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首页> 外文期刊>CERAMICS INTERNATIONAL >Characterisation of the pore-forming process in lightweight aggregate based on silica sludge by means of X-ray micro-tomography (micro-CT) and mercury intrusion porosimetry (MIP)
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Characterisation of the pore-forming process in lightweight aggregate based on silica sludge by means of X-ray micro-tomography (micro-CT) and mercury intrusion porosimetry (MIP)

机译：利用X射线显微断层扫描（micro-CT）和压汞法（MIP）表征基于二氧化硅污泥的轻质骨料中的成孔过程

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In the case of lightweight aggregate (LWA), porosity can be achieved by means of a high temperature foaming process. During this process a glassy matrix is created, and almost simultaneously the added foaming agent degasses and the resulting gasses remain trapped inside the glassy structure. The present paper deals with the foaming process which occurs in the case of silica sludge to which fly ash, which creates liquid phase, has been added, as well as SiC, which acts as a foaming agent. The development of porosity within the structure of this material was investigated at different temperatures and dwelling times by means of X-ray micro-tomography (micro-CT), and mercury intrusion porosimetry (MIP). The results were compared by means of both X-ray micro-tomography and mercury intrusion porosimetry, the first technique being applied within the pore size distribution range of between 50 μm to more than 1 mm, and the second within the range, between 0.0055 and 360 urn. Both techniques have certain limitations as well as certain advantages, but in the case of the investigated system micro-CT gives much more reliable results about porosity development over a prolonged firing time, at the selected temperature. The results showed that, at the selected temperature, which in this case amounted to 1220℃, porosity as well as median pore size increased with increased dwelling times. In the case of prolonged dwelling times, the number of pores decreased, but, on the other hand, the volume of these pores increased.
机译：在轻骨料（LWA）的情况下，可通过高温发泡工艺实现孔隙率。在此过程中，会生成玻璃状基质，几乎同时，添加的发泡剂会脱气，并且所产生的气体仍会滞留在玻璃状结构内部。本文涉及发泡过程，这种过程是在添加了产生液相的粉煤灰以及用作发泡剂的SiC污泥的情况下发生的。通过X射线显微断层扫描（micro-CT）和压汞法（MIP）研究了在不同温度和停留时间下该材料结构内孔隙的发展。通过X射线显微断层照相术和压汞法对结果进行了比较，第一种技术是在孔径分布范围在50μm至1 mm以上的范围内应用，第二种是在孔径范围在0.0055至250 mm之间。 360 n。两种技术都有一定的局限性和优势，但是在所研究的系统中，微型CT在选定的温度下，在延长的烧成时间内，给出了有关孔隙率发展的更为可靠的结果。结果表明，在选定的温度下（此情况下为1220℃），孔隙率和中值孔径随停留时间的增加而增加。在延长的停留时间的情况下，孔的数量减少，但是另一方面，这些孔的体积增加。

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