中外公路2025，Vol.45Issue(3)：25-36,12.DOI:10.14048/j.issn.1671-2579.2025.03.004
沥青混合料低温半圆弯曲试验评价指标研究
Research on Evaluation Index of Low-Temperature Semi-Circular Bending Test of Asphalt Mixtures
摘要
Abstract
This article aims to investigate the low-temperature crack resistance performance of asphalt mixtures under different aging conditions and loading rates and select appropriate indicators to accurately characterize and quantify their performance.Based on the semi-circular bending test,the influence of different aging degrees(unaged,short-term aged,long-term aged for three days,and long-term aged for five days)and loading rates(50 mm/min,5 mm/min,0.5 mm/min,and 0.1 mm/min)on the low-temperature performance of asphalt mixtures was investigated.The evaluation effect and applicable range of five crack resistance performance indicators,namely fracture energy(Gf),stress intensity factor(KIC),flexibility index(IFI),crack resistance index(ICRI),and balanced cracking index(IBCI),were studied through variance analysis and variability analysis.The results indicate that aging significantly decreases the low-temperature performance of asphalt mixtures.After short-term aging,Gf decreases by approximately 26%,and as the degree of aging deepens,it continues to decrease at an attenuation rate of about 3%.As the loading rate increases,the evaluation effectiveness of IFI and IBCI deteriorates.Conducting the semi-circular bending test at a loading rate of 0.1 mm/min provides a more comprehensive evaluation of the low-temperature performance of asphalt mixtures.The results of variance analysis and variability analysis indicate that Gf and ICRI can significantly characterize the influence of aging and loading rate on the low-temperature performance of asphalt mixtures.The variability of IFI and IBCI is significantly higher than that of the other three indicators.Hence,it is recommended to adopt Gf and ICRI from the semi-circular bending test as more reasonable indicators for evaluating the low-temperature performance of asphalt mixtures.关键词
沥青混合料/半圆弯曲试验/低温性能/断裂能/抗裂指数/变异系数Key words
asphalt mixture/semi-circular bending test/low-temperature performance/fracture energy/crack resistance index/coefficient of variation分类
交通工程引用本文复制引用
吕松涛,陈淇,鲁巍巍,赵霈,王金平..沥青混合料低温半圆弯曲试验评价指标研究[J].中外公路,2025,45(3):25-36,12.基金项目
国家自然科学基金资助项目(编号:52225806,52078063) （编号:52225806,52078063）
