| Hot Plant mix recycling technology has been widely used in the highway maintenance engineering and achieved a lot of successful experience.The economy of the southwest mountainous area is relatively backward,lack of highway coverage and has assumed the big transport capacity.The alignment of mountainous highway is more complex,more sections of large longitudinal slope,turning for a curve radius and the larger traffic loads.The climate of Southwest mountain is humid,rainy season lasted longer,more rainfall,high temperature in summer while low in winter.The milling of RAP from the southwest mountainous highway is taken from the road sections under different climatic conditions and traffic loads.Old asphalt aging serious,serious damage to the old gradation,asphalt content of the old material,old material aging degree and aggregate dispersion are larger.RAP performance fluctuations,recovery is difficult,it is difficult to ensure the recovery of old material properties of stability,uniformity.It is worthwhile to study whether the hot mix plant regeneration technology is applicable to the southwest mountain highway and determine its best mixing ratio.In this paper we analyze the aging degree of asphalt,aggregate gradation and asphalt content of RAP in Southwest Mountainous Highway.Then we propose the necessity of RAP pretreatment,determine the optimal dosage of recycling agent and analyze old asphalt aging and regeneration mechanism in Southwest Mountainous area.Based on the grey relational grade analysis method,the reference material was used to determine the addition ratio of each file from the RAP.We determine the regeneration mixture gradation and the optimum asphalt aggregate ratio by programming method and the Marshall test method when designing the regeneration mixture with proportion.On the basis of this study,the effects of mixing ratio of old materials on the high temperature stability,water stability and low temperature crack resistance of recycled mixture were studied.By paving test road,the test section of the flatness,degree of compaction,friction coefficient and water permeability coefficient were detected.Combined with test road,we analyze and summarize the construction technology of mixing,paving and rolling of reclaimed asphalt mixture in southwest mountain area.In this paper,based on the project of hot mix plant regeneration technology applied on hot,humid and mountainous ordinary highway asphalt pavement from the transportation department of Guizhou Province in 2013.In view of the question of whether the heat regeneration technology in the plant is suitable for the ordinary highway in the southwest mountainous area.The high temperature stability,water stability and low temperature crack resistance of recycled asphalt mixture in southwest mountainous area are studied by the method of combining theoretical analysis and experimental study with the milling RAP of the mountain highway.The reasons for the performance degradation of the old materials in the southwest area is analyzed.The optimum mixing ratio of recycled asphalt mixture in southwest mountainous area is30%.The effect of RAP content on the road performance of recycled asphalt mixture is expected to be revealed.It makes possible for the sustainable utilization of the old material with poor performance and high fluctuation in the southwest mountainous area.In this paper,the results of the study on the old asphalt aging and recycling mechanism in the southwest mountainous area,it is revealed that the performance of recycled asphalt mixture has significance in the change of the mixing ratio of the RAP.It makes possible to provide technical basis for the application of heat regeneration technology in the southwest mountainous area. |
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