沥青路面温度场与格栅加筋沥青罩面现场试验

Field Trial for Temperature Field of Asphalt Pavement and for Prevention of Reflective Cracks Associated with Thermal Contraction with Geogrids

在山西省北部某二级公路埋设ZDR-11型智能温度记录仪,对路面结构温度场进行了为期1年的长期观测。现场监测结果表明:沥青面层具有较好的温度衰减作用,路面结构层中温度随时间的变化主要发生在基层或底基层中部以上;变温速率、温度梯度在路表达到最大值,随着深度的增加,其波幅越来越小;若原有路面结构强度低、裂缝不进行填塞与修补、沥青罩面过薄,则玻纤格栅加筋罩面旧沥青路面起不到防治路面温缩反射裂缝的效果。

Field observation with intelligent temperature probe （Model ZDR-11 ） embedded in different depths of asphalt pavement structure layers was conducted for one year to obtain temperature field of asphalt pavement in Shanxi Province, China. The data showed that asphalt surface layer can effectively fail temperature, the influence of air temperature change on temperature field of pavement structure was concentrated on the depth from pavement surface to base course or middle-subbase course, and the maximum values of the ratio of temperature change and temperature gradient occurred on pavement surface, but their fluctuation ranges were more and more small along with depth. Field test indicated that geogrids-reinforeed asphalt overlay may not be effective to prevent reflective cracks associated with thermal contraction, if strength of pavement is inadequate, or if the overlay thiekness is too thin, or if preeonstruetion repair of distressed old pavement isn＇ t implemented.