多元固废联合洞渣用于沥青路面水稳基层的收缩特性  

Shrinkage Characteristics of Cement Stabilized Base of Asphalt Pavement with Multi-solid Waste Combined Tunnel Slag

作　　者：王平 敬超[2] 冯文力 汤建华 史文华 WANG Ping;JING Chao;FENG Wen-li;TANG Jian-hua;SHI Wen-hua(CCCC Road and Bridge North China Engineering Co.,Ltd.,Beijing 101100,China;Hebei Provincal Engineering Research Center for Harmless Synergistic Treatment and Recycling of Municipal Solid Waste,Yanshan University,Qinhuangdao Hebei 066004,China;CCCC Investment Co.,Ltd.,Beijing 100020,China)

机构地区：[1]中交路桥华北工程有限公司,北京101100 [2]燕山大学城市固废无害化协同处置及利用河北省工程研究中心,河北秦皇岛066004 [3]中交投资有限公司,北京100020

出　　处：《公路交通科技》2023年第6期9-16,共8页Journal of Highway and Transportation Research and Development

基　　金：河北省自然科学基金项目(E2019203559);秦皇岛市科技支撑计划项目(201902A071);燕山大学博士基金项目(BL19038)。

摘　　要：为了探究多元固废联合洞渣用于沥青路面水稳基层的收缩特性,将挖掘隧道的洞渣、铁尾矿砂、磷石膏应用到路面水稳基层,开展了3种水泥剂量下的5种集料的干缩温缩测试,并对干缩温缩的综合性能进行了评价,为固废在道路半刚性基层中的综合利用提供了参考。干缩试验按照《无机结合料稳定材料干缩试验方法》(T0854—2009)要求,将梁式试件放置标准养护箱6 d泡水1 d后,在干缩室中进行了180 d的连续测试。温缩试验按照《无机结合料稳定材料温缩试验方法》(T0855—2009)要求,分别对梁式试件进行了7 d和90 d的温缩试验,温度分为5档,分别为50~30,30~15,15~5,5~-5,-5~-20℃。结果表明:每种水泥剂量下5个系列试件表现出相似的变化规律;无论干缩还是温缩,所有系列试件都是随水泥剂量的增加而增大;对于干缩,在90 d后,各类型试件干缩变形与干缩系数稳定不再发展,铁尾矿砂+3%磷石膏SW(G+I+3%P)的试件干缩应变和干缩系数最小;每种水泥剂量下含磷石膏系列试件在早期都出现膨胀,水泥剂量越高,膨胀量越大;相同水泥剂量下,SW(G+I+3%P)膨胀量最小,铁尾矿砂+6%磷石膏的试件和铁尾矿砂+9%磷石膏的试件膨胀量接近;对于温缩,所有温区都是随水泥剂量的增加而增大,各系列试件90 d龄期温缩系数要小于7 d龄期;干缩温缩综合性能的评价结果表明,3种水泥剂量下都是SW(G+I+3%P)系列试件性能最优。In order to explore the shrinkage characteristics of cement stabilized base of asphalt pavement with multi-solid waste combined tunnel slag,the tunnel slag,iron tailings sand and phosphogypsum are applied to cement stabilized base.The dry and temperature shrinkage tests on 5 kinds of aggregate with 3 cement dosages are carried out,and the comprehensive performance of dry and temperature shrinkage is evaluated to provide a reference for the comprehensive utilization of solid waste in semi-rigid base of pavement.According to the dry shrinkage test requirement of Test Method for Drying Shrinkage of Materials Stabilized with Inorganic Binders(T0854—2009),the beam specimens are placed in a standard curing box for 6 days,soaked in water for 1 day,and the test is carried out continuously for 180 days in the dry shrinkage chamber.According to the temperature shrinkage test requirement of Test Method for Temperature Shrinkage of Materials Stabilized with Inorganic Binders(T0855—2009),the temperature shrinkage test is carried out on the beam specimens for 7 days and 90 days respectively with the 5-level temperature of 50-30℃,30-15℃,15-5℃,5~-5℃and-5~-20℃.The result shows that(1)the 5 series of specimens with each cement dosage show similar changing rules;(2)no matter the dry or temperature shrinkage,all series of specimens get larger with the increase of cement dosage;(3)in the dry shrinkage test,the dry shrinkage deformations and dry shrinkage coefficients of all types of specimens remain stable and no longer develop after 90 days,of which the specimens of iron tailings sand+3%phosphogypsum,SW(G+I+3%P),has the smallest dry shrinkage deformation and dry shrinkage coefficient;(4)the series of phosphogypsum specimens with each cement dosage appear expansion in the early stage,the higher cement dosages lead to the greater expansions;(5)with the same cement dosage,SW(G+I+3%P)has the smallest expansion,while the specimens of iron tailings sand+9%phosphogypsum and the specimens of iron tailings sand+9%phosphogypsum

关 键 词：道路工程 收缩特性 干缩温缩测试 固废 沥青路面 

分 类 号：U416.2[交通运输工程—道路与铁道工程]