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卜春锋 《合成材料老化与应用》2023,(2):75-77
为探讨硅藻土用量对于橡胶沥青混合料路用性能的影响,基于车辙试验、低温弯曲试验和冻融劈裂强度试验等一系列室内试验,以18%橡胶沥青为对照组,研究了不同用量(8%、10%、12%、14%、16%)硅藻土与18%橡胶粉对复合改性沥青混合料高温性能、低温性能及水稳定性的影响规律。试验结果表明:适量的硅藻土不仅可提高复合改性沥青混合料的高温抗车辙和抗永久变形能力,还能增强沥青混合料在低温抗裂性能与抗水损害性能,综合各方面性能变化趋势及经济性,建议硅藻土用量为12%。 相似文献
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刘志强 《合成材料老化与应用》2021,50(1):35-38
通过马歇尔稳定度和布氏粘度试验研究了聚氨酯沥青混合料的养护时间和温度,并在此基础上利用车辙试验、低温弯曲试验、浸水马歇尔试验和冻融劈裂试验评价了沥青混合料的各项路用性能,并与基质沥青和SBS改性沥青作对比.试验结果表明,聚氨酯改性沥青混合料的最佳养护温度120℃,养护时间48h,高温稳定性和低温抗裂性大幅度提高,均优于... 相似文献
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为了研究钢渣沥青混合料(Steel Slag Asphalt Mixture,SSAM)的路用性能,基于室内试验设计了普通AC-13型与钢渣AC-13型沥青混合料,并开展了两种混合料的高温抗车辙、低温拉伸、水稳定性能的实验研究。研究结果表明:在将沥青混合料中粗集料全替换成钢渣的情况下,钢渣沥青混合料的高温抗车辙性与低温拉伸性能均高于普通AC-13,然而其水稳定性稍弱于普通AC-13;在沥青混合料中引入钢渣后会提高沥青用量,这是由于钢渣颗粒表面存在大量的孔结构吸附了更多的沥青。本研究能够为实际工程提供借鉴,具有现实意义。 相似文献
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针对某项目市政道路拟使用PE改性沥青混合料,为了获取PE改性剂的最佳掺量,针对PE改性沥青混合料的配合比进行分析。采用PE改性沥青性能试验的方法,分析改性沥青的主要性能和PE改性沥青混合料的路用性能。结果表明,该混合料高温稳定性强,低温具有一定抗裂性,在市政路面修建中具有一定的使用价值。 相似文献
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为研究醋酸钠融雪剂对于纳米ZnO改性沥青及其混合料性能的影响规律,采用不同质量浓度醋酸钠对应的融冰体积指标评价了融冰化雪能力,从沥青3大指标试验分析了醋酸钠融雪剂对于沥青基本性能的影响,采用车辙试验、低温小梁弯曲试验和浸水马歇尔试验探讨了醋酸钠融雪剂对于纳米ZnO改性沥青混合料路用性能的影响。结果表明,醋酸钠质量浓度在0.2 g/mL时融冰效果最佳,沥青3大指标随融雪剂质量浓度增大而减小,纳米ZnO不仅提高了沥青混合料的高低温性能和水稳定性,而且明显改善了沥青混合料路用性能对于醋酸钠融雪剂的耐侵蚀性。 相似文献
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为研究地聚合物用量对沥青混合料路用性能的影响,通过一系列室内试验分别研究了不同掺量(3%、5%和7%)地聚合物的改性沥青混合料高低温和水稳定性、抗疲劳性能,并以70#基质沥青与SBS改性沥青作为对照组,试验结果表明,地聚合物可大幅度改善沥青混合料的高温抗车辙能力和抗水损害性能,但受其自身材料特性作用,对于沥青混合料的低温抗裂性和抗疲劳特性具有一定不利影响,在实践应用中须严格控制其用量。 相似文献
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为分析多聚磷酸(PPA)对生物沥青性能的影响,选用2种不同的生物油(生物油Ⅰ、生物油Ⅱ),制备生物沥青Ⅰ与生物沥青Ⅱ,通过针入度、软化点和延度试验对生物油含量不同的生物沥青和多聚磷酸掺量不同的改性生物沥青进行性能分析。结果表明,不同来源的生物油对基质沥青性能的影响会产生巨大的差异。多聚磷酸的掺入可以提高生物沥青Ⅰ与生物沥青Ⅱ的针入度与软化点,但会降低生物沥青的延度。选取10%生物沥青Ⅱ+0.9%PPA制备改性生物沥青进行短期老化试验和沥青混合料试验。结果表明,改性生物沥青具有良好的抗短期老化性能、低温抗裂性能和水稳定性能,但高温性能存在一定的不足。 相似文献
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《应用化工》2022,(6):1438-1442
通过熔融共混法制备SBS/PPA复合改性沥青,采用胶体磨将其乳化得到SBS/PPA复合改性乳化沥青,研究多聚磷酸(PPA)对SBS改性乳化沥青稳定性、蒸发残留物路用性能的影响。结果表明,PPA能够改善SBS改性乳化沥青的储存稳定性,当PPA掺量由占SBS用量的1%增加到3%时,和未添加PPA的SBS改性乳化沥青相比,其5 d储存稳定性由6.3%降低到4.9%,降低的幅度超过22%,且随着PPA掺量的增加,SBS改性乳化沥青蒸发残留物的软化点、延度逐渐升高。PPA能够促使SBS在改性沥青中形成空间网状结构,从而提高了SBS对沥青路用性能的改善效果。当SBS掺量为沥青用量的4.5%,PPA的用量为SBS用量的3%时,SBS/PPA改性乳化沥青蒸发残留物的路用性能接近热沥青。 相似文献
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《应用化工》2022,(8):2031-2036
为改善SBS改性沥青的路用性能及相容性,采用高速剪切法,将碳纳米管掺入SBS改性沥青中,制备复合改性沥青。采用三大指标、布氏粘度、离析实验、荧光显微镜等对其性能进行评价。结果表明,碳纳米管可以有效改善SBS改性沥青的高温稳定性、粘滞性,并且随着掺入碳纳米管量的增加,性能效果提升越好,但超过0.9%时改善效果趋于饱和;对改性沥青的温度敏感性和低温性能存在不利影响;碳纳米管的掺入限制了SBS颗粒与沥青分子之间的相对运动,使得SBS在沥青中的分散更均匀,改善了相容性与储存稳定性;综合考量碳纳米管/SBS复合改性沥青的各项性能,当其掺量为0.9%时,改性效果达到最佳。 相似文献
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In this study, polyphosphoric acid (PPA) was used to modify styrene–ethylene/butylene–styrene (SEBS)‐modified asphalt further and decrease the SEBS content in asphalt. Different structural analysis methods including morphology observation, infrared spectroscopy, thermal analysis were used to investigate the structural characteristics of asphalt modified by SEBS or PPA before and after short‐ or long‐term thermal ageing. The study shows the suitable addition of PPA can improve the major physical and rheological properties of SEBS‐modified (SM) asphalt and the improved properties became more obvious with further ageing. 0.8 wt % PPA can replace 2 wt % SEBS in the modification. Morphology observation showed PPA increased the incompatibility between SEBS and asphalt. Thermal analysis showed PPA changed the energy consumption and mass loss of SM asphalt greatly at elevated temperatures and led to the more complex structural characteristics. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46085. 相似文献
