The Research On The Reinforced Structure And The Drainage Measures Of G320 Old Cement Concrete Pavement

With the development of China's economic construction, road transportation industry also developed rapidly . In many national and provincial trunk roads the traffic volume is not only expected to exceed the growth rate, but also the phenomenon of overloading of vehicles and heavy-gauge widespread. So cement concrete pavement in many national, provincial highway has been unable to meet the rapid growth of the large traffic volume and heavy load, which caused variable degrees of damage and shortened the life and quality of service of the existing cement concrete pavement. Therefore, it is necessary to study the existing increased structure of cement concrete and the corresponding pavement drainage measures under the conditions of the current requirements of the heavy traffic.According to the characteristics of wet in Jiangxi Province, this paper studied on the optimizitic reinforced structure of cement concrete pavement under the heavy load and drainage design, through the investigation of traffic conditions, traffic composition of the existing cement concrete pavement and damaged state, which took the the damaged part of the road from Taiping Qiaoto Shangrao in 320 National trunk highway for example, and received the following conclusions.1. using principles of grouting technology, indoor performance test and grouting test in K531 +400～K531 +795 section, the proportion of the grouting in this section is determined, and it is identified that grouting measures used to repair the old concrete panels void board had the obvious effect, and the project entity is constructed.2. Through a large number of indoor performance test and studies on K542 +500～K543 +500 test sections, it is proved that steel fiber reinforced concrete greatly increased the panel's ultimate load and fatigue life using spreading in layers, and its gradation, water-cement ratio, the amount of cement and the construction technology are consistent with the ordinary cement concrete, the amount of steel is a quarter of ordinary steel fiber reinforced concrete , and the ordinary steel fiber cement concrete are can not be compared to it in convenience and cost savings. Under the permit of a slight increase in access we can obtain the concrete pavement with high-strength and low-amount steel fiber structure.3.By using the internal drainage layer, the edge drainage system and semi-permeable rigid concrete performance tests, we studied the scope of gradation and the composition of the design process of the semi-permeable rigid concrete. And we observed in a rain that there was outflow from the drainage pipes, so the pavement structure has good drainage performance. Also, because of Jiangxi's undeveloped economy, with the economic evaluation method this study proposed different overlay technology and construction proces according to the three different sections' damaged situation: better sections of road conditions, poor sections and the general section. In this paper, the research data has practical value to the improvement and enhancement of cement concrete pavement in the south area of China, which providing a lot of technical parameters, engineering applications. It is hoped that this data could help repairing the old road in wet and heavy traffic regions.