Cold Weather Admixture Systems Demonstration at Fort Wainwright, Alaska
ENGINEER RESEARCH AND DEVELOPMENT CENTER HANOVER NH COLD REGIONS RESEARCH AND ENGINEERING LAB
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Cold Weather Admixture Systems CWAS is a new approach to cold weather concreting that incorporates suites of commercially available chemical admixtures in concrete mixes. When used in combination, these admixtures depress the freezing point of the concrete mix water, protect the fresh concrete down to an internal temperature of 23 deg F, and promote early strength gain. In stark contrast to conventional winter concreting operations, no external heat is required in the CWAS approach. As a result, the construction and heating of temporary shelters is not required, as dictated by current practice. Given the significant cost of energy associated with external heating, a real advantage of the CWAS approach is the cost saving potential for cold weather concreting as compared to current practice. In March 2008, a full-scale field test was conducted at Fort Wainwright, Alaska. This field test provided an opportunity to apply the CWAS approach to an infrastructure project on an Army installation. This report describes the placement of a concrete hardstand using the CWAS approach and the monitoring of the structure after construction to estimate the strength gain.
- Physical Chemistry
- Ceramics, Refractories and Glass
- Construction Equipment, Materials and Supplies