Differences in the rheological properties of calcitic and dolomitic lime slurries: influence of particle characteristics and practical implications in lime-based mortar manufacturing
Differences in the rheological properties of calcitic and dolomitic lime slurries: influence of particle characteristics and practical implications in lime-based mortar manufacturing
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方解石和白云石石灰浆流变特性的差异：颗粒特性的影响以及石灰基砂浆制造中的实际意义
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
K. Balen
中科院分区：
文献类型：
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作者：
A. Arizzi;R. Hendrickx;G. Cultrone;K. Balen
研究石灰浆体的流变特性是评价石灰砂浆和易性的有效手段。在这项工作中，我们研究了两种工业水合石灰，一个方解石和其他的方解石组成，通过两种类型的流变仪具有不同的几何形状和设置模式的流动行为。考虑到悬浮颗粒的微观结构和表面性质的差异，所得到的结果进行了解释。方解石石灰干颗粒由角形和多分散的簇形成，并且一旦分散在水中，它们表现得像触变材料。另一方面，微晶石灰由纳米颗粒和小的圆形团簇形成，并且在悬浮液中显示出明显的塑性行为。这两种材料之间的根本差异解释了传统上对石灰砂浆用于抹灰和粉刷应用的偏好。
The study of the rheological properties of lime suspensions is a useful means to evaluate the workability of lime mortars. In this work, we studied the flow behaviour of two industrial hydrated limes, one of calcitic and the other of dolomitic composition, by means of two types of rheometer with different geometry and setup mode. The obtained results were interpreted taking into account the differences in microstructure and surface properties of the suspended particles. Calcitic lime dry particles are formed by angular and polydisperse clusters and, once dispersed in water, they behave like thixotropic materials. On the other hand, the dolomitic lime is formed by nanoparticles and small round cluster and it shows a pronounced plastic behaviour in suspension. This fundamental difference between the two materials explains the traditional preference for dolomitic lime mortars for plastering and rendering applications.