摘要
级配碎石基层是由无粘结力的散粒体材料经碾压形成,它常存在强度较低和永久变形较大的缺点,由此导致路面易产生疲劳裂缝。本研究针对传统柔性基层的以上缺点,依托高等级公路沥青路面柔性基层的研究项目,开展了级配碎石的级配优化组合设计与施工工艺合理组合的相关研究。
本研究采用振动成型工艺,评价方法除采用古典的CBR试验方法外,本文引入了重复加载的动力CBR试验方法,研究振动成型下级配组成对混合料的力学性能的影响。根据骨架提供强度,细集料抵抗永久变形的原则,研究了振动成型下粗、细集料的最佳级配,修筑了试验路,进行了施工工艺研究及现场回弹模量的测定与分析。
研究结果表明采用适当的级配组合和施工工艺,级配碎石基层的回弹模量可提高到400~450Mpa。
Although semi-rigid base has been applied broadly, for the increasement of traffic and the development of heavy traffic, it has two disadvantages: one is the heavy crosswise shrink crack; the other is the bad structure draining condition. Many projects have proved that these two disadvantages lead to early damage of bituminous pavement. This article bring forward using graded aggregate as the middle layer of bituminous layer and semi-rigid base to solve the two disadvantages. We choose it because graded aggregate can absorb and weaken the stress and strain of crack tip of semi-rigid base to prevent the reflection cracks from occurring and it has good drain performance.
Graded aggregate soft base comes from rolling on the incompact material with low felt, so the use of graded aggregate has the disadvantages of large permanent deformation and low modulus of resilient. How to solve the disadvantages of graded aggregate through the design of grading and sound moulding technics is the stress of this article. We use vibrant moulding technics to meet the requirement that moulding reflects modern machine. Besides using classic CBR experimentation as a appraise method, we introduce repeated load MTS experimentation, it can separate elasticity and permanent deformation, it can let us analyse the deformation characteristic of graded aggregate. These two appraise methods supplement each other, analyse questions from different point of view.
Chapter five is concluding and suggestion. Not only put forward the production of this study, but also bring forward the studying content and direction which we would continue to do.
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