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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: Year-Round Accelerating Admixture
Author(s): J. W. Brook and R. J. Ryan
Publication: Special Publication
Appears on pages(s): 535-556
Keywords: accelerating agents; admixtures; cold weather construction; concretes; curing; freeze-thaw durability; freezing; protection; strength; temperature; water content; Materials Research
Abstract:An innovative chemical admixture has been developed which is effective between -7 and 35 C (20 and 95 F) and which is useful year-round. High dosage levels of 3910 to 5860 ml/100 kg (60 to 90 oz/cwt) of cement help to prevent concrete from freezing in cold weather at -7 to 0 C (20 to 32 F) ambient temperature while providing required set time and strength acceleration. Lower dosage rates of up to 1955 ml/100 kg (30 oz/cwt) of cement provide better acceleration at more moderate ambient temperatures. It provides the ability to better control set time of concrete that is retarded because cement has been replaced by fly ash. A variety of tests have shown that the admixture does not initiate corrosion of steel reinforcement embedded in concrete. Laboratory data is presented that demonstrates that the new chemical admixture provides strong, durable concrete with accelerated set, lower water demand, increased strength development, and will help prevent freezing in cold environments as low as -7 C (20 F) ambient temperature when properly air entrained. The use of warm concrete mix components and curing conditions normally practiced in the industry and recommended by ACI in newly published guidelines for cold weather concreting are not entirely necessary. Finally, use of this all-temperature accelerating admixture provides savings in both concreting cost and time.
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