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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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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: The Molecular Parameters and the Effect of Comb-Type Superplasticizers on Self-Compacting Concrete: A Comparison of Comb-Type Superplasticizer Adsorption onto a Basic Calcium Carbonate
Author(s): C. Comparet, A. Nonat, S. Pourchet, M. Mosquet, and P. Maitrasse
Publication: Special Publication
Appears on pages(s): 195-210
Keywords: adsorption; alkali sulphate; calcium carbonate; polymer; superplasticizer
Abstract:Several superplasticizers were synthesised by an esterification reaction using commercial polymethacrylic acid and polyethylene oxide chains to produce comb-type polymers. These superplasticizers, with same main chain length, but different ester ratios were evaluated in self-compacting concrete (SCC) using cement with a high C3A and soluble alkali content. There is a strong relationship between the initial efficiency (flow value) and the carboxylic ester ratio of the polymeric material. In order to further understand this relationship, preliminary adsorption isotherms using a basic calcium carbonate suspension medium in the presence of these polymers, with and without an addition of sodium sulphate were investigated. The results show clearly that the level of adsorption in a basic calcium carbonate suspension medium decreases when the concentration of sodium sulphate increases, and strongly decreases when the comb-type polymers ester ratio increases. The results tend to show an effect of ionic strength and not an effect of ions influence.
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