Study on Gradation of Cement Stabilized Macadam Mixtures Based on Crack Resistance
The poor crack resistance of cement stabilized macadam base is the essential cause of reflection cracks in asphalt pavements.This paper designed six gradations of the cement stabilized macadam mixture,and the optimum water content and maximum dry density were determined by heavy compaction tests.The unconfined compressive strength,flexural strength,compressive resilience modulus,and dry shrinkage coefficient of each mixture specimen were measured.The comprehensive"crack resistance index"was established to evaluate the crack resistance of the cement stabilized macadam base,and the effect of the gradation on the"crack resistance index"of the cement stabilized macadam mixture was analyzed.This study has a certain guiding significance for improving the crack resistance of cement stabilized macadam bases.
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