Thermal Behaviour of Insulating Building Mortars: Experimental Apparatus, Carbonatation and Ageing

  • A. Mourtada
  • A. Bloch
  • G. Menguy
  • M. Laurent


Thermal properties of insulating building mortars are dependent on those of their components.

Some properties of mortars change with age as well as on carbonatation phenomena. Carbonation develops only when moisture and carbon dioxide gas are present. The carbonation is due to the diffusion of carbon dioxide gas into the air in the pores; Fick’s laws are applicable in a first approximation.

In this study the thermal conductivity of the insulating mortars is determined as a function of ageing, moisture and components The thermal conductivity is measured in the conditions similar to these of utilisation.

In order to determine the variation of the thermal conductivity of insulating mortars as a function of humidity ratio, a series-parallel arrangement consisting of two layers is used. The thermal conductivity of the mortars is calculated. Values calculated in this way provided good correlations with test values for insulating mortars and a linear relation between the thermal conductivity and the initial dry density is obtained.

It is shown finally, that acting on the composition (nature of components, cement/lime ratio) it is possible to improve the quality of the mortars.

This study deals with the influence of ageing (carbonatation) moisture and composition on the thermal conductivity of an insulating mortar.


Thermal Conductivity Thermal Conductivity Measurement Moisture Ratio Humidity Ratio Capillary Porous Body 
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Copyright information

© Purdue Research Foundation 1985

Authors and Affiliations

  • A. Mourtada
    • 1
  • A. Bloch
    • 2
  • G. Menguy
    • 1
  • M. Laurent
    • 3
  1. 1.Lyon 1, Laboratoire d’Etudes Thermiques et SolairesVilleurbanneFrance
  2. 2.Weber et BroutinSaint Paul de VaraxFrance
  3. 3.Laboratoire de Physique IndustrielleInsa LyonVilleurbanneFrance

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