共查询到16条相似文献,搜索用时 187 毫秒
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稠度在沥青性能研究中的应用 总被引:1,自引:0,他引:1
沥青的性能是比较复杂的,使用新开发的稠度仪经大量试验以厦与之相关的混合料车辙试验,从而更有效的评价沥青性能。45℃或60℃稠度试验以厦与之相对应的车辙试验表明,以普通沥青的稠度和改性沥青回归后的稠度能比较好的反映沥青抵抗高温的能力。 相似文献
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1971年宾州运输局(Pennsylvarlia Department of Transportation,采用了与 AASHTO M226—70相似的粘度级粘稠沥青规格。AC—20粘稠沥青是在宾州铺路中使用最普遍、由利用不同的混合原油和不同的加工方法的炼厂生产出的符合宾州 DOT 规格的沥青来供应的。本文所做的是编录和评价各炼厂在1973年供应的AC—20粘稠沥青的物理性质。对基本的和经验的稠度数据做了评价和比较以便将来使规格能完全建立在基本单位测量的基础之上。试验数据对别的研究者和正在采用粘度分级粘稠沥青的机构也是适用的。不试图把坜青的物理性质与混合料的特性或铺装效果关联起来。在下列的数据之间获得了很好的关联:(a)25℃粘度的对数与25℃针入度的对数,(b)15.6℃时的粘度的对数和针入度的对数,(C)25℃和15.6℃时的粘度,(d)25℃至60℃和60℃至135℃之间的温度感受性,(e)25℃和15.6℃的粘度比。不论原油的来源如何,在26℃时的剪切感受性和薄膜烘箱试验后15.6℃的延度之间获得了满意的关联,表明在规格中剪切感受性可以用来代替延度要求。 相似文献
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道路沥青零剪切粘度与毛细管粘度的比较研究 总被引:1,自引:0,他引:1
粘度是评价道路沥青粘结特性的重要技术指标,也是条件性指标,不同测试方法得出粘度指标差异极大。基于沥青在路面结构中受力状态,对基质沥青、SBS、高强度、高粘度改性沥青等12种道路沥青60℃零剪切粘度、毛细管粘度进行比较研究,并对零剪切粘度测试方法进行简化。试验与分析表明:高粘度改性沥青在第一牛顿区共同区域范围内与沥青在路面结构中所受的剪切速率水平一致,零剪切粘度可以较为合理地表征沥青在路面结构中的粘结特性;高粘度改性沥青毛细管粘度存在虚高现象,无法有效表征高粘度沥青路用粘度特性,而基质沥青毛细管粘度对应的剪切速率在第一牛顿区域范围内,可作为零剪切粘度的替代指标,对基质沥青粘度性能进行评价。此外,建议利用剪切速率扫描试验进行零剪切粘度测试,取10-3~10-2s-1范围内测量粘度均值为零剪切粘度。 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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The density of asphalt was measured with the pycnometer and densitometer. Creep properties of the asphalt were investigated with the bending beam rheometer at temperatures ranging from 0 ℃ to -36 ℃. The asphalt density data used to correlate with the creep properties were calculated from the regression equation of density and temperature. The asphalt sample used to determine the creep property was aged by the standard RTFOT test and the PAV test. The test results showed that the asphalt density had a linear relationship with temperature changes. The logarithm of the creep stiffness and the slope of the logarithm of the stiffness at 60 seconds all demonstrated a linear relationship with the density, and the regression coefficient of these data was around 0.99. The creep stiffness and the slope of the creep stiffness can be calculated from the asphalt density at the same temperature. 相似文献
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Yufeng Cong Kejian Liao Wei Huang Yuchun Zhai 《Petroleum Science and Technology》2006,24(10):1187-1194
A dose of SBR modifier added to asphalt can improve asphalt's performance in stability, permanence, viscosity, and resistance to aging. Better application performances of asphalt pavement are affected directly by proper SBR modifying. This paper shows some investigations that confirm the relationship between the addition of SBR with the structure and the properties of SBR-modified asphalt. This paper also discusses the modified asphalt high temperature property, low temperature ductility, and mechanism of SBR-modified asphalt. The addition of SBR modifier showed an increase in viscosity, softening point, and elastic recovery of modified asphalt with rising temperature. When the temperature rises, the improvement of SBR-modified asphalt in softening point, elastic recovery, and visco-toughness result from SBR cross-linking. Although the lengths of low temperature ductility of SBR-modified asphalt are increased, the viscosities of modified asphalt increase; however, the softening point between the upper layer and lower layer were about 1.8°C after the isolated experiment. 相似文献
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《Petroleum Science and Technology》2013,31(10):1187-1194
Abstract A dose of SBR modifier added to asphalt can improve asphalt's performance in stability, permanence, viscosity, and resistance to aging. Better application performances of asphalt pavement are affected directly by proper SBR modifying. This paper shows some investigations that confirm the relationship between the addition of SBR with the structure and the properties of SBR-modified asphalt. This paper also discusses the modified asphalt high temperature property, low temperature ductility, and mechanism of SBR-modified asphalt. The addition of SBR modifier showed an increase in viscosity, softening point, and elastic recovery of modified asphalt with rising temperature. When the temperature rises, the improvement of SBR-modified asphalt in softening point, elastic recovery, and visco-toughness result from SBR cross-linking. Although the lengths of low temperature ductility of SBR-modified asphalt are increased, the viscosities of modified asphalt increase; however, the softening point between the upper layer and lower layer were about 1.8°C after the isolated experiment. 相似文献
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