The Interface Chemistry Phenomena And Rheological Properties Of "Cement-Water-Superplasticizer" System

Chemical admixtures have become the indispensable ingredient of modern concrete and gained wide uses in the fields of civil engineering, water conservancy constructions, road and bridge, underground structures, oil well platforms and marine constructions, etc. As the most important kind of chemical admixture, the fabrication and application technology of superplasticizers, to some extend determine the development of production technology of concrete. Superplasticizer has undoubtedly played the key roles in the progress of high performance and the functionalization of concrete. But excessive research work has been made to develop new types of admixture and production technology, while the study on basic principles concerning the interaction of cement and superplasticizer, physico-chemical phenomena of interface were insufficient in the past, due to the fact that admixtures was regarded as a mysterious know-how or technical product. Consequently concrete production practices are now being conducted by relying on more experiences or trial and error than related theory. So the study on the interfacial chemistry phenomena and rheological properties of the"cement-water- Superplasticizer"system is in active demand. The systematical study on the interfacial properties and their influence factors based on the theory of colloidal science, interface chemistry, chemistry of cement and polymer science were conducted in order to establish the relationship among interfacial properties, microstructure and rheological characteristics of"cement– water - Superplasticizer"system, and provide the theoretical guide for the manufacture and applications of cement, concrete and superplasticizers.Four types of commercial available superplasticizers and Portland cement with different designed mineral components were employed in the study. On the basis of measurement of the molecular weight, molecular structures and determination of the technical properties of the four superplaxitcizers, the adsorption isotherm on the...