共查询到20条相似文献,搜索用时 109 毫秒
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纯PS改性沥青的储存稳定性较差,SBS和反应剂的加入减小了PS改性沥青的颗粒尺寸,有利于PS的分散,提高了PS改性沥青的储存稳定性。 相似文献
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通过劈裂试验、三轴重复荷载试验和小梁弯曲试验对比了橡塑改性沥青混合料与SBS改性沥青混合料的性能,通过构建有限元模型分析了动荷载作用下沥青路面上面层裂缝的应力变化规律。结果表明,橡塑改性沥青混合料的抗拉性能与高温抗变形性能优于SBS改性沥青混合料,橡塑改性沥青可提高沥青混凝土路面的抗变形能力;橡塑改性沥青混合料的低温抗裂性能优于SBS改性沥青混合料,前者可提高沥青路面抗top-down裂缝开裂性能;在动荷载作用下,沥青路面结构层中的上面层拉应力逐渐增加,导致沥青路面发生top-down裂缝开裂,橡塑改性沥青混合料可增加上面层破坏时的最大拉应力,从而降低沥青路面发生top-down裂缝开裂的可能性。 相似文献
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丁苯橡胶改性沥青的高性能化和稳定化 总被引:9,自引:0,他引:9
在丁苯橡胶(SBR)改性沥青时加入稳定剂,运用反应共混方法研制出了高性能、高温贮存稳定的SBR改性沥青。利用动态力学性能分析和相形态观察分别比较了加入稳定剂对SBR改性沥青的动态力学性能和体系相形态在高温下的影响。结果表明,与未加稳定剂时相比,加入稳定剂的SBR改性沥青除能保持良好的低温性能之外,其高温物理机械性能有了明显的改善,且在高温下贮存数天后仍稳定。稳定剂的加入使得改性沥青体系内形成了弹性交联网络结构,显著改善了SBR改性沥青的高温贮存稳定性能和高温物理机械性能。 相似文献
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比较了直接添加LDPE、SBR改性沥青与LDPE/SBR熔融共混物改性沥青的高温贮存稳定性,并利用光学显微镜观察了各种改性沥青在高温下随时间的变化。结果表明:直接添加LDPE、SBR所得到的改性沥青,其高温贮存稳定性很差。而采用预先制备含有部分共聚物的LDPE/SBR共混物所得到的改性沥青能够在高温下稳定贮存。同时,相形态观察也表明,这种共混物改性沥青的高温相形态也不随时间变化,这一点与稳定性测试结果想吻合。 相似文献
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胶粉改性沥青的生产及其在公路建设中的应用 总被引:2,自引:0,他引:2
叙述了国内外用废轮胎胶粉改性沥青修筑公路的概况,我国用胶粉改性沥青的制法及其性能和国内外的标准,以及我国用胶粉改性沥青铺筑公路的设备和工艺方法及其使用情况和经济效益等的概况。 相似文献
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This study proposes a novel method to quantitatively evaluate the blending effect between aged asphalt and epoxy asphalt in epoxy asphalt-modified hot recycled asphalt mixture, based on three-dimensional confocal fluorescence microscopy technology. Samples of epoxy asphalt-modified hot recycled asphalt mixtures were prepared in a laboratory using new aggregates, epoxy asphalt, and reclaimed asphalt pavement materials that were simulated in the laboratory by subjecting new asphalt mixtures to a short-term and long-term aging process. Cube-shaped stone aggregates were designed to distinguish between new aggregates and reclaimed aggregates. The distribution of epoxy resin in the epoxy asphalt-modified hot recycled mixtures was tracked using a laser scanning confocal microscope. To address the depth attenuation issue caused by light absorption and scattering, as well as the overall intensity differences resulting from field depth differences and attenuation morphology, a depth compensation function and a feature weight allocation method were proposed. Results from the above method indicated that the degree of blending (DoB) ranged from 65% to 75% on the surface of new aggregates but from 45% to 70% on the surface of reclaimed aggregates. Most of the old asphalt still adhered to the