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级配碎石呈松散粒料结构,在外力作用下(例如压实机具)使颗粒间空隙达到最小,通过颗粒间的表面摩擦力产生固结,也称为嵌挤锁结。铺筑在半刚性基层与沥青面层之间的级配碎石过渡层,处于三向受压的状态,不传递拉应力、拉应变,使得级配碎石层能充分吸收其下层裂缝释放的应变能,从而达到抑制裂缝的效果;级配碎石的隔离作用,大大的改善了半刚性基层的湿度尤其是温度状况,极大的减少了半刚性基层遭受的温度及湿度变化,从而从根本上极大的减轻了半刚性基层自身的温缩和干缩;级配碎石层较大的空隙结构,使其成为路面结构的重要排水途径,极大的提高了路面排水效能,降低了水对路面结构的危害。因此,这种上柔下刚的结构组合既发挥了半刚性基层沥青路面高强度的优点,又在很大程度上克服了半刚性路面的缺点。可减少养护量,降低养护成本,延长道路使用寿命。本文结合试验路段,浅论一下级配碎石施工工艺及质量控制。
Graded gravel has a loose aggregate structure that minimizes interstices between particles under external forces (eg, compaction tools) and creates consolidation through surface friction between particles, also known as embossing. Paving the transition layer of graded gravel between the semi-rigid base layer and the asphalt surface layer in a three-way compression state without transferring tensile stress and pulling strain so that the graded gravel layer can fully absorb the release of the underlying cracks Strain energy, so as to achieve the effect of inhibiting cracks; grading segregation of gravel, greatly improving the semi-rigid base humidity, especially temperature conditions, greatly reducing the semi-rigid base suffered temperature and humidity changes, from the root Greatly reduce the semi-rigid grass-roots heat shrinkage and shrinkage of their own; graded macadam layer gap structure, making it an important drainage pavement structure, which greatly improved the drainage efficiency of the road, reducing the water Harm to pavement structure. Therefore, this combination of soft upper and lower structure not only exerts the advantages of high strength of semi-rigid asphalt pavement, but also largely overcomes the shortcomings of semi-rigid pavement. Reduce maintenance, reduce maintenance costs and extend road life. This article combined with the test section, talk about the graded broken stone construction technology and quality control.