摘要
通过将粉煤灰和高炉矿渣2种工业废渣采用单掺、混掺的方式添加至水泥稳定碎石中进行改良,基于无侧限抗压强度、劈裂抗拉强度、干缩及疲劳等室内试验,系统研究了粉煤灰与高炉矿渣对水泥稳定碎石基层材料性能的影响规律,研究表明:水泥稳定碎石的力学强度随着养护龄期的增长逐渐增大,而干缩系数则随之呈先增大后减小;单掺粉煤灰或高炉矿渣均能提升水泥稳定碎石的力学强度、干缩特性以及疲劳寿命,粉煤灰改良水泥稳定碎石仅后期劈裂抗拉强度和干缩特性优于高炉矿渣,而其他性能指标则较之表现要差;由于粉煤灰与高炉矿渣复掺能够充分发挥两者的填充、滚珠及二次火山灰等效应,因此复合改良水泥稳定碎石综合性能表现最优,通过综合考虑推荐采用2%的粉煤灰与4%高炉矿渣进行复掺改良,有利于提升水泥稳定碎石的使用性能及寿命。
Two kinds of industrial waste slag,fly ash and blast furnace slag,were added to cement stabilized crushed stone by single mixing and mixing.Based on laboratory tests such as unconfined compressive strength,split⁃ting tensile strength,dry shrinkage and fatigue,the influence of fly ash and blast furnace slag on the properties of ce⁃ment stabilized crushed stone base material was systematically studied.The results show that the mechanical strength of cement stabilized crushed stone increases with the increase of curing age,while the dry shrinkage coeffi⁃cient increases first and then decreases.Single addition of fly ash or blast furnace slag can improve the mechanical strength,dry shrinkage characteristics and fatigue life of cement stabilized crushed stone.Fly ash improved cement stabilized crushed stone only has better splitting tensile strength and dry shrinkage characteristics than blast furnace slag in the later stage,while other performance indicators are worse than performance.Because the compound addition of fly ash and blast furnace slag can give full play to the filling,ball and secondary pozzolanic effects of the two,the comprehensive performance of the composite modified cement stabilized macadam is the best.By compre⁃hensive consideration,it is recommended to use 2%fly ash and 4%blast furnace slag for compound addition and improvement,which is conducive to improving the performance and service life of cement stabilized macadam.
作者
王一
WANG Yi(Yuzhou Highway Maintenance Engineering Co.,Ltd.,Xuchang 461670,Henan China)
出处
《粘接》
2025年第10期94-97,共4页
Adhesion
关键词
工业废渣
水泥稳定碎石
力学强度
干缩特性
疲劳寿命
industrial waste residue
cement stabilized crushed stone
mechanical strength
dry shrinkage charac-teristics
fatigue life
