共查询到20条相似文献,搜索用时 140 毫秒
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以提高沥青路面中面层高温动态模量为研究目标,以SK-90号沥青为基质沥青,通过对高模量低标号沥青、SBS改性沥青、青川岩沥青改性沥青及DUROFLEX高模量剂沥青混合料的高温性能试验,对比研究了高模量低标号沥青对高温性能的影响;采用SUP-19级配,以动稳定度和动态模量为指标评价了不同沥青混合料的高温性能。通过车辙试验、动态模量试验验证了高模量低标号沥青混合料的高温抗变形能力,即其抗车辙能力和动态模量较普通沥青混合料及与其他改性沥青混合料比较有显著提高。 相似文献
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为了了解新疆岩沥青的路用性能,在沥青胶结料中掺入不同量的岩沥青,进行针入度、延度扣软化点试验,对加入岩沥青后的沥青混合料进行了车辙试验、低温弯曲试验、浸水马歇尔试验、冻融劈裂试验、疲劳试验,并与SBS改性沥青及沥青混合料的试验结果进行了比较。结果发现掺入岩沥青后,沥青胶结料的的高温稳定性和抗老化性得到了较大程度的提高,掺入量为15%的岩沥青改性沥青混合料动稳定度、冻融劈裂强度比、劲度模量较基质沥青分别提高了3.5倍、0.34倍、2.89倍,说明其高温稳定性、水稳定性、抗疲劳性有了较大的提高,而低温弯曲破坏强度提高了0.18倍,反映出其低温抗裂性也得到了一定程度的改善,表明掺入岩沥青的沥青混凝土具有良好的路用性能。 相似文献
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依托徐州市三环南路水泥路面改造工程为载体,进行AC-20与SUP20型沥青混合料在抗车辙性能方面的对比,因此该研究项目采用相同的上面层结构,下面层则分别采用AC-20改性沥青混凝土和SUP-20改性沥青混凝土,从两类沥青混合料级配设计、室内车辙试验、施工工艺、通车后效果等方面进行抗车辙性能的分析比较,以求对徐州地区沥青路面的结构设计和施工提供些许参考。 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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掺加岩沥青的沥青混合料性能评价 总被引:1,自引:0,他引:1
岩沥青的掺量直接影响了混合料的路用性能,也对工程的经济性产生巨大影响。通过车辙试验、浸水马歇尔试验、冻融劈裂试验和低温小梁弯曲试验,分别评价了不同岩沥青掺量的混合料的高温性能、水稳定性和低温性能。研究认为,随着岩沥青掺量的增加,其对混合料路用性能的影响逐渐减弱,当掺量由20%增加到25%时,性能变化很小。因此,在工程应用中,建议岩沥青的掺量宜小于20%。 相似文献
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《Egyptian Journal of Petroleum》2015,24(4):483-491
The use of sulfur in pavement laying was developed in 1980 but it was restricted in the late 19th century due to its environmental problems and its high reactivity toward oxidation processes which give sulfuric acid products that are capable of destroying the asphalt mixture. The study involved the conversion of elemental sulfur to a more stable modified one using a combination of byproducts of olefin hydrocarbons that were obtained from petroleum fractional distillates and cyclic hydrocarbon bituminous residue at 145 °C. The changes in the structural characteristics and morphology of prepared modified sulfur were studied using XRD and SEM respectively. Also DSC curves help us to elucidate the changes in sulfur phases from α-orthorhombic to β-mono clinic structure. The technique of nanoindentation helps us to compare the mechanical properties of modified and pure sulfur including modulus of elasticity and hardness. The hot mixture asphalt designs were prepared according to the Marshall Method in which the asphalt binder content was partially substituted with 20%, 30%, 40%, and 50% modified sulfur. The mechanical properties were measured including Marshall Stability, flow, air voids, and Marshall Stiffness. From the overall study, the results indicated that asphalt could partially be substituted with modified sulfur with no significant deleterious effect on performance and durability of hot mixed asphalt. 相似文献
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纳米ZnO/SBS改性沥青的研究 总被引:1,自引:0,他引:1
纳米粒子作为一类用于对沥青进行改性的新型材料,已成为改性沥青研究新的方向。采用溶剂法将纳米ZnO粒子和SBS制备成胶体,并通过合适的改性工艺,将其加入基质沥青中,制得纳米ZnO/SBS改性沥青。基质沥青为日本加德士70号和中海70号重交通道路沥青,SBS为韩国LG501P线型结构。对纳米ZnO/SBS改性沥青的技术性能进行了对比与评价,同时通过电镜、荧光显微镜对纳米ZnO/SBS改性沥青的微观结构与共混机理进行了一些研究与探讨。结果表明:采用溶剂法制得的纳米ZnO/SBS改性沥青可以很好发挥纳米ZnO的特点,改善SBS在沥青中的分散效果,从而使改性沥青的各项性能(特别是其低温延度)以及混合料的路用性能等都有明显的改善与提高。 相似文献
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AbstractIn order to investigate the enhancing effect of basalt fiber (BF) on toughness of asphalt, BF modified asphalt and mixture were prepared. Strip tensile test was performed to study the anti-cracking ability of BF modified asphalt. The effect of BF on toughness of asphalt mixture was investigated using MTS system. SEM was conducted to explore the enhancing mechanism of BF. The results showed that the ultimate tensile stress of BF modified asphalt peaked when fiber content reached 0.4% by weight of asphalt mixture. Composite materialization and self-healing force of BF led to the enhancing effect on toughness capacity of asphalt. 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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废胶粉改性沥青混合料的应用实践 总被引:1,自引:0,他引:1
废旧轮胎胶粉改性沥青在安徽省尚处于试验研究阶段,并无相应规范指导设计与施工,通过总结实体工程的原材料制备、配合比设计、混合料施工以及检测等工序,为推广应用废旧轮胎胶粉改性沥青积累经验。 相似文献