預施微裂縫技術減少半剛性基層瀝青路面開裂的研究
[Abstract]:The semi-rigid base has the advantages of excellent plate, high strength, easy to use local materials, low price, but poor scour resistance, so it is suitable to be used as the base or base of high grade road. However, due to the addition of additives with hydraulics in the aggregate, structural cracking is easy to occur when the temperature and humidity state changes. If the surface cracks not only affect the driving comfort, but also lead to the cutting edge or dislocation of the cracks, the structure grain peeling off, under the action of dynamic water, it will also cause subgrade cutting and other diseases, thus reducing the pavement service life. In this paper, the pre-applied micro-crack technology is used to control the pavement cracking. Based on the analysis of the existing results, the indoor test method is adopted. The relationship of strength growth of specimens with pre-cracking measures and flexural fatigue characteristics of composite beam specimens are tested. It is concluded that the pre-splitting measures can not only maintain the basic strength of the original specimens, but also reduce the deformation capacity under the action of vehicle loads. The multi-crack model is discussed by the principle of fracture mechanics, and the damage degree is analyzed by using the damage mechanics. Finally, the mechanism of reducing semi-rigid base cracking by pre-applied micro-crack technology is analyzed from the point of view of meso and energy variation. Pre-application of micro-crack technology for semi-rigid base course not only does not weaken the performance of the original material structure, but also reduces the deformation ability to deal with external effects. From the view of the whole road service cycle, it not only prolongs the service life, but also saves the construction. The cost of maintenance is a new method and new technology which is worth popularizing to deal with pavement cracking.
【學位授予單位】:昆明理工大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:U416.217;U418.66
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