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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: Interaction between Cements and Superplasticizers
Author(s): H. Lombois-Burger, L. Guillot, and C. Haehnel
Publication: Special Publication
Appears on pages(s): 357-374
Keywords: adsorption; aqueous phase; cement; interaction; incompatibility; PEO side chains; polycarboxylate; rheology; sulphates; superplasticizer
Abstract:The interaction between CEM I type cements and PolyCarboxylates with PolyEthyleneOxide side chains superplasticizers was examined to clarify the origin of incompatibility problems. Particular care was devoted to the possible role of a competition between sulphates and superplasticizer in these issues. Both laboratory and industrial cements were examined so as to analyze the influence of set regulator amount and/or nature, and of alkali level. The study mainly focused on the ionic composition of the aqueous solution, the consumption isotherms of the superplasticizers and the rheology of cement grouts. The results showed a major influence of the alkali sulphates of the clinker: the higher the latter, the higher the concentration of sulphates in the aqueous solution and the lower the superplasticizer consumption. The yield stress was correlated to superplasticizer consumption: it decreased when the consumption increased. On the other hand, the amount and nature of the set regulator appeared to induce a second order effect on the aqueous phase composition and on the superplasticizer consumption.
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