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To improve the performance of desulfurized rubber modified asphalt (DRMA), especially its high-temperature performance, three modifiers (including polyphosphoric acid [PPA], styrene-butadiene-styrene [SBS], and rock asphalt) were selected to modify DRMA respectively. The conventional performance, rheological properties, chemical composition, and thermal decomposition were characterized to analyze the performance and modification mechanism of DRMA and its composites. Test results show that, the addition of PPA, SBS, and rock asphalt can all improve the high temperature of DRMA, among which the desulfurized rubber/rock asphalt compound modified asphalt (DRMA-ROCK) has the best high-temperature performance; however, its construction workability, storage stability, and low-temperature performance are poor. In contrast, desulfurized rubber/PPA compound modified asphalt (DRMA-PPA) not only has better high-temperature performance, but also has excellent low-temperature performance, storage stability, and fatigue performance. Fourier infrared spectroscopy (FTIR) test confirms that the modification process of DRMA by these modifiers is chemical modification, and the characteristic peak indexes obtained from FTIR also prove that DRMA-ROCK has better high-temperature performance but poor construction workability from the microscopic point of view. Furthermore, thermogravimetric analysis-differential scanning calorimetry test shows that the addition of rock asphalt improves the thermal stability of DRMA, while PPA and SBS decrease its thermal stability. From the above results, it can be concluded that DRMA-PPA has excellent comprehensive properties. 相似文献
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The performance and modification mechanism of Buton rock asphalt (BRA) modified asphalt were analyzed. The road performance of modified asphalt was observed and compared with SBS modified asphalt to confirm the modification mechanism. Four-component test, and dynamic shear rheological tests were conducted to identify the performance of modified asphalt. Fourier transform infrared spectroscopy was carried out to analyze the modification mechanism of modified asphalt. Finally, the rutting, low-temperature bending beam failure, and freeze–thaw splitting tests were used to evaluate the high-temperature performance, low-temperature cracking resistance, and water stability performance of mixtures, respectively. The results show that the high-temperature performance of asphalt can be improved by BRA with asphaltene and resin increased. It is likely that there is no new functional group generated and this process was physical changes mainly. The honeycomb structure of BRA ashes/particles increased the contact area between the base asphalt and BRA ashes/particles, which makes the asphalt change from the homogeneous body into a two-phase continuous structure system. Consequently, the adhesion between asphalt and BRA ashes/particles was enhanced, and the dynamic stability, bending coefficient and splitting strength ratio were improved. It indicates that the test results of asphalt mixtures verified the modification effect of BRA. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 46903. 相似文献