The Research On Drainage Attenuation Of Anti-slip And Noise Reduction Asphalt Pavement

Anti-slip noise reduction asphalt pavement is a large void drainage asphalt pavement with a porosity of 15%-25%.Due to the large void ratio of the anti-slip noise reduction asphalt pavement,dust and impurities block the pavement voids and the permanent deformation of the pavement caused by rutting causes the drainage capacity to decrease.There are many studies on its road performance in China,but there are few studies on the attenuation law and mechanism of the drainage performance of large void asphalt pavement.In this paper,the main results obtained through indoor testing,tracking monitoring and numerical analysis of the test section are as follows:(1)The anti-skid and noise-reducing asphalt mixtures of different asphalt materials and different void ratios are made into rut boards,and the relationship between the water seepage coefficient and the attenuation coefficient of the water-seepage coefficient and the rolling time of the anti-skid and noise-reducing asphalt mixtures is obtained through rutting tests and indoor water seepage tests.,Comparative analysis of the degree of influence of asphalt material and porosity on the attenuation of water permeability coefficient.(2)Through the tracking observation of the seepage coefficient of the test section,the attenuation law of the seepage coefficient of the anti-skid and noise-reducing asphalt pavement was found.Through sampling and analy sis of pavement drill cores,the changes in the thickness of pavement structural layers are understood.(3)CT scan the core sample obtained by drilling the core and the newly-made anti-skid and noise-reducing Marshall sample,and reconstruct the scanned image to obtain a clear cross-sectional image of the sample.Use the Imhist function in Matlab to get the grayscale histogram of the image,select the threshold according to the grayscale histogram to divide the image into materials,and then binarize it to get the black and white image.Image-Pro Plus was used to measure and calculate the image,and the porosity,roundness value and fractal dimension of the void contour were selected as the void characteristics,and the distribution of the void characteristics with the height of the test piece was obtained.By comparing the changes of the void characteristics of the two test pieces,the attenuation law of the pavement structure permeability coefficient was studied.(4)Use the SEEP/W module in the finite element software Geostudio to establish a full-scale model for the pavement structure of the test section for numerical simulation analysis,select the unsaturated parameters of each structural layer on the basis of existing research,and use the pavement under moderate rainfall intensity in Hunan Province After a comparative analysis of the permeability coefficient before and after the attenuation,the change law of the volumetric water content of each structural layer with time was found.