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Authors |
신진용 ; 김재영 ; 홍지숙 ; 서정권 ; 이영석 |
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Keywords |
고유동화제 ; 리그노술폰산 ; 나프탈렌 술폰산 축합물 ; 멜라민 술폰산 축합물 ; 폴리카복실레이트 superplasticizer ; lignosulfonic acid ; naphthalene sulfonated formaldehyde condensate ; melamine sulfonated formaldehyde condensate ; polycarboxylate |
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Abstract |
To research effects of various chemical superplasticizers(Lignosulfonic acid, Naphthalene sulfonated formaldehyde condensate, melamine sulfonated formaldehyde condensate, and Polycarboxylate) on the hydration of cement, experiments involving XRD, SEM, and DSC have been analysed with cement paste specimens. Regardless of types and dosages of superplasticizers, hydration reaction of specimen applied superplasticizer was delayed to 3 day, but then it showed similarity to plain which don't add superplasticizer. Moreover, the hydrating rate of cement paste was retarded as dosage of superplasticizer was increased. Also, kinetics related with hydrate of cement paste was slow in order of lignosulfonic acid, polycarboxylate, melamine and naphthalene sulfonated formaldehyde condensate. Nevertheless, when all kinds of chemical admixtures were used, morphologies of these hydrates were denser and more uniform than those of plain.
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