Deterioration Behavior of Low Heat Portland Cement Paste under Sulfate Attack
Low heat portland cement is widely applied in hydraulic concrete,where much attention should be paid to its performance of sulfate attack.In this paper,the evolution laws of physical and mechanical properties such as porosity,sulfate ion distribution,expansion rate,compressive strength and Vickers hardness of low heat cement-based pastes were determined through the full immersion test of sodium sulfate solution,as well as the compared ordinary cement pastes.Based on which,their sulfate attack deterioration behavior and damage mechanism were also analyzed.Results show that compared with ordinary portland cement,low heat cement has better resistance to sodium sulfate attack,and adding 30% fly ash could also improve its anti-corrosion performance.The corrosion section of low heat cement paste can be divided into degraded zone,strengthened zone,ingressive zone,and sound zone from the surface to the inside.Vickers hardness could better characterize the time-varying behavior of cement paste under sulfate attack.
NETL
NSTL
万方数据
