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Enter the maintenance, conservation stage in China 's road construction , road reconstruction abandoned the original pavement materials directly , using new materials , will not only cause environmental pollution , and waste of resources , therefore, for the international scarcity of resources in the form of used asphalt mixed material recycling study is necessary. In this paper, information research, laboratory experiments , theoretical analysis and engineering lessons learned , summed up the previous scene cold recycling technology experience , in-depth study of the cold recycling , focusing on the evaluation of the old material , the asphalt foaming test research , at room temperature regenerant research idea , medium-grained renewable mix target level with design , foamed bitumen ( emulsified asphalt ) mix design method to standardized , strictly based on the scene cold renewable technology . First, the old asphalt pavement material to be analyzed by laboratory experiments to evaluate the material properties of the binder , evaluation and analysis of the aging asphalt penetration grading system introduced by the existing norms and SHRP performance grading system test . Second significance analysis of cold recycling the regenerant ( asphalt, emulsified asphalt ) , research and analysis , including the development of foamed bitumen using orthogonal test of foamed bitumen foaming characteristics influencing factors exist for cold recycling regenerant problems of room temperature cold renewable regenerant developed ; tends to medium-grained mix of characteristics in conjunction with the majority of the surface layer and the grass-roots mix again , mix one of the key factors - level with regeneration from the impact of cold start , based on the design skeleton mix thinking dense structure , design gradation by N method, K law and I and other methods , with test level and after Bailey method to get the cold recycling tablets skeleton dense mix target range of gradation , avoid gradation too wide cause uneven pavement material properties , thus affecting the cold recycling mix road performance . Finally regeneration of foam (emulsion ) asphalt cold mix design study , Recycled Asphalt Mixture as the research object , by laboratory experiments , evaluation and analysis of the mechanical properties of the recycled mix , to determine the best dosage of regenerant and renewable mixes high temperature stability , water stability , fatigue characteristics were studied , with a view to promoting the development of the on-site cold recycling technology widely used in our .
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