EVALUATION OF THE RHEOLOGICAL BEHAVIOR OF CEMENT PASTES THROUGH OSCILLATORY TESTS: STUDY OF THE TYPE OF CHEMICAL ADMIXTURE

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Abstract

Rheological studies are interesting for studies and analysis of the fluidizing action of chemical admixtures. These chemical admixtures can minimize the viscosity of the mixtures and reduce the demand of water. This is very attractive from the point of view of durability of cementitious materials. Thus, the aim of the paper is to evaluate the rheological behavior of cement pastes, through the property of elastic modulus G', under the intervention of the types of chemical admixtures (plasticizer RA1 and superplasticizer RA2). These admixtures are based on polycarboxylate and they have had different levels of solids in suspended. The pastes were produced with Brazilian Portland Cement type CP V-ARI and a water/binder ratio of 0.55. Through the analysis of the results, it was possible to infer that the superplasticizer chemical admixture was more compatible with the cement used than the plasticizer chemical admixture. Superplasticizer chemical admixture delayed the setting time of the mixture (approximately 50 minutes) and kept it more workable for much longer time. This behavior may be desirable in some field applications and in operations of preparing, mixing, transporting and molding of concrete, for example. In terms of performance, it was possible to elucidate, in descending order of performance, related to elastic modulus: paste with superplasticizer chemical admixtures, paste with plasticizer chemical admixtures and reference paste (without chemical admixtures).

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Published

2022-12-22

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