Classification of mortars with incorporation of phase change materials based on their physical, mechanical and thermal properties

ABSTRACT Currently, there are several mortars available for application in the construction industry. These mortars can be based on different binders, have different physical and mechanical properties and even other specific properties. However, the correct selection of a mortar becomes increasingly difficult. Thus, comes up the need to classify different mortars based on a specific criteria and a single procedure. In this way, it will be possible to identify the most appropriate mortars according to their function. In this research, a materials ranking procedure developed by Czarnecki and Lukowski is applied, based on an usability function. The ranking procedure transforms experimental results of properties into one numerical value. The products can be classified according to their individual properties or even an optimized combination of different properties. Thus, the main purpose of this study was the ranking of mortars based in different binders with incorporation of phase change materials. Hydraulic lime, gypsum and cement were the binders studied. For each binder, three different mortars were developed, reference mortars (0% PCM), mortars with incorporation of 40% of PCM and mortars with incorporation of 40% of PCM and 1% of fibers. Based on the results it was possible to conclude that the incorporation of PCM in mortars changes their global performance.

摘要
当前，建筑行业可选用的砂浆品类繁多。此类砂浆可采用不同胶凝材料制备，具备各异的物理、力学性能及其他专项性能。然而，砂浆的正确选型正变得愈发困难。因此，亟需基于统一标准与单一流程对各类砂浆进行分类，以便根据其应用功能筛选出最适配的砂浆。
本研究采用由Czarnecki与Lukowski提出的基于使用性能函数的材料排序方法。该方法可将各项性能的试验结果转化为单一综合数值，进而可依据材料的单项性能或不同性能的优化组合对产品进行分类。据此，本研究的核心目标为：对掺入相变材料（phase change materials，PCM）、以不同胶凝材料制备的砂浆开展排序分析。本研究选取的胶凝材料包括水硬性石灰、石膏与水泥。针对每种胶凝材料，共制备3组砂浆试样：基准砂浆（PCM掺量为0%）、掺加40%PCM的砂浆，以及同时掺加40%PCM与1%纤维的砂浆。
基于试验结果可得出结论：在砂浆中掺入PCM会改变其整体综合性能。