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Na Cl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。
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%Na Cl 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.
作者
寇佳亮
于丹红
张浩博
Kou Jialiang;Yu Danhong;Zhang Haobo(School of Civil engineering&Architecture,Xi'an University of Technology,Xi'an 710048,China)
出处
《建筑结构》
CSCD
北大核心
2019年第21期108-113,共6页
Building Structure
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
cement-based grouting material
chloridion corrosion
mechanical property
corrosion resistance coefficient
corrosion depth
