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**

So now the original question is transformed like this:

**” 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 .)**

Or

**” How much area of a 6″ thick slab can be cast If 212 Cubic Feet of Concrete is available ? “**

Volume = length x breadth x depth

Area = length x Breadth.

Therefore,

**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′.**

So 212 Cft = Area x 0.5′

Or

**Area = 212/0.5= 424 Sqft.**

Now see if you can you answer the next question which us identical to the first one ?

**” How much area of a slab we can cast with two transit mixers if the slab thickness is 8″ and the concrete is of grade M25 ?**

Those of you who found out an** answer of 636 SqFt**. have understood the foregoing discussion correctly.

**Congratulations.**

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