TLA改性沥青与集料界面的粘附性能研究

发布时间：2018-03-21 13:34

本文选题：TLA改性沥青　切入点：粘附性能　出处：《广西大学》2017年硕士论文　论文类型：学位论文

【摘要】：沥青路面的水损坏一直是我国道路建设的主要问题之一,沥青与集料之间的粘附性能不仅是抵抗水损坏的基础,也是直接影响沥青混合料强度、稳定性及耐久性等路用性能的主要因素。特立尼达湖沥青(TLA)作为一种性质优良的天然改性剂,将其添加到普通石油沥青中后能明显改善沥青与集料界面的粘附性能,延长沥青混凝土路面的使用寿命,提高其服务水平。为了进一步研究TLA改性沥青与集料界面相互作用机理,深入分析TLA改性沥青粘附性能的变化规律,提高TLA改性沥青路面的使用寿面,本文从试验角度,着重研究集料种类、TLA掺量、TLA改性沥青老化对粘附性能的影响以及老化TLA改性沥青混合料的抗水损坏规律。本文基于表面能理论,通过对表面能理论参数的测定,定量分析评价沥青与集料界面的粘附性能。采用挂线法测定热熔沥青表面张力,挂片法测定沥青与集料接触角,由相关公式计算得出不同集料与不同掺量TLA改性沥青之间的粘附功。试验结果表明,集料种类以及TLA掺量对粘附性能有着重要影响,同一 TLA掺量下,石灰岩与沥青的粘附性能最好,玄武岩次之,辉绿岩最差;而对于同一种集料,TLA掺量越大,粘附性能提升越明显。分别采用旋转薄膜烘箱(RTFOT)、压力老化仪(PAV)对沥青进行短期老化和长期老化,研究不同老化时间下沥青与集料粘附性能变化规律。试验结果表明,适度老化能提高沥青与集料界面的粘附性能,而过度老化则反而引起粘附性能的降低。从浸水马歇尔试验和冻融劈裂试验入手,研究短期老化、长期老化对TLA改性沥青混合料水稳定性的影响。试验结果表明,无论短期老化还是长期老化,随着老化程度的加剧,混合料水稳定性都逐渐降低,且相比长期老化,短期老化对水稳定性影响更明显。
[Abstract]:The water damage of asphalt pavement is one of the main problems in road construction in China. The adhesion between asphalt and aggregate is not only the foundation of water damage resistance, but also directly affects the strength of asphalt mixture. As a kind of natural modifier with excellent properties, TLA can obviously improve the adhesion between asphalt and aggregate when it is added to ordinary petroleum asphalt. In order to further study the interaction mechanism between TLA modified asphalt and aggregate, the change rule of adhesion property of TLA modified asphalt is analyzed deeply in order to prolong the service life of asphalt concrete pavement and improve its service level. In order to improve the use of TLA modified asphalt pavement, this paper presents an experimental study on the surface of asphalt pavement. In this paper, the influence of TLA content on adhesion property and the water damage resistance of aging TLA modified asphalt mixture are studied. Based on the surface energy theory, the theoretical parameters of surface energy are measured. The adhesion between asphalt and aggregate was evaluated quantitatively. The surface tension of hot melt asphalt was determined by the method of hanging wire, and the contact angle between asphalt and aggregate was determined by hanging sheet method. The adhesion work between different aggregates and TLA modified asphalt with different content of TLA was calculated by the relevant formula. The experimental results show that the type of aggregate and the amount of TLA have important influence on the adhesion performance, and the content of TLA is the same as the content of TLA. The adhesion of limestone to asphalt is the best, basalt is the second, diabase is the worst. The higher the adhesion property is, the shorter aging and long-term aging of asphalt are carried out by using rotary film oven RTFOT, pressure aging apparatus PAV, respectively. The change of adhesion property between asphalt and aggregate at different aging time is studied. The experimental results show that, Moderate aging can improve the adhesion between asphalt and aggregate, but excessive aging will lead to the decrease of adhesion. The short-term aging is studied through immersion Marshall test and freeze-thaw splitting test. The effect of long-term aging on the water stability of TLA modified asphalt mixture. The experimental results show that the water stability of TLA modified asphalt mixture decreases gradually with the aggravation of aging degree, and compared with that of long-term aging. The effect of short-term aging on water stability is more obvious.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

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