Pontificia Universidad Católica de Chile Pontificia Universidad Católica de Chile
Remesar J.C., Vera S. and López M. (2017)

Assessing and understanding the interaction between mechanical and thermal properties in concrete for developing a structural and insulating material

Revista : Construction and Building Materials
Volumen : 132
Páginas : 353-364
Tipo de publicación : ISI Ir a publicación


Highly thermal insulated building envelopes are the base of energy efficient buildings worldwide, however,concrete show poor thermal insulation properties. Developing a structural and thermal insulatingconcrete is challenging because improving thermal properties undermines mechanical properties. Thisstudy aims to understand the interactions between thermal and mechanical properties of concrete(conductivity-to-strength efficiency), when modifying the matrix and aggregate phases by adding flyash (FA) and coarse and fine lightweight aggregates (LWAs). Based on the ratio fc/k, the highest efficiencywas given by the addition of LWAs (0.017 [W/mK]/MPa) in comparison with the addition of FA(0.008 [W/mK]/MPa). Nevertheless, those efficiencies are highly dependent on the interaction betweenthe aggregate and matrix phases. The optimization of one phase only is not enough to obtain a structuralinsulating concrete because the thermal conductivity-to-strength efficiency is governed by both, theaggregate and the matrix.