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Assessment of lightweight concrete thermal properties at elevated temperatures

Abstract: Structural lightweight concrete (LWC) has recently acquired research importance because of its good thermal insulation properties. However, there is a lack of knowledge about its thermal properties at elevated temperatures. The thermal properties, such as thermal conductivity and specific heat, of porous LWC vary depending on the aggregates, air voids, and moisture content of the LWC in question. To study these effects, in this paper, we measured the thermal properties of three types of structural LWCs at different temperatures, combining different characterization techniques, namely, differential scanning calorimetry (DSC), laser flash analysis (LFA), and modified transient plane source (MTPS). Bulk density and porosity were also evaluated. Specific heat is analyzed by the DSC technique from 20 to 1000 °C and the MTPS technique from 20 to 160 °C. Thermal conductivity is studied using MTPS and LFA techniques at temperatures ranging from 20 to 160 °C and 100 to 300 °C, respectively. The results indicate that the thermal properties of LWC are highly affected by moisture content, temperature, and porosity. For LWC, the current Eurocodes 2 and 4 assume a constant value of specific heat (840 J/kg°C). This research reveals variability in temperatures near 150, 450, and 850 °C due to endothermic reactions. Furthermore, for low temperatures, the higher the porosity, the higher the thermal conductivity, while, at high temperatures, the higher the porosity, the lower the thermal conductivity. Thus, Eurocodes 2 and 4 should be updated accordingly. This research contributes to a deeper understanding and more accurate prediction of LWC's effects on thermal properties at elevated temperatures.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Martínez-Martínez J.E., Álvarez Rabanal F.P., Lázaro M., Alonso-Martínez M., Alvear D., Del Coz-Díaz J.J.,

 Fuente: Applied Sciences, 2021, 11(21), 10023

Editorial: MDPI

 Fecha de publicación: 26/10/2021

Nº de páginas: 18

Tipo de publicación: Artículo de Revista

 DOI: 10.3390/app112110023

ISSN: 2076-3417

Proyecto español: PGC2018-098459-B-I00

Autores/as

MARTÍNEZ MARTÍNEZ, JUAN ENRIQUE

ÁLVAREZ REBANAL, FELIPE PEDRO

MARIANO LAZARO URRUTIA

MAR ALONSO MARTINEZ

JUAN JOSE DEL COZ DIAZ