THERMAL-CONDUCTIVITY OF A CELLULAR CLAYEY CONCRETE - THE CASE OF A WEIGHT-REDUCTION BY POWERED ALUMINUM

Thermal conductivity of a cellular clayey concrete: the case of a weig ht reduction by powdered aluminium. The clay waste resulting from the exploitation of a large number of aggregate quarries ave not really us ed at the present time. New technologies have been developed to recycl e this waste by making insulating materials. The clay-cement mixture i s lightened by powdered aluminium reacting with lime produced during t he cement hydration, giving hydrogen bubbles. A good distribution of b ubbles is dependent on components, atmosphere and rheologic properties of the wet mixture. So, in the first part, the authors present the in fluence of the different components on the thermal conductivity. They demonstrate the potential for reaching some good thermal performances with sufficient mechanical characteristics. At that point, the validat ion of experimental results can be seen in comparison with mathematic models already verified for autoclaved aerated concrete.