共查询到18条相似文献,搜索用时 140 毫秒
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《石油沥青》2016,(2)
设计了3种再生方案对老化SBS改性沥青进行再生。采用软化点试验和测力延度试验,分析不同再生方案下,老化SBS改性沥青的再生效果和性能改善程度;采用荧光显微分析技术,探究不同方案再生SBS改性沥青的微观相态结构。结果表明,添加再生剂或再生剂+岩沥青进行再生,可改善老化SBS改性沥青的黏稠度和延展性,但SBS在沥青相中仍处于絮状分布状态,沥青的韧性无法恢复;添加再生剂+SBS改性沥青或RST高黏度改性沥青进行再生,不仅能改善老化SBS改性沥青的黏稠度和延展性,还使沥青中的SBS数量得到补充,使得老化SBS改性沥青的韧性显著提高。其中,RST沥青调合改性再生沥青的韧性可达到甚至超过原样SBS改性沥青。 相似文献
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为研究沥青薄膜加热试验方法的合理性,选取山东地区常用的70号沥青和SBS I-D聚合物改性沥青,通过粘温曲线分别确定70号沥青和SBS沥青的拌和温度,然后分别进行常规温度下的薄膜加热试验和拌和温度下的薄膜加热试验。试验结果表明,在拌和温度下的老化后针入度、延度均有明显的衰减,黏度随老化温度的升高而增大,软化点没有明显的变化规律。结合老化后的粘温曲线与施工现场的实际情况,得出70号沥青混合料的压实温度宜采用老化沥青黏度为0.28 Pa·s±0.03 Pa·s时的温度作为热拌沥青混合料的压实成型温度~([1]),SBS I-D改性沥青混合料的压实温度宜采用老化沥青黏度为0.45 Pa·s±0.05Pa·s时的温度作为聚合物改性沥青混合料的压实成型温度~([2])。 相似文献
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我国改性沥青的储存稳定性分析目前都是采用交通部的JTG F40—2004规范,通过测试离析管上、下层沥青的软化点的差值作为SBS改性沥青储存稳定性的评价指标,该指标在一定程度上可以反映改性沥青在热储存过程中性质变化情况,但SBS改性沥青在热储存过程中的性质变化具有复杂性,仅以软化点的变化并不能全面表征其性质的变化情况。基于此,本研究提出一种新的SBS改性沥青储存稳定性评价指标,该指标是将离析管上、下部分的软化点、黏度和延度分析相结合,把离析管上、下部分的软化点差、黏度差和延度差作为SBS改性沥青储存稳定性评价指标。结果表明这种新指标评价SBS改性沥青储存稳定性比现行方法更全面、更有效。 相似文献
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W. Huang 《Petroleum Science and Technology》2013,31(17):2108-2114
Abstract The penetration, softening point, and ductility of the aging basic asphalt and styrene-butadiene-styrene (SBS) modified asphalt were studied, and the thin film oven aging behavior of them was researched by using infrared spectrum. The experimental results showed that the softening point was increased, the penetration and ductility were decreased after basic asphalt thin film oven aging; the results of aging SBS modified asphalt thin film oven aging was similar too. The research of infrared spectrum indicated that absorbing–oxygen oxidation reaction was taking place when basic asphalt film was aging, carbonyl and sulfoxide groups were increased after SBS modified asphalt thin film oven had been aging. The aging extent of SBS modified asphalt was bigger than basic asphalt and the ability of bearing low temperature was better. SBS modified asphalt could have worse anti-aging performances than that of base asphalt. 相似文献
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AbstractThe effects of different types (red, black and blue color) and content (2% and 4%) of thermochromic powders on aging properties of styrene-butadiene-styrene copolymer (SBS) modified asphalt were investigated. Physical properties of the binders (ductility, penetration, viscosity and softening point) were tested before and after thermal-oxidative and ultraviolet radiation aging. The results showed thermochromic powders improved the deformability and weakened the high-temperature performance of SBS modified asphalt to some extent. Thermochromic powders could obviously improve the anti-aging properties of SBS modified asphalt. In addition, SBS modified asphalt with 2% thermochromic materials showed the best aging resistance under all aging modes. 相似文献
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高温稳定性是沥青胶结料重要技术要求之一。针入度、软化点、60℃动力黏度和针入度指数是工程中最为常用的高温性能评价指标。为探究这些高温性能指标的区分度和关联性,对34种源于不同工程的沥青胶结料进行检测,基于聚类分析法和灰色关联分析法对试验数据进行分析。结果表明,60℃动力黏度指标相比针入度和软化点指标能够更有效地区分不同沥青胶结料的高温性能;70号基质沥青和高黏度改性沥青的60℃动力黏度与软化点关联度高,但SBS改性沥青60℃动力黏度与其他高温性能指标的关联度低;考虑到动力黏度能够客观表征流变特性,建议在实际工程中可将60℃动力黏度列为强制性指标。 相似文献
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本文对30余个沥青样品进行了动态剪切扫描试验,探讨了软化点环境下的沥青的粘弹性状态。试验发现:在软化点温度条件下,纯沥青与改性沥青处于两种不同的流变状态,石油沥青粘弹组成中粘性分量居多,相位角多在80o以上;而SBS改性沥青则保持较低的模量值和相位角,弹性仍保持为一个明显的特质。同时,利用Shapiro-Wilk正态检验发现,在a=0.05置信水平下,不管老化状态如何,纯沥青软化点对应一个稳定的复数模量,在荷载100Pa、频率10rad/s的实验条件下,该模量均值为13033.7Pa,标准差为2104.7Pa。并利用这种等模量规律求取纯沥青的软化点,证明了与实测软化点的良好关联性。需要更多数据以验证本文的初步结论。 相似文献
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In this paper we investigate the reinforcement mechanism of high viscosity rubber/SBS modified asphalt mortar mixed with fiber (mineral, lignin or carbon fiber) and deoiled asphalt (DOA). The softening point, penetration and viscosity tests were conducted to characterize the engineering properties of asphalt-fiber mortar. The microstructure of fiber was observed using scanning electron microscopy (SEM), and the results indicated that fiber can effectively improve the toughness of asphalt matrix through forming a spatial network structure, and then adhesion and stabilization of asphalt binder. The cone penetration test was designed to study the rheological property of fiber modified asphalt. The results indicated that the reinforcement effect increased with fibers and DOA fraction increasing to a certain threshold, and the optimal fiber content was dependent on the fiber type and its length. Fiber content and filler-asphalt ratio had significant effects on the softening point, penetration, viscosity and cone penetration of asphalt mortar. 相似文献