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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: Development of Slump-Loss Controlling Agent with Minimal Setting Retardation
Author(s): D. Hamada, H. Sato, H. Yamamuro, T. Izumi, and T. Mizunuma
Publication: Special Publication
Appears on pages(s): 127-142
Keywords: concrete; setting retardation; slump-retention; superplasticizer
Abstract:A new slump-loss-controlling agent was found that could control the slump retention time for more than 90 minutes with minimal setting retardation. This slumploss-controlling agent was based on the polyether-grafted polymer in which the specific monomers were co-polymerized. Although this agent did show weak initial dispersing ability of cement particles just after the addition to cement slurry, it was decomposed in the alkaline condition of the cement slurry and gradually enhanced its dispersing ability, which made long retention of dispersability possible. Utilizing the technology of long polyether-grafted chains, which was previously reported to be very effective to disperse cement particles by steric repulsion, high dispersing retention ability with lower dosage and minimal setting retardation could be achieved. This slump-loss-controlling agent has already been used successfully worldwide. This technology will bring various possibilities and merits in concrete construction field such as shortening the construction period.
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