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首页> 外文期刊>International Journal of Chemistry and Chemical Engineering >Influence of vinyl acetate-ethylene copolymer on early-age ettringite formation and behavior in OPC/CAC/hemihydrate gypsum binder system:A case of higher CAC content than OPC content in the binder
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Influence of vinyl acetate-ethylene copolymer on early-age ettringite formation and behavior in OPC/CAC/hemihydrate gypsum binder system:A case of higher CAC content than OPC content in the binder

机译：Influence of vinyl acetate-ethylene copolymer on early-age ettringite formation and behavior in OPC/CAC/hemihydrate gypsum binder system:A case of higher CAC content than OPC content in the binder

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摘要

In this work,the effect of vinyl acetate-ethylene(VAE)copolymer on ettringite formation and behavior at early age in OPC/calcium aluminate cement/hemihydrate gypsum binder system(BS)was investigated.During the study the VAE dosage was 3 by weight of the binder.The phase composition of the hydrated BS in air after 6 hours,1,3 and 7 days of hardening was investigated by XRD.The microstructure of the hydrated and hardened BS pastes were studied by scanning electron microscopy(SEM).Results from the study indicate that VAE speeds up the hydration of hemihydrate gypsum and slows down the ettringite formation.It was also observed that after 7 days of hardening,the presence of VAE in the BS appears to stabilize the ettringite.There is a change in the appearance of ettringite crystals in VAE-modified BS pastes,i.e.prismatic crystals turn into needle-like crystals,while the average crystals size decreases.

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