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硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (8): 2752-2761.DOI: 10.16552/j.cnki.issn1001-1625.2025.0001

• 水泥混凝土 • 上一篇    下一篇

EVA胶粉对超高性能工程水泥基复合材料性能的影响

黄杰1,2, 水中和1,2, 亓习博1,2, 刘家宝1,2, 黄周龙2, 何静2   

  1. 1.武汉理工大学三亚科教创新园,三亚 572000;
    2.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070
  • 收稿日期:2025-01-02 修订日期:2025-03-17 出版日期:2025-08-15 发布日期:2025-08-22
  • 通信作者: 水中和,博士,教授。E-mail:zhshui@whut.edu.cn
  • 作者简介:黄 杰(1998—),男,硕士研究生。主要从事高性能混凝土的研究。E-mail:479070592@qq.com
  • 基金资助:
    三亚崖州湾科技城科技创新项目(SKJC-2023-01-003)

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

HUANG Jie1,2, SHUI Zhonghe1,2, QI Xibo1,2, LIU Jiabao1,2, HUANG Zhoulong2, HE Jing2   

  1. 1. Sanya Science and Education Innovation Park, Wuhan University of Technology, Sanya 572000, China;
    2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China
  • Received:2025-01-02 Revised:2025-03-17 Published:2025-08-15 Online:2025-08-22

摘要: 分别采用低醋酸乙烯(VA)含量的刚性乙烯-醋酸乙烯共聚物(EVA)胶粉、高VA含量的柔性EVA胶粉和以月桂酸乙烯酯为基础的疏水性EVA胶粉对超高性能工程水泥基复合材料(UHPECC)进行改性,分析三种不同类型EVA对UHPECC流动度、抗压强度、抗折强度、抗拉强度、极限拉伸应变、粘结强度、界面抗渗性能、收缩特性、水化程度、孔结构特性和微观特征的影响。结果表明:单掺三种类型EVA后,UHPECC的流动度和抗压强度会降低,但抗折强度、抗拉强度、粘结强度和界面抗渗性能会提升;刚性EVA组在抗折强度、抗拉强度、粘结强度方面表现最好,柔性EVA组在流动度、极限拉伸应变和降低收缩方面表现最好,疏水性EVA在界面抗渗性能方面表现最好;EVA的掺入会降低UHPECC的水化程度,同时降低孔隙率,增强纤维与基体之间的附着力,也会增加UHPECC与普通混凝土界面缺陷处的密实度,进而改善UHPECC的性能。

关键词: EVA胶粉, 超高性能工程水泥基复合材料, 强度, 极限拉伸应变, 粘结强度, 界面抗渗性能

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

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