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采用动态剪切流变试验(DSR)研究了三种不同沥青胶结料在应变控制、应力控制加载模式下的疲劳性能。采用N_(f50)、N_1、N_(P20)和N_(fm)四种疲劳评价指标分析了不同加载模式对沥青疲劳寿命的影响。试验结果表明,加栽模式对沥青疲劳寿命有显著影响,同一种沥青在不同加载模式下的疲劳寿命差异较大,且三种沥青在不同加载模式下的疲劳寿命排序不一致;不同加栽模式下,四种评价指标对同一沥青进行疲劳性能评价时,具有排序一致性,都为N_1N_(p20)N_(f50)N_(fm);在应变控制加载模式下沥青疲劳寿命的区分度比应力控制加载模式下的大得多,应变控制加载模式的疲劳试验更适合来评价不同沥青的疲劳性能。 相似文献
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对高强度沥青与SBS改性沥青、70号沥青的性能进行对比检测,着重进行50℃、60℃下的动态剪切试验,以车辙因子(G^*/sinδ)评价三种沥青的抗永久变形能力。结合室内试验,对AC-20型混合料的高温稳定性、水稳性、低温抗裂性以及疲劳性能等路用性能进行对比研究。研究结果表明,高强度沥青在50℃、60℃的G^*/sinδ远高于其他沥青粘结料,能够大幅提高混合料的高温性能,而且对其他路用性能也有一定改善。 相似文献
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为了研究高模量沥青混合料的综合路用性能,通过对AC-25C(30号)、AC-20C(30号)、AC-20C(70号SBS)、AC-25C(70号)沥青混合料的高温性能、低温性能、疲劳寿命和水稳定性等试验研究。对比试验和分析了不同沥青混合料的路用性能,从而比较出高模量沥青混合料的优越性。 相似文献
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《石油沥青》2017,(5)
通过两种试验方法,改变试验条件,研究层间粘结状况对层间剪切强度和剪切疲劳寿命的影响。试验结果表明:粘层油为改性乳化沥青的层间剪切强度要大于乳化沥青,且存在一个粘层油最佳用量0.6 kg/m~2;20℃层间剪切强度约是60℃的7倍,表明高温下沥青路面更容易发生剪切滑移破坏;层间剪切疲劳寿命的排序是改性乳化沥青乳化沥青无粘层材料,当应力比从0.1变化到0.2时,层间剪切疲劳寿命减小了70%左右,表明外界荷载作用的微小变化可能会使得层间抗剪切疲劳性能严重下降;乳化沥青和改性乳化沥青的层间无污染的剪切疲劳寿命分别是是层间污染的2.5倍和2.9倍,因此在施工时要采取措施防止粘层油被污染。 相似文献
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为了研究矿粉的加入对乳化沥青残留物路用性能影响的特点及规律,利用动态剪切流变仪、弯曲梁流变仪以及压力老化仪分别对原样乳化沥青残留物及其各粉胶比条件下组成的胶浆,通过温度扫描、频率扫描、多应力重复蠕变试验、弯曲梁流变试验以及疲劳加载评价其高低温及疲劳性能。结果表明:高温条件下,矿粉的加入使得乳化沥青残留物粘性分量更明显,黏度应作为评价其性能的重要指标;低温条件下,温度下降一个等级(6℃)与保持温度不变将粉胶比由0.6提升为1.4对胶浆的劲度模量影响相当;矿粉的加入使得乳化沥青残留物疲劳点提前出现并且会加剧裂纹损伤在材料内部的扩展速度。 相似文献
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将氢氧化镁、红磷和十溴二苯乙烷分别均匀混入SBS改性沥青中制备阻燃沥青,利用红外光谱分析仪探究阻燃剂与沥青的化学反应情况,然后通过室内试验分析阻燃剂掺量对沥青基本性能和阻燃性能的影响,最后通过基于动态剪切流变仪(DSR)的疲劳-愈合-疲劳试验研究了阻燃剂和愈合温度对沥青疲劳与自愈合性能的影响规律。结果表明:红外光谱分析结果表明阻燃剂与沥青之间没有发生明显的化学反应;阻燃剂虽然提高了沥青材料的阻燃性能,但是降低了沥青的施工和易性和存储稳定性;随阻燃剂掺量增加,沥青的疲劳与自愈合性能先升高后降低,存在最佳阻燃剂掺量;在不同愈合温度下,适量阻燃剂均能提高SBS改性沥青的疲劳与自愈合性能。 相似文献
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SBR改性沥青的低温性能评价 总被引:3,自引:0,他引:3
主要对三种国产基质沥青和六种丁苯橡胶(SBR)改性沥青进行了测力延度试验(FDT)、常规技术指标试验以及SHRP的动态剪切仪(DSR)和弯曲梁流变仪(BBR)试验,并且将FDT中采用的粘弹比、拉伸柔度、应变能等指标与沥青的当量脆点(T1.2)、以及损失模量、弯曲劲度模量(S)、斜率(m)相比较,结果显示FDT所选的三个评价指标与SHRP的评价指标有良好的相关性,从而说明了采用FDT对沥青结合料在老化、疲劳综合作用下的低温性能进行评价的经济合理性以及选择三个评价指标的可靠性。 相似文献
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Shenghua Wu 《Petroleum Science and Technology》2018,36(9-10):696-703
