Experimental Study On Evolution Under Freeze-thaw Conditions Mechanical Properties Of Cement Stabilized Macadam

Since the cement stabilized macadam base with a good overall stability and durability, high strength and load-bearing capacity and other characteristics,now widely used in China’s highway construction. Each grade highways in China has completed the construction of more than 90% is used in lime, fly ash and cement stabilized material is semi-rigid material represented as road base material. But cement stabilized gravel stratum there are also some disadvantages difficult to overcome: for example, the sensitivity of overloading, poor drainage, easy to shrinkage cracking, surface easy scouring. Seasonal Frozen northern region has a long-time annual low, long and cold winter, summer and winter dramatic changes, sooner or later, large temperature difference between climate characteristics, such climatic conditions not conducive to the region for the use of cement stabi lized gravel road base material. Cement stabilized base in winter and spring thaw often in a freeze-thaw cycle of state. so this paper carries research on cement stabilized macadam base in the region in the mechanical behaviors of freezing and thawing cycles.This article adopts relevant tests, reference highway engineering stable inorganic binder binder testing procedures, specimen preparation and health, were freeze-thaw cycles, and measuring the changes in the mechanical properties of the material after the freeze-thaw cycle. Processed and analyzed experimental data obtained study the mechanical properties of variation. Further research on the mechanical properties of the pavement structure change. The specific work includes the following:Cement stabilized macadam changes of under freezing and thawing. From the raw material of cement stabilized macadam determine the technical nature of the start, to determine the optimum moisture content and maximum dry density and to determine the dose of cement. Preparation and health with cylindrical specimens carried out freeze-thaw cycle test. Resilient modulus to the top surface of the material and method to determine the split test, and the test results for analysis and processing, find out the variation.The impact of freezing and thawing cycle fatigue properties of cement stabilized macadam. Preparation and health cement stabilized gravel materials beam specimens carried out freeze-thaw cycle test. After a predetermined number of times to freezing and thawing, bending strength of the test material, based on fatigue test material. Analysis and experimental data obtained are summarized in cement stabilized gravel material changes in different freeze-thaw cycles of fatigue life, fatigue equation obtained under different guaranteed rate.Effect of freeze-thaw cycles of cement stabilized base layer of gravel pavement structure. Based on previously obtained cement stabilized macadam compressive resilient modulus and splitting strength at different freeze-thaw cycles role. By means of pavement structural analysis software process-related data. Mechanical properties of various structural changes in the pavement layers bottom affect tensile stress and further analysis of the impact on the entire pavement structure brought.