Research On The Compatibility Between Regeneration Cement And Polycarboxylate-superplasticizer

Currently, the use of recycled concrete for preparation of regeneration cement has been validated to be feasible. However, there are still some problems for optimizing the performance of regeneration cement, such as compatibility with various water reducer, especially with the superplasticizer are needed to study. Polycarboxylate-superplasticizer as the third generation superplasticizer following with naphthalene-superplasticizer which is the main representative of the second generation superplasticizer were developed in Japan in the1980s, the development of production, has a new water-reducing mechanism and molecular structure, and had been used in concrete projects since1990s. It is superior to the second generation superplasticizer of naphthalene-superplasticizer in such main aspects:in the case to get the same effect of reducing water with low dosage, water-reducing rate is high, with excellent slump retention, low shrinkage, low alkali content, bleed air is moderate, the material is green, etc., and the production is no less obvious defects. The promotion of Polycarboxylate-superplasticizer in concrete projects accelerates the rapid development of modern concrete technology and improve the quality of concrete production (durability improved), so as to achieve the aim that the energy, raw materials and land are saved. Conserve resources and protect the ecological environment is the fundamental policy, thereby reducing the intensity of energy consumption, the importance of improving the efficiency and effectiveness is regarded as the increasingly prominent.In this paper, through the study of compatibility of cement and superplasticizer, several important factors affect the compatibility of superplasticizer and regeneration cement are needed to study, such as:the mineral composition of clinker, cement MgO content, grinding system, gypsum dosage. Through research and analysis of different factors affect the compatibility of cement and superplasticizer, provide guidance for cement clinker calcination and cement preparation. Experiments of cement paste fluidity were used as a macroeconomic indicators to evaluate the compatibility of cement and superplasticizer and the measurement of the adsorption capacity of cement particle surface in were used as microscopic evaluation, synthesize the two evaluation criteria to assess the compatibility of cement and. And according to the influence of different factors, a suitable range of options were provided for the choice of raw materials of regeneration cement, the rate of the value selected, the calcination system, gypsum dosage, grinding system. Thereby, the compatibility of cement and superplasticizer was fully optimized and provided theoretical guidance for the promotion and industrial production of regeneration cement.