The researchers found that the bricks have substantially reduced thermal conductivity relative to a clay control, as can be seen in the figure. A reduction of 14.4% in thermal conductivity relative to the control was observed for a 10 wt % addition of ash, and for a 20 wt % addition of ash, a 16.8% reduction in thermal conductivity relative to the control was observed, showing that the composite materials not only maintain strength and are more fuel-efficient to transport, they also are better insulators, which makes this composite material more attractive than conventional clay bricks for building construction.
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