Effects of microporosity on the compression strength and freezing durability of high-strength concretes

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Abstract
High-strength concretes were produced using four different binder combinations. Curing and heat treatment tests were conducted and the results were used to validate a theory relating binder paste microporosity, concrete compression strength and freezing durability. The porosities of the test concretes were measured by mercury porosimetry and the microporosity of the hardened cement paste by nitrogen adsorption. Thin-section microscopy was also used. Compression and flexural strength values of the test concretes were obtained. The freezing durability of the test concretes were examined by a freeze-thaw test in water and by a salt freeze test, where freezing and thawing took place in a salt solution.

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