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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: Chemical Structures and Performance of New High-Range Water-Reducing and Air-Entraining Agents
Author(s): M. Shonaka, K. Kitagawa, H. Satoh, T. lzumi and
Publication: Special Publication
Appears on pages(s): 599-614
Keywords: Adsorption; high-strength concrete; superplasticizers; workability
Abstract:High range water reducing agents (superplasticizers), in general, adsorb on the surface of cement particles and disperse the particles by means of electric force. Recently, the authors have developed a new type of high range water reducing agents which have characteristically long chains of polyethylene oxides (EO) as branches. When the new molecules adsorb on the particles, it is considered that long EO chains are expanded in the water / cement mixture and that each particle disperse due to their steric repulsion instead of electric. So, it can bring good workability to the concrete mix and retain fluidity for a longer period without retarding on the setting. Therefore, it can be applied to various concrete, such as high and ultra high strength concrete.
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