可再分散乳胶粉对钢结构界面砂浆的性能影响和机理分析

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (6): 1999-2004.

可再分散乳胶粉对钢结构界面砂浆的性能影响和机理分析

王小燕^1,2, 叶武平^1,2, 曹力强^1,2

1.中国建筑科学研究院有限公司,北京 100013;
2.建筑安全与环境国家重点实验室,北京 101100

收稿日期:2023-11-16 修订日期:2024-01-25 出版日期:2024-06-15 发布日期:2024-06-18
作者简介:王小燕(1990—),女。主要从事特种砂浆及其添加剂的研究。E-mail:13260151682@163.com
基金资助:
中国建筑研究院有限公司青年科研基金(20210122331030007)

Influence and Mechanism Analysis of Re-Dispersible Latex Powder on Performance of Steel Structure Interface Mortar

WANG Xiaoyan^1,2, YE Wuping^1,2, CAO Liqiang^1,2

1. China Academy of Building Research Co., Ltd., Beijing 100013, China;
2. Key State Lab of Building Safety and Environment, Beijing 101100, China

Received:2023-11-16 Revised:2024-01-25 Online:2024-06-15 Published:2024-06-18

摘要/Abstract

摘要： 可再分散乳胶粉是钢结构界面砂浆制备的关键材料。本文研究了可再分散乳胶粉的掺量对界面砂浆28 d抗压强度、抗折强度、拉伸黏结强度的影响,同时结合扫描电镜、X射线衍射等微观分析手段对可再分散乳胶粉提升界面砂浆的黏结性机理进行了分析。结果表明:在钢结构界面砂浆的制备中,可再分散乳胶粉的适宜掺量为15%(质量分数);在适宜掺量下,界面砂浆的拉伸黏结强度达到1.12 MPa,压折比为2.3,乳胶粉的加入能有效改善砂浆柔韧性;乳胶粉的加入改变了砂浆的孔结构,孔隙率变大;界面过渡区的水化产物主要是聚合膜包裹水化产物C-S-H凝胶和Ca(OH)₂。

关键词: 可再分散乳胶粉, 钢结构界面砂浆, 力学性能, 韧性, 孔结构, 微观分析

Abstract: Re-dispersible latex powder is the key material for the preparation of steel structure interface mortar. In this paper, the influence of the content of re-dispersible latex powder on the 28 d compressive strength, flexural strength and tensile bond strength of interfacial mortar was researched. At the same time, combined with scanning electron microscopy, X-ray spectroscopy and other microscopic analysis methods, the bonding mechanism of re-dispersible latex powder to enhance the interfacial mortar was analyzed. The results show that the suitable content of re-dispersible latex powder is 15% (mass fraction, same below) in the preparation of steel structure interface mortar. Under the appropriate dosage, the tensile bond strength of the interface mortar reaches 1.12 MPa, and thecompressive-flexural strength ratio is 2.3. The addition of latex powder can effectively improve the flexibility of the mortar. The addition of latex powder changes the pore structure of the mortar, and the porosity becomes larger. The hydration products in interfacial transition zone are mainly polymer film encapsulated hydration products C-S-H gel and Ca(OH)₂.

Key words: re-dispersible latex powder, steel structure interface mortar, mechanical property, toughness, pore structure, microscopic analysis

中图分类号:

TU528

王小燕, 叶武平, 曹力强. 可再分散乳胶粉对钢结构界面砂浆的性能影响和机理分析[J]. 硅酸盐通报, 2024, 43(6): 1999-2004.

WANG Xiaoyan, YE Wuping, CAO Liqiang. Influence and Mechanism Analysis of Re-Dispersible Latex Powder on Performance of Steel Structure Interface Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(6): 1999-2004.

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