改性煤气化渣对水泥砂浆性能影响研究OA

The water absorption and crushing indexes of standard sand,unmodified coal gasification slag,coal gasification slag modified by slag slurry and water glass slurry modified by slag gasification slag and the porosity,strength,frost resistance and drying shrinkage characteristics of the cement mortar prepared by them are studied by comparison.The results show that the water absorption and crushing value of the undis-turbed coal gasification slag are large,and the infiltration modification of slag slurry can physically fill the internal pores of the coal gasification slag and reduce the water absorption and crushing value.The infiltration of sodium silicate slurry can not only play the role of physical filling,but also the activation of sodium silicate can further improve the particle strength of coal gasification slag,reduce the crushing value,and im-prove the interface bonding characteristics of coal gasification slag cement slurry.The porosity,mechanical properties,frost resistance and dry shrinkage characteristics of cement mortar prepared with modified coal gasification slag are significantly improved.The modified coal gasifica-tion slag infiltrated by water glass slurry is superior to the pure slag slurry in improving the bending strength and freezing resistance of mortar.The modification effect of dry shrinkage is similar to that of pure slag slurry.