海砂混凝土抗硫酸盐侵蚀性能研究

STUDY OF THE RESISTANCE TO SULFATE ATTACH OF CONCRETE MADE WITH DREDGED MARINE SAND

采用淡化海砂、原状海砂和河砂分别配制了强度等级为C30和C50的普通混凝土,通过硫酸盐干湿循环试验,对比研究了采用不同砂配制的混凝土抗硫酸盐侵蚀性能。结果表明:在硫酸盐侵蚀作用下,混凝土质量损失率的大小与其表面劣化的程度相关,但并不能有效评价混凝土抗硫酸侵蚀能力;混凝土强度等级相同时,淡化海砂混凝土的抗硫酸盐侵蚀能力略好于河砂和海砂混凝土;原状海砂引入的氯离子对混凝土抗硫酸盐侵蚀有一定的不利影响。

In this study, the C30 and C50 ordinary concretes were prepared with washed dredged sand , and unwashed dredged marine sand .Compared to concrete made with river sand , the resistance to sulfate attack of the above concretes was studied by dry-wet cycle test .The results show that the mass loss of the concrete under sulfate attack is related to the surface deterioration .In terms of the same strength grade , the sulfate attacking resistance of washed dredged sand concrete is better than that of the concrete made with river sand .In addition, the chloride from the unwashed dredged sand affects negatively on the resistance to sulfate attack of concrete .