EXPERIMENTAL RESEARCH ON FROST RESISTANCE OF DRY HANGING FACING STONE

Taking the natural dry hanging stone which has been commonly used in stone curtain wall engineering as an example, under freeze-thaw cydes, the changes of compressive strength and flexural strength of granite, limestone and sandstone with different water absorption and protective treatments were studied through tests, the test results showed that the protective treatment could promote the frost resistance of the stone.By conducting different numbers of freeze-thaw cycling test at the same time, the frost resistance coefficients of three kinds of stones as the change of freeze-thaw cycles was compared and analyzed, the fitting curves of frost resistance coefficient and the number of freezing and thawing cycles were obtained, the attenuation law of frost resistance coefficient with the number of freeze-thaw cycles was obtained and the minimum number of freeze-thaw cycles of three kinds of commonly-used stones occurred damage was predicted.