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CLC number: TU502

On-line Access: 2015-02-03

Received: 2013-12-20

Revision Accepted: 2014-06-09

Crosschecked: 2015-01-23

Cited: 2

Clicked: 2598

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Hui-mei Zhu

http://orcid.org/0000-0003-1247-6981

Guo-fang Zhang

http://orcid.org/0000-0002-2039-580X

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Journal of Zhejiang University SCIENCE A 2015 Vol.16 No.2 P.143-150

http://doi.org/10.1631/jzus.A1300403


Influence of vinyl acetate/ethylene copolymer powder on secondary efflorescence in Portland cement-based decorative mortar


Author(s):  Hui-mei Zhu, Pei-ming Wang, Guo-fang Zhang

Affiliation(s):  Materials Science & Engineering Mobile Postdoctoral Center, Xi’an University of Architecture and Technology, Xi’an 710055, China; more

Corresponding email(s):   zhuhuimeitj@163.com, zgftj@sina.com

Key Words:  Portland cement-based decorative mortar (PCDM), redispersible vinyl acetate/ethylene copolymer powder (VAE), Secondary efflorescence, Alkalis leachability


Hui-mei Zhu, Pei-ming Wang, Guo-fang Zhang. Influence of vinyl acetate/ethylene copolymer powder on secondary efflorescence in Portland cement-based decorative mortar[J]. Journal of Zhejiang University Science A, 2015, 16(2): 143-150.

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author="Hui-mei Zhu, Pei-ming Wang, Guo-fang Zhang",
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%T Influence of vinyl acetate/ethylene copolymer powder on secondary efflorescence in Portland cement-based decorative mortar
%A Hui-mei Zhu
%A Pei-ming Wang
%A Guo-fang Zhang
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%D 2015
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1300403

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T1 - Influence of vinyl acetate/ethylene copolymer powder on secondary efflorescence in Portland cement-based decorative mortar
A1 - Hui-mei Zhu
A1 - Pei-ming Wang
A1 - Guo-fang Zhang
J0 - Journal of Zhejiang University Science A
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DOI - 10.1631/jzus.A1300403


Abstract: 
In this paper, the effect of redispersible vinyl acetate/ethylene copolymer powder (VAE) on the secondary efflorescence of portland cement-based decorative mortar (PCDM) was evaluated by alkalis leachability. The secondary efflorescence substances were investigated using X-ray diffraction (XRD), X-ray fluorescence (XRF), and scanning electron microscope (SEM). The mechanism was also analyzed from the aspect of soluble components in PCDM. The results show that the secondary efflorescence level of PCDM can be quantitatively evaluated by alkalis leachability, with a higher alkali leachability indicating more obvious secondary efflorescence. VAE increases the concentrations of free alkalis ions including Ca2+, K+, Na+ of PCDM, improves the capacity of pore water transmitting ions, increases the alkalis leachability of PCDM, and accordingly promotes the secondary efflorescence of PCDM.

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

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

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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[11]Silva, D.A., Roman, H.R., Gleize, P.J.P., 2002. Evidences of chemical interaction between VAE and hydrating Portland cement. Cement and Concrete Research, 32(9):1383-1390.

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