复合增稠剂对大流态薄层砂浆性能的影响及其抗裂机理

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (6): 1938-1949.

所属专题：水泥混凝土

复合增稠剂对大流态薄层砂浆性能的影响及其抗裂机理

杨文秀^1,2, 赵青林^1,2, 周明凯^1,2, 吴德凡², 武苗苗^1,2, 沈卫国^1,2

1.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070;
2.武汉理工大学材料科学与工程学院,武汉 430070

收稿日期:2023-03-29 修订日期:2023-03-29 出版日期:2023-06-15 发布日期:2023-06-25
通信作者: 赵青林,博士,教授。E-mail:zhaoqinglin@whut.edu.cn
作者简介:杨文秀(1996—),女,硕士研究生。主要从事大流态砂浆方向的研究。E-mail:ywenxiu2022@163.com
基金资助:
国家自然科学基金(52272025)

Effect of Composite Thickener on Performance of Large-Flow Thin Layer Mortar and Its Anti-Cracking Mechanism

YANG Wenxiu^1,2, ZHAO Qinglin^1,2, ZHOU Mingkai^1,2, WU Defan², WU Miaomiao^1,2, SHEN Weiguo^1,2

1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;
2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

Received:2023-03-29 Revised:2023-03-29 Online:2023-06-15 Published:2023-06-25

摘要/Abstract

摘要： 基于温轮胶(WG)和羟丙基甲基纤维素醚(HPMC)这两种增稠剂的特点,将二者复掺以解决严酷环境下薄层施工用水泥基大流态砂浆易开裂的问题。研究中通过对比WG、HPMC及复合增稠剂的作用效果,明晰了复合增稠剂对大流态砂浆工作性能、力学性能及抗裂性能的影响规律,并结合冷冻扫描电镜对复合增稠剂抗裂作用机理进行了剖析。结果表明:单掺WG、HPMC均无法解决严酷环境下砂浆开裂的问题;复合增稠剂在保水性和抗裂性能上表现更优,且砂浆弹性模量降低,柔韧性提升,夏季在室外暴晒也不会开裂。砂浆抗裂机理在于复合增稠剂融合了WG和HPMC各自优势特点,在体系浆液空间形成三维网状结构与膜状结构的叠加,三维网状结构可大幅增强浆料稳定性,而膜状结构在再次增强浆料稳定性的同时大幅提升砂浆的保水性,进而减弱水分扩散蒸发,达到砂浆抗裂的目的。

关键词: 温轮胶, 羟丙基甲基纤维素醚, 大流态砂浆, 抗裂性能, 流动性, 力学性能

Abstract: For the characteristics of the two thickeners, welan gum (WG) and hydroxypropyl methyl cellulose (HPMC), they were added to solve the problem of easy cracking of cement-based large-flow mortar for thin layer construction under harsh environments. By comparing the effects of WG, HPMC, and composite thickener, the influence law of the composite thickener on the workability, mechanical properties and anti-cracking of large-flow mortar was elaborated. The mechanism of anti-cracking action of the composite thickener was also explained by cryo-scanning electron microscopy. The results show that neither WG nor HPMC alone can solve the problem of mortar cracking under harsh environments. The composite thickener performs better in water retention and anti-cracking, and the modulus of elasticity of mortar becomes lower, and the flexibility is improved, so that it will not crack in outdoor exposure in summer. The anti-cracking mechanism is considered as that the composite thickener combines the respective advantages of WG and HPMC. It forms the superposition of three-dimensional network structure and film structure in the system slurry space. The three-dimensional network structure can greatly enhance the stability of slurry, while the film effect again enhances the stability of slurry and greatly improves the water retention of mortar, which in turn significantly reduces water diffusion and evaporation to achieve the purpose of mortar anti-cracking.

Key words: welan gum, hydroxypropyl methyl cellulose, large-flow mortar, anti-cracking, fluidity, mechanical property

中图分类号:

TU525

杨文秀, 赵青林, 周明凯, 吴德凡, 武苗苗, 沈卫国. 复合增稠剂对大流态薄层砂浆性能的影响及其抗裂机理[J]. 硅酸盐通报, 2023, 42(6): 1938-1949.

YANG Wenxiu, ZHAO Qinglin, ZHOU Mingkai, WU Defan, WU Miaomiao, SHEN Weiguo. Effect of Composite Thickener on Performance of Large-Flow Thin Layer Mortar and Its Anti-Cracking Mechanism[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 1938-1949.

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复合增稠剂对大流态薄层砂浆性能的影响及其抗裂机理

Effect of Composite Thickener on Performance of Large-Flow Thin Layer Mortar and Its Anti-Cracking Mechanism

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