The Research On Preparation Of Binding Material And Concrete With Desulphurization Gypsum

With the desulphurization item of the power plants quikly build, desulphurization gypsum production increased year by year. These little efficient use desulphurization gypsum require substantial land for the needs of large stowage, not only which occupy land, but pollute the environment. Their economic and efficient use, not only that will have help for change from spent to usable, environmental protection, land conservation, reducing the consumption of non-renewable resources, but can mitigate the economic burden for enterprises and promoting their sustainable development.This paper is designed to prepare the binding material and concrete by desulphurization gypsum, cement, stone, sand and admixture. The performances of binding material are studied in the paper. The experimental results showed that it is absolutely feasible to prepare binding material by using cement, desulphurization gypsum and superplasticizer after drying and grinding of desulphurization gypsum. The cement micellae compressive and bending strength of adding desulphurization gypsum(10percent)can meet the standard requirements of P.042.5, which means the binding material’s set time and soundness are qualified. The concrete is prepared by adding with naphthalene superplasticizer and the desulphurization gypsum replacing 30percent cement. The concrete is up to the strength of the C30concrete; and its impermeability meets the requirements of P12. Through XRD analysis of variant age micellae and concrete samples, the results indicate that the hydration products of composite using desulphurization gypsum and cement are main tobermorite, ettringite and dihydrate gypsum. To form compact hardened material, the tobermorite, ettringite and dihydrate gypsum bind mutually, then strength is produced.