The Matching Ratio Design And Performance Exploration Of Ultra-thin Whitetopping

With the development of reform and opening up, the nation and the local governments have stepped up its transportation infrastructure, especially in the highway construction investment, and has made Significant achievements. In the construction of highway concrete pavement, which number of bridge and road embankment fill, Because of the Subgrade Settlement result the concrete panel overall subsidence,which leading flatness of road decrease, and the pavement panel subsidence settling ranging from 0 ~ 10cm, partial sections of even more than 20cm, have severely impact on road safety. By conventional maintenance methods, it is necessary to knock down the existing concrete pavement, then pouring a new concrete, In order to resume the design elevation of the road. Traditional methods because of too long a period, will seriously affect the operation of the highway, and Cutting out the integral concrete panel is not only a waste of resources, but also increased the maintenance costs, and looking for a place to stack on the environment will have a secondary pollution.The research of this paper based on the existing cement concrete pavement panels fully utilized, and carry out the necessary treatment on the existing road surface, paved early-strength ultra-thin concrete structures, which the minimum thickness of concrete is 8cm, and the largest is the the maximum of the pavement panel subsidence settling. So that restoration of the road surface elevation and achieve the purpose of opening of the Express. At the process of repair, the design of coordinate of the ultra-thin is a focal point, and ultra-thin direct impact on the performance of concrete structure durability. The purpose of this paper is the design of coordinate of the ultra-thin ,and ultra-thin polymer and steel fiber concrete mechanical properties and pavement performance analysis and summing up, at the same time to draw ultra-thin concrete construction technology. Mainly to the following questions were studied:â—‹1 Ultra-thin concrete pavement concrete and ordinary concrete using essentially the same raw materials (such as cement, sand, stone), at the same time must use the admixtures and mineral admixture. Because of ultra-thin cement concrete has its requirements and the preparation of the characteristics of raw materials of ordinary concrete does not significantly impact factor to be considered, but it has a significant impact on ultra-thin concrete cement , so ultra-thin concrete cement concrete pavement on the more stringent technical requirements on raw materials . â—‹2 In the design of the ultra-thin concrete pavement coordinate, because of the thickness of concrete become smaller, but we require the strength of concrete has not been reduced, taking into consideration the existence of ordinary cement concrete brittle high ,disadvantage poor durability, through modification of ordinary concrete can improve its road performance is a good approach. At ultra-thin cement concrete coordinate design, in considering the traditional ordinary cement concrete coordinate design theory based on orthogonal experimental study through analysis of different outer-doped materials on the concrete nature of the impact in order to make concrete compressive strength to meet the requirements of flexural strength has increased significantly, various other mechanical properties are improved, while the durability of concrete can also have improved, reinforced concrete pavement performance, so that the structure of the repaired more lasting.â—‹3 Ultra-thin cement concrete as a road surface material, must have a high strength, ultra-thin cement concrete coordinate and mechanical properties through the experimental analysis concludes. Outer-doped material selection, we selected emulsion polymer and steel fibers to the two materials tested.â—‹4 Cement concrete pavement of long-term exposure in the natural environment, directly under the vehicle load and the role of natural factors, so the durability of cement concrete road surface are the most important indicator of pavement performance.â—‹5 The construction's success of Ultra-thin whitetopping are the key to the success of the entire patch, to be combined with physical works commenced Ultra-thin whitetopping Technology.Obtained by studying the ultra-thin design of cement concrete mix of basic theory and methods, through the incorporation of polymer and steel fiber concrete in the mechanical properties and pavement performance studies, come to guide the pilot of the road mix.