Q: Are fly ash bricks more expensive than clay bricks?

Per piece: fly ash bricks cost 5-15% more than common burnt clay bricks. However, total wall cost is often lower because: (1) Lower wastage during masonry (better dimensional accuracy); (2) Less mortar consumption (smoother surface); (3) Faster construction (consistent dimensions); (4) Higher strength allows thinner walls. Net wall cost typically 0-10% more than clay brick alternative.

Question 1

What is fly ash brick?

Accepted Answer

Fly ash bricks are masonry bricks made from fly ash + lime + gypsum + water, formed by hydraulic press, and steam-cured. Per IS 12894:2002. Higher compressive strength (10-15 MPa vs 7 MPa for Class A burnt clay), lower water absorption, lower density. Increasingly dominant in modern Indian metropolitan construction.

Question 2

What is the difference between fly ash brick and clay brick?

Accepted Answer

Fly ash brick: 60-70% fly ash + lime + gypsum; pressed and steam-cured. Higher strength (10-15 MPa), lower water absorption (<15%), lower density (1500-1700 kg/m³), longer service life. Clay brick: clay + sand fired at 1000°C. Lower strength (5-7 MPa Class B/C), higher water absorption (20%), heavier density (1700-1900 kg/m³). Fly ash brick is more sustainable (uses by-product), more consistent quality.

Question 3

Are fly ash bricks more expensive than clay bricks?

Accepted Answer

Per piece: fly ash bricks cost 5-15% more than common burnt clay bricks. However, total wall cost is often lower because: (1) Lower wastage during masonry (better dimensional accuracy); (2) Less mortar consumption (smoother surface); (3) Faster construction (consistent dimensions); (4) Higher strength allows thinner walls. Net wall cost typically 0-10% more than clay brick alternative.