This standard lays down the specific requirements for heavy-duty burnt clay building bricks, which are required for heavy engineering construction such as bridge structures, industrial foundations, and multi-story load-bearing walls. It specifies classification, dimensions, physical requirements like high compressive strength, low water absorption, and nil efflorescence.
Specifies requirements for heavy-duty burnt clay building bricks used in structures subjected to heavy loads.
Quick Reference Values
minimum compressive strength40 N/mm2 (400 kgf/cm2)
maximum water absorption10 percent by mass after 24h immersion
minimum bulk density2500 kg/m3
allowed efflorescenceNil
standard size 1190 mm x 90 mm x 90 mm
standard size 2190 mm x 90 mm x 40 mm
Practical Notes
Heavy-duty bricks have a significantly stricter water absorption limit (max 10%) compared to standard common bricks (which often allow up to 20%).
Do not confuse testing protocols; all physical tests for these bricks must be carried out in accordance with the IS 3495 series.
A brick cannot be classified as heavy-duty if its compressive strength falls below 40 N/mm2.