Frost and Scaling Resistance of High-Strength Concrete by Roberto C Pinto

By Roberto C Pinto

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Sample text

45. 6%. Thus, concrete that does not comply with the code requirements for water to cement ratio can be frost resistant. 45 proved to be frost resistant when tested under ASTM C 666. 0 kg/m2 weight loss criterion imposed). 6%. 5. 32. Level of allowable exposure for all mixtures according to ACI 318 requirements for air content. 33. Comparison between level of exposure according to ACI 318 requirements for air content and actual performance in the ASTM C 666 tests. 34. Comparison between level of exposure according to ACI 318 requirements for air content and actual performance in the ASTM C 672 tests.

41 PCA RD122 Frost and Scaling Resistance of High-Strength Concrete Multiple regression was performed with compressive strength at 90 days as a function of water to cement ratio and air content for all mixtures with the exception of mixture 25. An equation of the following form was obtained. 92. 6 MPa. Thus, for the same water to cement ratio, an increase in 4% of the air content (from 2% in non-air entrained to 6%) would mean a decrease of about 10 MPa in the compressive strength. 14, which would necessitate a greater amount of cement, superplasticizer, and air-entraining admixture.

The relative Ed is calculated as the squared ratio of the fundamental transverse frequency at the beginning of the test to the fundamental transverse frequency at the end of the test. For 50-N, 45-N, and 40-N mixtures, as the number of cycles increased, their transverse frequency decreased. For all other mixtures, the transverse frequency measured at the end of the test had either increased or remained approximately the same. None of the intentionally air-entrained mixtures suffered frost deterioration, no matter the water to cement ratio, total air content, spacing factor, or compressive strength.

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