寿光电厂钻孔灌注桩混凝土防盐卤水腐蚀试验研究

Experimental research on sulfate resistance of cast-in-place pile concrete of Shouguang Powerplant

寿光电厂处于地下水对混凝土具有中等-强腐蚀等级的地质条件,为了确保该工程设计桩基的耐久性,需要优选混凝土配合比。试验表明,在Cl-与SO42-共存的现场地下水环境下,混凝土受硫酸盐侵蚀的程度比在只有SO42-存在的环境中轻微;所试验的防腐剂对典型的C35钻孔灌注桩混凝土和C40高性能混凝土的抗硫酸盐侵蚀性能没有明显改善;使用抗硫水泥替代普硅水泥并没有明显地提高混凝土抗硫酸盐侵蚀能力;与典型的C35钻孔灌注桩混凝土相比,C40高性能混凝土具有更好的抗硫酸盐侵蚀性能。

The underground water in the construction site of Shouguang Power plant is classified as medium to high aggressive level for concrete.The mix proportion of the cast-in-place pile concrete should be optimized to ensure its durability in such geotechnical condition. According to experimental results, the aggressive effect of in-situ underground water with both Cl^- and SO4^2- on concrete was less than that of pure SO4^2- solution;The aggression resistant admixture selected for the test did not show obvious improvement on the sulfate resistance of typical C35 and high performance C40 concretes;Replacement of ordinary Portland cement with sulfate-resistant cement did not improve noticeably the resistance neither;C40 high performance concrete with 50% of fly ash and ground granulated blast furnace slag exhibited a better resistance than typical C35 concrete.