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Study on Gradation Optimization Design and Technical Performance of Asphalt Mixture at High Temperature and Rainfall

Author: JiangJinYi
Tutor: HaoPeiWen
School: Chang'an University
Course: Road and Railway Engineering
Keywords: Gradation Optimization Graded uniformity Hydrodynamic erosion test Hamburg rutting test Seepage Test
CLC: U414
Type: Master's thesis
Year: 2011
Downloads: 101
Quote: 0
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Abstract


With the rapid development of China's highway, has been widely applied to the asphalt pavement. In high temperature and rainfall, more and more asphalt pavement rutting and water damage early disease, and therefore carry the high temperature stability of asphalt mixture, and resistance to water damage, the study of high temperature and rainfall and humid areas of asphalt pavement construction has a very important practical significance. The special features of the different layers of asphalt mixture requirements rainy areas suitable for high temperature asphalt mixture gradation optimization method, and for lack of asphalt mixture high temperature stability and water stability evaluation, depth asphalt The mix of high temperature performance and water stability and reasonable evaluation indicators and technical performance. This article is designed to develop a dynamic water pressure the scouring test system, and a new asphalt mixture osmometer hydrodynamic erosion test different types of asphalt mixture, penetration shear test conventional rutting test, Hamburg rutting test, conventional seepage test and new osmometer penetration test, the test results: optimized asphalt mixture has stronger anti-hydrodynamic flushing capacity, better shear resistance, better high temperature stability, and better water resistance. Effective asphalt film thickness is the important factor in resistance to dynamic water flushing capacity, and high temperature stability of asphalt mixture; maximum shear stress suspension dense structure mixes with nominal maximum particle size increases; Hamburg rutting test well distinguish the high temperature stability of the mixture of different gradation types; the AC modified asphalt mixes with the aggregate nominal maximum particle size increases, the increase in the high temperature stability of the mixture increased. The asphalt mixture Hamburg rutting test results and penetration shear test results of the regression analysis, indicating that the penetration shear test can be used to evaluate the high temperature stability of asphalt mixture; Hamburg rutting test results and hydrodynamic erosion test splitting residual The intensity ratio has a good correlation between the results and verify the design hydrodynamic scouring test its feasibility; Asphalt Mixture a high temperature and rainfall humid areas based on hydrodynamic erosion than design ideas. New penetrating instrument with traditional seepage meter measured the nonlinear correlation between the results, the new penetrating instrument to better evaluate different asphalt mixture permeability. AC Asphalt Mixes, its permeability with nominal maximum particle size of the increase. With a given level, with the increase in the aggregate ratio, reducing the permeability of the asphalt mixture. Consider gradation uniformity ATB-30 mix design method can prevent aggregate segregation phenomenon of large size asphalt mixture; volume method and the improved the SMA design method optimized asphalt paved road through trial proved The mixture has a good road performance.

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