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为了确定盐渍土强腐蚀环境下桩基混凝土强度等级,采用硅酸盐水泥和高抗硫酸硅酸盐水泥制备了两组(C40和C50)混凝土进行试验,考察了不同强度等级混凝土抗硫酸盐和抗氯离子的侵蚀能力。结果表明,在浸烘循环试验制度下,C50与C40抗压强度耐蚀系数差异不大;在浸泡试验制度下,砂浆试件的膨胀系数随强度等级的升高而减小,而强度等级对砂浆的抗折强度抗蚀系数影响不大;混凝土抗氯离子侵蚀能力随强度的增高而增强。综合考虑混凝土技术经济性能和施工质量控制水平,对于硫酸盐和氯盐共存环境下的桩基混凝土,建议采用C40高性能混凝土。
In order to determine the strength level of pile foundation concrete under the strong corrosive environment of saline soil, two sets of concrete (C40 and C50) were prepared by using Portland cement and high anti-sulfate silicate cement. The effects of different strength grade concrete on sulfate resistance And resistance to chloride ion erosion. The results show that the corrosion resistance coefficient of compressive strength of C50 and C40 is not different under the immersion drying cycle test system. Under the immersion test, the expansion coefficient of mortar specimen decreases with the increase of strength grade, while the strength grade The flexural strength of mortar has little effect on the corrosion resistance; the ability of concrete to resist chloride ion corrosion increases with the increase of strength. Considering the technical and economical performance of concrete and the quality control of construction, C40 high-performance concrete is recommended for the pile-based concrete under the coexistence of sulfate and chloride salts.