水性环氧微表处技术研究

发布时间：2018-09-12 06:37

【摘要】：目前,我国已有大量公路进入养护维修期,若不及时采取有效的措施对裂缝、松散、磨光等早期病害进行处理,则会导致路面更严重的损坏,降低公路服务水平,甚至危及行车安全。微表处是一种可以快速解决路面早期病害,恢复表面功能的预防性养护方法,在国内外得到广泛应用,但是现有微表处材料的路用性能、耐久性及层间粘结性能都有待进一步提高。为了使微表处混合料具有更好的预防性养护效果,延长路面的使用寿命,针对上述问题,本文使用水性环氧树脂乳化沥青得到了一种路用性能、耐久性和层间抗剪强度均比普通微表处更加优越的微表处混合料。本文分析总结了乳化沥青的形成机理、破乳机理以及改性乳化沥青的制备工艺。选用阳离子乳化剂和有机稳定剂进行乳化沥青配伍设计,得到可以稳定存储的乳化沥青。对水性环氧树脂的固化机理、改性机理进行分析,通过动态剪切流变试验研究了水性环氧树脂对乳化沥青性能的影响。进行微表处混合料配合比设计,确定了乳化沥青的可选用量范围,在此范围内研究了水性环氧树脂对微表处耐磨耗性能、抗车辙性能和抗剥落性能的影响;在浸水6d湿轮磨耗试验的基础上结合冻融循环湿轮磨耗试验,分析水性环氧树脂和油石比对微表处水稳性能的影响;通过室内加速加载磨耗试验分析了水性环氧微表处抗滑性能和长期耐磨耗性能的变化规律。采用剪切试验研究了水性环氧微表处与沥青路面和水泥路面的层间抗剪性能。在进行以上试验的同时与SBR改性乳化沥青微表处混合料进行对比。最后对微表处混合料的施工性能影响因素进行研究。研究表明,随着水性环氧树脂用量的增加,乳化沥青蒸发残留物的复合剪切模量逐渐增加,相位角逐渐减小,性能得到提升;水性环氧树脂用量在8%~11%之间可以明显改善微表处的路用性能、水稳性能、抗滑性能及长期耐磨耗性能,并且较SBR微表处具有明显优势;与SBR改性乳化沥青相比,使用水性环氧乳化沥青作为粘层材料可以在较小的洒布量下使微表处具有更强的层间抗剪强度。
[Abstract]:At present, a large number of highways in our country have entered the maintenance and repair period. If effective measures are not taken in time to deal with the early diseases such as cracks, loose and polished, it will lead to more serious damage to the road surface and reduce the level of highway service. Even endangering the safety of driving. Microsurfacing is a kind of preventive maintenance method which can quickly solve the early disease of road surface and restore surface function. It is widely used at home and abroad, but the road performance of the existing micro-surfacing materials. The durability and interlaminar bond properties need to be further improved. In order to improve the preventive maintenance effect of micro-surfacing mixture and prolong the service life of pavement, the waterborne epoxy resin emulsified asphalt was used to obtain a road performance in this paper. Both durability and interlaminar shear strength are superior to ordinary microsurfacing mixtures. In this paper, the formation mechanism, demulsification mechanism and preparation process of modified emulsified asphalt are analyzed and summarized. The emulsified asphalt was designed with cationic emulsifier and organic stabilizer, and the emulsified asphalt could be stably stored. The curing mechanism and modification mechanism of waterborne epoxy resin were analyzed. The effect of waterborne epoxy resin on the properties of emulsified asphalt was studied by dynamic shear rheological test. The mixture ratio of micro-surfacing mixture was designed, and the selection range of emulsified asphalt was determined. In this range, the effects of waterborne epoxy resin on wear resistance, rutting resistance and peeling resistance of micro-surface were studied. Based on the wet wheel wear test for 6 days, the influence of water-borne epoxy resin and oil stone ratio on the water stability of microsurfacing was analyzed by combined with freeze-thaw cycle wet wheel wear test. The wear resistance and long term wear resistance of waterborne epoxy microsurfacing were analyzed by accelerated loading wear test. Shear test was used to study the interlaminar shear resistance of waterborne epoxy microsurfacing with asphalt pavement and cement pavement. At the same time, it is compared with SBR modified emulsified asphalt microsurfacing mixture. Finally, the factors affecting the construction performance of micro-surfacing mixture are studied. The results show that with the increase of the amount of waterborne epoxy resin, the composite shear modulus of the evaporative residue of emulsified asphalt increases gradually, the phase angle decreases, and the performance is improved. When the dosage of waterborne epoxy resin is between 8% and 11%, the pavement performance, water stability, skid resistance and long term wear resistance of microsurfacing can be improved obviously, and it has obvious advantages over SBR microsurfacing, compared with SBR modified emulsified asphalt. Using waterborne epoxy emulsified asphalt as the adhesive material can make the interlaminar shear strength stronger at the micro-surface with small amount of sprinkling.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U418.6

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