关键词: 道路工程;水泥稳定碎石;微裂技术;疲劳性能;自愈合

Abstract: For further consummating the theoretical basis of the microcracking technology of cement stabilized macadam base in the practical engineering application, a comprehensive and in-depth research on the fatigue performance of cement stabilized macadam after early damage and late self-healing has been conducted.Using vibration compaction meter, beam specimens of cement stabilized macadam were made and cracked with different degrees and time of microcracking.At the age of 90 d, the flexural strength and fatigue life of the cement stabilized macadam before and after microcracking were measured in the flexural strength test and the fatigue test, and the test results were analyzed.The changing rules of the fatigue life of the cement stabilized macadam''s early damage and self-healing after microcracking were researched and the microcracking fatigue equation of cement stabilized macadam was established by the Weibull distribution.The results show: the fatigue life of cement stabilized macadam presents a linear law of decrease with the increase of stress level both before and after microcracking;at the microcracking degree of 20％ and 30％, the fatigue life of cement stabilized macadam is basically the same with that without microcracking and at the degree of 40％ the fatigue life of cement stabilized macadam is relatively lower but still within the scope of the use requirement;the microcracking time has no significant influence on the results of fatigue test.

Key words: road engineering;cement stabilized macadam;microcracking technology;fatigue performance;self-healing