复合型胶粉改性沥青胶浆及混合料性能研究

发布时间：2018-01-29 21:15

  本文关键词： 橡胶沥青 流变性能 正交试验 路用性能 动态模量　出处：《武汉理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：废橡胶粉改性沥青及其混合料在减薄路面、延长路面使用寿命、延缓反射裂缝、减轻行车噪声等方面具有独特的优势。将橡胶沥青制备成固体复合型胶粉改性沥青胶浆（A），可在常温下运输、储存和使用，很好的解决了橡胶沥青储存稳定性以及能耗的问题。但是，由于国内外使用环境、路面材料及结构组成的差异，国内对复合型胶粉改性沥青胶浆及其混合料的性能缺乏认识，本文针对这一问题开展深入的研究，对于推动复合型胶粉改性沥青胶浆在我国公路工程中的应用，具有重要的意义。 本文首先对美国X公司研制的复合型胶粉改性沥青胶浆（A）的组成结构进行了测试分析。通过红外光谱及热重分析，，研究发现A的无机分占总质量的50%左右，常温储存稳定，其改性是以物理共混反应为主，并伴有化学反应发生。 然后通过Brookfield粘度试验以及动态剪切流变试验，测试分析了A的流变性能。试验结果表明，与SBS改性沥青相比，A明显改善了沥青在高温下的稳定性，并提高了低温抗裂性能，同时降低了沥青的温度敏感性。 接着通过马歇尔试验方法法，确定了A沥青混合料的油石比与级配。根据正交试验设计方法，确定最适合A沥青混合料密集配的成型工艺：将集料加热到200℃，将拌锅温度设置为195℃，加入A拌合90s，再加入矿粉拌合90s，将混合料在170℃压实成型。 最后对A沥青混合料的高温性能、低温性能、水稳定性能以及动态模量与SBS改性沥青混合料进行了对比研究。结果表明其高温稳定性弱于SBS改性沥青混合料，而低温抗裂性能与水稳定性能皆优于SBS改性沥青混合料。通过对不同级配、不同温度、不同荷载频率的沥青混合料动态模量分析发现：A沥青混合料以及SBS改性沥青混合料动态模量随着频率的增加（温度的降低）而增大。并且低中频高中温段，A沥青混合料的动态模量要大于SBS改性沥青混合料，在高频低温段，两者相近。并且CAM模型能很好的描述混合料的动态模量主曲线。
[Abstract]:The waste rubber powder modified asphalt and its mixture are thinning the pavement, prolonging the service life of the pavement and delaying the reflection crack. The rubber asphalt is prepared into solid compound rubber powder modified asphalt paste, which can be transported, stored and used at room temperature. The stability of rubber asphalt storage and energy consumption are well solved. However, due to the domestic and foreign use environment, pavement materials and structure of the difference. There is a lack of understanding on the performance of compound rubber powder modified asphalt mortar and its mixture in our country. This paper aims at this problem to carry out in-depth research, which will promote the application of compound rubber powder modified asphalt mortar in highway engineering in China. It is of great significance. In this paper, the composition and structure of compound rubber powder modified asphalt mortar (A) developed by X Company of USA were tested and analyzed by infrared spectrum and thermogravimetric analysis. It was found that the inorganic fraction of A was about 50% of the total mass, and the storage at room temperature was stable. The modification of A was mainly physical blending reaction and accompanied by chemical reaction. Then the rheological properties of A were tested and analyzed by Brookfield viscosity test and dynamic shear rheological test. The results showed that the rheological properties of A modified asphalt were compared with those of SBS modified asphalt. A obviously improves the stability of asphalt at high temperature, improves its cracking resistance at low temperature, and reduces the temperature sensitivity of asphalt. Then the asphalt mixture ratio and gradation of A asphalt mixture are determined by Marshall test method, according to the orthogonal test design method. The most suitable forming process for A asphalt mixture is to heat the aggregate to 200 鈩

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