| The development of The Hot In-Place Recycling technology is relatively mature,which has been popularized and applied in the whole country,and has obtained good economic and social benefits.However,compared with the new hot-mixed asphalt mixture,the recycled asphalt mixture will have a lower structural depth,which will affect the road performance.Some recycled pavement will suffer from different types of road diseases,such as peeling,network cracking,and poor oil.Traditional ultra-thin abrasion layer can improve the anti-skid performance of asphalt pavement layer and repair minor rutting and cracks and other pavement diseases,but the direct addition of ultra-thin abrasion layer on the damaged pavement can easily lead to reflection cracks,destroy the continuity of pavement,and reduce the durability of ultrathin abrasion layer.This paper explores a maintenance method which can restore the pavement performance while treating the old pavement diseases.The ultra-thin high-performance abrasion layer is applied to the treatment surface of geothermal regeneration,and the two layers are effectively bonded in the hot state,and the two layers are compacted and formed at the same time,which is equivalent to the structural layer of hot mix asphalt with sufficient thickness.It not only expands the application of treatment technology for geothermal regeneration of asphalt pavement,but also ensures the regeneration and repair of various functional diseases of old pavement,while basically not changing the elevation of the original pavement,so as to strengthen the asphalt pavement,improve the overall performance of the road,and extend the service life of the pavement.Based on the analysis of the performance characteristics of RAP asphalt and aggregate,the optimal performance was determined by the comprehensive analysis when the content of 5% regenerated agent was determined.The road performance of regenerated mixture was evaluated.The results show that with the increase of the proportion of new materials,the high temperature stability of the regenerated materials decreases,the low temperature crack resistance and the water resistance increase.Based on the shear and drawing tests of different interlayer combinations of AC-13 and SMA-10,the difference of interlayer binding between integrated surface layer and conventional overlay layer was studied.The results show that the shear and drawing strength of the interlayer thermal bonding technology is better than that of the traditional coating.With the increase of thermal bonding temperature,the integrated surface layer obtained better interlayer asphalt bonding effect and greater interlayer embedding depth,and the shear and drawing strength also increased gradually.The optimal distribution of emulsified asphalt in traditional overlay maximizes the shear and drawing strength.Based on the difference of cold and heat between the integrated surface layer and the traditional paving surface,the effective rolling time was compared and analyzed by abaqus.The results show that the effective rolling time of the ultra-thin abrasive layer is much longer than that of the traditional ultra-thin abrasive layer,and the integrated surface layer technology can effectively guarantee the compaction degree and porosity of the ultra-thin abrasive layer.On the basis of the ratio design and road performance analysis,the four point fatigue test of single material was carried out on the recycled materials with different mixing ratio of new materials.The fatigue performance of the whole structure was evaluated by using double layer trabeculae.The results show that the fatigue life of single material trabeculae and double layer monolithic trabeculae increases gradually and the stiffness modulus decreases with the increase of mixing ratio of new material.The fatigue life of the double layer trabeculae can be improved to a certain extent after improving the interlayer bonding and recycling the old materials. |
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