surface of reclaimed aggregates after migration. The proportion of epoxy asphalt in the outer layer of asphalt film on new aggregates is higher than that on reclaimed aggregates. The DoB between the asphalt binders significantly decreased as the aging degree increased. Increasing the epoxy content reduced the viscosity of the epoxy asphalt and effectively improved the DoB between the new and old asphalt binders. 相似文献
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使用青川岩沥青和胶粉对基质沥青进行复合改性,在保持胶粉质量分数为20%不变的情况下改变岩沥青用量制得胶粉改性和岩沥青/胶粉复合改性沥青,通过针入度试验、动态剪切流变试验和重复应力蠕变恢复试验分别对改性沥青的宏观性能、储存稳定性、流变性能和变形恢复能力进行了分析,并采用Burgers本构方程模拟分析了改性沥青在持续应力加载下各组成变形部分占比的变化规律。结果表明,胶粉和岩沥青的加入均可大幅提高沥青的高温性能,使其变得黏稠;岩沥青的加入对于基质沥青的低温性能具有较强的削弱作用,但可改善其储存稳定性,而胶粉的加入可减小岩沥青对基质沥青低温性能的削弱作用;岩沥青的加入提高了改性沥青的抗车辙能力,使沥青弹性组分含量大幅增加,但并未对黏性组分产生较大影响,沥青抵抗较大荷载的能力得以增强,而应力敏感性则有所降低,复合改性沥青黏稠度缓慢增加的同时迅速变硬,在受较长时间的大荷载作用时变形也能较快恢复。 相似文献
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以中低温煤焦油沥青为原料,采用催化聚合法制备改质沥青,并在中低温煤焦油沥青中加入乙烯焦油和蒽油进行调和来提高改质沥青的流变性能,分别考察反应时间、反应温度及催化剂和交联剂的加入量对改质沥青的软化点、结焦值、甲苯不溶物含量和喹啉不溶物含量的影响。结果表明:加入乙烯焦油和蒽油调和可以有效提高改质沥青的流变性能,催化剂和交联剂按照1∶1的质量比加入,可以有效降低改质沥青的软化点,这是因为酸性催化剂和交联剂之间形成相对均相的反应体系,解决了改质沥青软化点高的问题。采用调和中低温煤焦油沥青制备改质沥青,筛选出的最佳工艺条件为:反应温度370℃,反应时间7h,催化剂和交联剂的加入量2.5%,该条件下制备的改质沥青的性质符合工业标准YB/T 5194-2015的要求,改质沥青的软化点为120℃,结焦值为56.28%,甲苯不溶物含量为30.52%,喹啉不溶物含量为8.21%,β树脂含量为22.31%。采用傅立叶变换红外光谱仪和偏光显微镜对制备出的改质沥青和中低温煤焦油沥青进行分析,初步推断出改质沥青中化合物芳环上的取代基明显增加且烷基取代的化合物大多数为芳烃分子,且在偏光显微镜下改质沥青中出现小球体,表明中低温煤焦油沥青在制备成改质沥青的这一过程中其相对分子质量变大,稠环芳烃含量增多。 相似文献
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《塑料、橡胶和复合材料》2013,42(2):43-49
AbstractThe properties of asphalt modified by styrene–butadiene–styrene, polyvinyl acetate and waste crumb rubber separately in a wide range of polymer loadings were studied in this paper. In analysing the relationship between polymer loading and modified asphalt properties, we found that the ductility of polymer modified asphalt measured at 5°C exhibited a percolation phenomenon, that is, as the loading of polymer exceeded a critical value, the ductility of modified asphalt changed abruptly. Furthermore, a percolation threshold differential existed. A rubber processing analyser, an optical microscope and a fluorescence microscope were used to characterise the microstructure of polymer modified asphalt and validate the occurrence of a polymer network in modified asphalt as a function of polymer loading. The percolation phenomenon of polymer modified asphalt was found to be associated with the polymer network in modified asphalt and can be well explained by the percolation mechanism of rubber toughened plastics. 相似文献
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