共查询到19条相似文献,搜索用时 187 毫秒
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选择Sasobit和Evotherm 3G两种温拌剂对温拌LDPE沥青混合料制备工艺和性能进行研究。首先,比较变温等体积法和等黏温度法两种方法,并确定两种温拌混合料的拌和及击实温度。在此基础上,分别采用车辙试验、低温弯曲试验、中点加载弯曲试验以及冻融劈裂试验评价70#、LDPE、Sasobit-LDPE以及3G-LDPE四种沥青混合料的高温性能、低温性能、疲劳性能和水稳定性。结果表明,两种温拌技术均是可行的,Sasobit和3G温拌技术可使施工温度降低20℃和15℃。与热拌LDPE沥青混合料相比,Sasobit温拌沥青混合料具有更好的高温性能和水稳定性,在高应力比条件下抗疲劳性能更好,低温性能虽变差,但是优于70#沥青混合料;3G温拌沥青混合料的高温性能,低温性能以及水稳定性则与热拌LDPE沥青混合料各项性能较为接近,抗疲劳性能变差,但是优于70#沥青混合料。 相似文献
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对春风塔河优质道路沥青性质、化学组成进行分析,对其PG分级、混合料性能进行评价。结果表明:春风塔河优质道路沥青四组分构成比例较好,针入度指数适中、软化点和动力黏度(60 ℃)高、低温延度大、蜡含量低、残留针入度比和残留低温延度大;PG分级为PG64-28,感温性好,耐热老化性能优良,抗高温变形、低温抗裂及抗疲劳性能良好,低温抗裂性能尤其突出;混合料性能良好,适合在气候变化大的新疆地区应用。 相似文献
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欢喜岭重交通道路沥青SHRP性能研究 总被引:1,自引:1,他引:0
应用Superpave沥青胶结料试验动态剪切试验、压力老化试验和弯曲梁流变试验评定欢喜岭重交通道路沥青的抗永久变形、抗低温开裂和抗疲劳开裂性能,确定欢喜岭重交沥青最高和最低路面设计温度及PG等级,表明欢喜岭重交沥青满足我国广阔地域的使用要求。 相似文献
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多聚磷酸改性沥青研究 总被引:2,自引:0,他引:2
通过组分分析、流变力学试验及常规试验,揭示了多聚磷酸可以改变沥青的胶体结构形态的改性机理;对多聚磷酸的适宜剂量进行了优化及论证;优化出的多聚磷酸改性C级石油沥青的感温性大幅度下降,抗车辙性能显著提高,可由PG52—22级提升至PG70—22级;多聚磷酸对沥青的低温及疲劳特性无不良影响,但是,经薄膜老化后,改性沥青的弹性分量显著增大,抗短期老化性能下降。研究结论可作为工程应用的基础。 相似文献
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The asphalt modified with different printed circuit boards(PCBs) content(0, 5%, 10%, and 15%) was prepared in this study. The general properties, rheological properties, temperature sensitivity, fatigue resistance, and morphology of the PCBs modified asphalt were investigated by conventional tests, the Brookfield viscometry tests, the dynamic shear rheometer(DSR) tests, the bending beam rheometer(BBR) tests, and the fluorescence microscopy tests. And the influence of PCBs content on the above-mentioned properties was analyzed systematically. The results showed that the addition of PCBs could improve the high temperature performance, the low temperature performance, and the temperature sensitivity property of the modified asphalt, while compromising with the fatigue resistance of the modified asphalt. With the increase of PCBs content, the modified asphalt could have better softening points, viscosity, failure temperature, and temperature sensitivity, while its low temperature performance and fatigue resistance became worse to different degree. And the particle size of PCBs became bigger and non-uniform with an increasing PCBs content. According to the above-mentioned properties, the optimum PCBs content was specified at less than 10% in the modified asphalt system. 相似文献
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Gholamali Shafabakhsh Mana Motamedi Mahdi Firouznia Mehrdad Isazadeh 《Petroleum Science and Technology》2019,37(13):1495-1500
This research was performed to investigate the effect of nano-silica on the asphalt binder performance grade, rutting, and fatigue. The rutting and fatigue performance was tested by Multiple Stress Creep and Recover (MSCR) and time sweep test. The low-temperature cracking was tested by Bending Beam Rheometer test (BBR). The results showed the good performance of nano-silica in high and intermediate temperatures. The results of MSCR test show better performance in rutting and recovery as a result of the elastomeric property of nano-silica even in high temperatures. Nano-silica had a negative effect on the low performance grade of asphalt binder. The addition of nano-silica to asphalt binder increased the fatigue life up to 2.8 times. The Fourier transform infrared spectroscopy (FTIR) analysis was used for chemical analysis. 相似文献
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V. Selvavathi Vijai Arun Sekar V. Sriram B. Sairam 《Petroleum Science and Technology》2002,20(5):535-547
With increasing demand for higher performance, different modifications to asphalt are being explored. Asphalt is expected to become harder on modification thereby improving its life span. The modification further helps asphalt in developing resistance to cracking/fatigue at low temperatures and stability with minimum creep at higher temperatures. Polymers and rubber are being blended with asphalt to obtain good low temperature as well as high temperature performance. Various factors such as polymer chemical nature, molecular weight and particle size play a crucial role in determining the effect of modified asphalt properties. The effect of these factors and physical/chemical interaction between the additive and asphalt has not yet been fully established due to limitations in appropriate evaluation methodologies. This paper attempts to evaluate the improvements in modification of asphalt due to the addition of an elastomer and a reactive polymer, relatively. The evaluation is made more reliable and valid by considering all the three key characteristics namely cohesion, adhesion and durability aspects of the asphalt as the basis to highlight the improvements in application benefits. 相似文献