Question { L&T, 49690 }

what"s the formula to find the cement,sand,aggreegate(45mm)
requirement for PCC?

Answer

For 100 cum

Cement should be in kg=(152/sum of proportion)*cement density
Sand should be cum=(152/sum of proporation)*sand ratio
percentage

Aggregate shuid be in cum=(152/sum of proporation)*
percentage of aggreagate
For PCC 1:4:8 (100CUM)

Cement=(152/13)*1*1440=16836.92kg
Sand=(152/13)*446.769 cum
Aggregate=(152/13)*8=93.53cum

Question { 33300 }

If in a structure, e.g, 20mm steel bar is not available and
we use 16mm steel bar instead of 20mm bar, how can we
calculate the no. of steel bars for 16mm diameter bar?

Answer

In beam /column
Total cross section area of 20mm=total cross section area of
16mm

(3.14/4)*20*20=(3.14/4)*16*16*no

No=400/256
=1.56

Question { Ramky, 10115 }

why primer application is required before applying putty

Answer

Primer application is a base coat