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Stability and instability of foamed concrete

机译:泡沫混凝土的稳定性和不稳定性

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摘要

Foamed concrete has proven to be an effective alternative to granular fills and is now widely used internationally. With increasing demand for lightweight materials for buildings in order to improve sustainability, foamed concrete has also developed as an ideal material for this purpose, and many countries utilise construction with precast foamed concrete blocks. However, at densities lower than current technology allows, typically < 500kg/m(3), foamed concretes are more prone to instability of the fresh mix. Furthermore at very low densities, <= 300 kg/m(3), instability is almost inevitable, greatly limiting the potential of foamed concrete for applications where mass is critical (e.g. weak soils, backfilling damaged structure etc.). This paper aims to illustrate the mechanisms of stability and instability in foamed concretes and demonstrates how ultra-low density mixes (down to plastic density of 150 kg/m(3)) can be successfully produced.
机译:泡沫混凝土已被证明是粒状填料的有效替代品,目前已在国际上广泛使用。随着对建筑用轻质材料的需求不断增长以改善可持续性,泡沫混凝土也已发展成为用于此目的的理想材料,许多国家都在使用预制泡沫混凝土砌块进行建筑。但是,在密度低于当前技术允许的密度(通常<500kg / m(3))的情况下,泡沫混凝土更容易产生新拌混合物的不稳定性。此外,在非常低的密度(<= 300 kg / m(3))下,几乎不可避免地会出现不稳定性,这极大地限制了泡沫混凝土在质量至关重要的应用中(例如土壤薄弱,回填损坏的结构等)的潜力。本文旨在说明泡沫混凝土的稳定性和不稳定性机理,并说明如何成功地生产超低密度混合料(低至150 kg / m(3)的塑料密度)。

著录项

  • 来源
    《Magazine of Concrete Research》 |2016年第12期|542-549|共8页
  • 作者单位

    Univ Dundee, Div Civil Engn, Concrete Technol Unit, Dundee, Scotland;

    Univ Dundee, Div Civil Engn, Concrete Technol Unit, Dundee, Scotland;

    Univ Dundee, Div Civil Engn, Concrete Technol Unit, Dundee, Scotland;

  • 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
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