Rapid Curing Technology of Lime-Fly Ash Stabilized Macadam

Using the method of high temperature curing and standard curing, mechanical properties of lime-fly ash stabilized macadam were researched systematically through mix ratio test, compression rebound modulus test and cleavage strength test. First, relationship of strength growing laws for lime-fly ash stabilized macadam under conditions of high temperature curing and standard curing was obtained on regression analysis of the test results. Then, by using the relationship obtained, the strength of lime-fly ash stabilized macadam which was cured at standard temperature for 180 days, was determined from the test result of the lime-fly ash macadam which was cured at high-temperature for short age. Comparative analysis on microstructure of lime-fly ash stabilized macadam cured at high temperature and standard temperature was carried out by electron microscope scanning. The results show that, through high temperature curing, microstructure of lime-fly ash stabilized soil can be ameliorated. Early strength can be increased evidently, and therefore curing age can be shortened. Design parameters and major control indexes of ratio design for construction of lime-fly ash stabilized macadam can be confirmed rapidly. The contradiction between long curing age and construction time of the project using lime-fly ash stabilized soil can be solved.