This study evaluated the ductility properties of sixty-nine different types of asphalt extracted from the field projects using dynamic shear rheometer (DSR) monotonic and oscillation test. These extracted asphalts were subjected to field aging. The ductility of asphalt mixture was also characterized by indirect tensile test. It was found that test temperature had effect on property measurement. Failure strain measured at 5°C from monotonic test correlated well with DSR function measured from oscillation test. Both higher failure strain and lower DSR function indicated a better ductility of asphalt, and were also indicative of ductility of asphalt mixture. Failure strain would be potentially used to separate polymer-modified asphalt from non-polymer-modified asphalt. 相似文献
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采用测力度试验方法对沥青马蹄脂的力学性能进行了测试分析,并将部分结果与DSR试验结果做了对比,结果表明,测力延度试验所得到的马蹄脂力系数能够反映材料配比参数的影响,建议采用破坏应变和最大拉力作为评价马蹄脂力学性能的指标。 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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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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Aliasghar Akbari Nasrekani Koorosh Naderi Mostafa Nakhaei Nader Mahmoodinia 《Petroleum Science and Technology》2016,34(21):1783-1789
This article investigates the effect of addition of gilsonite (natural bitumen) to asphalt binder on its rheological behavior at high temperatures through construction of complex modulus (G*) master curve using dynamic shear rheometer (DSR) test. This impact is further investigated by evaluation of performance of asphalt concrete modified with gilsonite at elevated temperatures using repeated dynamic creep test. The results showed that introduction of gilsonite to asphalt binder increases its stiffness and elasticity. Also, the results indicated that the modification of asphalt concrete with gilsonite improved rutting resistance significantly. 相似文献
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在实验室内对脱水后的奥里乳化原油及其与孤岛减压渣油调合油,采用减压蒸馏工艺,制取重交通道路沥青,并全面分析评价了所制取的重交通道路沥青性质。试验证明,脱水奥里乳化原油减压蒸馏制取的沥青除薄膜烘箱试验后质量变化外,其它所有指标均符合重交通道路沥青质量要求,完全符合交通部“八五”攻关建议重交通道路沥青技术要求。脱水奥里乳化原油与孤岛减压渣油调合,在一定的减压蒸馏工艺条件下,制取的沥青不仅符合GB/T15180-94及GB50092-96沥青质量要求,也符合交通部“八五”攻关建议重交通道路沥青技术要求 相似文献
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橡胶沥青的动态剪切流变试验分析 总被引:2,自引:0,他引:2
通过动态剪切流变试验,对路用橡胶沥青结合料的流变性能进行了分析。试验采用2种不同类型的基质沥青以及4种不同含量的胶粉制备成5种不同类型的橡胶改性沥青,使用动态剪切流变仪分别对原样、短期老化以及长期老化三种状态的试样进行了测试,分析了各粘弹性参数随橡胶沥青类型变化的规律。同时也对比分析了各种类型的胶粉改性沥青的高温抗车辙性能和抗疲劳性能。试验结果表明,橡胶胶粉含量在15%~21%范围内时,橡胶沥青的高温和中等温度下疲劳性能均随橡胶胶粉含量的增加而提高。 相似文献