醋酸乙烯/乙烯共聚可再分散乳胶粉对硅酸盐水泥基饰面砂浆二次泛白的影响 |
| |
摘 要: | 目的:采用碱浸出量定量评价醋酸乙烯/乙烯共聚可再分散(VAE)乳胶粉对硅酸盐水泥基饰面砂浆二次泛白的影响,并分析其作用机理。创新点:采用定量化手段评价硅酸盐水泥基饰面砂浆的二次泛白程度。方法:1.采用碱浸出率方法定量评价硅酸盐水泥基饰面砂浆的二次泛白程度;2.采用水浸取法测试硅酸盐水泥基饰面砂浆内部可溶性Ca2+、K+和Na+的含量,pH值及可溶性物质总含量等;3.以硅酸盐水泥基饰面砂浆毛细孔失水速率表征其内部水的蒸发速率。结论:1.硅酸盐水泥基饰面砂浆的碱浸出量可用于定量评价其二次泛白程度,碱浸出量越大,二次泛白越严重;当碱浸出量大于1 g/(m2·h)时,硅酸盐水泥基饰面砂浆会呈现出可见二次泛白;2. Ca2+, K+和Na+等碱离子是导致硅酸盐水泥基饰面砂浆二次泛白的主要根源;3. VAE乳胶粉增加了硅酸盐水泥基饰面砂浆内部Ca2+,K+和Na+等碱离子的含量,并且促进它们向表面迁移,增加了碱浸出率,从而促进二次泛白。
|
关 键 词: | 硅酸盐水泥基饰面砂浆 VAE乳胶粉 二次泛白 碱浸出率 |
Influence of vinyl acetate/ethylene copolymer powder on secondary efflorescence in Portland cement-based decorative mortar |
| |
Authors: | Hui-mei ZHU Pei-ming WANG Guo-fang ZHANG |
| |
Institution: | 1. Materials Science & Engineering Mobile Postdoctoral Center, Xi’an University of Architecture and Technology, Xi’an 710055, China 2. Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, China |
| |
Abstract: | |
| |
Keywords: | Portland cement-based decorative mortar (PCDM) redispersible vinyl acetate/ethylene copolymer powder (VAE) Secondary efflorescence Alkalis leachability |
本文献已被 万方数据 等数据库收录! |