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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Action Mechanisms of Comb-Type Superplasticizers Containing Grafted Polyethylene Oxide Chains
Author(s): E. Sakai, J. K. Kang, and M. Daimon
Publication: Special Publication
Appears on pages(s): 75-90
Keywords: anhydrite; gypsum; hydration; superplasticizers
Abstract:In connection with environmental problems, the utilization of industrial materials waste, municipal refuse, sludge or its incineration ashes as raw materials for cement has recently begun. If their utilization amount increases in the future, it will result in the increase in aluminate phase. It is necessary to clarify the influence of superplasticizers on the hydration of aluminate phase. In addition, the fluidity of the cement paste which the sulfate ion content is high, is decreased by addition of comb-type superplasticizers. This is also closely related to initial hydration of cement. In order to clarify the action mechanisms of comb-type super-plasticizers, this paper discusses the influence of super-plasticizers on the early hydration of C,A-calcium sulfates by quantitative XRD compared with the case of naphthalene type superplasiticizer. Early hydration of C,A is accelerated by adding of comb-type super-plasticizers in C,A-calcium sulfates systems. In the case of comb-type superplasticizers, SO,“- contents in gel formed around C,A is decreased. It is necessary to control the early hydration reaction of aluminate phase in order to control the fluidity of the cement with comb-type superplasticizers.
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