SBS改性沥青和橡胶粉改性沥青机理及路用性能研究
发布时间：2019-03-02 16:09
【摘要】：SBS改性沥青同时具有较好的高低温性能,是目前使用量最大、最广泛的改性沥青。橡胶粉改性沥青是一种新型的优质复合材料,具有环保、经济、节能和降噪等特点。但是,目前国内外对两种改性沥青的性能优劣没有统一的认识,仍然存在争议。本文出发点是系统的对比研究SBS改性沥青和橡胶粉改性沥青。从原材料的选择出发,通过改变改性沥青制备过程中剪切时间、剪切温度、剪切速率,对比研究SBS改性沥青和橡胶粉改性沥青制备工艺,根据改性沥青性能,分别确定合理的改性沥青制备工艺。通过环球软化点试验、低温延度试验、弯曲蠕变试验(BBR)、针入度试验、旋转薄膜烘箱试验(RTFOT)、压力老化试验(PAV)等试验,对比研究了不同改性剂掺量下的SBS改性沥青和橡胶粉改性沥青的高温性能,低温性能,感温性能和抗老化性能,综合考虑改性沥青的性能指标,分别提出合理的改性剂掺量。选取AC-13和SMA-13型级配进行混合料配合比设计,并分别确定最佳沥青用量,通过室内高温车辙试验、浸水汉堡车辙试验,马歇尔稳定度试验、冻融劈裂试验以及低温弯曲试验等对比分析了SBS改性沥青和橡胶粉改性沥青混合料的高低温性能以及水稳定性。借助荧光显微镜和傅立叶红外光谱分析技术对比研究了SBS和橡胶粉与沥青的共混状态以及沥青分子结构的变化情况,以此来探究两种改性沥青的机理。根据试验结果可知,随着SBS和橡胶粉掺量的增多,两种改性沥青的高低温性能、温度敏感性以及耐老化性能均有明显改善,SBS改性沥青比橡胶粉改性沥青具有更好的高温性能,橡胶粉改性沥青比SBS改性沥青具有更好的低温性能和温度敏感性;同一种级配类型,SBS改性沥青的高温和水稳定性均高于橡胶粉改性沥青,而橡胶粉改性沥青的低温抗裂性最好;机理试验结果发现,两种改性剂只是与沥青共混,并没发生明显的化学反应,改性剂在沥青中分散均匀。论文最后提出了试验路路面病害调查方案,并分析了两种改性沥青的社会经济效益、适用范围和目前存在的问题。研究成果对以后两种改性沥青的工程实践具有一定的指导和参考价值。
[Abstract]:SBS modified asphalt has good high and low temperature performance at the same time, it is the most widely used modified asphalt at present. Rubber powder modified asphalt is a new type of high quality composite material, which has the characteristics of environmental protection, economy, energy saving and noise reduction. However, there is no unified understanding of the performance of the two kinds of modified asphalt at home and abroad, and there is still controversy. The starting point of this paper is a systematic comparative study of SBS modified asphalt and rubber powder modified asphalt. Starting from the selection of raw materials, by changing the shear time, shear temperature and shear rate during the preparation of modified asphalt, the preparation technology of SBS modified asphalt and rubber powder modified asphalt was compared and studied, according to the properties of modified asphalt. The reasonable preparation process of modified asphalt was determined respectively. Through the global softening point test, low temperature ductility test, bending creep test (BBR), penetration test, rotating film oven test (RTFOT), pressure aging test (PAV), etc. The high-temperature, low-temperature, temperature-sensitive and anti-aging properties of SBS modified asphalt and rubber powder modified asphalt with different content of modifiers were compared. Considering the performance index of modified asphalt, the reasonable content of modifier was put forward respectively. AC-13 and SMA- 13 gradation are selected to design the mixture mix ratio, and the best asphalt dosage is determined respectively. Through indoor high temperature rut test, immersion Hamburg rut test, Marshall stability test, The high and low temperature performance and water stability of SBS modified asphalt and rubber powder modified asphalt mixture were compared and analyzed by freeze thaw splitting test and low temperature bending test. By means of fluorescence microscope and Fourier transform infrared spectroscopy (FTIR), the blending state of SBS and rubber powder with asphalt and the change of asphalt molecular structure were studied in order to explore the mechanism of the two kinds of modified asphalt. According to the test results, with the increase of the content of SBS and rubber powder, the high and low temperature performance, temperature sensitivity and aging resistance of the two kinds of modified asphalt are obviously improved, and the SBS modified asphalt has better high temperature performance than the rubber powder modified asphalt, and the high temperature performance of the modified asphalt is better than that of the rubber powder modified asphalt. Compared with SBS modified asphalt, rubber powder modified asphalt has better low temperature performance and temperature sensitivity. In the same gradation type, the high temperature and water stability of SBS modified asphalt is higher than that of rubber powder modified asphalt, and the low temperature cracking resistance of rubber powder modified asphalt is the best. The results of mechanism test show that the two modifiers are only mixed with asphalt, and there is no obvious chemical reaction, and the modifiers are dispersed uniformly in asphalt. At the end of the paper, the investigation scheme of road surface disease is put forward, and the socio-economic benefits, application scope and existing problems of two kinds of modified asphalt are analyzed. The research results have certain guidance and reference value to the engineering practice of the later two kinds of modified bitumen.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414
