共查询到20条相似文献,搜索用时 15 毫秒
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Mohammed Farhat Ali I.M. Asi H.I. Al-Abdul Wahhab I.A. Al-Dubabe 《Petroleum Science and Technology》1999,17(1):125-145
The rheological properties of polymer modified Arab asphalts were characterized using both routine test methods, such as penetration and softening point, and more rigorous methods, which included low temperature stiffness measurements using a bending beam rheometer, and dynamic mechanical analysis using dynamic shear rheometer. HP-GPC method of analysis was used to produce profiles of the molecular size distribution of the modified asphalts. Models were built to predict the rheological and performance-based properties from the HP-GPC profiles. The results indicated that polymer modification is capable and effective in improving the neat Arab asphalt binders rheological properties to meet and satisfy the performance requirements of the Gulf countries. 相似文献
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USE OF THE ENVIRONMENTAL SCANNING ELECTRON MICROSCOPE TO INVESTIGATE THREE POLYMER MODIFIED ASPHALTS
Laurent C. Michon Theresa M. Williams Francis P. Miknis Jean-Pascal Planche Didier Martin 《Petroleum Science and Technology》2013,31(7-8):797-809
ABSTRACT Polymer modified asphalts present an opportunity to enhance the properties of asphalt concrete for road building where conventional asphalts are not appropriate. In this field, researchers have proposed different kinds of chemical and physical techniques to define the properties of these materials. At the same time, microscopic techniques were being developed to visualize the microstructure of the asphalt. In this paper another microscopic technique using Environmental Scanning Electron Microscopy (ESEM) to investigate the morphological structures of neat polymers and commercial polymer modified asphalts is presented. Samples examined present different kinds of morphology easily observable by ESEM. The two commercial polymer modified asphalts show numerous differences, but after heat treatment they lost their macrostructure. 相似文献
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Mohammed Farhat Ali I.M. Asi H.I. Al-Abdul Wahhab I.A. Al-Dubabe 《Petroleum Science and Technology》2013,31(1-2):125-145
Abstract The rheological properties of polymer modified Arab asphalts were characterized using both routine test methods, such as penetration and softening point, and more rigorous methods, which included low temperature stiffness measurements using a bending beam rheometer, and dynamic mechanical analysis using dynamic shear rheometer. HP-GPC method of analysis was used to produce profiles of the molecular size distribution of the modified asphalts. Models were built to predict the rheological and performance-based properties from the HP-GPC profiles. The results indicated that polymer modification is capable and effective in improving the neat Arab asphalt binders rheological properties to meet and satisfy the performance requirements of the Gulf countries. 相似文献
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针对克拉玛依沥青难以改性,产品稳定性差等问题,本研究采用化学改性法,对比分析了4种基质沥青在改性前后的元素组成、红外光谱、族组成、分子量的变化以及SBS改性沥青的常规性质的差异。结果表明:相对于物理改性,化学改性不仅显著降低了SBS改性沥青的反应温度,而且还提高了SBS改性沥青的高温性能。 相似文献
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通过对加入不同剂量SBS改性剂、相容剂、稳定剂的SBS改性沥青的基本性能和动态剪切流变性能的考察,研究这几种添加剂在SBS改性沥青中的作用及作用机理。研究发现:SBS改性剂能提高沥青的粘弹性,随着剂量的增加沥青的低温和高温性能变好;相容剂能增加沥青中芳香组分,提高SBS与沥青的相容性,但随着剂量的增加沥青的针入度和延度增大,沥青的弹性性能降低,粘性也减小;稳定剂能使SBS在沥青中形成稳定均匀分布的网络结构,稳定剂剂量占SBS量约5%为宜,随着剂量的增加沥青软化点和粘度提高,弹性增大,粘性减小。 相似文献
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SBR胶乳改性沥青机理的研究 总被引:2,自引:0,他引:2
选取了国内外十一种沥青为基础沥青,将SBR胶乳按不同的比例加入其中制备成改性沥青。观察微观结构,拍摄微观照片,以SBR在沥青中的相态结构作为评价沥青与SBR之间相容性的依据,并通过测定各种性能研究了沥青与SBR的相容性,沥青对SBR的敏感性和改性效果之间的关系。 相似文献
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道路石油沥青中蜡对沥青性质的影响 总被引:4,自引:3,他引:1
测定了大庆和辽河100号道路石油沥青中蜡的分布,并将其中的饱和蜡,芳香蜡,总蜡分离出来,用其与脱蜡沥青调制成蜡含量不同的系列样品,考察了饱和蜡,芳香蜡对沥青物理性质的影响,总蜡对沥青路用性能的影响,对沥青质量指标中否应设置蜡含量指标进行了讨论. 相似文献
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《Petroleum Science and Technology》2013,31(9-10):1229-1249
The Gulf Countries' environmental conditions are very severe. The temperature zoning study indicate that more than half of Gulf areas experience a maximum seven consecutive days pavement temperature of 76°C (Al-Abdul Wahhab et al., 1997). This has resulted in damage to the road networks in the form of cracking, rutting and deformation. Polymer modification of asphalt is required to increase the resistance to permanent deformation at relatively high temperatures without adversely affecting the properties of the asphalts at low temperature. In this work chemical and performance-related properties of fresh, oxidized, and polymer modified asphalts were evaluated. The physical properties and performance characteristics of asphalts were found to depend on the chemical composition of asphalt. The interactions of polar functionalities actually present or formed during oxidative aging or due to polymer modification, influence the viscosity and related flow properties. The changes in composition of fresh, oxidized and polymer-modified asphalts can be clearly identified from Infrared spectroscopy. NMR spectroscopy enables detailed information about the Carbon-and-hydrogen-types and average molecular/structural parameters of asphalt without separating it into different components. 相似文献
