温拌胶粉改性沥青短期老化前后流变学特性研究

发布时间：2018-04-16 04:14

本文选题：温拌胶粉改性沥青 + 黏滞特性　；参考：《内蒙古工业大学》2017年硕士论文

【摘要】：胶粉改性沥青因具有良好的路用性能而被广泛应用,随着国家对绿色环保,节约能源要求的不断提高,对胶粉改性沥青施工技术也提出了更高的要求,在拌和技术的研究中多种技术手段被应用,其中温拌技术得到普遍认可,对温拌胶粉改性沥青的研究逐渐成为研究的重点。本文选取降黏剂LP和表面活性剂SDYK分别添加到60目和混合目数胶粉改性沥青中,分析不同温拌剂在短期老化前后对胶粉改性沥青高低温流变性能的影响,推荐出最适宜本地区的温拌剂和掺配量。通过三大指标试验和黏度试验分析沥青的高低温性能及感温性能,研究表明:添加LP和SDYK提高了胶粉改性沥青的高温性能,并增强了60目胶粉改性沥青的低温性能,但对混合目数胶粉改性沥青的低温性能有负面影响。由针入度指数、黏度指数和黏温指数分析沥青的感温性能可知LP和SDYK降低了胶粉改性沥青的感温性,且各沥青短期老化后感温性减小。通过黏度和黏度老化指数分析表明:LP高温降黏效果明显,随着掺量的增加降黏越明显,但对胶粉改性沥青抗老化性能有负面影响,而SDYK对胶粉改性沥青的黏度和抗老化性能改善均不明显。通过动态剪切试验对短期老化前后的各种沥青的高温流变性能进行分析,结果表明:添加LP和SDYK改善了胶粉改性沥青高温性能,其中对混合目数胶粉改性沥青高温性能的改善要优于60目胶粉改性沥青。且短期老化后,各沥青的高温性能增强。通过对车辙因子G*/(sinδ)和改进车辙因子G*/(sinδ)9的比较分析可知,G*/(sinδ)9更适合进行温拌胶粉改性沥青高温稳定性的评价,其中掺量0.6%的基于表面活性剂型的温拌混合目数胶粉改性沥青(CRBHH0.6%)的高温性能最优。同时重复蠕变试验分析结果表明:在短期老化前后,CRBHH0.6%改性沥青变形恢复能力最好,短期老化后各改性沥青变形恢复能力增强。通过弯曲流变仪试验对各种改性沥青的低温性能分析,结果表明:添加降黏剂后,胶粉改性沥青中的S值减小,m值增大,提高了胶粉改性沥青的低温性能,但随温度的降低,低温改善效果减小;而添加表面活性剂使胶粉改性沥青的低温性能变差。短期老化后,各改性沥青的低温抗裂性能降低,与添加温拌剂的60目胶粉改性沥青相比,添加温拌剂的混合目数胶粉改性沥青在短期老化后的低温性能相对更差。比较可知CRBHH0.6%改性沥青的低温性能相对较好。
[Abstract]:Rubber powder modified asphalt has been widely used because of its good road performance. With the increasing requirement of green environmental protection and energy saving, the construction technology of rubber powder modified asphalt has also put forward higher requirements.In the research of mixing technology, a variety of technical means have been applied, among which the warm mixing technology has been generally accepted, and the research on the asphalt modified by warm mixing rubber powder has gradually become the focus of research.In this paper, the viscosity reducing agent LP and surfactant SDYK were added to 60 mesh and mixed number of rubber powder modified asphalt, respectively, and the effects of different warm mix agents on the rheological properties of rubber powder modified asphalt before and after short-term aging were analyzed.It is recommended that the most suitable warm mix agent and admixture amount in this area.The high and low temperature properties and temperature sensing properties of asphalt were analyzed by three index tests and viscosity test. The results showed that the addition of LP and SDYK improved the high temperature performance of asphalt modified by rubber powder and the low temperature performance of asphalt modified by 60 mesh rubber powder.But it has a negative effect on the low temperature performance of asphalt modified by mixed rubber powder.According to the penetration index, viscosity index and viscosity temperature index, the temperature sensitivity of asphalt was decreased by LP and SDYK, and the temperature sensitivity of each asphalt decreased after short-term aging.The analysis of viscosity and viscosity aging index shows that the viscosity reduction effect is obvious at high temperature, and the viscosity reduction is more obvious with the increase of content, but it has a negative effect on the aging resistance of asphalt modified by rubber powder.However, SDYK did not improve the viscosity and aging resistance of rubber powder modified asphalt.The high temperature rheological properties of asphalts before and after short term aging were analyzed by dynamic shear test. The results showed that the addition of LP and SDYK improved the high temperature properties of asphalt modified by rubber powder.The improvement of high temperature performance of mixed rubber powder modified asphalt is better than that of 60 mesh rubber powder modified asphalt.And after short-term aging, the high-temperature performance of each asphalt is enhanced.By comparing the rutting factor (G*/(sin 未) with the improved rut factor (G*/(sin 未 9), it is concluded that the modified asphalt is more suitable for the evaluation of the high temperature stability of the modified asphalt with warm rubber powder.The high temperature performance of the modified asphalt (CRBHH 0.6) with 0.6% of the amount of surface active agent based on the surface active agent is the best.At the same time, the results of repeated creep test show that the CRBH0.6% modified asphalt has the best deformation recovery ability before and after short-term aging, and the deformation recovery ability of each modified asphalt is enhanced after short-term aging.The low temperature performance of all kinds of modified asphalt was analyzed by bending rheometer test. The results showed that the S value of modified asphalt increased with the addition of viscosity reducing agent, and the low temperature performance of modified asphalt was improved with the decrease of temperature.The effect of low temperature improvement is reduced, and the low temperature performance of asphalt modified by rubber powder is deteriorated by adding surfactant.After short term aging, the low temperature cracking resistance of the modified asphalt was decreased. Compared with the 60 mesh rubber powder modified asphalt with warm mix agent, the low temperature performance of the modified asphalt was worse than that of the 60 mesh rubber powder modified asphalt after short term aging.The comparison shows that the low temperature performance of CRBH0.6% modified asphalt is relatively good.
【学位授予单位】：内蒙古工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

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