Effect of polycarboxylate-type water reducer on gypsum-based self-leveling mortar and its mechanisms
In this paper,the effects of the doping amount of polycarboxylate-type water reducer(PC)on the flowability of gyp-sum-based self-leveling mortar,physical strength and water resistance of mortar hardened boby were systematically studied.The ef-fect mechanism was analyzed by mercury-pressure testing technique(MIP)and scanning electron microscope(SEM).The results showed that the water consumption of gypsum-based self-leveling mortar gradually decreased with the increase of PC admixture.The effect of PC admixture on improving the physical strength of mortar was significant.The water resistance of the mortar hard-ened boby was enhanced gradually with the increase of PC admixture.The PC doping can significantly reduce the porosity and re-fine the pore size of the mortars hardened body.As the PS was added,the gypsum dihydrate crystals are refined,the crystal lap compactness is improved,and the performance of gypsum-based self-leveling mortar is effectively enhanced.
polycarboxylate-type water reducergypsum-based self-leveling mortarmechanical performancewater resistancepore structure
万方数据
维普
