摘要
为了研制一种轻质沥青混凝土,采用轻质页岩与玄武岩的混杂碎石制备轻质高模量沥青混合料。通过3 h车辙试验、低温小梁弯曲试验、浸水马歇尔试验和冻融劈裂试验,研究了轻质页岩碎石对沥青混合料路用性能的影响规律,并对40%轻集料体积替代率下混合料的动态模量和疲劳性能进行了试验研究。结果表明:随着轻质页岩碎石掺入比例的提高,轻质高模量沥青混合料的高温稳定性和水稳定性没有降低,而低温弯曲性能随着轻集料掺量的增加先提高后降低;当轻质页岩碎石的体积替代率为20%时,沥青混合料的路用性能最佳。与常规高模量沥青混合料相比,40%轻集料体积替代率的沥青混合料在15℃,10 Hz条件下动态模量提高了12.4%;在45℃,10 Hz条件下动态模量和疲劳寿命分别提高了38.1%,14.2%。因此,在沥青混合料中掺入体积占比为40%的页岩,不仅可获得优良的路用性能,节省优质的玄武岩资源,而且有利于山林资源的保护,促进道路行业“碳达峰、碳中和”目标的实现。
In order to develop the lightweight asphalt concrete,a light high-modulus asphalt mixture was prepared by using mixed macadam of light shale and basalt.By 3 h rutting test,low-temperature beam bending test,immersion Marshall and freeze-thaw splitting test,the influence law of light shale macadam on the pavement performance of asphalt mixture was studied.The dynamic modulus and fatigue property of the mixture with 40%volume substitution rate of light aggregate were experimentally studied.The results show that with the increase of the proportion of light shale macadam,the change of high temperature stability and water stability of light high-modulus asphalt mixture is not obvious,while the low temperature bending performance increases first and then decreases with the increase of light aggregate content;when the content of light shale macadam is 20%,the pavement performance of asphalt mixture is the best.The dynamic modulus of the asphalt mixture with 40%volume substitution rate of light aggregate increases by 12.4%under the condition of 15℃,10 Hz;the dynamic modulus and fatigue life increase by 38.1%and 14.2%under the condition of 45℃,10 Hz,respectively.Therefore,mixing 40%volume substitution rate of shale into the asphalt mixture not only can obtain excellent pavement performance,save high-quality basalt resources,but also is beneficial to protect mountain-forest resources,promote the aim of the road industry's"carbon peak,carbon neutralization"to realize.
作者
张辉
潘友强
张志祥
钱杰
ZHANG Hui;PAN You-qiang;ZHANG Zhi-xiang;QIAN Jie(Jiangsu Sinoroad Engineering Technology Research Institute,Nanjing 211806,China;Jiangsu Traffic Engineering Bureau,Nanjing 210004,China)
出处
《长沙理工大学学报（自然科学版）》
CAS
2021年第4期16-23,共8页
Journal of Changsha University of Science and Technology:Natural Science
基金
江苏省自然科学基金资助项目(BK20180113,BK20181112)。
关键词
轻质页岩
高模量沥青混合料
路用性能
轻质铺装结构
体积质量转换法
lightweight shale
high-modulus asphalt mixture
pavement performance
lightweight pavement structure
volume-mass conversion method
作者简介
通讯作者:张辉(1985-),男,高级工程师,主要从事路面材料及其耐久性等方面的研究。E-mail:zh@sinoroad.com。
