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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 Use of Chemical Admixtures to Facilitate Placement of Concrete at Freezing Temperatures
Author(s): S. A. Farrington and B. J. Christensen
Publication: Special Publication
Appears on pages(s): 71-86
Keywords: accelerating admixture; chemical admixture; cold weather concrete; compressive strength; high-range water reducing admixture; low temperature; water reducing admixture
Abstract:Concrete that is to be placed under cold weather conditions must be protected from freezing and may be required to have adequate setting behavior and strength development. There are a number of different approaches that can be used to ensure protection from freezing and the development of mechanical properties of such concrete. One approach is the addition of chemical admixtures that accelerate the cement hydration in the concrete. This paper presents the results of studies that examined the performance of a new cold weather admixture (CWA). The performance of the CWA was evaluated in concrete with an initial concrete temperature of 11-13°C that was cured at an air temperature of either -1 °C, -7°C, or -11 °C. The addition of the CWA allowed the concrete to set and gain strength under the cold weather conditions. Lowering the w/c of the concrete with a high-range water reducing admixture coupled with the addition of the CWA further improved the setting and strength development of the concrete at the lowest curing temperature tested. These results suggest that the use of the CWA will allow current cold weather concreting guidelines to be revised to allow for lower initial concrete temperatures.
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