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Effect of Preparation Temperature on the Aging Properties of Waste Polyethylene Modified Asphalt

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Journal of Materials Science & Technology 2015年第3期31卷 320-324页

作者： Changqing Fang Mengya Zhang ruien yu Xiaolong Liu School of Printing and Packing Engineering Xi'an University of Technology

In this study, waste polyethylene(WPE) was used as a modifier for base asphalt. In our previous studies,we have examined a variety of polymer modifiers for asphalt. By contrast, little research has focused on the preparation process, such as preparation time, preparation temperature and shear rate. The effect of preparation temperature on aging properties of WPE-modified asphalt was investigated in this work. The experimental materials were characterized by infrared spectroscopy(IR), thermo-gravimetric analysis(TG), and differential scanning calorimetry(DSC). The physical properties were determined by conducting asphalt penetration, softening point and ductility tests. The results show that increasing the preparation temperature results in an increased softening point of WPE-modified asphalt while decreased penetration and ductility. In addition, this variation was accentuated by aging the experimental materials. The modification process of WPE is a physical process. During the asphalt modification process, the WPE aged as the preparation temperature increased. The results revealed that 190 C is the most suitable preparation temperature, and the post aged asphalt demonstrated improved high temperature stability.

关键词： Waste plastics Characterization Temperature

Preparation and Properties of Asphalt Modified with a Composite Composed of Waste Package Poly(vinyl chloride) and Organic Montmorillonite

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Journal of Materials Science & Technology 2014年第12期30卷 1304-1310页

作者： Changqing Fang Xiaolong Liu ruien yu Pei Liu Wanqing Lei College of Printing and Packing Engineering Xi'an University of Technology

A composite composed of waste package poly（vinyl chloride）（WPVC） and organic montmorillonite（OMMT） was prepared by coextrusion, which is used for modifying asphalt. The micromorphology of the WPVC/OMMT composite and its effect on the macroscopic properties of asphalt were studied using a fluorescent microscope and an X-ray diffractometer（XRD）. The introduction of OMMT allows the WPVC to be good dispersed in the asphalt matrix, as demonstrated by differential scanning calorimetry（DSC） and Fourier transform infrared spectroscopy（FTIR） analysis. The results indicate that asphalt modified by WPVC/OMMT composites with low OMMT content results in better high-temperature storage stability and physical properties of modified asphalt.

关键词： Composite Waste plastics Characteristics Thermal properties

Preparation,Characterization and Hot Storage Stability of Asphalt Modified by Waste Polyethylene Packaging

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Journal of Materials Science & Technology 2013年第5期29卷 434-438页

作者： Changqing Fang Ying Zhang Qian yu Xing Zhou Dagang Guo ruien yu Min Zhang School of Printing and Packaging Engineering Xi'an University of Technology School of Materials Science and Engineering Northwestern Polytechnical University School of Materials Science and Engineering Xi'an Jiaotong University

Waste polyethylene packaging （WPE） was used to modify asphalt, and hot storage stability of the modified asphalt was studied in this paper. The morphological change and component loss of WPE modified asphalt were characterized by fluorescence microscopy, Fourier transform infrared spectroscopy （FT-IR）, differential scanning calorimetry （DSC）, thermogravimetry （TG） and isolation testing. In addition, the mechanism of the hot storage stability of WPE modified asphalt was discussed. The results showed that the modification of asphalt with WPE was a physical process. It was found that the filament or partly network-like structure formed in the modified asphalt system was beneficial to improving the hot storage stability. Moreover, the addition of WPE resulted in a decrease in both the light components volatilization and the macromolecules decomposition of asphalt. It was demonstrated that when the content of WPE in matrix asphalt was less than 10 wt%, the service performances of modified asphalt could be better.

关键词： Asphalt Waste polyethylene packaging Hot storage stability Mechanism

Viscoelasticity of Asphalt Modified With Packaging Waste Expended Polystyrene

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Journal of Materials Science & Technology 2014年第9期30卷 939-943页

作者： Changqing Fang Linna Jiao Jingbo Hu Qian yu Dagang Guo Xing Zhou ruien yu School of Printing and Packaging Engineering Xi'an University of Technology School of Material Science and Engineering Xi'an Jiaotong University

In view of environmental and economic aspect, asphalt was modified with recycled packaging waste expended polystyrene （WEPS） instead of common polymer. The differential scanning calorimetry （DSC）, rotational viscometer and dynamic shear rheology （DSR） were used to analyze and evaluate the viscoelasticity of modified asphalt. Results indicate that the sensitivity of modified asphalt to temperature is decreased while the rut resistance of asphalt is increased. In addition, the viscoelasticity of asphalt is improved after the modification with WEPS. Besides, the modified asphalt has high viscosity at low temperature and low viscosity at high temperature, which is favorable for construction.

关键词： Waste plastics Characterization Viscosity

Effect of Components on the Performance of Asphalt Modified by Waste Packaging Polyethylene

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Journal of Wuhan University of Technology(Materials Science) 2016年第4期31卷 931-936页

作者：张茂荣 FANG Changqing ZHOU Shisheng CHENG Youliang yu ruien LIU Shaolong LIU Xiaolong SU Jian School of Mechanical and Precision Instrument Engineering Xi’an University of Technology Xi’an 710048 China Faculty of Printing Packaging Engineering and Digital Media Technology Xi 'an University of Technology Xi 'an 710048 China

Waste packaging polyethylene（WPE） was used to modify raw asphalt by melt blending the components at 190 ℃ for 1 h in a simple mixer and subsequently machining them at 120 ℃ for 1 h in a highspeed shearing *** effect of modification on the degree of the penetration,the softening point and the ductility of the asphalt was studied using fluorescent microscopy,infrared spectrometry,component changes and various other *** experimental results showed that no chemical reactions took place in the components themselves（saturate,aromatic,asphaltene and resin） during the *** softening point and penetration of the asphalt were found to be closely related to the resulting contents of the asphaltene,saturate and resin *** addition,aromatics were identified as having the greatest impact on the ductility of the asphalt.

