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基于GPC和FTIR的再生混合料新旧沥青融合程度研究 被引量:9
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作者 张德鹏(编译) 徐金枝(编译) +4 位作者 郝培文(编译) benjamin f.bowers baoshan huang xiang shu brad c.miller 《中外公路》 北大核心 2016年第6期214-219,共6页
伴随着沥青路面回收料(RAP)在沥青路面修筑和维护中的逐步推广应用,有关RAP对再生路面结构及其力学性能的影响已有了大量的研究,但对RAP旧沥青和新沥青的融合问题还尚不清楚。工程应用中通常假定RAP旧沥青与新沥青发生了完全融合。但如... 伴随着沥青路面回收料(RAP)在沥青路面修筑和维护中的逐步推广应用,有关RAP对再生路面结构及其力学性能的影响已有了大量的研究,但对RAP旧沥青和新沥青的融合问题还尚不清楚。工程应用中通常假定RAP旧沥青与新沥青发生了完全融合。但如果两者没有完全融合,路面的使用寿命将小于预期水平。该文中,假定再生沥青混合料中集料表面各沥青层可独立完全地分离出来,在此前提下,研究中对再生沥青混合料进行了分层萃取,并利用凝胶渗透色谱(GPC)和傅立叶转换红外光谱(FTIR)对分层萃取出的各层沥青进行定量检测,经对比分析后确定RAP旧沥青和新沥青的融合程度。研究结果表明:再生沥青混合料中RAP表面各层旧沥青与新沥青均发生了一定程度的融合。 展开更多
关键词 沥青 分层萃取 融合程度 GPC FTIR RAP
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Improvement of saponification extraction method for fatty acids separation from geological samples
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作者 Jiang Chang Yanqing Xia +2 位作者 Suping Ma Xuan Fang Minzhuo Sun 《Acta Geochimica》 EI CAS CSCD 2016年第2期148-155,共8页
The conventional saponification method could result in lower recoveries and artificial changes of longchain fatty acids. The main reason is the error judgment of the intermediate layer suspended between the aqueous an... The conventional saponification method could result in lower recoveries and artificial changes of longchain fatty acids. The main reason is the error judgment of the intermediate layer suspended between the aqueous and organic layer during the liquid–liquid extraction process.This study shows that the intermediate layer consists of lots of medium- to long-chain carboxylic salts for their special physical and chemical properties. An improved saponification extraction method is also developed and the results show that the carboxylic salts distributed in the intermediate layer could be obtained completely, which greatly enhances the authenticity and accuracy of fatty acid analysis. Additionally, the possible reasons of formation of the intermediate layer are also discussed. 展开更多
关键词 Fatty acid SEPARATION Saponificationextraction Carboxylic salt Geological sample
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