耐久性微表处混合料室内试验及工程应用研究

发布时间：2018-10-26 18:14

【摘要】：微表处是一种路面罩面技术,具有高抗滑磨耗、抗滑性能的特点,适用于交通量大、重载车辆多、车速快、刹车性能要求高的高等级公路,具有开放交通快,施工周期短的优点。由于气候与交通组成的特殊性,广东省自2005年才在高速公路路面预防性养护中开始引入微表处技术,并在多条高速公路进行了微表处施工。这些高速公路微表处的铺筑为推广微表处技术在我省路面预防性中应用起到了积极的作用。然而,微表处技术的设计方法和施工工艺还很不成熟,最突出的问题是缺乏适宜而有效的微表处路用性能评价方法,室内试验一些评价指标缺乏科学性和合理性,不能适应我省微表处路面工程实际需要,导致部分微表处路面的使用寿命较短,极大地限制了该技术在我省预防性养护的推广和应用。为了推进微表处技术在我省的应用,本研究对微表处技术的设计方法、工艺条件、使用环境以及使用效果进行系统的评价和总结,基于“路面表面功能加速加载设备”开展优化研究,提出功能型微表处混合料的设计方法。研究得出以下主要结论：一、微表处的级配以及改性乳化沥青的性能对其路用性能有显著影响,级配越粗糙、沥青针入度越小的微表处混合料具有更好的抗滑性能与耐磨耗性能。当微表处用于高速公路路面养护时,推荐采用MS-3型下限作为设计级配,采用针入度较小、延度较小质量较稳定的改性乳化沥青作为微表处混合料的结合料。二、合理用量的纤维能够显著提升微表处混合料的抗滑性能、抗剥落性能和耐磨耗性能。采用MS-3型级配时,推荐最佳纤维用量宜为0.2%。添加环氧树脂有利于增加微表处混合料的抗剥落性能,随着环氧树脂用量的增加,其抗剥落性能不断增强,从适用性以及经济性方面考虑,建议环氧树脂的用量宜控制在2%以内。
[Abstract]:Microsurfacing is a kind of pavement covering technology, which has the characteristics of high skid resistance and skid resistance. It is suitable for high grade highways with large traffic volume, heavy vehicles, fast speed and high braking performance. The advantage of short construction period. Due to the particularity of climate and traffic composition, the microsurfacing technology has been introduced into the preventive maintenance of expressway pavement in Guangdong Province since 2005, and the micro-surfacing construction has been carried out on several expressways. The paving of these micro-surfacing places plays an active role in popularizing the application of micro-surfacing technology in pavement prevention in our province. However, the design method and construction technology of micro-surfacing technology are still immature, the most prominent problem is the lack of appropriate and effective evaluation method for the performance of micro-surfacing, and the lack of scientific and reasonable evaluation indexes in laboratory tests. It can not meet the actual needs of the pavement engineering in our province, which leads to the short service life of some micro-surfacing pavement, which greatly limits the popularization and application of the technology in preventive maintenance in our province. In order to promote the application of microsurfacing technology in our province, this study systematically evaluates and summarizes the design method, process conditions, environment and effect of microsurfacing technology. Based on the optimization research of pavement surface function accelerating loading equipment, the design method of functional micro-surfacing mixture is put forward. The main conclusions are as follows: firstly, the gradation of microsurfacing and the performance of modified emulsified asphalt have a significant effect on the road performance, and the gradation is rougher. The smaller the pitch penetration, the better the skid resistance and wear resistance of the mixture. When the micro-surfacing is used for highway pavement maintenance, the MS-3 lower limit is recommended as the design grade, and the modified emulsified asphalt with small penetration and low ductility is recommended as the binder of the micro-surfacing mixture. Second, the reasonable amount of fiber can significantly improve the skid resistance, peeling resistance and wear resistance of the micro-surfacing mixture. When MS-3 grading is adopted, the best fiber dosage is recommended as 0.2. The addition of epoxy resin can increase the peeling resistance of the mixture. With the increase of the amount of epoxy resin, the anti-spalling performance of the mixture increases continuously, which is considered from the aspects of applicability and economy. It is suggested that the amount of epoxy resin should be controlled within 2%.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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