ABSTRACT

Changes in rock properties under Freezing-Thawing cycles ranging from –20 °C to 10 °C were checked for the following typical Korean rocks: granite(weathered), limestone, sandstone, tuff, shale and basalt. The specific gravity, porosity, seismic velocity and shore hardness were measured every 10 cycles for each type of rock up to 40 cycles. The specific gravity was mostly unchanged. Granite, shale and basalt showed gradual decreases in their shore hardness and seismic velocity values, these values for limestone, sandstone and tuff changed only slightly. The porosity increased in the granite, shale and basalt, whereas in the others it did not change. Due to the low tensile strength with large porosity, granite, shale and basalt were sensitive to the F-T cycles. A linear regression equation was calculated based on the results of the experiment according to properties and types of rock. The relationship between the freeze-thaw sensitivity and the regression coefficients was examined. With additional experimental data, the regression coefficients can be estimated using the F-T sensitivity. This makes it possible to predict the properties of rock as affected by freeze-thaw weathering by only measuring the initial properties without knowledge of the regression coefficients for each type of rock.

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