摘要
公路交通是促进国民经济发展的重要力量,现代化的高等级公路对沥青路面材料提出了更高的要求,因此,改性沥青的研究是当前国内外普遍关注的重大研究课题。
针对我国国产沥青绝大多数含蜡量高、温度感应性强、路用性能差的特点,本文采用特制的粉末丁苯橡胶(SBR),并复配以有机金属皂(自制)、增强剂、增塑剂、天然沥青矿、废橡胶粉等不同改性剂对我国国产沥青进行改性,现已研制成功XW型系列改性沥青。试验结果表明,XW型改性沥青的各项指标达到或超过了中华人民共和国行业标准《公路改性沥青路面施工技术规范》的技术要求,能够用于高等级公路的建设。
本文的研究工作包括以下内容:
第一部分:选题的意义及国内外研究进展。
通过对国内外沥青产品的比较,阐明了对国产沥青改性的必要性。并从沥青和改性沥青两大方面,综述了国内外在这一领域的研究进展,对改性沥青的发展历史、体系标准、分类、制备、应用等做了详细地论述。
第二部分:实验部分。
除列出本文实验所需的原料、设备以及实验方法和测试方法外,还列出了对XW型改性沥青进行测试的交通部甲级资质单位的测试设备。
第三部分:沥青改性效果及改性机理探讨。
首先对沥青中共混SBS、SBR、APP、有机金属皂、纤维等改性剂的改性效果进行了比较,在此基础上,采用在沥青中分散性好并对沥青改性效果较好的粉末SBR,复配多种改性剂对国产沥青进行综合改性,测定了软化点、针入度、延度、蜡含量、四组分、旋转薄膜烘箱老化的延度及针入度比等指标,并经交通部(北京)公路科学研究所和山东省交通科学研究所交通建设工程检测中心检验。结论:该改性沥青质量符合规范规定的技术要求。实验结果显示,软化点提高,针入度减小,沥青高温稳定性提高:低温(5℃)延度有显著改善,其低温抗裂性能尤其突出;薄膜加热试验的残留物针入度损失极小,而且残留物仍有很大的5℃延度,表明此改性沥青有良好的抗老化性能;蜡含量明显减少,对沥青性能有明显改善。同时又结合美国战略公路研究计划(SHRP)进行了测试,根据SHRP沥青规范,对沥青进行性能分级。结果表明改性沥青等级为PG64—34,较基质沥青性能提高了一个等级,应用范围明显加宽。
另外,还采用了元素分析、显微照相、扫描电镜(SEM)、热分析(TG,DTG,DSC)、红外光谱分析等分析方法对沥青进行表征,探讨了可能的改性机理。
本研究课题是甘肃省科委定向攻关项目,也是西北师范大学科技创新工程重大项目。经2002年5月查新检索,采用粉末SBR和天然沥青矿改性沥青在国内尚属首创,有机金属皂和废橡胶粉改性沥青虽有研究,但如本文之复配改性尚未见相同报道。
Asphalt is an important low-cost thermo-plastic material which is widely used for construction, in particular as road-paving. Therefore it is exposed to a wide range of load and weather conditions. Increasing traffic factors, such as heavier loads, higher traffic volume and higher tire pressure demand higher performance pavements. However, this kind of materials does not have good mechanical properties because it is hard and brittle in cold weather, and soft and fluid in a hot environment.
In order to solve these problems, We modified asphalt in this paper by powdered Styrene Butadiene Rubber(SBR) blend with organic acids soaps, asphltite, reinfocer, plasticizer and waste automobile tyres powder. The best ratio was obtained through orthogonal design. Softening point, ductility, penetration degree and these properties after Rotary Thin Film Oven Test(RTFOT) aging of modified asphalt have been determined. The qualification test also did by Transportation Department of China and Institute of Highway of Shandong Province. The results show that the polymer blends less susceptible to temperature and increasing substantially its all-round performance. The properties of modified asphalt are higher than original asphalt and meet the Specification for Construction of Highway Modified Asphalt Pavement(JTJ 036-98) of China, so that it can be used as highway pavements.
The sample also measured according to Strategic Highway Research Program (SHRP) of USA such as PAY, DSR and BBR. The performance grade of modified asphalt was increased.
The microstrcture of the modified asphalt was characterized by SEM, FT-IR, TG-DTG, DSC and microscopy, and then, we discussed the possible mechanism of the modification.
Three parts are included in this paper:
Part one: The review of asphalt and modified asphalt of highway asphalt binders.
Part two: The material and instrument employed in this paper.
Part three: The results of our research and the mechanism discussion.
In this paper, powdered SBR and asphltite were firstly used to modify asphalt for highway pavements in China. We got satisfied results.
This work was supported by the Science and Technology Commission of Gansu Province and the NWNU-KJCXGC-03 of Northwest Normal University.
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