Research On Lmproving The Highway Performance Of Crushed Base Layer Of Lime

In the highway development ,the lime fly-ash crushed stone is getting the extensive application ,with its high strength and the whole is good . Large quantity experience research and analysis are being done since the"seventh-five year"period pointed to the engineering characteristics , the craft of model and experimental methods.All those are the foundation of the enlarged application of the lime fly-ash crushed stone . But in recent years with its usage ,we find that there are many shortages influencing its extensive application such as the low tensile strength ,the low anti-cracking and anti- tired, the low tenacity and anti-freezed etc .The writer of this paper has done many experiences research and analyzes to find the way how to improve on its function used in the highway construction according to the actual facts in the engineering and the indoor experiments .The fine degree, the water content and the deposit time of the slaked lime influence the quality of lime fly-ash crushed stone .The fine degree of the fly ash influences the strength , the contractility and the anti-cracking of the lime fly-ash crushed stone .The strength and the soil contain of the aggregate influences its strength and contractility .This paper has given the index sign request of the raw material through the experiments.Structure composition and gradation design of crushed base layer of lime and fly ash play the most important role on the highway performance. Based on a large number of projects and indoor tests, the framework structure of base layer can provide great strength, and volumetric method can assure the design index. With the summary of test road in Jilin Province, the crushed base layer of lime and fly ash with framework structure has good performance.Frost resistance is a very difficult problem to the crushed base layer of lime and fly ash. Based on researches and indoor tests, the paper puts forward the request of least strength for frost resistance, and builds the frost resistance index and the method of frost resistance test.Construction technique is most important for crushed base layer of lime and fly ash to satisfy the design index. According to the construction of test road, the uniformity inspection, and researches of paving and rolling, the paper puts forward the problems existing in construction and improving solution methods.