摘要
Abstract
The field curing conditions at low temperature,room temperature,moderate temperature and high temperature were simulated at 5,10,20,40,60 ℃,and the effects of curing temperature on the mechanical properties,low temperature crack resistance and fatigue resistance of foamed asphalt cold recycled mixture were analyzed based on indoor tests.Based on industrial CT nondestructive testing technology and SEM test,the influence of curing temperature on the micro-void structure in foamed asphalt cold recycled mixture was discussed.The result shows that the mechanical strength,low temperature crack resistance and fatigue resistance of foamed asphalt cold recycled mixture are significantly improved after increasing the curing temperature.With the increase of curing temperature,the number of micropores less than 0.10 mm3 and less than 0.05 mm3 in the micro-void gradation increased,while the number of harmful voids more than 10.00 mm3 becomes less.Increasing curing temperature can refine the microstructure of foamed asphalt cold recycled mixture.It is suggested that a control should be exercised on curing temperature during the construction of foamed asphalt cold recycled pavement,and the indoor mix design curing temperature should be adjusted in combination with the construction season temperature in cold regions.关键词
路面工程/冷再生/养生条件/配合比设计/微观结构/性能研究Key words
pavement engineering/cold regeneration/curing conditions/mix design/microstructure/performance study分类
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