共查询到19条相似文献,搜索用时 203 毫秒
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本文通过收缩开裂试验测定几种国产稠油沥青和进口沥青、沥青混合料的收缩系数、脆点,表征沥青混合料收缩系数同温度、升温速率的关系.并通过对比证明国产稠油沥青同进口沥青低温性能相当。 相似文献
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石油沥青的脆点(脆化温度),表征石油沥青低温流变性质,和沥青的低温使用性质相关联。在我国广大的北方,因冬季气候寒冷,在沥青路面施工时需了解石油沥青的脆点,以便预测沥青路面的低温抗裂性能。交通部 JTJ52-83“公路工程沥青及沥青混合料试验规程”中列的沥青脆点试验方法,是目前国际上许多国家早年提出的弗氏脆点法,完全是手工操作,影响因素很多,如仪器的精密度、试样重量准确度、制片、降温速度和试验人员操作的熟练程度等,哪一方面有问题都能造成较大的误差。同样试样和仪器,不同的试验人员操作测出的脆点 相似文献
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石油沥青用于道路铺筑和屋面建筑为最多。对于石油沥青除要求它有良好的粘结性、不透水性外,还要求它在较高温度下不流淌,低温下不脆裂。石油沥青的低温性能是一项重要指标。目前用于石油沥青低温性能的检测手段,除进行不同温度下的针入度、延度等流变性能和收缩率的测定外,在国际上较多的国家采用 A·Fraass 所建立的脆点测定法。石油沥青的脆点是将约0.4克的样品, 相似文献
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作为沥青在低温时的力学试验是弗拉斯脆点试验,但该试验的测定值偏差很大且仅能测定断裂温度。笔者对弗拉斯脆点试验仪进行改进后,不仅能测定断裂温度,还能测定所加的载荷。本文主要介绍的是用笔者新开发的试验仪,在低温时对沥青进行弯曲试验的结果。预先测定出钢片的应变,然后将沥青均匀地涂在该钢片上做为试件。在各温度下 相似文献
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以90#普通沥青为原料,苯乙烯-丁二烯嵌段共聚物(SBS)为改性剂,橡胶类复合改性剂为添加剂,调和油为软化剂,在后三者加入质量分数依次为6%,6%,40%的条件下,制备出低温水工沥青,并对工业试生产的低温水工沥青及其混凝土性能进行了评价。结果表明:试生产的低温水工沥青具有良好的耐高低温性能,产品性质稳定,脆点达到-28℃,延度(5℃)达到84 cm以上,薄膜烘箱实验后脆点略有上升;低温水工沥青混凝土孔隙率、斜坡流淌值等均满足DL/T 5411—2009要求,其拉伸应变(0℃)和弯曲应变(0℃)高于基质沥青混凝土。 相似文献
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本试验研究了沥青的密度与温度和针入度之间的关系。A原油生产的AH-30、AH-50、AH-70、AH-90、AH—110五种沥青用于关联密度与温度、密度与针入度之间的关系。B原油生产的AH-50,AH-60,AH-90,AH—110四种沥青用于验证针入度与密度之间的关系。研究得出:沥青的密度与温度呈直线关系。不管测定密度的温度与测定针入度的温度是否相同,针入度的对数与沥青的密度都呈直线关系。对来源于同-种原油的沥青,温度与密度回归方程的斜率相同。密度与针入度的对数回归方程的斜率和截距呈直线关系。 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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采用氧指数测定法、动态剪切流变实验、弯曲梁流变实验和DSC-TG实验、扫描电镜(SEM)手段研究了环保型SBS改性阻燃沥青的性能;通过研究环保型阻燃剂对SBS改性沥青阻燃性能、物理性能、135 ℃运动黏度和高低温流变性能的影响确定了环保型阻燃剂的加入量;检测了环保型SBS改性阻燃沥青的环保性能。结果表明,环保型SBS改性阻燃沥青具有良好的阻燃性能、物理性能、热储存稳定性及环保性能,环保型阻燃剂可以提高SBS改性沥青的高温性能,但会影响低温性能;环保型阻燃剂的加入可以提高SBS改性沥青的热分解温度和开始燃烧温度,并且在沥青燃烧时可以减少烟密度及有毒烟气的释放。 相似文献
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对于褶皱和断层都发育的复杂构造区块,裂缝发育不仅受地层变形(褶皱)影响,还受断层影响;如何建立裂缝发育密度与褶皱和断层之间的定量关系式,是实现裂缝发育密度定量预测的关键.前人虽然对复杂构造区块的裂缝发育密度与断层和褶皱之间的关系进行过研究,但以定性描述为主,未能实现定量化.文中以普光气田长兴组、飞仙关组为例,在建立裂缝发育密度与地层变形(构造曲率)之间的定量关系时引入距断层距离参数,在建立裂缝发育密度与断层之间定量关系时引入构造曲率参数,较好地建立了复杂构造区块裂缝发育与构造曲率和断层之间的定量关系式,为实现裂缝发育密度的定量预测提供了一条有效途径. 相似文献