Imagine that you are appearing for an interview for the post of construction Supervisor.
If the interviewer asks :
” How much area of a slab can be cast with one transit mixer if the slab thickness is 6″ ?
What shall be your reply ?
This article takes you through the logical answer to this question.
Before proceeding further ,let me ask:
” What is a transit mixer ?
Some of you might explain :
” A transit mixer is a mixer mounted on a truck and it transports the ready mix concrete from the batching plant up to the actual site where it shall be cast. The concrete drum slowly rotates around its own axis so that the concrete does not become solid during the transit period.
“The normal transit mixer has a capacity of carrying 6 cum of ready mix concrete ”
Small transit mixers of 4.5 CuM capacity as well as jumbo transit mixers with carrying capacity of 7.5 CuM.
You already know:
1 CuM = 35.29 Cubic Foot.Cft
” How much area of a 6″ thick slab can be cast with 212 Cft of Concrete ?
( Concrete per transit mixer : 6 CuM or 6x 35.29 =212 Cft .)
Volume = area x depth.
Now let us put what we know in this equation:
212 Cft = Area x 6″
Now 6″ = 0.5 Foot or 0.5′.
Area = 212/0.5= 424 Sqft.