2006•China Concrete and Cement ProductsRequires access

Study on the Factors of Influencing Water-reducing Effect of Superplasticizers in Building Gypsum

QU Jin-dong

Abstract

In order to improve the water-reducing efficiency of superplasticizers,the influence of superplasticizer on the dispersion and strength of building gypsum was investigated from the point of specific surface area of gypsum particles,addition method of superplasticizers and pH value,and their influencing rules were also analyzed.The results indicate that appropriate increase in fineness of gypsum particles will improve the water-reducing efficiency of superplasticizers.And superplasticizers with different addition methods behave as a different way.Besides,the dispersion effect of superplasticizers is in the best when they are mixed into gypsum prior to adding the water and pH value also has the influence on the dispersion of superplasticizers which is in the best under weakly alkalescent environment.

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Key concepts: Superplasticizer, Gypsum, Fineness, Dispersion (optics), Materials science, Geotechnical engineering, Composite material, Compressive strength