共查询到20条相似文献,搜索用时 203 毫秒
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为了改善高RAP掺量带来的冷再生混合料性能下降问题,研究了采用SBS改性乳化沥青作为再生沥青的冷再生混合料的设计及其性能。设计并制备了不同RAP掺量的冷再生混合料,并研究了水泥掺量、沥青用量、养护方式等因素对混合料力学强度、高温稳定性和抗水损害能力的影响规律。试验结果表明,在冷再生混合料设计中,RAP掺量越高,最佳含水量越高,最佳乳化沥青掺量越低。尽管RAP掺量的增加会导致混合料力学强度和高温性能的降低,但掺量在88%以内的冷再生混合料的各项性能均能满足再生规范要求,证明SBS改性乳化沥青有效改善了高RAP掺量下冷再生混合料性能不足的问题。水泥含量的增加会提高冷再生混合料的强度和耐久性,而沥青用量的增加使混合料的各项性能先提高后降低。 相似文献
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研究了回收沥青混合料(RAP)掺量(0%、30%、50%、70%和100%)对热拌沥青混合料最佳油石比、马氏稳定度、抗车辙性能、抗水害性能和抗裂性能的影响。结果表明,RAP降低了新沥青用量,同时RAP在一定掺量下(50%以内),显著提高沥青混合料的马氏稳定度和高温稳定性,并对抗水害和常温抗裂性能基本无负面影响,但是当RAP掺量超过50%后,沥青混合料的高温稳定性、抗水害和抗裂性能大大降低,同时值得注意的是RAP的加入在一定程度上降低了沥青混合料的低温抗裂性能,因此建议RAP的掺量不宜超过50%,并采取一定措施提升混合料的低温抗裂性能。 相似文献
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分析了石油原料与加工工艺对道路石油沥青性质的影响,并采用抗车辙剂和增延剂对其进行复合改性,制备出满足JTG F 40—2004的30~# A级道路石油沥青,考察了复合改性沥青混合料的路用性能。结果表明:通过优选合适的原料和工艺可制备出满足JTG F 40—2004的30~# B级、C级道路石油沥青,但难以制备出30~# A级道路石油沥青,主要存在高低温性能难以兼顾的技术难题;采用抗车辙母粒和增黏剂(Sasobit)复合改性可以制备出满足JTG F 40—2004的30~# A级道路石油沥青;Sasobit对沥青性能的影响程度明显大于抗车辙母粒,并且随着Sasobit用量增大,影响程度更加明显;组分差异性较小的原油比较适宜用来制备优质硬质基质沥青;复合改性30~#沥青混合料的马歇尔稳定度、车辙动稳定度、残留稳定度、冻融劈裂残留稳定度等性能明显优于茂名70~#沥青混合料,其低温性能能够达到冬冷区改性沥青的要求,同时高温性能和抗水侵害性能也大幅提升。 相似文献
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A. M. M. Abd El-Rahman M. El-Shafie S. A. El-Kholy 《Petroleum Science and Technology》2017,35(14):1473-1480
Asphalt emulsion produced from local asphalt 60/70 (Suez Co.) was modified with different types of polymers such as epoxy resin, latex styrene butadiene styrene (SBS), poly vinyl acetate (PVA), and with a mixture of two or more types of above mentioned polymers to produce a modified asphalt emulsion with high performance. This paper describes the method and technique for preparing asphalt emulsion as well as the tests, and evaluates several aspects concerning the prepared emulsion such as performance of evaporation residues, fuel and acid resistance, rheological properties, and durability. The results obtained revealed that all the modified asphalt emulsions gave better performance as compared with unmodified emulsion. Asphalt emulsion modified with a mixture of epoxy resin, latex SBR, and PVA showed the best road performance in terms of fuel and acid resistance. It was observed that the weight loss for unmodified binder, residue after evaporation of water, after immersion in kerosene for 120 min is 90% of its initial weight, while the binder improved with a mixture of SBS latex, epoxy resin, and PVA showed a weight loss of ?16% and 9% of its initial weight. Also, the admixture gives high acid resistance (weight loss ~ 9%) after immersing in 5% HCl. The dynamic viscosity test showed that asphalt emulsion modified with a mixture of SBS latex, epoxy resin, and PVA has the highest viscosity value which is a promising indication about the validity of its use for pavement in different applications. 相似文献
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针对国内高温高盐油藏,使用环氧树脂胶黏剂和酚醛树脂,选择合适的固化剂、增韧剂,制备环氧树脂/酚醛树脂复合调剖体系,确定了复合词剖剂最佳配方:100g环氧树脂和酚醛树脂混合物(环氧树脂与酚醛树脂质量比为6:4),稀释剂40mL,固化剂六次甲基四胺0.1%,中试纤维2.0%。对复合调剖体系进行了性能评价,试验结果表明,堵水调剖体系在14.5℃下养护30d,抗压强度仍达7.76MPa;在矿化度160g/t,中养护24h,7d后封堵率在96%以上;在145℃下养护时间在2.5h内,黏度均在1000mPa·s内;4000min以搅拌30min后,黏度下降8.33%,24h后抗压强度为2.36MPa;后续水驱中注水量达30PV时,堵水率基本不变。此复合调剖体系能满足高温高盐油藏堵水调剖的要求。 相似文献
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