Study On The Effect And Mechanism Of Mte Series Soil Stabilizers Treating The Loess Soil Of Zhuanghe

Soil stabilizer is a kind of soil modifying agent which can improve the physical and chemical properties of soil significantly. The ionic soil stabilizer is the most typical one of them and it has been widely used to reinforce soil due to its low dosage, convenient to use and the strong ability to adjust the soil.In order to analysis the curing mechanism and the curing effect of Mte-3, Mte-7 inorganic ionic soil stabilizers prepared by Mountain Tai company,we set the loess of Zhuanghe County. Dalian City as the research object and explore the application performance of Mte solidified loess in Liaoning province.Firstly, we analyzed the basic parameters of the loess taken from Zhuanghe County by the standard civil engineering experiment, including test of the natural moisture content of loess by using oven-drying, tested loess particle size distribution by using sieve analysis method, tested liquid limit, plastic limit and plasticity index of the loess by using liquid-plastic limit combined measurement and tested the optimum water content and maximum dry density of loess by using standard compaction test. Through testing the soil particle size, the result shows that the loess in Zhuanghe County of Dalian is well graded gravel. Through soil engineering classification test, the result shows that the loess in Zhuanghe County of Dalian is low liquid limit clay, loess in Zhuanghe County of Dalian is suitable to apply to construction engineering.Secondly, in order to determine the reinforcement effect of each stabilizer on loess, we carried out three point bending strength experiment and unconfined compression strength experiment on solidified soil test block treated with Mte series stabilizer and cement. According to the experimental results, both of them must consolidate soil with cement, and the solidifying effect of Mte-7 is more excellent than Mte-3’s.Lastly, we analyzed the mechanism of the solidified loess by using XRD diffraction analysis, scanning electron microscope analysis and ZETA-dynamic electric potential test:For Mte-3 soil stabilizer, by comparing the XRD result of the stabilized soil by Mte-3 compared with cement and the original soil, the former do not have the spectrum peaks of the 2-theta equals 12.450 and 31.515. The spectrum peak of 2-theta equals 12.450 is sodium aluminosilicate’s characteristic peak and the spectrum peak of 2-theta equals 31.515 is Yili stone’s characteristic peak. By comparing the scanning electron micrographs of stabilized soil by Mte-3 and cement with the scanning electron micrographs of original soil, the flocculation structure and hook structure formed in the former sample particle surface. According to the results of ZETA-electric potential, the colloid particles’ particle size of Mte-3 and cement solidified soil were significantly decreased compared with that of the original soil. The mechanism of Mte-3 solidifying soil and improving the strength of solidified soil is effect of the chloride of sodium chloride in Mte-3. the chloride ion can enhance the early strength of soil and promote the ion exchange between high valence cation in cement and low valence cation in soil, so as to strengthen the soil by decreasing particle size of soil colloid and forming a hard shell covered on the surface of soil colloid with cement hydration.For Mte-7 soil stabilizer, by comparing the XRD result of the stabilized soil by Mte-7 compared with cement and the original soil, the former do not have the spectrum peaks of the 2-theta equals 44.143,2-theta equals 53.937 and 2-theta equals 31.515. The former have the new spectrum peaks of the 2-theta equals 53.890. The spectrum peak of 2-theta equals 44.143 and 58.937 is calcium acetate’s characteristic peak, the spectrum peak of 2-theta equals 31.515 is Yili stone’s characteristic peak and the spectrum peak of 2-theta equals 53.890 is ferric oxide’ characteristic peak. According to the result of the scanning electron micrographs, the solidified soil samples preparead by Mte-7 and cement the mesh structure formed on the surface of sample and the small particles are uniformly and neatly inlaid in the grid structure, and the whole structure is in a three-dimensional state. According to the results of ZETA-electric potential, the colloid particles’ particle size of Mte-7 and cement solidified soil were significantly decreased compared with that of the original soil. So there are two mechanisms of Mte-7 solidifying soil, The first one is same with Mte-3 because Mte-7 aslo contain the sodium chloride; The second mechanism of Mte-7 increasing the strength of soil is the effect of oxidizing the organic material to produce gas and scatter the soil by Mte-7’s potassium ferrate component, which can increase the contact area between soil grains and cement hydration which can form network structure around the soil particles by the cement solidified matter.