Design Of Cold Repair Asphalt Mixture And Research On Durability

Pothole is one of the most common disease of asphalt pavement, mainly using hot mix asphalt mixture to repair, but it is greatly affected by the construction of environmental temperature and pit slot size, and cold patch asphalt mixture is less affected by environmental temperature, the advantages of rapid repair, efficient environmental protection, gradually be applied to road maintenance work. The introduction of cold patch asphalt mixture is late in China, so the study on cold patch asphalt mixture is less, there are the spotty quality of cold patch asphalt mixture quality in the market, more emphasis on its focus on the performance of the rapid repair, to its durability and long-term performance study is less, so this paper mainly has carried on the two parts of research, the first is a complete cold patch asphalt mixture design, the second is the durable performance of cold patch asphalt mixture.The design of cold patch asphalt mixture includes two aspects, covering gradation design and binder design. In this paper, the use of vertical surface vibration compaction tester complete cold patch asphalt coarse gradation design method based on vibration, the design of fine aggregate gradation is completed by the porosity and Marshall test index as the standard, so as to complete the biggest diameter of 16 mm and 13.2 mm respectively the gradation design; Based on empirical formula, on the basis of work performance and Marshall test indicators, to complete three types of cold patch asphalt design, such as the emulsified asphalt, diluted asphalt, diluted asphalt + resin type and so onThrough a large number of laboratory test, the way of cold patch asphalt mixture with performance analysis of research, including work performance, initial strength, Medium-term strength, long-term strength, high temperature stability, etc. In the existing rules on asphalt mixture indicators and test methods on the basis of improvement, modification and summarized a set of suitable for the test method and indexes of cold patch asphalt mixture.In this paper, the durable performance of cold patch asphalt mixture for key research. The first definition for durability; Second, anti-stripping performance and water stability performance when used in determining the durability evaluation of wheel speed grinder was designed to anti-stripping performance test, mass loss rate as index, the size distribution of the fiber type, curing time, type, cold type and the influence of pit slot type against peeling performance; Finally, using adhesion test, vacuum full water Marshall test and freeze-thaw splitting test to evaluate cold patch asphalt mixture water stability performance.On the basis of indoor test pit slot repair outdoor experiment was carried out, long-term follow-up testing its road performance and durability performance, summarizes the construction technology of cold patch asphalt mixture and analyzes its economic benefit and social benefit.