Microstructural characterisation of lightweight granules made from masonry rubble

Microstructural characterisation of lightweight granules made from masonry rubble
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砌体碎石制成的轻质颗粒的微观结构特征

DOI:
10.1016/j.micromeso.2014.08.060
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发表时间:
2015
影响因子:
5.2
通讯作者:
A. Zimathies
A. Zimathies
中科院分区:
材料科学2区
文献类型:
--
作者:
K. Rübner;S. Hempel;M. Lindemann;B. Peplinski;N. Vogler;A. Zimathies

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为了更好地了解砌块石轻质粒料的工程性能,对砌块石轻质粒料的孔结构进行了研究。测试了热硬化和水热硬化的颗粒。通过环境扫描电镜、压汞法和吸附法的分析,对它们的微观结构产生了重要的认识。热颗粒的特征在于部分熔融的玻璃质区域和通过窄喉连接的大的内部大孔。它们显示出边缘比表面积沿着疏水行为。相比之下,水热颗粒具有含有板状和墨水瓶状孔的可接近的中孔系统。它们的水等温线的形状取决于颗粒的CaO含量是敏感的硅酸钙水合物相(CSH)的形态。滞后从在低压下闭合的窄环(这可归因于较粗的结晶CSH)变为具有低压滞后的大三角形环(沿着),这是具有墨水瓶和板状孔形态的细纤维状CSH的特征。具有纤维状CSH的颗粒具有更高的比表面积,但具有更多结晶CSH的颗粒表现出更强的物理吸附水分子。
The pore structure of lightweight granules made from masonry rubble was studied in order to better understand their engineering properties. Thermally and hydrothermally hardened granules were tested. Analysis by ESEM, mercury porosimetry and sorption methods yield important insight into their microstructure. The thermal granules are characterised by partly melted vitreous areas and large internal macropores that are connected via narrow throats. They show a marginal specific surface area along with a hydrophobic behaviour. In contrast, the hydrothermal granules have an accessible mesoporous system containing plate-like and ink-bottle pores. The shape of their water isotherms depending on the granules’ CaO content is sensitive to the morphology of calcium silicate hydrate phases (CSH). The hysteresis changes from a narrow loop that closes at low pressures, which can be attributed to coarser more crystalline CSH, to a large triangular-shaped loop along with a low pressure hysteresis, which is characteristic for fine fibre-like CSH with ink-bottle and plate-like pore morphologies. Granules with fibre-like CSH have the higher specific surfaces areas but those with more crystalline CSH show stronger physisorption of water molecules.
描述吸附等温线的模型
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影响因子: 10.5
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