VAE乳胶粉改性水泥砂浆的配合比优化及抗冻性研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (10): 3462-3469.

VAE乳胶粉改性水泥砂浆的配合比优化及抗冻性研究

王晓林¹, 冯红春², 周凯³

1.太原学院建筑与环境工程系,太原 030032;
2.长江勘测规划设计研究责任有限公司,武汉 430010;
3.太原理工大学土木工程学院,太原 030024

收稿日期:2023-06-27 修订日期:2023-07-24 出版日期:2023-10-15 发布日期:2023-10-17
作者简介:王晓林(1988—),女,讲师。主要从事土木工程材料、土木工程专业教学改革的研究。E-mail:wangxiaolintyxy@163.com
基金资助:
山西省高等学校教学改革创新项目(J2021773);太原学院院级科研项目(21TYKQ17)

Mix Ratio Optimization and Frost Resistance of VAE Latex Powder Modified Cement Mortar

WANG Xiaolin¹, FENG Hongchun², ZHOU Kai³

1. Department of Architecture and Environmental Engineering, Taiyuan University, Taiyuan 030032, China;
2. Yangtze River Survey, Plainning, Design and Research Co., Ltd., Wuhan 430010, China;
3. School of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Received:2023-06-27 Revised:2023-07-24 Online:2023-10-15 Published:2023-10-17

摘要/Abstract

摘要： 以折压比、抗拉强度和黏结强度为评价指标,通过正交试验确定了醋酸乙烯-乙烯共聚乳胶粉(VAE乳胶粉)改性水泥砂浆配合比的较优方案。以较优方案为基础,研究了VAE乳胶粉掺量对砂浆力学性能和抗冻性的影响。结果表明,VAE乳胶粉改性水泥砂浆配合比的较优方案灰砂比为0.375,VAE乳胶粉掺量为10%(质量分数),水灰比为0.38。VAE乳胶粉可以显著提高砂浆的抗折、抗拉、黏结强度和韧性,随着VAE乳胶粉掺量(8%~12%)增大,砂浆的抗折、黏结强度和折压比均不断增大,抗拉强度不断减小,但仍显著大于普通砂浆;随着VAE乳胶粉掺量增大,砂浆的吸水率、质量损失率和强度损失率均不断减小;随着VAE乳胶粉掺量增大,抗压强度呈先增大后减小的趋势,当VAE乳胶粉掺量为12%时,砂浆的抗压强度开始低于普通砂浆。综合考虑砂浆的强度和韧性,VAE乳胶粉的较优掺量为8%~10%。

关键词: 砂浆, VAE乳胶粉, 配合比, 强度, 韧性, 抗冻性

Abstract: Taking flexural-compressive strength ratio, tensile strength and bonding strength as evaluation indexes, the optimal scheme of mixture ratio of vinyl acetate-ethylene copolymer latex powder (VAE latex powder) modified cement mortar was determined by orthogonal test. Based on the optimal scheme, the effect of VAE latex powder content on mechanical properties and frost resistance of mortar was studied. The results show that the optimum scheme of VAE latex powder modified cement mortar is that the cement-sand ratio is 0.375, the content of VAE latex powder is 10% (mass fraction), and the water-cement ratio is 0.38. VAE latex powder can significantly improve the flexural strength, tensile strength, bonding strength and toughness of mortar. With the increase of VAE latex powder content (8%~12%), the flexural strength, bonding strength and flexural-compressive strength ratio of mortar increase continuously, and the tensile strength decreases continuously, but it is still significantly greater than that of ordinary mortar. The water absorption, mass loss rate and strength loss rate of mortar decrease with the increase of VAE latex powder content. The compressive strength increases first and then decreases with the increase of VAE latex powder content. When the content of VAE latex powder is 12%, the compressive strength of mortar begins to be lower than that of ordinary mortar. Considering the strength and toughness of mortar, the optimum content of VAE latex powder is 8%~10%.

Key words: mortar, VAE latex powder, mix ratio, strength, toughness, frost resistance

中图分类号:

TU528

王晓林, 冯红春, 周凯. VAE乳胶粉改性水泥砂浆的配合比优化及抗冻性研究[J]. 硅酸盐通报, 2023, 42(10): 3462-3469.

WANG Xiaolin, FENG Hongchun, ZHOU Kai. Mix Ratio Optimization and Frost Resistance of VAE Latex Powder Modified Cement Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(10): 3462-3469.

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