Effect of Pore Structure in Concrete on Frost Resistance

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Title: Effect of Pore Structure in Concrete on Frost Resistance

Author(s): H. Yamashita, K. Sakai and T. Kita

Publication: Special Publication

Volume: 170

Issue:

Appears on pages(s): 919-932

Keywords: Air-entrainment; freeze thaw durability; pore size distribution; strains.

Date: 7/1/1997

Abstract:
Frost damage of concrete gradually proceeds due to freezing and thawing of water in pore structure. The main cause is the expansion of frozen water, which is influenced by pore size distribution and air void spacing factor. This study focuses on the pore size distribution and the air void spacing factor. Freezing and thawing tests were conducted and the expansion was measured. Based on the test results, a strain model was proposed. Furthermore, the pore size distribution and the air void spacing factor were measured for different areas of an actual structure, and the degree of deterioration in the structures was compared with the expansion volume calculated using the model. It is found that the strain model represented the frost-resistance of concrete taking into account the difference of the pore size distribution and the air void spacing factor. That model also simulated the deterioration of an actual structure.