ZHAO Hongliang1, MA Shibin1, YANG Zhiwei2, LIANG Dong1, JI Gangsheng1
(1.School of Civil and Transportation, Hebei University of Technology, Tianjin 300401, China;2.Tianjin Hengyishengtai Road Construction Material Technology Co., Ltd., Tianjin 300111, China)
Abstract: In order to provide decision-making basis for the construction plan of asphalt pavement, under different curing temperature conditions and the curing ages were 7, 14, 28, 42, 60, 90 d respectively, compressive strength of 4 kinds of lime fly ash stabilized macadam specimens were measured in the laboratory.Combining the activation energy relationship and the Nurse-Saul equation, 3 prediction models of the compressive strength of lime fly ash stabilized macadam specimens based on maturity were constructed respectively.Based on the data regression method and the results of scanning electron microscope, the prediction model was revised.The predicted values of the 3 models were compared with the measured values to verify the accuracy of the predicted models.The results show that the compressive strength of the lime fly ash stabilized macadam specimen is positively correlated with age and temperature.The effect of curing temperature is greater than the effect of curing age or the mass proportions of lime fly ash.The activation energy maturity equation can convert the actual curing ages at different temperatures into the equivalent ages at the standard temperature.It is convenient to predict but the prediction result has a large error.Under constant temperature conditions, the Nurse-Saul equation maturity method is closer to the actual value when predicting the early compressive strength, but the predicted valuesare slightly smaller than the actual values after the age of 14 d.Under variable temperature curing conditions, the approximate reference temperature needs to be set to 7 ℃.The Nurse-Saul equation maturity method predicts the compressive strength of the lime fly ash stabilized macadam specimen without interference from the lime fly ash massproportions, curing temperaturesor other factors, which has higher practicability.
Keywords: maturity; lime fly ash stabilized macadam; compressive strength; curing age；curing temperature
中图分类号： U416.1 文献标志码：A
文章编号：1008-5548(2022)01-0076-11
DOI:10.13732/j.issn.1008-5548.2022.01.009
收稿日期： 2021-05-08，修回日期：2021-11-02，在线出版时间：2021-12-02。
基金项目：国家自然科学基金项目，编号：51978236；天津市交通运输科技发展计划项目，编号：2019-08。
第一作者简介：赵宏良(1995—)，男，硕士研究生，研究方向为路基路面的材料与施工。E-mail：z185224561212@163.com。
通信作者简介：马士宾(1973—)，男，教授，博士，硕士生导师，研究方向为路基路面材料以及桥梁施工。E-mail：marotolo@hebut.edu.cn。
