共查询到19条相似文献,搜索用时 94 毫秒
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再生沥青有一般道路沥青所不具备的特殊性,对再生后沥青抗老化性能的考察却并无统一认可的方法。本文采用老化指数法和软化点速率升高常数法,分别考察了沈阳-铁岭(沈铁)和沈阳-本溪(沈本)公路段再生沥青及其原沥青辽河AH-90的抗老化性能。实验结果证明了这两种方法的可靠性。 相似文献
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松香裂解油的化学组成与性能分析 总被引:4,自引:2,他引:2
以活性白土为催化剂对松香进行催化裂解正交试验,并对裂解产物的化学组成及理化性能指标进行分析测试。结果表明:活性白土可以在较低的反应温度和较短的反应时间内对松香起到催化裂解作用,最佳工艺条件为:反应温度240℃,反应时间1.5 h,催化剂用量为松香质量的10%。裂解油酸值稳定在0.69~0.75 mg/g,得率稳定在60%~63%。气相色谱-质谱(GC-MS)分析表明,得到的非挥发性裂解油主要由苯、萘、酮、酯和菲等化合物组成,松香裂解油酸度为0.075 g/L,运动黏度(20℃)为47.6 mm2/s,冷凝点为-30℃,冷滤点为11℃,十六烷值为30.4。松香裂解油经过复配和性能改良,可达到石化柴油国家标准。 相似文献
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为了研究硅藻土物理和化学特性对沥青及沥青混合料路用性能的影响,对四种产地的硅藻土材料的SiO2含量、硅藻含量、平均粒径、比表面积及堆密度进行了测试,对四种硅藻土改性沥青及硅藻土改性沥青混合料的路用性能进行了测试,并基于灰色关联性分析了硅藻土材料特性对沥青及沥青混合料性能的影响.结果表明,不同硅藻土的物理特性和化学成分差异较大,当硅藻含量及SiO2含量越高、堆密度较小、比表面积较大时,硅藻土改性沥青混合料具有较为优异的水稳定性、高温稳定性和低温抗裂性能;硅藻土改性沥青的抗剪强度与沥青的高温性能及沥青混合料动稳定度的相关性较好,可用于沥青及沥青混合料的高温性能的评价;为了使硅藻土改性沥青混合料具有优异的路用性能应使用SiO2含量和硅藻含量均大于80%的硅藻土. 相似文献
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再生沥青的热老化研究(Ⅱ)——再生沥青热老化过程中族组成变化的研究 总被引:2,自引:1,他引:2
通过对不同老化温度与不同老化时间下薄膜烘箱老化后族组成变化的研究 ,发现再生沥青的族组成随老化的进程发生改变 :老化时间延长 ,饱和分质量分数不变或略有减少 ,芳香分质量分数总是降低 ,胶质质量分数变化复杂 ,沥青质质量分数总是升高。对变化规律与原因进行了详细的讨论 相似文献
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根据灰色关联度安全评价法的基本原理,以四种防晒产品为实例,运用灰色系统理论的相关知识,对待评产品的各个参评参数进行计算,得出相应的灰色关联度,进行对比评价,参照国内外相关行业标准,结合当前市场实际状况,对评价结果进行分析和校正。根据该评价方法所得出的结论,可以对四种参评产品进行对比权衡,根据自己的需要选择最适合自己的产品。通过该评价方法我们可以得出,灰色关联度安全评价法在指导消费者进行产品选择时具有一定的适用性。 相似文献
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Xiang Liu Xiaolong Zou Xiaolong Yang Zhengwei Zhang 《Journal of Adhesion Science and Technology》2018,32(14):1503-1516
Styrene-butadiene-styrene (SBS) modified asphalt used in road engineering is a complicated mixture of various compositions. The present study was undertaken to evaluate the influence of different raw materials and their content on the moisture stability of SBS copolymer modified asphalt mixture. A total of 18 different combinations of base asphalt, SBS, furfural extract oil (FEO), and stabilizer were considered to prepare different SBS modified asphalt samples, and the contact angle test was carried out to determine the work of adhesion and the work of debonding of SBS modified asphalt with aggregate. Moreover, a multi-factor Analysis of Variance (ANOVA) was conducted to investigate the statistical effects of the material composition factors. The results show that the bond strength between SBS modified asphalt and aggregate is significantly affected by the source of base asphalt, but it is insensitive to the change of SBS type under dry and wet conditions. Besides, the moisture damage resistance of SBS modified asphalt improves firstly and then reduces with the rising storage of SBS, FEO, and stabilizer. Furthermore, linear regression analysis suggests that the work of adhesion under dry condition has excellent correlation with the work of debonding under wet condition. 相似文献
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The aim of this work is to identify the volatile organic compounds (VOC) from asphalt by developing a process at atmospheric pressure under air flow in order to qualify and quantify the asphalt emissions by a standard analytical protocol with gas chromatography coupled to mass spectrometry. VOC formation depends on various parameters such as the asphalt temperature, the asphalt oxidation, and the humidity of air. This research contributes to improve knowledge of asphalt emissions. A decrease in VOC is mainly correlated with the asphalt temperature. 相似文献
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基于关联度及Kriging模型的注塑成型稳健优化设计研究 总被引:1,自引:0,他引:1
黄风立;王艳敏;许锦泓;顾金梅;娄勇坚 《中国塑料》2009,23(5):70-75
注塑成型过程的参数设计是一影响因素多、非线性强的优化问题。因此,对该类问题的研究较多,但在已有的研究中,很少考虑随机因素波动对成型质量的影响。针对该问题,选取最大翘曲变形量为成型质量指标,提出了基于关联度及Kriging模型的注塑成型过程的稳健优化方法,该方法在满足成型质量要求的前提下,能自动调整sigma的水平进行稳健优化。优化设计的结果表明该方法提高了最大翘曲量的Sigma水平;通过数值模拟及实际注塑试验,表明该方法有效地提高了塑件的尺寸公差。 相似文献
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Chemical cellulose (dissolving pulp) was prepared from ascidian tunic by modified paper‐pulp process (prehydrolysis with acidic aqueous solution of H2SO4, digestion with alkali aqueous solution of NaOH/Na2S, bleaching with aqueous NaOCl solution, and washing with acetone/water). The α‐ cellulose content and the degree of polymerization (DPw) of the chemical cellulose was about 98 wt % and 918, respectively. The Japanese Industrial Standard (JIS) whiteness of the chemical cellulose was about 98%. From the X‐ray diffraction patterns and 13C‐NMR spectrum, it was found that the chemical cellulose obtained here has cellulose Iβ crystal structure. A new regenerated cellulose fiber was prepared from the chemical cellulose by dry–wet spinning using N‐methylmorpholine‐ N‐oxide (NMMO)/water (87/13 wt %) as solvent. The new regenerated cellulose fiber prepared in this study has a higher ratio of wet‐to‐dry strength (<0.97) than commercially regenerated cellulose fibers. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 1634–1643, 2002. 相似文献