（西安理工大学土木建筑工程学院， 西安 710048）

［摘要］针对青海盐湖地区混凝土结构遭受氯盐的侵蚀破坏的情况，采用长期浸泡法研究了水泥基灌浆料在不同浓度（10%,15%,20%）NaCl溶液下的抗氯离子侵蚀力学性能，从强度耐蚀系数（抗折耐蚀系数、抗压耐蚀系数）及氯离子侵蚀深度两方面对水泥基灌浆料抗氯离子侵蚀性能进行了分析研究。试验结果表明，在相同浓度的NaCl盐溶液及水泥基灌浆料配合比下，水泥基灌浆料试件随着浸泡时间的增长，其抗折耐蚀系数和抗压耐蚀系数呈现出先缓慢增大后大幅度降低的趋势；随着NaCl盐溶液浓度的增加，浸泡9个月的水泥基灌浆料的抗压耐蚀系数降低了4-1%；水泥基灌浆料试件的氯离子侵蚀深度随浸泡时间的增加而增加，浸泡至9个月后，氯离子侵蚀速率减缓趋于稳定，试件氯离子侵蚀深度的增长率仅为2-6%。在此基础上，对抗氯离子侵蚀性能最好的NJ3试件在15%NaCl溶液下进行冻融循环试验，结果表明，随着冻融循环次数的增加，NJ3试件的氯离子侵蚀深度逐渐增加，在75次冻融循环后，氯离子侵蚀深度的增长速率有所降低，200次冻融循环试验之后，NJ3试件的氯离子侵蚀深度为4-35mm。

［关键词］水泥基灌浆料； 氯离子侵蚀； 力学性能； 耐蚀系数； 侵蚀深度

中图分类号：TU525文献标识码：A文章编号：1002-848X(2019)21-0108-06

Experimental study on mechanical properties of cement-based grouting material under chloridion corrosion

Kou Jialiang, Yu Danhong, Zhang Haobo

(School of Civil engineering & Architecture, Xi′an University of Technology, Xi′an 710048, China)

Abstract:In view of the corrosion damage of concrete structure in the Qinghai Salt Lake area, the long-term immersion method was used to study the chloridion corrosion resistance of cement-based grouting material in NaCl solutions with different concentrations (10%, 15% or 20%). Chloridion corrosion resistance performance of cement-based grouting material was analyzed in two perspectives of the strength corrosion resistance coefficient (flexural corrosion resistance coefficient and compressive corrosion resistance coefficient) and the chloridion corrosion depth. The experimental results show that under the same NaCl salt solution concentration and cement-based grouting material mix proportion, the flexural corrosion resistance coefficient and compressive corrosion resistance coefficient of cement-based grouting material specimens show a trend of slowly increasing first and then decreasing sharply with the increase of soaking time. With the increase of the concentration of NaCl salt solution, the compressive corrosion resistance coefficient of cement-based grouting material immersed for 9 months decreases by 4-1%.  The chloridion corrosion depth of cement-based grouting material specimens increased with the increase of soaking time,  the rate of chloridion corrosion slows down to be stable and the growth rate of chloridion corrosion depth of the specimens is only 2-6% after soaked for 9 months. On this basis, the NJ3 specimen with the best resistance to chloridion corrosion was subjected to freeze-thaw cycle test under 15% NaCl solution. The results show that the chloridion corrosion depth of NJ3 specimens increases gradually with the increase of the number of freeze-thaw cycles. After 75 freeze-thaw cycles, the growth rate of chloridion corrosion depth decreases. After 200 freeze-thaw cycles, the chloridion corrosion depth of the NJ3 specimen is 4-35 mm.

Keywords:cement-based grouting material; chloridion corrosion; mechanical property; corrosion resistance coefficient; corrosion depth

作者简介：寇佳亮，博士，副教授，Email：jialiangkou0918@163.com。