Effects of Two Redispersible Polymer Powders on Efflorescence of Portland Cement-based Decorative Mortar
Keywords:portland cement-based decorative mortar (PCBDM), EVA, E/VL/VC, efflorescence, soluble salts
AbstractThe 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.
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