Print Email Facebook Twitter Fundamental investigation on the frost resistance of mortar with microencapsulated phase change materials Title Fundamental investigation on the frost resistance of mortar with microencapsulated phase change materials Author Romero Rodriguez, C. (TU Delft Materials and Environment) França de Mendonça Filho, F. (TU Delft Materials and Environment) Chaves Figueiredo, S. (TU Delft Materials and Environment) Schlangen, E. (TU Delft Materials and Environment) Šavija, B. (TU Delft Materials and Environment) Date 2020 Abstract Recent studies have shown that concrete containing Phase Change Materials (PCM) with low transition temperatures may reduce the number of freeze/thaw cycles suffered by the cementitious composite in temperate climates. Nevertheless, the positive influence of such admixtures on the frost resistance of cement-based materials has not been directly shown, nor the negative. In this study, mortars with different contents of microencapsulated PCM by volume of cement paste were studied with regard to the progression of their internal and salt scaling damages during freeze/thaw cycles. X-ray micro tomography was used to monitor damage development and spatial distribution in the mortars. Furthermore, the pore system and microstructure of the PCM-modified mortars were characterized to unveil the causes of the observed macroscopic behavior during frost weathering. The results show that limited amounts of PCM in mortar, namely 10% by volume of cement paste, results beneficial for the frost and scaling resistance of the composite. Whereas, for larger PCM additions, like 30% by volume of paste, the changes in microstructure, porosity and mechanical strength brought in by these admixtures resulted in worsened performance against freeze/thawing cycles. Subject Freeze/thaw cyclesMicrostructureMortarPhase Change materialsX-ray microtomography To reference this document use: http://resolver.tudelft.nl/uuid:dc620f66-3860-457e-be8d-ae87bd0d886e DOI https://doi.org/10.1016/j.cemconcomp.2020.103705 ISSN 0958-9465 Source Cement and Concrete Composites, 113 Part of collection Institutional Repository Document type journal article Rights © 2020 C. Romero Rodriguez, F. França de Mendonça Filho, S. Chaves Figueiredo, E. Schlangen, B. Šavija Files PDF 1_s2.0_S0958946520302122_main.pdf 4.13 MB Close viewer /islandora/object/uuid:dc620f66-3860-457e-be8d-ae87bd0d886e/datastream/OBJ/view