Effects of Two Redispersible Polymer Powders on Efflorescence of Portland Cement-based Decorative Mortar

  • Huimei ZHU Tongji University
  • Peiming WANG Tongji University
  • Ru WANG Tongji University
  • Guofang ZHANG Tongji University
Keywords: portland cement-based decorative mortar (PCBDM), EVA, E/VL/VC, efflorescence, soluble salts

Abstract

The effects of redispersible polymer powders of ethylene/Vinyl acetate copolymer (EVA) and ethylene/vinyl laurate/vinyl chloride terpolymer (E/VL/VC) on the efflorescence of Portland cement-based decorative mortar (PCBDM) were studied. The results showed that EVA slightly prolongs the efflorescence duration of fresh PCBDM; and exacerbates efflorescence of hardened PCBDM, because it increases the content of soluble salts such as Ca2+, K+, Na+ ions in hardened PCBDM and promotes their migration. E/VL/VC exacerbates efflorescence of fresh PCBDM due to it easily dissolves in the surface water; but reduces efflorescence of hardened PCBDM, which is attributed to that it decreases the soluble salts content in hardened PCBDM and prohibits salts migration.

DOI: http://dx.doi.org/10.5755/j01.ms.20.3.4053

Published
2014-09-17
Section
CONSTRUCTION MATERIALS