高旧料掺量再生沥青混凝土配合比设计研究

发布时间：2018-01-23 23:04

  本文关键词： 厂拌热再生 高RAP掺量 变异性 配合比设计 路面压实　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：沥青混凝土厂拌热再生技术是道路工程中应用最广泛的再生技术之一,但旧料掺量通常较低,影响了厂拌热再生技术的经济效益和再生效率。本文着重研究了再生混合料的高温稳定性能、低温抗裂性能和水稳定性能随旧料掺量增加体现的变化规律,在配合比设计过程中,给出了更适合级配设计的旧料掺量定义,以体积指标为控制条件的新添加的油石比预测方法。证实了高旧料掺量再生沥青混合料的技术可行性,并将旧料掺加比例提高至50%。道路地质条件、使用时长、交通量和旧料所处层位等因素的差异会导致旧料级配、含水率和油石比产生变异。本文研究了旧料含水率和旧料所处层位的关系,油石比的变异和旧料比表面积的关系。重点研究了回收沥青混合料的级配变异规律,根据旧料级配分布,将旧料按照筛孔大小分为95mm-19mm、2.36mm-4.75mm、≤2.36mm三档,通过具体实验数据得出三档旧料的级配大致变异范围,并且以40%的旧料掺量为例计算出这三档旧料引起再生沥青混合料整体的级配变异比例范围分别是：5%,6%和3%,证实变异后的再生沥青混合料的级配范围已不满足规范的规定要求。针对RAP级配变异引发的性能的变异问题,由再生沥青混合料的强度构成原理入手,采取控制4.75mm筛孔通过率趋于上限的方法保证再生沥青混合料高温性能的稳定性,并且从低温和水稳性能等方面验证了配合比设计方法的优越性。同时模拟实验研究RAP掺量对再生沥青混合料压实效果的影响规律；并针对再生沥青混合料拌和过程中的沥青膜分布特点,优化了高旧料掺量再生沥青混合料的拌和工艺。本文的研究较为全面的揭示了厂办热再生沥青混合料的性能变化以及回收旧料的变异性规律,提供了适合高旧料掺量的再生沥青混合料的配合比设计方法,探究了新旧料混合时沥青的转移规律,为厂办热再生进一步的研究提供了一定的理论基础。
[Abstract]:Asphalt concrete hot recycling technology is one of the most widely used recycling technologies in road engineering, but the amount of used materials is usually low. This paper mainly studies the high temperature stability, low temperature crack resistance and water stability of recycled mixture with the increase of the amount of used materials. In the process of proportioning design, the definition of the amount of used material which is more suitable for gradation design is given. The new prediction method of asphalt ratio with volume index as control condition proves the technical feasibility of recycled asphalt mixture with high volume of used materials, and increases the proportion of used materials to 50. Geological conditions of roads. The difference of using time, traffic volume and the layer of used material will lead to the variation of gradation, water content and oil stone ratio. This paper studies the relationship between the water cut of used material and the layer where used material is located. The relationship between the variation of oil stone ratio and the specific surface area of used materials. The rule of gradation variation of recycled asphalt mixture was studied emphatically. According to the gradation distribution of used materials, the used materials were divided into 95mm-19mm according to the size of sieve hole. 2.36mm-4.75mm, 鈮，

本文编号：1458470