Beer brewing could help make better bricks
THERE'S more to brewing than beer. A by-product of the process could be about to give an upgrade to a workhorse building material â" red clay bricks. By blending in the grains left over from making beer, the bricks can be more environmentally friendly and better insulators. Bricks are often impregnated with polystyrene as a way to enhance their heat-trapping abilities. This is appealing, because the bricks remain strong, and they can be built into energy-efficient buildings, says Eduardo Ferraz of the Polytechnic Institute of Tomar in Portugal. However, EU restrictions on carbon emissions have made it expensive to incorporate polystyrene and other synthetic materials into bricks. Ferraz and his colleagues have now shown that brewery grains can be mixed into clay bricks to enhance their ability to trap heat, without compromising strength. Spent grain for the process should be easily available, because commercial breweries pro...