Mechanical and hygrothermal characterisation of cork concrete composite: experimental and modelling study

Abstract

The paper aims to present a new insulating material based on cork aggregates and cement designed for building applications. Samples are prepared by mixing natural cork aggregates, sand, cement and water. Four cork volume dosages are considered, 0, 25, 50 and 75% (relative to the sand). Samples are characterised in terms of hardened density, compressive and flexural strength, as well as thermal conductivity and hydric properties (moisture content, vapour permeability, moisture buffering value and absorption by partial immersion). Results show that increasing cork granule amount tends to increase moisture retention and buffering value but decreases density, thermal conductivity and mechanical properties. Depending on the cork content, cork concrete mixture can be used as thermal insulator or as a structural component.

Keywords:

• Cork
• cement
• moisture
• hygrothermal properties
• mechanical properties

Acknowledgements

The authors would like to thank ‘Liège Mélior’ for providing natural cork aggregates for making samples.