Study On Mix Proportion Design Of Cold Patching Asphalt Mixture

For asphalt pavement by hot mix asphalt mixture way saw cut repair,but in the low temperature season,the temperature sensitivity of asphalt materials,a sharp decline in liquidity,difficult construction and mixture;when the pavement area is small,scattered,far away from the mixing plant,the hot mix asphalt mixture for repair inconvenience.Therefore,the development of a pre stored for a certain period of time,a small area in the pavement,disease or low temperature scattered,wet even road rain and snow weather emergency repair needs,can be directly carried out on the road repair,repair of posterior with good performance,and can be connected with the original road pavement repair material good.So it is very necessary to design the mix proportion of cold patching asphalt mixture.At present,the mature methods of Cold Patch Asphalt Mixture Design at home and abroad there is no recognized.This paper attempts to traditional Marshall mix design method based on home and abroad of Cold Patch Asphalt mixture design method,combined with the Cold Patch Asphalt Mixture characteristics and performance requirements,the traditional Marshall with appropriate the improved design method is proposed,with the Cold Patch Asphalt mixture ratio design method.And through the asphalt mixture design of high temperature performance,low temperature performance and water stability to meet the technical requirements of the fruit grading test,establish high temperature performance,low temperature performance,water stability evaluation index and fractal dimension Based on the selection of the model,the correlation model between the performance evaluation index and the fractal dimension is obtained,and then the process of optimizing the mix proportion design of cold patching asphalt mixture is optimized:(1)Fractal theory is a new research field of nonlinear theory,self acquaintance principle and iterative generation principle is an important principle of fractal theory.Establish the size distribution function by using fractal theory,deduces the formula for calculating the size distribution and the fractal dimension,the thickness distribution of material to set characterized by fractal dimension of gradation,overall the fractal dimension D,coarse aggregate fractal dimension Dc,fine aggregate fractal dimension Df.(2)The reference of orthogonal design AC-13,SMA-13 two kinds of Cold Patch Asphalt mixture,high temperature performance,low temperature performance and water stability test,the application of fractal theory,the high temperature performance(dynamic stability),low temperature performance(bending strain and strong bending strength),water stability(dynamic stability)and fractal dimension(fractal the dimension of coarse aggregate gradation fractal dimension,the fractal dimension of fine aggregate)correlation model;the model selection,recommended corresponding pavement performance prediction model;AC-13 pavement performance prediction model:High temperature stability:DS=58892.9-10435.1D-5.6DDc-11210.7Df;Low temperature stability:εB=61733.6-8761.2Dc-12982.9Df,RB=-158.1712+87.8616D-21.3569Df,Water stability:DB=-1.7154+0.5292D+0.2005Dc+0.4103Df,SMA-13 pavement performance prediction model:High temperature stability:DS=-19876.8+12213.4D-1283.0Dc-2051.6Df,Low temperature stability:εB=1084.5-773.1Df+137.9Df2;RB=-206.5243+225.6289Dc-60.9780Dc2;Water stability:DB=-186.0278+198.1204Dc-52.3464Dc2;(3)Based on the technical requirements of high temperature stability,low temperature performance and water stability,the fractal dimension of fractal dimension,coarse aggregate and fine aggregate was proposed.(4)The obtained temperature performance,the fractal dimension range evaluation technology of low temperature performance and water stability,selecting the fractal dimension of each particle size gradation launched by the rate of application,pavement performance prediction model of pavement performance test,which can satisfy the road performance requirements of excellent gradation,optimization of Cold Patch Asphalt mixture mix gradation selection and design,and the road performance of AC-13 based on SMA-13 Cold Patch Asphalt mixture design method,AC-13,design and engineering application of SMA-13 Cold Patch Asphalt Mixture for reference and practical application value of the Significance.