Fatigue cracking checking of cement stabilized macadam based on measurement uncertainty and interval analysis

The discreteness of fatigue test results of inorganic bonded stabilized materials is very voluminous. In this study, the fatigue crack checking process of cement stabilized macadam is analyzed by using measurement uncertainty and interval analysis theory in order to improve the efficiency of fatigue test data. Firstly, the measurement uncertainty of the bending strength and fatigue life of cement stabilized macadam is evaluated based on the measurement uncertainty theory. Secondly, the regression analysis of the fatigue life interval of different stress ratio conditions is realized, following which the regression model of the fatigue life interval of cement stabilized macadam is derived. Finally, the calculation model of fatigue cracking life interval is deduced, and the fatigue cracking life interval of cement stabilized macadam is then obtained by interval algorithm. Meanwhile an evaluation method of interval comparison results is proposed in order to undertake a comparative analysis of the fatigue cracking life interval of cement stabilized macadam. According to the findings, the non-uniformity of the specimen is determined as the root cause of the large discreteness of fatigue test results. A fatigue interval model with 95% guarantee rate can be obtained based on the regression analysis method of fatigue life interval, which is proved to be effective in improving the efficiency of fatigue test data. There is a case of interval expansion in calculating the equation of fatigue cracking life interval. It is verified that the extended interval result has engineering applicability. Therefore, it can be surmised that the interval result comparison method proposed in this paper can achieve both quantitative and qualitative evaluation, which is particularly suitable for the engineering field of interval analysis.