Characteristics Of Fly Ash And Soil Mechanics Experimental Study On Freezing Resistance

At the conclusion of this article our predecessors on the fly on the basis of soil, fly ash soil dynamic, static and frost to carry out special studies.Specific studies include the following aspects:1. The use of the road strong instrument measuring water content of fly ash in different soil and lime-soil parameters than the static.2. The use of dynamic triaxial measurements of fly ash soil dynamic parameters.3. Laboratory test measuring the water content of fly ash and lime on the soil than the impact of the frost heaveIn this paper, unconfined compressive strength test of fly ash in different soil and lime-soil water content than the static measurement parameters; followed by the use of dynamic elastic modulus and in the destruction of soil = 10 weeks of dynamic shear body strength parameters for the main driving force, through the preparation of fly ash on indoor soil samples of different dynamic triaxial confining pressure test, the specimen measured dynamic elastic modulus and sample a few weeks in the destruction of soil = 10 anti-body dynamic shear strength. From the effects of frost heave of soil factors begin to study the water content of fly ash and lime on the soil than the effect of frost heave.Mainly carried out on the fly-ash soil unconfined compressive strength tests and dynamic triaxial tests measuring the dynamic properties of fly ash and soil water content, lime-fly ash ratio of the impact of soil frost heaving test, the following majorconclusions:1. Fly-ash soil (1:2) to increase the compressive strength changes with water content gentle, lime at 15% ~ 23.5% moisture content within the scope of the compressive strength greater than 150kPa. Water content in the best until the compressive strength of fly ash with soil water content changes in the level of moisture content than after the best. Note the performance of fly ash stabilized soil water is better able to withstand a variety of changes in natural conditions, to meet the use of Subgrade requirements, the nature of the works is a good filler, it is worth to promote the use of.2. Fly-ash soil (1:2) at different moisture damage under the strain did not change significantly, numerical size of close to 5%. 3. Fly-ash soil (1:2) of the deformation can be reduced with the increase in water content, when the water content from 15% to 19% changes, the deformation modulus of 28.67 percent lower; when the water content from 19% to 23.5% change , gentle curve, the deformation modulus of only 7.39 percent lower. Which shows that fly-ash soil (1:2) in water content is greater than the best, the deformation modulus changes with the water content was less, but the deformation modulus is greater than both 3Mpa.4. Lime-soil water content under different ratio of 1:4,1:2 and 1:1 are the compressive strength increases with decreasing water content. Water content of less than optimum water content, the compressive strength variation with water content; when the water content when water content is greater than the best water content changes with the gentle strength. However, fly ash: soil = 1:2 the compressive strength is higher than the other two cases. Water content = 17% = 23.5% and deformation modulus of fly ash content increased with the decrease; the best water content = 19%, the ash: soil = 1:2 deformation modulus less than the other two Mix. Fly ash content on the fly-ash soil deformation modulus greater impact.5. The use of non-repeated two-way ANOVA of the characteristics of fly ash soil factors, water content of fly ash derived soil significantly affect the compressive strength, lime-fly ash than the compressive strength of soil affect the more significant; lime powder than for ash soil deformation modulus did not affect water content of fly ash soil deformation modulus significantly affected.6. With the increase in fly ash content to reduce the amount of frost heave. 1:1 lime than the minimum amount of frost heave, lime-soil ratio of 1:4, when the largest amount of frost heave. Contrast curve slope, the frost heave test began, the rapid increase in frost heave rate curve tends to slow, that is, reaching a stable value of the rate of frost heave.7. The same lime-soil water content than the different amount of frost heave with increased water content. The same as the freezing temperature, with increasing soil moisture content increased the amount of frost heave, frost heave increased; fly ash soil frost early in the cooling (fly ash in the process of phase change of water) the most strongly, then dropped with the temperature gradually become more stable, even when small water shrinkage phenomenon, that is, when the temperature is low, frost heave and shrinkage gradually achieve a balance; frost heave volume and water content are clearly related on the higher water content, freeze The greater the volume expansion.