In order to study the effects of composite fiber on the performance of cold-mixed mixture of epoxy and SMA-10 asphalt,basalt fiber(BF)and polyester fiber(PF)codoping were carried out to analyze the effects of various composite fiber ratios on the high temperature performance,low temperature crack resistance,water stability,fatigue resistance,and aging resistance.A two-dimensional numerical model of asphalt mixture was constructed by digital image processing and discrete element simulation technol-ogy.The skeleton characteristic parameters of discrete element model were extracted to determine the optimal fiber blending length.The fiber contents were 0.3%PF,0.2%PF+0.1%BF,0.2%BF+0.1%PF,and 0.3%BF.The results show that the road per-formance,anti-fatigue performance and anti-aging performance of 0.3%basalt fiber are better than that of 0.3%polyester fiber.Among them,0.2%BF+0.1%PF has the best performance improvement.Compared with single-doped polyester fiber and basalt fiber,the dynamic stability of 0.2%BF+0.1%PF increases from 37 058 times·mm-1 and 42 000 times·mm-1 to 45 000 times·mm-1,an increase of 21.4%and 7.1%.The flexural tensile strength increases from 29.01 MPa and 30.53 MPa to 32.08 MPa,an increase of 10.6%and 5.1%.The fatigue life under 650 με strain condition increases from 1.63 million times and 1.83 million times to 1.97 million times,indicating a increase by 20.9%and 7.7%,respectively.The codoping of mixed fiber in the cold mix epoxy SMA-10 asphalt mixture can improve its road performance,and the mixed effect of basalt fiber and polyester fiber is better than that of single fiber.
随着经济全球化的不断深入,国际交流日益频繁,英语这一广泛通用语言的重要性不断凸显.作为国民经济的支柱产业之一,我国化学工业产业门类齐全,但有些技术与先进国家仍有一定差距,需要大量学习、吸收国际化工先进知识与成果,掌握化工英语听说读写能力成为化工专业科研及技术人员必备的技能之一.但是,化学化工领域的专业英语涉及到大量的数学模型、专用词汇及化学术语等,使得化学英语文献资料的阅读难度比通识英语文献大的多.如何提升化工英语阅读教学的质量,帮助化工类大学生更好地培养化工英语阅读能力,是摆在化工类院校及高校化工类院系面前必须解决的重要问题.
随着我国改革开放及一带一路倡议的进一步深化,我国与世界各国的交流也日益频繁,涉及到政治、经济、文化的各个方面、不同领域,这对人才提出了既要懂专业知识又要懂国际交流语言.化工领域也不例外,掌握化工类专业英语是化工人才提高社会竞争力,化工前沿研究成果不可或缺的必备技能.
以3,5-二羟基苯甲酸为CB2单体,1,3-双(氯甲基)-1,1,3,3-四甲基二硅氧烷为A2单体,通过A2+CB2法合成了一种超支化聚硅氧烷(HBPS),利用红外光谱、核磁氢谱和凝胶渗透色谱对其化学结构和分子质量进行了表征.将HBPS作为改性剂添加到双酚A二缩水甘油醚(DGEBA)/甲基六氢苯酐(MeHHPA)体系,对该体系固化物的力学性能、热稳定性和热机械性能进行了研究.结果表明HBPS的添加会略微降低环氧固化物的热分解温度、模量和Tg,但能够大幅提升固化物的韧性.与纯环氧固化物相比,含有质量分数16％HBPS的环氧固化物的冲击强度提升了 90％,断裂韧性提升了 66％.此外,HBPS还能提高环氧固化物的阻燃性能.
长期以来,针对化工物流的研究存在非系统性缺陷,即将其视为化工供应链的一系列环节(如运输环节、存储环节、应急环节等)的总称,如此一来既掩盖了物流的服务属性,也难以清晰辨别物流过程特点,如"一般化学品运输"与"危险化学品运输"统一被纳入到化工物流体系内,但在实际操作状态下具有显著区别.