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高粘度改性沥青的性能评价 总被引:1,自引:1,他引:0
根据虹桥综合交通枢纽工程钢桥面铺装的技术要求,对国产高粘度改性沥青进行了沥青性能和混合料性能的评价试验,并与某进口高粘度改性沥青进行了对比。试验结果表明:国产高粘度改性沥青与进口高粘度改性沥青的性能相当,两种沥青均符合工程的技术要求,并具有优异的路用性能。此外,测试了不同温度条件下国产高粘度改性沥青的粘度,试验结果表明在高温条件下,该沥青的粘度与普通的改性沥青差异很小,其混合料生产和施工温度可参考普通的改性沥青的相关规定执行。 相似文献
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CHANGES IN ASPHALT CHEMISTRY AND DURABILITY DURING OXIDATION AND POLYMER MODIFICATION 总被引:1,自引:0,他引:1
The Gulf Countries' environmental conditions are very severe. The temperature zoning study indicate that more than half of Gulf areas experience a maximum seven consecutive days pavement temperature of 76°C (Al-Abdul Wahhab et al., 1997). This has resulted in damage to the road networks in the form of cracking, rutting and deformation. Polymer modification of asphalt is required to increase the resistance to permanent deformation at relatively high temperatures without adversely affecting the properties of the asphalts at low temperature. In this work chemical and performance-related properties of fresh, oxidized, and polymer modified asphalts were evaluated. The physical properties and performance characteristics of asphalts were found to depend on the chemical composition of asphalt. The interactions of polar functionalities actually present or formed during oxidative aging or due to polymer modification, influence the viscosity and related flow properties. The changes in composition of fresh, oxidized and polymer-modified asphalts can be clearly identified from Infrared spectroscopy. NMR spectroscopy enables detailed information about the Carbon-and-hydrogen-types and average molecular/structural parameters of asphalt without separating it into different components. 相似文献
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Three different types of storage stability of SBS modified asphalts were investigated by hot storage test. It's found that during hot storage the performance of SBS modified asphalt deteriorated although phase separation didn't happen. Mechanism of storage stability of SBS modified asphalt was discussed. The different hot storage stability of three SBS modified asphalts could be well interpreted with the interface layer principle. Based on the interface layer principle, a new way that asphalt was chemically modified by SBS was put forward to improve hot storage stability and other using performances. The results indicated that the asphalt chemically modified by SBS had good hot storage stability and other using performances were significantly improved. Fluorescence microscopy was used to study SBS modified asphalt phase morphology, and the SBS chemically modified asphalt showed two interlocked continuous phases. 相似文献
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《Petroleum Science and Technology》2013,31(5-6):901-910
Abstract Three different types of storage stability of SBS modified asphalts were investigated by hot storage test. It's found that during hot storage the performance of SBS modified asphalt deteriorated although phase separation didn't happen. Mechanism of storage stability of SBS modified asphalt was discussed. The different hot storage stability of three SBS modified asphalts could be well interpreted with the interface layer principle. Based on the interface layer principle, a new way that asphalt was chemically modified by SBS was put forward to improve hot storage stability and other using performances. The results indicated that the asphalt chemically modified by SBS had good hot storage stability and other using performances were significantly improved. Fluorescence microscopy was used to study SBS modified asphalt phase morphology, and the SBS chemically modified asphalt showed two interlocked continuous phases. 相似文献
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甲基丙烯酸缩水甘油酯接枝低密度聚乙烯沥青改性剂改性机理研究 总被引:6,自引:0,他引:6
分别用低密度聚乙烯(LDPE)以及甲基丙烯酸缩水甘油酯接枝低密度聚乙烯(GMA-g-LDPE)对中海36-1基质沥青进行改性,研究了软化点、低温延度以及高温储存稳定性随着改性剂含量变化而变化的规律.通过动态剪切流变试验(DSR)和弯曲梁流变试验(BBR)测试表明,GMA-g-LDPE改性中海36-1基质沥青的高温、低温性能分别优于LDPE改性中海36-1基质沥青.通过荧光光学显微镜观察发现,两种改性沥青的相态区别较大.两种改性沥青与基质沥青的FTIR比较显示,不同吸收峰有一定的变化, GMA-g-LDPE改性中海36-1基质沥青的FTIR验证了GMA-g-LDPE中的环氧基团与沥青体系中官能基团发生了反应.研究推断,GMA-g-LDPE与中海36-1基质沥青之间形成的网络结构导致了GMA-g-LDPE改性中海36-1基质沥青的性能优于LDPE改性中海36-1沥青. 相似文献