Study on Mechanical Properties and Microstructure of Concrete in Sulfate Environment

This paper describes a study carried out to examine the performance of various high performance minute stone concrete,they are made up of compound admixtures,riddled sand,minute stone,portland cement concrete and resist-sulfur cement concrete.They experienced 100 dry-wet cycle in sodium sulfate solution.The parameters in the durability performance of concrete were the flexural strength and the compressive strength.By analyzing the SEM of concrete,the test result show composite additive can happen the second hydratation to disadvantage component Ca(OH)2 inside concrete,and build advantaged C-S-H gel to reform the microstructure of concrete effectively.And that improve the repellence of concrete to sulfate environment.