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Title: Investigation of high-strength frost-resistant concrete
Authors: United States. Army. Office of the Chief of Engineers.
Tynes, W. O. (William O.)
Keywords: Concrete tests
Frost-resistant concretes
High-strength concretes
Publisher: Concrete Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; C-75-6.
Description: Miscellaneous paper
Abstract: This study was conducted to determine if reduction in air content by vibration of a well proportioned concrete mixture of relatively high cement content reduces the frost resistance of the hardened concrete and also to determine the effect of such reduction in air content on compressive strength. One 3/4-in. (19.0-mm) maximum-size crushed limestone aggregate concrete mixture was proportioned to have a compressive strength of approximately 5500 psi (37.92 MPa) at 28 days age. The mixture had an air content of 8 + 1 percent. Various vibration times were used to reduce the air content until the samples had an air content as low as could be practically obtained. Specimens were cast for determining compressive strength, resistance to freezing and thawing, and air void parameters to evaluate the effect of reduction in air content of the concrete on strength and frost resistance. Strength test results indicate that the strength did increase as the air content decreased. The results of the tests for determining resistance to freezing and thawing indicate that frost resistance decreased as air content decreased. However, it appears that even though the durability decreased as the air content was reduced, the concrete still had adequate frost resistance with nominal air contents of 1.5 percent. Even though this is a low air content percentage, the air void spacing factor was 0.0068 in. (0.1727 mm), which is below the value that is considered adequate, i.e. 0.0080 in. (0.2032 mm).
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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