The Experimental Investigation Of Recycling Techniques Of Old Bituminous Mixtures Applied In Rural Highways

With the rapid development of the economy and the highway construction, the traffic and the vehicle load are steadily increasing. More and more pavements will be destroyed. Most of the highways in our country are asphalt pavements. As every year many of those are maintained and reconstructed, a lot of old bituminous mixtures will be produced. The old bituminous mixtures are one kind of the resources which can be reclaimed. If they could be reclaimed by a suitable way, we could save plenty of road materials, and this could bring a sustainable development. Thereby, it has remarkable economic and social benefits.The old bituminous mixtures being stabilized with inorganic binders is a cold recycling method. The reclaimed mixtures have been applied in base and subbase, after being detected the performance by test methods of materials stabilized with inorganic binders. But there is still much asphalt in old bituminous mixtures, if it is reasonable to reflect the comprehensive performance only by traditional test methods, and if the reclaimed mixtures are reasonable to applied just in base and subbase?Combining with the research project The Experimental Investigation of Recycling Techniques of Old Bituminous Mixtures Applied in Rural Highways, which is belonged to the transport science program in Jiangsu Province, this paper explores the parts below:(1)Study the fesibility to reclaim old bituminous mixtures from freeways and use it in rural highways.(2)Decide the inorganic binder (cement or lime-flyash), research the characteristics of the raw materials, find out the best content of the binder and the filling material.(3)Test performance of the reclaimed mixtures by test methods both of bituminous mixtures and materials stabilized with inorganic binders, explore the suitable test methods of reclaimed bituminous mixtures. (4)Research the inner structure and the mechanism of the reclaimed mixtures. Observe the interface of the inorganic binder, the asphalt, and the aggregates by crocosmic tests, thus we can study the mechanism of the reclaimed mixtures base on it.(5)According to the performance of the reclaimed old bituminous mixtures and the operational performance of rural highways, apply the reclaimed mixtures in an appropriate structure course of the rural highways. Have an optimization design of the pavement structure.(6)Design the construction scheme, decide the suitable construction technics.(7)Balance the economic and technical characteristics, the social and environmental benefits of rural highways with ordinary asphalt pavement structure and those with reclaimed old mixture courses.