Research On Construction Quality Control Of Asphalt Pavement Smoothness

With the continuous development of the national economy,China's traffic construction has been rapidly developed,while the rapid growth of road traffic,driving speed and vehicle load gradually increased,put forward higher requirements for the pavement performance.Among them,smoothness,as one of the important indexes of pavement performance,has a direct impact on driving stability and comfort,so it is very important to control smoothness in the construction process,and has an important significance to ensure social benefits.In order to ensure the smoothness of asphalt pavement,construction quality control is the most important link.First of all,this paper combs the research status of asphalt pavement smoothness at home and abroad,puts forward the value of smoothness research,and expounds the research ideas of this subject.Secondly,from the construction point of view,this paper analyzes the reasons that affect the smoothness of asphalt pavement,including subgrade settlement,base unevenness,mixture quality,mixing technology,paving technology,paving machinery,rolling technology,rolling machinery,pavement joints and environmental changes,and systematically discusses the impact mechanism of different factors in the whole construction process.Thirdly,based on the data of an engineering example,this paper makes a probability statistical analysis of the factors affecting the smoothness of asphalt pavement,and summarizes the statistical law of smoothness transfer.Then,the transfer law of pavement evenness between different structural layers is analyzed,and the transfer formula of pavement evenness is summarized.Finally,according to different factors of smoothness,the corresponding smoothness control strategy is put forward according to the main construction links,mainly including subgrade and base construction,asphalt mixture mixing,transportation,paving and rolling in the process of construction conditions and construction process improvement.The results show that the factors affecting the pavement smoothness include not only the smoothness of the lower formed pavement,but also the smoothness of the upper loose paved pavement,as well as many additional effects from the outside.The eventual smoothness of the formed pavement is the result of all the factors.Among them,the four important factors are the concave-convex deviation value of the lower molding pavement,the concave-convex deviation value of the upper loose pavement,the compression ratio of asphalt mixture and the additional irregularity.The influence factors of other evenness are transferred to asphalt pavement through these four random variables.Therefore,as long as the above four main factors are effectively measured and construction control,the measures to ensure the pavement smoothness throughout the construction of each link,so as to effectively control the smoothness of asphalt pavement.