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In order to research the compressive strength and freeze-thaw durability of recycled aggregate concrete (RAC) under the combined actions of high temperature and freeze thawing recycle, a total of 240 cube specimens with different mix proportions were produced. In this article, two kinds of freeze-thaw tests were carried out: the specimens immersed in water (FTW) and the specimens immersed in salt solution (FTS). The influences of four factors on the freeze-thaw durability of the concrete were analyzed, such as temperatures, recycled aggregate replacement ratios, water-binder ratios and fly ash dosages. The results indicate that the four factors all have significant effects on the compressive strength of the concrete specimens. The recycled concrete contained 30% fly ash has better resistance against to the high temperature and freeze thawing deterioration. In addition, salt-frost specimen has more severe denudation than water-frost specimen, and the compressive strength loss of salt-frost specimen is much larger than that of water-frost specimen. The results can provide the theoretical basis on the durability design of RAC subjected to harsh environmental conditions.

Compressive behavior and freeze-thaw durability of concrete after exposure to high temperature