Reinforced autoclaved aerated concrete (RAAC) is usually a reinforced Variation of autoclaved aerated concrete, generally used in roofing and wall construction. The very first structural strengthened roof and flooring panels have been manufactured in Sweden, quickly following the very first autoclaved aerated concrete block plant started up there in 1929, https://aacblockmanufacturingplan35566.ltfblog.com/27802394/aac-block-manufactur-ing-plant-an-overview