Autoclaved Aerated Concrete (AAC) blocks are lightweight, precast building materials that provide structure, insulation, and fire resistance. They are made from cement, lime, sand, gypsum, and aluminum powder, which creates air bubbles giving them their distinctive cellular structure. AAC blocks are cured under heat and pressure in an autoclave, making them significantly lighter than traditional clay bricks while maintaining excellent structural properties.

AAC blocks offer numerous advantages including superior thermal insulation, fire resistance, sound absorption, and faster construction times. They are eco-friendly, using fly ash as a primary raw material, and consume less energy during production. The lightweight nature reduces dead load on structures, allowing for more economical foundation designs and easier handling on construction sites.

Calculating AAC block requirements involves determining the wall area and dividing by the face area of individual blocks. The formula is: Number of blocks = (Wall length × Wall height) ÷ (Block length × Block height). Add 5-10% wastage for cutting, breakage, and fitting around openings. For example, a 10m × 3m wall needs approximately (10 × 3) ÷ (0.6 × 0.2) = 250 blocks, plus 5% wastage = 263 blocks.

Mortar quantity depends on joint thickness. AAC blocks typically use thin-joint mortar (6mm) which requires significantly less material than standard 12mm joints. The mortar volume is calculated based on joint area multiplied by thickness, then converted to dry volume and divided into cement and sand according to the mix ratio (usually 1:4). Thin-joint mortar reduces material costs and construction time while providing superior bonding.