阿克苏地区盐渍土环境下混凝土耐久性研究

Study on Durability of Concrete under Saline Soil Environment in Aksu Area

在南疆阿克苏地区选取试验地点并设计试验方案,对不同矿粉掺量的混凝土试块进行现场暴露试验,分析南疆盐渍土环境下现场暴露的混凝土基于硫酸盐侵蚀的试验数据,结合当地实际环境和材料因素,选取试件的相对动弹性模量和相对质量作为评价参数。最终再选用综合评定参数对混凝土在盐渍土环境作用下的损伤过程进行评判,确定矿粉的最佳掺量。理论分析和试验结果表明,室外现场暴露试验混凝土在盐渍土环境中发生了复杂的化学反应,在矿粉掺量为30%时综合损伤评价参数波动最小,说明矿粉掺量30%为最佳掺量,此时混凝土耐久性最好。

In Aksu area of Southern Xinjiang, the test site is selected and the test scheme is designed. The field exposure test of concrete blocks with different mineral powder contents is carried out. The test data of concrete exposed in the saline soil environment of Southern Xinjiang based on sulfate erosion are analyzed. Combined with the local actual environment and material factors, the relative dynamic elastic modulus and relative quality of the specimens are selected as the evaluation parameters. Finally, comprehensive evaluation parameters are selected to evaluate the damage process of concrete under the action of saline soil environment and to determine the optimal content of mineral powder. Theoretical analysis and test results show that complex chemical reactions take place in the salinized soil environment of concrete exposed to outdoor field test. When the ore powder content is 30%, the parameter fluctuation of comprehensive damage evaluation is the smallest, indicating that the ore powder content is 30%, and the concrete durability is the best.