Civil Engineering - Building Materials - Discussion

44. 

For making fly-ash building bricks, the following mix of fly-ash, sand and lime, is

[A]. 80 : 13 : 7
[B]. 70 : 20 : 10
[C]. 60 : 35 : 5
[D]. none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Raju said: (Dec 21, 2017)  
The raw materials for Fly Ash Bricks are:

Material ------ Mass
Fly ash ------ 60%
Sand/Stone dust ------ 30%
Ordinary Portland Cement/(Lime+Gypsum) ------10%
Total formula of material ------100%

The strength of fly ash brick manufactured with the above compositions is normally of the order of 7.5 N/mm2 to 10 N/mm2.

Fly ash bricks are lighter and stronger than clay bricks.

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