Research On Prevention Measures Of EarlyDamage Of Asphalt Pavement Of Yunnan Highway

Most areas of the rainy mountainous Yunnan province, the province a number of highway asphalt pavement soon gave rise to different levels of the early damage, especially after the rainy season, the road of water damage phenomenon increases. Asphalt pavement produce different degrees of ponds, cracks, along with the penetration of moisture, asphalt pavement cracking and deformation gradually generate network and other diseases, seriously affecting the durability of asphalt pavement. Based on the asphalt road in Yunnan Water Damage conducted a survey of the various forms and designs from the asphalt, pavement drainage design and construction of the angle of the asphalt pavement causes of early water damage were analyzed on reducing water damage asphalt pavement the measures, through laboratory tests and test road paving and post-observation, to solve the asphalt pavement early damage Yunnan technical measures studied.Firstly, through the asphalt pavement on-site investigation, analysis Xiaomengyang～Jinghong two roads, Dali, Chuxiong-highway two typical asphalt pavement in the early destruction; explores the asphalt pavement early damage cause and prevention and control measures; and from design and construction of both proposed to reduce water damage to asphalt pavement technical measures.Secondly, a lot of investigation, summarized the Yunnan common type of pavement structure proposed combination of pavement structure design should follow the following principles and levels of road asphalt surface structure and thickness of the selection method.Again, according to Yunnan part two and below grade highway construction projects insufficient funds, the construction team overall low level of technology and other specific circumstances, Yunnan Province, part of the two studies is suitable and below grade asphalt pavement surface layer to use and relatively low cost SAC-type multi-gravel asphalt, asphalt mixture through an indoor water stability and high temperature stability test to verify the type of stone SAC asphalt asphalt surface layer as a surface layer can effectively improve the rutting resistance and resistance to water damage capability. By adhering properties, adhesion area ratio proposed test method, the introduction of residual adhesion stability index. By asphalt anti-stripping agent added after the short-term effects and long-term effects of the comparison test, analysis of anti-stripping agent in improving the water stability of asphalt mixture role and its limitations.Finally, to King (flood)-Meng (sea) two road K31+810～K32+910section1100m of SAC-16asphalt test section, for example, on the type of stone SAC asphalt paving process conducted a study and submit a quality paving asphalt pavement paving process and quality control methods, through the test section of the follow-up observations, analysis of multi-type asphalt gravel SAC use of effects and economic benefits.This analysis results for asphalt pavement damage water damage prevention measures like early study has some significance, but also for the Yunnan section two and below grade highway paving how to reduce the cost to provide a reference.