Influence of Potassium Sulfate and Potassium Fluoride on the Fluidity of Cement Paste with Polycarboxylate Based Superplasticizers Having Different Molecular Structure

【Author】

Kazuki Matsuzawa;Daiki Atarashi;Masahiro Miyauchi;Etsuo Sakai;

【Abstract】

<正>Reducing emission of CO_2 is the most important mission in cement industry.And cement industry must contribute to recycling by utilization of industrial waste and by-products as raw materials or fuel.Sulfate and fluoride is prospective ingredient to lower calcinations temperature of cement manufacturing for environmental loading reduction. This paper discusses the influence of inorganic electrolytes on the fluidity and the adsorption of polycarboxylate based superplastisizer having different molecular structure Using a control stress type rheometer(rotational cylinder viscometer),the viscosity of the suspension was measured to estimate the apparent viscosity at a shear stress of 200 Pa The adsorbed amount of polymer was calculated from the concentration of the polymer in the initial solution and the liquid phase.The unadsorbed polymer concentration was measured by carbon analysis using a total organic carbon analyzer(TOC).Three types polycarboxylate based superplasticizer were used in this study.P-70 has lower amount of Junctional groups and longer grafted chain.P-10 has larger amount of functional groups and shorter grafted chain.And superplasticizer P-34, having moderate grafed chain length and amount of functional groups was also used The number expresses the degree of polymerization of grafted chain.In the case that no inorganic electrolyte such as potassium sulfate(K_2SO_4) or potassium fluoride(KF) was added,the apparent viscosity and yield shear stress of cement paste was remarkably decreased as the dosage of polycarboxylate based superplasticizer was increased And in the case of P-10,the apparent viscosity and yield stress of cement paste was much lower than that of the case of P-70.When the concentration of inorganic electrolyte rose, the apparent viscosity rapidly increased In the case of K_2SO_4,the apparent viscosity of cement paste with P-10 was smaller than that with P-34.On the contrary,in the case of KF,P-34 indicated the smaller apparent viscosity than P-10.The amount of adsorbed P-10 was larger than that of P-34. Originality The fluidity and the adsorption of polycarboxylate based superplasticizers having different molecular structure were cleared in this study.From this research results,we can contribute to lower the calcinations temperature of cement manufacturing for environmental loading reduction.

【Keywords】

Utilization of by-product;;Enviromental loading reduction;;Polycarboxylate based superplastisizer;;Fluidity;;Apparent viscosity;;Amount of adsorbed superplasticizer

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