'Cellular lightweight concrete' is made by:
Choose the correct answer
Adding expanded clay or expanded shale
Introducing air bubbles via preformed foam or aluminium powder gas generation — produces low-density insulating concrete
Using large aggregates with voids
Mixing bitumen with cement
Correct Answer
B. Introducing air bubbles via preformed foam or aluminium powder gas generation — produces low-density insulating concrete
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Cellular (foam) concrete: cement + water (+ sometimes fine sand) + preformed foam or aluminium powder that generates H2 gas. Density 300–1800 kg/m³ (compare: NWC = 2400 kg/m³). Very low thermal conductivity (insulation). Low strength (1–10 MPa). Uses: non-structural insulation panels, void filling, floor screeds. Also called aerated autoclaved concrete (AAC) if steam-cured in autoclave.
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