MA S B, ZHAO H L, QING L B, et al.Determination method of micro-crack time of cement stabilized macadam based on maturity[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(4):179-187.

doi:10.16186/j.cnki.1673-9787.2021100046

Received:2021/10/20

Revised:2021/12/27

Published:2023/07/25

Determination method of micro-crack time of cement stabilized macadam based on maturity

MA Shibin, ZHAO Hongliang, QING Longbang, HE Miao

School of Civil and Transportation，Hebei University of Technology，Tianjin 300401，China

Abstract:To determine the micro-crack time of cement stabilized macadam，a great deal of indoor tests were carried out for the microcracking technique of cement stabilized macadam，and the relationships between the micro-crack time，micro-crack degree and the recovery degree of unconfined compressive strength after microcracking were studied.Combined with maturity theory，the prediction model of early unconfined compressive strength of cement stabilized macadam was obtained by fitting the test data，on this basis，the variation law of the recovery degree of cement stabilized macadam after micro-crack with the maturity before micro-crack was obtained.Then，the internal structure of cement stabilized macadam with different maturity was observed and analyzed by using computed tomography（CT）.Finally，the accuracy of the prediction model was verified by tests.The results showed that the recovery degree of unconfined compressive strength of cement stabilized macadam decreased with the increase of microcrack degree.The unconfined compressive strength prediction model based on maturity method had a good fitting degree.The method of determining the micro-crack time by maturity was more accurate than the current time divided by day，and could be flexibly adjusted according to the actual situation of the project.The best micro-crack degree was 30%，and the best micro-crack time was when the maturity reached 1 434 K·h.The autogenous self-healing of the internal structure of the micro-cracked cement stabilized macadam was different at different maturity.

Key words:cement stabilized macadam;micro-cracking technique;self-healing;maturity;strength model

基于成熟度的水泥稳定碎石微裂时间确定方法_马士宾.pdf