高性能同步注浆材料的耐久性与抗水分散性能研究

Research on durability and water dispersibility of high performance shield grouting material

通过硫酸盐侵蚀深度、抗水渗透压力及电通量表征注浆材料耐久性能,采用水陆强度比表征注浆材料的抗水分散性能。研究了配合比参数及功能性复合掺合料对注浆材料耐久性及抗水分散性能的影响,并探究了试验方法的可行性。研究结果表明,水胶比的降低可提高注浆材料的耐久性能,提高注浆材料的抗水分散性能,降低膨润土掺量同时掺入一定比例的功能性复合掺合料,可进一步提高注浆材料的耐久性能及抗水分散性能。硫酸盐侵蚀深度更适用于掺膨润土的传统注浆材料抗硫酸盐侵蚀性能的表征,对于不掺膨润土的高性能注浆材料的抗硫酸盐侵蚀性能表征不明显。采用测试混凝土与注浆材料的结合体电通量的方法可用于对比注浆材料电通量的差异,但很难表征注浆材料本体的抗氯离子渗透性能。

The durability of the grouting material was characterized by the depth of sulfate attack,water penetration pressure and electric flux,and the water-land strength ratio was used to characterize the water dispersion resistance.The effects of mixing ratio parameters and functional compound admixture on the durability and water dispersion resistance of grouting materials were studied,and the feasibility of the test method was explored.The results show that decreasing the water-binder ratio can improve the durability of the grouting material,improve the water-dispersion resistance of the grouting material.The durability and water dispersion resistance of the grouting material can be further improved with decrease of the content of bentonite and increase of a certain proportion of functional composite admixture.The sulfate attack depth is more suitable for the characterization of the sulfate attack resistance of the traditional grouting material with bentonite,but not for the high performance grouting material without bentonite.The method of measuring the electric flux of combination of concrete and grouting material can be used to compare the difference of electric flux of grouting material,but it is difficult to characterize the resistance of grouting material to chloride ion penetration.