排水式树脂沥青混合料OGFC-13的改性试验

选择目前市场常用浅色树脂胶结料,采用苯乙烯-丁二烯-苯乙烯三嵌段共聚物(styrene butadiene styrene block polymer,SBS)改性剂提高树脂胶结料的技术性能,并在此基础上,通过专用高黏改性剂A与SBS复合改性的方法,使树脂透水沥青混合料开级配抗滑磨耗层(open graded friction course,OGFC)-13的路用性能得到明显改善。结果表明:当SBS与树脂沥青的质量比为0.13时,可满足改性树脂沥青的技术要求,但难以满足OGFC-13高温稳定性要求;高黏改性剂A与SBS树脂沥青的质量比为0.09时,复合改性SBS树脂沥青混合料OGFC-13的路用性能指标均满足要求,且抗飞散、抗车辙、抗水损害能力得到显著提高。

聚酯纤维用于环氧树脂沥青混合料增柔及增韧技术研究

为解决钢桥面铺装环氧沥青混凝土与桥面变形不一致,导致环氧沥青混凝土出现早期裂缝的问题,通过往环氧沥青混凝土中添加聚酯纤维,采用低温弯曲试验和疲劳试验方法,评价聚酯纤维对环氧沥青混凝土柔性及韧性性能的提升效果。结果表明:聚酯纤维在沥青中与沥青轻质组分吸附、三维网状内部加筋、限位等方式存在,同时与沥青产生的银纹质共同协助,锁定银纹尖端向前拓展和银纹宽度的增加,当聚酯纤维以最优掺量0.3%加入后,环氧沥青混凝土具有最优的低温变形能力和抵抗疲劳能力,此时混合料的柔性和韧性最优。

环氧树脂沥青混合料在钢箱梁悬索桥中的应用

钢桥面铺装是桥梁建设中的重难点,结合实际工程,从环氧树脂沥青混合料的发展与应用角度,分析了桥面铺装方案及材料、环氧沥青混凝土配比,并提出桥面铺装环氧树脂沥青混合料的应用要点,为桥梁的长期、安全、稳定运行提供保障。

环氧树脂改性沥青混合料性能研究

通过车辙试验和低温弯曲试验评价对比环氧树脂改性沥青混合料和基质沥青混合料高温抗流动性和低温抗裂性,由冻融劈裂试验和浸水马歇尔试验分析对比沥青混合料水稳定性,经过综合分析,得出高、低温性能和水稳定性能俱佳的环氧树脂掺量为30%。

芜湖长江公铁大桥公路桥钢桥面铺装材料抗裂性能研究

典型钢桥面热拌铺装材料在施工过程中会对环境造成严重污染,而新型冷拌铺装材料RA树脂沥青混合料不含甲苯与二甲苯,对环境污染小,符合环保理念。依托芜湖长江公铁大桥公路桥钢桥面铺装工程,对RA-10树脂沥青混合料、GA-10浇筑式沥青混合料和SMA-13改性沥青混合料的路用性能展开研究。考虑到GA-10浇筑式沥青混合料的低温性能远超其他2种沥青混合料,因此研究中设定了5种试验温度,重点分析了RA-10树脂沥青混合料与SMA-13改性沥青混合料的抗裂性能。试验结果表明,RA-10树脂沥青混合料具有良好的高、低温与抗水损害性能。结合2种沥青混合料的弯曲劲度模量差异,提出芜湖长江公铁大桥公路桥采用双层RA-10树脂沥青混合料作为钢桥面铺装材料的设计方案。

Laboratory evaluation of epoxy resin modified asphalt mixtures

The pavement performance of epoxy resin modified asphalt mixtures was investigated by the Marshall test, the indirect tensile test, the rutting test, the three-pointed bending test and the composite beam fatigue test. In comparison with the performance of epoxy resin modified asphalt mixtures, the performance of stone matrix asphalt mixtures （SMA10） was also investigated. The rutting test and composite beam fatigue test results show that the epoxy resin modified asphalt mixtures can improve permanent deformation and fatigue characteristics. They also show lower temperature susceptibility and greater resistance to moisture damage compared to the SMA10. Findings from the research indicate that the epoxy resin modified asphalt mixture provides an optional material for the pavement of long-span steel bridges in China due to profound performance and economic advantages.

Evaluation of modification effect of epoxy resin based on performance of asphalt mixtures

Based on the analysis of the main failures discovered in pavement on steel deck plate and the demanding service condition of the pavement on steel deck, high-temperature rutting test, low-temperature bending test and controlled stress flexural fatigue test are used to study the performance of asphalt mixtures modified by epoxy resin including high-temperature stability, low-temperature cracking-resistance, and fatigue cracking-resistance, which are served to evaluate the modification effect of epoxy resin of different contents. With the addition of epoxy resin, all the three performances are improved greatly. However, when the amount of epoxy resin added is over a certain value, the modification effect will be stable with no extra benefit detected. Finally, in terms of the properties of the three respects, 20%, 30%, 30% are given separately as the proposal adding contents.

一种新型的钢箱梁桥面铺装体系的应用

目前钢箱梁桥面铺筑一般由防锈层、粘结层、沥青混合铺筑层构成,在国内现在常用的方法有三大类,第一类是以德国、日本为代表的高温拌合浇筑式沥青混合料,第二类是以美国为代表的环氧树脂沥青混合料,第三类以中国为代表的剪力钉+高韧高强轻集料混凝土。以上工艺各有优缺点,本文介绍的是与上述工艺不同钢箱梁桥面铺装体系,改性环氧树脂薄层+SMA沥青混合料。该工艺施工简单,机械化投入少,施工工期短,施工成本低的特点。