外掺剂改良再生水泥稳定碎石基层材料试验研究  

Research on Recycled Cement Stabilized Crushed Stone Base Material Improved with Admixtures

作　　者：雷蕾[1] 姜慧[1] 顾万 康爱红[2] 沈楸 LEI Lei;JIANG Hui;GU Wan;KANG Ai-hong;SHEN Qiu(Xuzhou University of Technology,Xuzhou 222100,China;College of Architectural Science and Engineering,Yangzhou University,Yangzhou 225127,China;Jiangsu Yangtze River Expressway Management Co.Ltd.,Wuxi 214000,China)

机构地区：[1]徐州工程学院,徐州市222100 [2]扬州大学建筑科学与工程学院,扬州市225127 [3]江苏扬子江高速通道管理有限公司,无锡市214000

出　　处：《公路》2022年第2期31-37,共7页Highway

基　　金：国家自然科学基金资助项目,项目编号51578480;江苏省高等学校自然科学研究重大项目,项目编号19KJA570001;江苏省研究生科研与实践创新计划项目,项目编号SJCX18_0799。

摘　　要：将再生骨料应用于水泥稳定碎石基层材料是实现矿料资源再生利用的关键举措。分别采用粉煤灰和聚丙烯纤维两种外掺材料,对单掺和复掺制备的再生水泥稳定碎石进行了研究。重点以无侧限抗压强度、劈裂强度、干燥收缩及疲劳寿命为指标,对改良前后水泥稳定碎石材料的性能进行了探索,进而分析不同改良剂材料对水泥稳定碎石材料性能的影响规律。研究结果表明:粉煤灰和聚丙烯纤维对再生水泥稳定碎石材料性能的提升均具有一定积极作用。其中,粉煤灰有利于改善碎石材料的抗压强度和疲劳寿命,而聚丙烯纤维更适用于提升碎石材料劈裂强度和干燥收缩性能。在相应指标控制范围内,将粉煤灰和聚丙烯纤维进行复掺后,改良再生水泥稳定碎石的再生骨料的使用掺量可由原来的的40%提升至60%左右。Applying recycled aggregates to cement-stabilized crushed stone base materials is a key measure to realize the recycling of mineral resources. In this paper, fly ash and polypropylene fiber are used as two external admixtures to study the recycled cement stabilized gravel with single admixture and compound admixture. The unconfined compressive strength, splitting strength, drying shrinkage and fatigue life as indicators, the performance of cement stabilized macadam materials before and after the improvement is explored, and the influence rules of different modifier materials on the performance of cement stabilized macadam materials is analyzed. The research results show that: fly ash and polypropylene fiber have a certain positive impact on the improvement of the performance of recycled cement stabilized crushed stone materials. Among them, fly ash is beneficial to improve the compressive strength and fatigue life of crushed stone materials, while polypropylene fiber is more suitable for improving the splitting strength and drying shrinkage performance of crushed stone materials. Within the control range of the corresponding indicators, after compounding fly ash and polypropylene fiber, the amount of recycled aggregate used for the improved recycled cement stabilized gravel can be increased from the original 40% to about 60%.

关 键 词：半刚性基层 粉煤灰 聚丙烯纤维 再生骨料 水泥稳定碎石 力学性能 

分 类 号：U416.26[交通运输工程—道路与铁道工程]