Resistance of Non air-Entrained Rice Hull Ash Concrete to Freezing and Thawing in Saline Environment

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Title: Resistance of Non air-Entrained Rice Hull Ash Concrete to Freezing and Thawing in Saline Environment

Author(s): P. Sandberg

Publication: Special Publication

Volume: 154

Issue:

Appears on pages(s): 95-102

Keywords: aggregates; freeze thaw durability; rice; salts; scaling; silica fume; superplasticizer; Materials Research

Date: 5/1/1995

Abstract:
The resistance of rice hull ash (RHA) concrete to freezing and thawing in saline environment was studied in the laboratory, for non-air- entrained high performance and normal concrete. The Swedish standard test for concrete resistance to freezing and thawing in saline environment was used. Although the number of tests was limited, the results were very promising for the use of RHA in non-air-entrained normal or high performance concrete. The laboratory salt scaling for concrete with 15 to 30 percent replacement of portland cement with RHA indicated that RHA concrete without air entrainment would be fairly resistant to freezing and thawing in most applications except for in very severe climates. No indications on an accelerated scaling rate over time was observed for RHA concrete, as opposed to the accelerated scaling rate found for a non-air-entrained high performance silica fume concrete tested.