Abstract：To investigate the anti-freezing capability of light sintered shale bricks and sludge sintered bricks, following the experimental investigation, the relationship between surface change, mass loss rate, porosity rate, strength loss rate and the freezing and thawing cycles was obtained.The results show that the light sintered shale bricks inappropriate in cold region and bitter cold region which are in soaking environment, for the bad performance under the freezing action.Combining the theory of material damage and elastic and plastic mechanics theory, the freeze-thaw failure mechanism was analyzed and put forward a damage evolution with increment of porosity.Using this equation fitting experimental data, it is gotten the relationship of the two kinds of brick strength loss with the incremental of open porosity.

Keyword：light sintered shale bricks;sludge sintered bricks;freeze-thaw;porosity rate;