Life reliability evaluation of natural pumice concrete under ice abrasion
WANG Xiaoxiao1,2,3, GAO Yutao1, JING Lei1,2,3*, LIU Shuguang3,4, YAN Changwang3,4, JIANG Lin1
1. School of Civil Engineering, Inner Mongolia University of Technology, Hohhot, Inner Mongolia 010051, China; 2. Key Laboratory of Civil Engineering Structure and Mechanics, Inner Mongolia University of Technology, Hohhot, Inner Mongolia 010051, China; 3. Inner Mongolia Engineering Research Center of Ecological Building Materials and Prefabricated Construction, Hohhot, Inner Mongolia 010051, China; 4. School of Mining and Technology, Inner Mongolia University of Technology, Hohhot, Inner Mongolia 010051, China
Abstract：This paper designed an accelerated ice-natural pumice concrete reciprocating sliding wear test under various test conditions, tested the accumulated wear of natural pumice concrete under various wear paths, and performed life reliability modeling based on the Weibull distribution to investigate the service life of natural pumice concrete during the flowing period. The least square estimation and the best linear unbiased estimation methods were respectively, used to estimate the various para-meters. The experimental results demonstrate that the reliability curves based on the Weibull distribution effectively describes the accelerated failure process of natural pumice concrete under the influence of ice abrasion. The reliability curves of natural pumice concrete have a three-stage distribution that is monotonically decreasing, and its wear resistance degrades most noticeably in the accelera-ted damage stage; among the two types of methods, the shape parameter values fluctuate most by the influence of the method, and at the early stage of reliability decline, the reliability life calculated by the least square estimation is smaller than that calculated by the best linear unbiased estimation me-thod; the reliability life of natural pumice concrete under the reliability of 0.5 is selected as the life of natural pumice concrete under the action of ice wear, which will provide a theoretical reference for improving the wear resistance and safety of natural pumice concrete.
