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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2015, Vol. 16 Issue (2): 143-150    DOI: 10.1631/jzus.A1300403
Civil and Mechanical Engineering     
Influence of vinyl acetate/ethylene copolymer powder on secondary efflorescence in Portland cement-based decorative mortar
Hui-mei Zhu, Pei-ming Wang, Guo-fang Zhang
Materials Science & Engineering Mobile Postdoctoral Center, Xi'an University of Architecture and Technology, Xi'an 710055, China; College of Materials & Mineral Resources, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, China
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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.

Key words： Portland cement-based decorative mortar (PCDM)      redispersible vinyl acetate/ethylene copolymer powder (VAE)      Secondary efflorescence      Alkalis leachability     
Received: 20 December 2013      Published: 03 February 2015
CLC:  TU502  
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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. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2015, 16(2): 143-150.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1300403     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2015/V16/I2/143

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