Experimental Research on Durability of Concrete Made by Seawater and Sea-Sand

This paper introduce a series of tests about properties of seawater and sea-sand concrete, such as impermeability, dry shrinkage, alternate wetting and drying destruction and sulfate attack. The test results show that the impermeability of seawater and sea-sand concrete and ordinary concrete is basically same, the coral sand leads to decreasing of concrete impermeability, the admixture can effectively improve the impermeability of coral sand concrete. The difference between the shrinkage rate of seawater and sea-sand concrete and the ordinary concrete is not obvious, the shrinkage rate of seawater and coral-sand concrete is larger than ordinary concrete, and the admixtures can effectively inhibit the late drying shrinkage of seawater and sea-sand concrete and seawater and coral-sand concrete. In the case of alternate wetting and drying, the pressure generated by the salt crystals would not damage seawater and sea-sand concrete. Potential sulfate attack exits in seawater and sea-sand concrete, the active admixture is able to greatly enhance its ability of resisting sulfate corrosion.