中外公路2025，Vol.45Issue(1)：31-41,11.DOI:10.14048/j.issn.1671-2579.2025.01.004
变温变湿条件下早强水泥稳定碎石的断裂性能
Cracking Characteristics of Cement-Stabilized Macadam with Early Strength Agent under Variable Temperature and Humidity Curing Conditions
摘要
Abstract
In environments with large temperature variations and low humidity,the curing conditions of cement-stabilized macadam fail to meet the specifications,leading to slow early strength development and increased susceptibility to cracking.This study aimed to investigate the effects of actual environmental temperature,humidity,curing age,and addition of early strength agents on the cracking characteristics of cement-stabilized macadam.Variable temperature conditions were determined based on actual environmental temperature data.Four curing conditions were set by combining temperatures(variable temperature and standard temperature)with relative humidity of 95%,80%,and 65%,respectively.Three types of specimens were prepared with 0%,10%,and 15%early strength agent contents and cured for 14 and 28 days,respectively.The cracking characteristics of the specimens were evaluated through splitting tensile strength tests,four-point bending flexural strength tests,four-point bending flexural modulus tests,and semi-circular bending tests.The results show that under variable temperature conditions,the cracking characteristics of cement-stabilized macadam,including strength,rigidity,and toughness,are lower than those under standard temperature conditions.Among them,the decrease in splitting fracture work is the most significant at 31.74%,while the reduction in flexural modulus is the smallest at 8.60%.Lower curing humidity indicates an increased susceptibility of cement-stabilized macadam to cracking.The incorporation of early strength agents can mitigate the negative effects of curing conditions.Scanning electron microscope(SEM)observations reveal that variable temperature or lower humidity reduces the degree of cement hydration,while the addition of early strength agents enhances it.Based on correlation and reliability analysis,the four-point bending test is recommended for assessing the cracking characteristics of cement-stabilized macadam.关键词
水泥稳定碎石/断裂性能/早强剂/变温变湿养生/相关性分析Key words
cement-stabilized macadam/cracking characteristic/early strength agent/variable temperature and humidity curing/correlation analysis分类
交通工程引用本文复制引用
葛冬冬,刘定远,吕松涛,姜向阳,薛艳华,于洋..变温变湿条件下早强水泥稳定碎石的断裂性能[J].中外公路,2025,45(1):31-41,11.基金项目
国家自然科学基金资助项目(编号:52108398) （编号:52108398）