[Abstract]:SBS modified asphalt has good high and low temperature performance at the same time, it is the most widely used modified asphalt at present. Rubber powder modified asphalt is a new type of high quality composite material, which has the characteristics of environmental protection, economy, energy saving and noise reduction. However, there is no unified understanding of the performance of the two kinds of modified asphalt at home and abroad, and there is still controversy. The starting point of this paper is a systematic comparative study of SBS modified asphalt and rubber powder modified asphalt. Starting from the selection of raw materials, by changing the shear time, shear temperature and shear rate during the preparation of modified asphalt, the preparation technology of SBS modified asphalt and rubber powder modified asphalt was compared and studied, according to the properties of modified asphalt. The reasonable preparation process of modified asphalt was determined respectively. Through the global softening point test, low temperature ductility test, bending creep test (BBR), penetration test, rotating film oven test (RTFOT), pressure aging test (PAV), etc. The high-temperature, low-temperature, temperature-sensitive and anti-aging properties of SBS modified asphalt and rubber powder modified asphalt with different content of modifiers were compared. Considering the performance index of modified asphalt, the reasonable content of modifier was put forward respectively. AC-13 and SMA- 13 gradation are selected to design the mixture mix ratio, and the best asphalt dosage is determined respectively. Through indoor high temperature rut test, immersion Hamburg rut test, Marshall stability test, The high and low temperature performance and water stability of SBS modified asphalt and rubber powder modified asphalt mixture were compared and analyzed by freeze thaw splitting test and low temperature bending test. By means of fluorescence microscope and Fourier transform infrared spectroscopy (FTIR), the blending state of SBS and rubber powder with asphalt and the change of asphalt molecular structure were studied in order to explore the mechanism of the two kinds of modified asphalt. According to the test results, with the increase of the content of SBS and rubber powder, the high and low temperature performance, temperature sensitivity and aging resistance of the two kinds of modified asphalt are obviously improved, and the SBS modified asphalt has better high temperature performance than the rubber powder modified asphalt, and the high temperature performance of the modified asphalt is better than that of the rubber powder modified asphalt. Compared with SBS modified asphalt, rubber powder modified asphalt has better low temperature performance and temperature sensitivity. In the same gradation type, the high temperature and water stability of SBS modified asphalt is higher than that of rubber powder modified asphalt, and the low temperature cracking resistance of rubber powder modified asphalt is the best. The results of mechanism test show that the two modifiers are only mixed with asphalt, and there is no obvious chemical reaction, and the modifiers are dispersed uniformly in asphalt. At the end of the paper, the investigation scheme of road surface disease is put forward, and the socio-economic benefits, application scope and existing problems of two kinds of modified asphalt are analyzed. The research results have certain guidance and reference value to the engineering practice of the later two kinds of modified bitumen.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414
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