This standard specifies the dimensions, manufacturing requirements, and physical performance criteria for hollow and solid lightweight concrete blocks made from lightweight aggregates. It details testing methods for density, compressive strength, drying shrinkage, and water absorption to ensure quality in masonry construction.
Specifies requirements for lightweight concrete blocks used in masonry construction.
Quick Reference Values
maximum block density1500 kg/m³
maximum water absorption20% by mass
maximum drying shrinkage0.08%
maximum moisture movement0.09%
tolerance length± 5 mm
tolerance height and width± 3 mm
Practical Notes
Do not confuse Part 2 (lightweight aggregate blocks) with Part 3 (Autoclaved Aerated Concrete - AAC blocks); they have different densities and testing protocols.
Ensure blocks are adequately cured and thoroughly dried before use in masonry to minimize drying shrinkage and subsequent wall cracking.
Due to higher porosity, lightweight blocks may absorb water from the mortar rapidly; pre-wetting or using specific mortar consistencies is highly recommended.