Behavior of cementitious mortars with direct incorporation of non-encapsulated phase change material after severe temperature exposure. (10th January 2020)

• Record Type: Journal Article
• Authors: Cunha, Sandra; Silva, Marisa; Aguiar, José
• Is Part Of: Construction & building materials. Volume 230(2020)
• Publication Date: 2020-01-10
• Subjects: Cementitious materials -- Phase Change Materials (PCM) -- Direct incorporation -- Physical properties -- Mechanical properties -- Severe temperature behavior; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2019.117011
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Four cementitious materials with direct incorporation of PCM were developed. The PCM used is non-encapsulated paraffin. The influence PCM presence at severe temperature exposure was evaluated. The PCM incorporation leads to an improvement of the freeze-thaw behavior. The behavior at high temperatures is similar to the reference and PCM mortars. Abstract: Nowadays, the study of construction solutions capable of withstanding severe conditions, such as temperature exposure, is paramount. Considering the thermal storage capabilities of phase change materials (PCM), this work features the study of four different compositions based on cement and fly ash, with which different contents of non-encapsulated PCM (0%, 5%, 10% and 20%) were combined by direct incorporation. These were tested under low and high temperatures (−18 °C, 20 °C, 200 °C, 400 °C and 600 °C), through freeze-thaw as well as compressive and flexural tests. Results show that the incorporation of non-encapsulated PCM leads to an improvement regarding freeze-thaw conditions, while maintaining an identical behavior to the reference mortars when subjected to high temperatures.