-1625.2025.0001

Abstract

Abstract: The ultra-high performance engineered cementitious composites (UHPECC) were modified respectively by using stiff ethylene-vinyl acetate copolymer (EVA) powder with low vinyl acetate (VA) content, flexible EVA powder with high VA content and hydrophobic EVA powder based on vinyl laurate ester. The effects of three different types of EVA on the fluidity, compressive strength, flexural strength, tensile strength, ultimate tensile strain, bonding strength, interfacial impermeability, shrinkage characteristics, hydration degree, pore structure characteristics, and microscopic features of UHPECC were analyzed. The results show that the incorporation of all three types of EVA will reduce the fluidity and compressive strength of UHPECC, but will enhance the flexural strength, tensile strength, bonding strength, and interfacial impermeability of UHPECC. The stiff EVA group performs best in terms of flexural strength, tensile strength, and bonding strength. The flexible EVA group performs best in terms of fluidity, ultimate tensile strain, and shrinkage reduction. The hydrophobic EVA performs best in terms of interfacial impermeability. The incorporation of EVA will reduce the hydration degree of UHPECC, decrease the porosity, enhance the adhesion between the fibers and the matrix, and also increase the compactness at the interface defects between UHPECC and ordinary concrete, thereby improving the performance of UHPECC.

Key words: EVA latex, ultra-high performance engineered cementitious composite, strength, ultimate tensile strain, bonding strength, interfacial impermeability

CLC Number:

TU528

HUANG Jie, SHUI Zhonghe, QI Xibo, LIU Jiabao, HUANG Zhoulong, HE Jing. Effect of EVA Latex on Properties of Ultra-High Performance Engineered Cementitious Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(8): 2752-2761.

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Effect of EVA Latex on Properties of Ultra-High Performance Engineered Cementitious Composites

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