掺沥青路面回收料再生水泥混凝土抗冻性能研究
Research on Freeze-thaw Performance of Recycled Cement Concrete with Reclaimed Asphalt Pavement
边伟 1高晋彪 2张艳聪 1贾嘉豪 2黄斐2
作者信息
- 1. 山西省交通科技研发有限公司 太原市 030032;黄土地区公路建设与养护技术交通行业重点实验室 太原市 030032
- 2. 山西大成高速公路有限公司 忻州市 034209
- 折叠
摘要
为研究掺沥青路面回收料(RAP)再生水泥混凝土的抗冻性能,采用慢冻法研究了冻融循环下RAP掺量(20％、30％、40％、50％)和水灰比(0.4、0.5、0.6、0.7)对再生水泥混凝土外观形貌和抗压强度损失率的影响.结果表明:在冻融循环下,掺沥青路面回收料再生水泥混凝土外观形貌表现出表面裂缝出现-裂缝延伸扩展-裂缝遍布表面-表面浆体胀落-试件彻底解体等发展历程.冻融早期再生水泥混凝土的抗压强度损失较为缓慢,随着冻融次数的不断增加,再生水泥混凝土的强度损失速度也随之加快.随着RAP掺量和水灰比增大,再生水泥混凝土抗压强度损失率随之增大,冻胀解体时承受的循环次数随之减小,抗冻性能随之减弱.
Abstract
In order to study the freeze-thaw performance of recycled cement concrete with reclaimed asphalt pavement(RAP-RCC),the freeze-thaw cycle test of RAP-RCC is carried out by slow freezing method.The effects of RAP content(20％,30％,40％,and 50％)and water-cement ratio(0.4,0.5,0.6,and 0.7)on the appearance and compressive strength loss rate of RAP-RCC are studied.The results show that under the condition of freeze-thaw cycle,cracks first appear on the surface of RAP-RCC,then the cracks extend and expand until they spread throughout the entire surface,and then the surface slurry begins to swell until the specimen is completely disintegrated.The strength loss of RAP-RCC is slow in the early stage of freeze-thaw,and the strength loss rate of RAP-RCC increases with the increase of freeze-thaw cycles.With the increase of RAP content and water-cement ratio,the compressive strength loss rate of RAP-RCC increases,the number of freeze-thaw cycles that RAP-RCC can withstand before disintegration decreases,and the freeze-resistance performance weakens.
关键词
道路工程/再生水泥混凝土/冻融循环/沥青路面回收料掺量/水灰比/抗压强度损失率Key words
road engineering/recycled cement concrete/freeze-thaw cycle/RAP content/water-cement ratio/compressive strength loss rate引用本文复制引用
基金项目
山西省基础研究计划项目(20210302124457)
山西省交通运输厅科技项目(2020-1-8)
山西省交通运输厅科技项目(2020-1-9)
山西交通控股集团有限公司科技项目(20-JKKJ-53)
山西交通科学研究院集团有限公司创新发展计划项目(21-JKCF-54)
出版年
2024
NETL
NSTL
万方数据