关键词： asphalt penetration ductility resin softening aromatic packaging polyethylene blending mixtures

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表面窄缺陷深度的光声检测方法

光学学报 2022年第2期42卷 113-124页

作者：李海洋智斌亮潘强华安志武于瑞恩中北大学先进制造技术山西省重点实验室山西太原030051 中国特种设备检测研究院北京100029 中国科学院声学研究所北京100190

为实现对表面缺陷深度的激光超声定量检测,建立了与缺陷宽度有关的深度测量理论。建立了含有宽度修正项的深度测量公式,并定义了缺陷尺寸比值概念,划分了窄缺陷、极窄缺陷与宽缺陷三种缺陷类型,以及在这三种不同类型下缺陷深度测量方法... 详细信息

为实现对表面缺陷深度的激光超声定量检测,建立了与缺陷宽度有关的深度测量理论。建立了含有宽度修正项的深度测量公式,并定义了缺陷尺寸比值概念,划分了窄缺陷、极窄缺陷与宽缺陷三种缺陷类型,以及在这三种不同类型下缺陷深度测量方法的适用性,并采用有限元仿真加以验证;搭建了激光超声检测实验平台,对铝合金表面缺陷样品进行了深度检测。结果表明:引入宽度修正项可实现对窄缺陷深度的定量检测,该方法的平均测量误差不足5%,很好地实现了缺陷深度的精确测量。

关键词：测量激光超声表面微缺陷尖端波形转换定量测量

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废纸脱墨技术新进展

中国印刷与包装研究 2010年第S1期2卷 314-314页

作者：方长青胡京博张颖于瑞恩张敏西安理工大学印刷包装工程学院西安710048

废纸的回收利用,就是将废纸进行再生处理,除去废纸原料中含有的油墨和其他杂质,回收纸浆纤维。废纸中含有的油墨是主要的杂质,特别是油墨的残存量,它左右着脱墨纸浆的质量,并决定着纸浆的用途。不言而喻,要扩大脱墨纸浆的使用范围,必须... 详细信息

废纸的回收利用,就是将废纸进行再生处理,除去废纸原料中含有的油墨和其他杂质,回收纸浆纤维。废纸中含有的油墨是主要的杂质,特别是油墨的残存量,它左右着脱墨纸浆的质量,并决定着纸浆的用途。不言而喻,要扩大脱墨纸浆的使用范围,必须尽可能多地除去油墨,减少油墨的残存量。

关键词：废纸脱墨回收利用

地方感的多态与分异:不同人群对旧城街区的感知

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人文地理 2023年第1期38卷 36-43页

作者：黄旭于萍杨振山谭骆坚汤睿恩马璟怡南京师范大学地理科学学院南京210023 中国科学院地理科学与资源研究所、中科院区域可持续发展分析与模拟实验室北京100101

地方感指人与地方的情感关联,是地理学特别是人文主义地理学的关键概念。快速城镇化使得“地方”剧变,地方感也变得复杂多样,多元主体的地方感形成机制值得探讨。本文基于人文主义地理学视角,选取江苏省如皋市东大街为典型案例,通过实... 详细信息

地方感指人与地方的情感关联,是地理学特别是人文主义地理学的关键概念。快速城镇化使得“地方”剧变,地方感也变得复杂多样,多元主体的地方感形成机制值得探讨。本文基于人文主义地理学视角,选取江苏省如皋市东大街为典型案例,通过实地调研,运用半结构化访谈等方法,将不同主体的地方感归纳为三类:根植型、创造型和关怀型。老年原住民形成了根植型地方感,其重点在血缘联结、归属感、身份认同;沿街商户生成了创造型地方感,主要涉及美学、经验与私人空间等;虽从地方抽离但仍与地方保持着积极情感纽带的“乡邻”们则形成了关怀型地方感,主要涉及关注、社会互动、熟悉等。借助案例剖析和质性研究方法,本文对地方感多元类型和形成机制的深入探讨将有助于理解地方感的多态性和分异性。

关键词：旧城街区地方感地方依赖地方依恋地方认同

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苏格拉底式问答法在医院教学中的应用

中国中医药现代远程教育 2023年第3期21卷 1-4页

作者：陈曦李瑞恩王艳艳于晶高蕾长春中医药大学附属医院内分泌代谢病科吉林长春130021 长春中医药大学基础医学院吉林长春130117

目前基于“基础课”“专业课”“临床实习”阶段式的教学模式培养出的医学生临床意识淡薄,不能学以致用,因此临床教师在医院教学中面临着极大的挑战。苏格拉底式问答法强调学生的主观能动性,能够帮助学生形成知识构架,强化学习效果,又... 详细信息

目前基于“基础课”“专业课”“临床实习”阶段式的教学模式培养出的医学生临床意识淡薄,不能学以致用,因此临床教师在医院教学中面临着极大的挑战。苏格拉底式问答法强调学生的主观能动性,能够帮助学生形成知识构架,强化学习效果,又能培养学生的逻辑思维、批判性思维,十分适合医院教学。

关键词：苏格拉底式问答法医学临床带教教学改革