Investigation of Application Effect of Hot In-place Recycling Equipment for Asphalt Pavement

To reduce the limitation of equipment on hot in-place recycling technology application and improve the application effect of hot in-place recycling technology in asphalt pavement maintenance,the application effect of two key equipments of hot in-place recycling train,the Intermittent Heating Wall (IHW) and the Hydropneumatic Scarifying Device (HSD),are investigated based on theoretical analysis,laboratory tests and field tests.And the construction effect and quality of the hot in-place recycling train are evaluated based on laboratory performance tests of recycling asphalt mixture and field performance tests of testing roads.The results indicate that compared with the traditional heating device,the IHW can heat the asphalt pavement faster and more uniformly without further aging the asphalt binder of pavement;compared with the traditional milling device,the HSD can scarify the heated pavement faster and more uniformly without changing the original aggregate gradation of pavement;and finally,the recycling asphalt mixture and pavement produced by the hot in-place recycling train have good road performance and interlaminar bonding.Therefore,the improved hot in-place recycling train is proved to be promising in hot in-place recycling pavement with good construction quality and service life.