（1 西安理工大学土木建筑工程学院， 西安 710048；2 西安理工大学省部共建西北旱区生态水利国家重点实验室， 西安 710048）

［摘要］青海盐湖地区的建筑物长期遭受氯离子的侵蚀及季节性冰冻破坏，通过试验，研究了不同配合比水泥基灌浆料在不同NaCl溶液浓度（10%，15%，20%）下的抗冻融侵蚀性能，并探讨水泥基灌浆料外观形态、质量损失率和强度损失率的变化。试验结果表明：氯离子和冻融侵蚀共同作用下对水泥基灌浆料的破坏大于单一冻融作用下的破坏；在一定的氯离子浓度范围内，随NaCl溶液浓度的增加，试件的抗冻性能降低；而高浓度的NaCl溶液可以有效降低水的冰点，提高其抗冻性能；掺入适量的矿物掺合料，水泥基灌浆料可展现出良好的抗冻性能。为将水泥基灌浆料推广到氯离子和冻融侵蚀共同作用下的实际工程中提供可靠的理论试验依据。

［关键词］水泥基灌浆料； 氯离子侵蚀； 冻融侵蚀； 抗冻性能；  抗压强度； 抗折强度

中图分类号：TU525文献标识码：A文章编号：1002-848X(2020)15-0100-06

Experimental study on mechanical properties of cement-based grouting material under the joint action of chloride ion and freeze-thaw erosion

KOU Jialiang1,2, HU Jinbo1, MA Ming1, YU Danhong1

（1 School of Civil Engineering and Architecture,Xi′an University of Technology,Xi′an 710048, China； 2 State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi′an University of Technology,Xi′an 710048, China）

Abstract:The buildings in the Saline Lake area of Qinghai have been subjected to chlorine ion erosion and seasonal frost damage for a long time.Through experiments,The freezing-thaw erosion resistance of cement-based grouting material with different mix ratios under different NaCl solution concentrations(10%,15%,20%)was studied,and the changes of appearance,quality loss rate and strength loss rate of cement-based grouting material were discussed.The tests result show that the damage of the cement-based grouting material under the joint action of chloride ion and freeze-thaw erosion is greater than that under the single freeze-thaw action.In a certain range of chloride ion concentration,with the increase of NaCl solution concentration, the frost resistance of the test piece decreases.While the high concentration NaCl solution can effectively reduce the freezing point of water and improve its frost resistance.Incorporating an appropriate amount of mineral admixture,cement-based grouting material can exhibit good frost resistance.It provides a reliable theoretical test basis for extending the cementbased grouting material to the practical engineering under the joint action of chloride ion and freeze-thaw erosion.

Keywords:cement-based grouting material;   chloride ion  erosion;  freeze-thaw erosion; frost resistance; compressive strength; flexural strength

*国家自然科学基金资助项目(51408487)，陕西省自然科学基础研究计划项目（2020JM-454）。

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