水泥粉煤灰稳定炉渣煤矸石混合料抗冻试验

IIn order to study the frost resistance of cement fly ash stabilized slag coal gangue mixture, five slag replacement rates and four cement contents were selected to carry out freeze-thaw cycle tests. The effects of slag replacement rate, cement content and freeze-thaw cycle times on macroscopic appearance, quality change and unconfined compressive strength damage of the mixture were analyzed. The results show that the damage of unconfined compressive strength increase with the increase of freeze-thaw cycles. With the increase of slag replacement rate, the damage of unconfined compressive strength first decreases and then increases. When slag replacement rate was 50%, the frost resistance was the best. The strength attenuation is caused by the peeling and loss of the gel, and the internal cracks of the specimen gradually develop and penetrate. The strength attenuation model between the relative dynamic elastic modulus and the relative compressive strength under freeze-thaw cycles was established, which is convenient to evaluate the frost resistance of the mixture.