摘要
通过压汞法、干湿循环腐蚀法分析不同类型混凝土孔结构与抗腐蚀性和强度的关系。试验结果表明:随着水胶比的降低,孔隙率降低,小孔增加,混凝土强度增大,对抗腐蚀性有利;与基准混凝土C40相比,在单掺矿物掺合料情况下,孔隙率降低,小孔增加,混凝土强度降低不明显,对抗腐蚀有利;引气剂增加了混凝土孔隙率及多害孔,混凝土强度有所降低,对混凝土抗腐蚀性不利;同时掺这两种物质时,虽增加了混凝土孔隙率,但可以使混凝土的孔径分布相对合理,混凝土强度有所降低,但对抗腐蚀性有利。
The mercury intrusion method and the dry wet cycle corrosion method are used to analyze the relationship of the different concrete pore structures and the corrosion resistance and strength. The test results show that the porosity is reduced, the small holes are increased and the concrete strength is increased with the reduction of water–binder ratio, which are favorable for the corrosion resistance. Compared with normal concrete C40, the mixing of mineral admixture will reduce the porosity, increase the small holes, but not obviously reduce the concrete strength, which are favorable for the corrosion resistance. The air entraining agent is used to increase the porosity and more-harmful hole of concrete and to reduce the concrete strength,but it is unfavorable for the corrosion resistance of concrete. At the same time to admix these two materials,the porosity is increased, but the pore size distribution of concrete can be relatively reasonable, and the concrete strength is reduced, but it is favorable for the corrosion resistance.
出处
《城市道桥与防洪》
2013年第11期159-161,5+4,共3页
Urban Roads Bridges & Flood Control
关键词
混凝土
抗硫酸盐侵蚀性能
耐久性
孔结构
引气剂
concrete
performance of sulfate attack resistance
durability
pore structure
air-entrained agent
