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首页> 外文期刊>Magazine of Concrete Research >Preparation of cenosphere microcapsules and their application in foam concrete
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Preparation of cenosphere microcapsules and their application in foam concrete

机译：泡沫混凝土制备Ceny圈微胶囊及其应用

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摘要

In this study, hydrogen fluoride (HF) was used to generate perforated holes in cenospheres. The cavities of the cenospheres were then filled with coagulants (calcium chloride (CaCl2)) and encapsulated in polyvinyl alcohol to obtain cenosphere microcapsules. The release curve of the cenosphere microcapsules in deionised water was tested using ethylenediaminetetraacetic acid titrimetry, and the corresponding release mechanism was studied. Foam concrete (800 kg/m(3)) was prepared using the physical foaming method with 42.5R ordinary Portland cement, a vegetable protein foaming agent, fly ash, coagulant and the cenosphere microcapsules. Sample characterisation was performed using a rheometer, SEM systems and image-analysis software. The results demonstrated that the calcium chloride release rate of the cenosphere microcapsules was relatively low in the first 16 min, and that the cumulative release rate was 6.9%. The calcium chloride release rate increased after 16 min, the cumulative release rate reaching 58.4% at 32 min, after which the release rate decreased again. This 'controlled-release' phenomenon caused the cenosphere microcapsules to release only a few coagulants during the stirring and pouring stages but to release coagulants quickly during the moulding stage. Consequently, the relative viscosity of the cement slurry in the stirring and moulding stages did not increase, while the setting time of the cement paste shortened, the size stability and uniformity of the air pores in the foam concrete were enhanced, and the physical and mechanical properties of the foam concrete were improved.
机译：在该研究中，氟化氢（HF）用于在吊孔中产生穿孔孔。然后用凝结剂（氯化钙（CaCl 2））填充延伸器的腔体并将聚乙烯醇包封，得到Ceny圈微胶囊。使用乙二胺四乙酸滴定法检测去离子水中的通圈微胶囊的释放曲线，并研究了相应的释放机理。使用42.5R普通波特兰水泥，植物蛋白发泡剂，粉煤灰，凝结剂和长圈微胶囊的物理发泡方法制备泡沫混凝土（800kg / m（3））。使用流变仪，SEM系统和图像分析软件进行样本表征。结果表明，在前16分钟的氯化钙释放速率在前16分钟中相对较低，并且累积释放率为6.9％。 16分钟后氯化钙释放速率增加，累积释放速率在32分钟达到58.4％，之后释放速率再次下降。这种“受控释放”现象导致通心圈微胶囊仅在搅拌和浇注阶段仅释放少量凝结剂，而是在模塑阶段期间快速释放凝结剂。因此，在搅拌和模塑阶段中的水泥浆料的相对粘度不会增加，而水泥膏的设定时间缩短，泡沫混凝土中的空气孔的尺寸稳定性和均匀性得到了增强，以及物理和机械泡沫混凝土的性质得到改善。

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  • 来源
    《Magazine of Concrete Research》 |2020年第20期|1072-1080|共9页
  • 作者

    Liu Zhong-wei; Zhao Kang; Tang Yu-fei; Hu Chi;

  • 作者单位

    Xian Univ Technol Dept Mat Sci & Engn Xian Peoples R China|Sichuan Coll Architectural Technol Deyang Peoples R China;

    Xian Univ Technol Dept Mat Sci & Engn Xian Peoples R China;

    Xian Univ Technol Dept Mat Sci & Engn Xian Peoples R China;

    Sichuan Coll Architectural Technol Deyang Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    admixtures; lightweight; concrete; workability;

    机译：混合物;轻量级;混凝土;可加工性;

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