Bio-based self-modulating thermal and moisture buffer mortars for architectural applications

New construction materials for architectural applications need to face environmental impact and energy efficiency issues. Self-modulating materials are promising solutions to optimize the energy performance of buildings, by compensating climatic hygro-thermal changes. Phase-change materials (PCM) an...

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Bibliographic Details
Published in:Procedia Structural Integrity 2024, Vol.64, p.1435-1443
Main Authors: Palomar, Irene, Barluenga, Gonzalo, Puentes, Javier, Varela, Hugo
Format: Article
Language:English
Subjects:
Bio-based components
moisture
phase-change material
self-modulating mortar
super absorbent polymer
thermal buffer
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Summary:New construction materials for architectural applications need to face environmental impact and energy efficiency issues. Self-modulating materials are promising solutions to optimize the energy performance of buildings, by compensating climatic hygro-thermal changes. Phase-change materials (PCM) and Superabsorbent polymers (SAP) highlight among bio-based components that can be used to design self-modulating mortars. On one hand, PCM can storage and release thermal energy, modulating heat flow and reducing heating and cooling energy demand. On the other, SAP can help to achieve suitable indoor conditions as they level air humidity and contribute to an evaporative cooling effect. In addition, these polymeric materials can be made from renewable bio-resources, becoming bio-based materials. This paper presents a study reporting materials selection, mortar composition design and experimental tests and procedures used to assess thermal and moisture self-modulating properties of PCM and SAP modified mortars for architectural applications as buffer layers. A pervious cement-lime mixture was designed and different amounts and combinations of two types of SAP (spherical and irregular particle shape) and a microencapsulated PCM were evaluated. Mortars’ fresh workability and setting and hardened physical and mechanical properties, microstructure, thermal (heat conductivity and storage properties) and hygric parameters (water and vapor transport and storage) and long term carbonation were studied. The preliminary results of self-modulating mortars showed that SAP and PCM can increase moisture and thermal properties, enhancing buffer capacities of architectural mortar renderings.
ISSN:2452-3216
2452-3216
DOI:10.1016/j.prostr.2024.09.388