共查询到18条相似文献,搜索用时 187 毫秒
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马歇尔残留稳定度试验和冻融劈裂试验结果表明,加入纤维对沥青混合料的水稳性有明显改善作用,马歇尔残留稳定度从88%提高到92%以上.不同类型的纤维,提高程度略有不同,聚酯纤维稍逊于聚丙烯腈纤维,而聚丙烯腈纤维又弱于其与聚酯纤维混合配方.冻融循环试验结果表明,未掺纤维的沥青混凝土强度损失最大,聚丙烯腈纤维与聚酯纤维混合掺入... 相似文献
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通过板冲击、扫刷、拉拔和直剪试验,研究了玄武岩纤维沥青碎石封层(应力吸收层)的黏结性能.结果表明:乳化沥青用量和纤维用量对纤维沥青碎石封层的黏结性能具有较大影响,合理的纤维用量能起到很好的增黏作用,70mm长的玄武岩纤维和乳化沥青最佳用量分别为85g/m~2和1.9kg/m~2.通过板带直接拉伸、直剪和三点弯曲试验,进一步探讨了乳化沥青用量、纤维用量及其长度对纤维沥青碎石封层低温抗裂、层间黏结和抗反射裂缝性能的影响,验证了在最佳纤维和乳化沥青用量下,纤维沥青碎石封层试件的抗拉强度、抗剪强度及断裂能相较于不掺纤维试件分别提高约37.6%,28.0%和87.4%. 相似文献
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纤维沥青混凝土疲劳性能试验及寿命计算方法 总被引:1,自引:1,他引:0
通过应力控制模式下的劈裂疲劳试验,分析了不同掺量(纤维体积与沥青混合料体积之比)和长径比的聚酯纤维沥青混凝土劲度模量的衰减特征;结合损伤力学理论,提出了纤维沥青混凝土的疲劳破坏准则;在应力比-疲劳寿命(S-N)方程的基础上,建立了考虑纤维含量特征参数影响的纤维沥青混凝土疲劳寿命计算方法.结果表明:纤维含量特征参数能综合反映纤维掺量和长径比对沥青混凝土疲劳性能的综合影响;AC-13F型聚酯纤维沥青混凝土的最佳纤维掺量为0.35%,长径比为324,纤维含量特征参数值为1.13. 相似文献
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为探究不同纤维改性及其沥青混合料的路用性能,文中分别选取玄武岩纤维、聚酯纤维、陶瓷纤维制备改性沥青及沥青混合料。首先通过三大指标试验评价改性沥青的性能;其次通过车辙试验、低温小梁弯曲试验、冻融劈裂试验分别分析不同纤维沥青混合料的路用性能。研究结果表明,经过测试后,玄武岩纤维改性沥青性能居中,其沥青混合料的性能最佳。高温、低温以及水稳定性能比性能最差的聚酯纤维改性沥青混合料分别提升了77.8%,54.5%,11.3%。研究结果为不同纤维改性沥青在路面材料中的应用提供一定的理论指导价值。 相似文献
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聚酯纤维和木质素纤维这2种稳定剂常用于排水沥青混合料以提高其高温稳定性能。该文对比分析了掺加聚酯纤维和木质素纤维的OGFC-13沥青混合料的水稳定性能,通过浸水时间不同的马歇尔稳定度和循环次数不同的劈裂强度试验,得出排水沥青混合料OGFC-13的残留稳定度和冻融循环劈裂强度比的变化趋势。同时比较了2种纤维的标准飞散损失和浸水飞散损失。结果表明,在马歇尔残留稳定度、冻融循环劈裂强度和飞散损失的水稳定性试验中,掺聚酯纤维和木质素纤维的OGFC-13沥青混合料表现出不同的性能,不能笼统地说明哪种纤维改性排水沥青混合料性能的优劣。 相似文献
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《Construction and Building Materials》2010,24(10):2003-2010
This paper studies the reinforcing effects and mechanisms of fibers for asphalt concrete (AC) mixtures under the environment temperature and water effects. Four typical fiber types – polyester, polyacrylonitrile, lignin and asbestos – are studied. Laboratory tests were conduct on the fiber reinforced AC (FRAC) to measure its strength, strain and fatigue behavior. Results show that fibers have significantly improved AC’s rutting resistance, fatigue life, and toughness. The flexural strength and ultimate flexural strain, and the split indirect tensile strength (SITS) at low temperature have also improved. The polymer fibers (polyester and polyacrylonitrile) have improved rutting resistance, fatigue life, and SITS more significantly than lignin and asbestos fibers, which may be primarily due to their greater networking function; while lignin and asbestos fibers result in greater flexural strength and ultimate flexural strain, which may be primarily due to their greater asphalt stabilization effect. However, fiber’s effect under the water freezing–thaw effect does not seem promising, and the SITS of FRAC with lignin and asbestos fibers even reduces to some extent under this effect. It is also found that a fiber content of 0.35% by mass of mixture achieves the optimum performance outputs of rutting resistance and SITS for polyester fiber. 相似文献
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随着我国公路交通的快速发展,交通量迅速增加、车速提高、交通渠化、轴载增加以及普遍的车辆超载现象,对高等级公路沥青路面所用的沥青混合料性能提出了更高的要求。有关研究表明,聚酯纤维的加入可提高混合料的综合路用性能,并能够在一定程度上改善沥青砼路面的长期使用性能。本文在此基础上分析了聚酯纤维对沥青砼路用性能作用机理。 相似文献
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介绍了聚酯纤维的性能,阐述了聚酯纤维的作用机理,分析了聚酯纤维沥青混凝土与传统混凝土施工的不同点,并总结了纤维沥青混凝土施工中的注意事项,为推广应用该材料奠定了基础。 相似文献
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Use of environmentally friendly approaches with the purpose of strengthening soil layers along with finding correlations between the mechanical characteristics of fiber-reinforced soils such as indirect tensile strength(ITS) and California bearing ratio(CBR) and as well as the evaluation of shear strength parameters obtained from the triaxial test would be very effective at geotechnical construction sites.This research was aimed at investigating the influence of natural fibers as sustainable ones including basalt(BS) and bagasse(BG) as well as synthetic polyester(PET) fibers on the strength behavior of clayey soil.To this end,the effects of various fiber contents(0.5%,1% and 2%) and lengths(2.5 mm,5 mm and 7.5 mm)were experimentally evaluated.By conducting ITS and CBR tests,it was found that increasing fiber content and length had a significant influence on CBR and ITS values.Moreover,2% of 7.5 mm-long fibers led to the largest values of CBR and ITS.The CBR values of soil reinforced with PET,BS,and BG fibers were determined as 19.17%,15.43% and 13.16%,respectively.The ITS values of specimens reinforced with PET,BS,and BG fibers were reported as 48.57 kPa,60.7 kPa and 47.48 kPa,respectively.The results of the triaxial compression test revealed that with the addition of BS fibers,the internal friction angle increased by about 100%,and with the addition of PET fibers,the cohesion increased by about 70%.Moreover,scanning electron microscope(SEM) analysis was employed to confirm the findings.The relationship between CBR and ITS values,obtained via statistical analysis and used for the optimum design of road pavement layers,demonstrated that these parameters had high correlation coefficients.The outcomes of multiple linear regression and sensitivity analysis also confirmed that the fiber content had a greater effect on CBR and ITS values than fiber length. 相似文献
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