不同盐腐蚀环境下混凝土孔结构研究

采用压汞法测试硬化后混凝土的孔结构参数,以不同腐蚀环境下腐蚀前后混凝土的孔结构为研究对象,以基准混凝土作对比,研究了矿物掺合料对混凝土孔结构及其抗腐蚀性能的影响,探讨混凝土在不同盐腐蚀环境下孔结构在腐蚀前后的关系。结果表明:掺入粉煤灰和磨细矿渣或提高掺量均减小了混凝土的最可几孔径,改善了孔结构分布。不同腐蚀环境下,氯盐环境下腐蚀后的总孔隙率等孔结构参数小于复合盐环境下的,模拟海水环境下的最大。随着腐蚀龄期的增长,有害孔百分比增加速率最大。

Pore structure of the concrete under the different salt corrosive environment

Using mercury intrusion method to measure the parameter of concrete pore structure system, making the concrete pore structure before and after corrosion in different corrosive environment as the research object, Study the influence of mineral admixtures to concrete pore structure and corrosion resistance property contrasting compared with normal concrete. The test results show that mixing fly ash and slag powder or improving the mixed amount can reduce the most probable pore size of concrete, improve the distribution of pore structure, in different corrosive environment, total porosity of concrete during chlorine salt environment is less than that under the composite salt environment, and that under the simulated seawater environment is largest. Along with the growth of the corrosion age, the increase rate of harmful pore percentage is biggest.