Why we use Gauge Box in Construction Site | How to Use a Measuring Box || By CivilGuruji

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In this video Er. Kishan Ojha Corporate Trainer Of Civil Guruji Is Explaining Why we use Gauge Box in Construction Site | How to Use a Measuring Box
1. A concrete proposal for you:
2.You mean you don’t know RMC ?
3.Confirmed concreting ?
4.Entangled in RCC ?
Remember :
To supervise the manpower at site certainly requires skills but if you can do quantity estimation, bills verification etc and also control manpower , your compensation shall rise in steep curve.
So, please don’t ever skip the calculations part while learning the construction.
A CEMENT BAG WEIGHS 50 KG AND HAS A VOLUME OF 35 LITRES.
Volumetric batching of the concrete.
There are two distinct methods of proportioning the ingredients for concrete :
1. By the measuring box
2.By the buckets ( Hindi : Ghamela ,Tagari & Marathi :Pati,)
Both methods are in actual use at the construction sites where volumetric batching is followed.
Remember :
1.The RMC plants , however, do the batching of concrete based on the design mix and hence weigh batching is practiced.
2.Certain sites also practice the design mix at site and use weigh batching .
The discussion on S.nos 1 & 2 is excluded from the present post.
We are talking about only those construction sites which manufacture the concrete at the site
( In short : Nominal mix , Mixed at site & cast in situ concrete ) .
THIS KIND OF CONCRETE WE ARE TALKING IN THIS ARTICLE.
NOMINAL MIX,
PROPORTIONED , MIXED & PLACED AT SITE
THE MEASURING BOX
[ FARMA ] WHICH MEASURES 12″ X12″ X15 ” OR 1.25 CFT.
OR 43.75 LITRES
You must be thinking :Is there is any significance of keeping this size of the measuring box ?
Right ?
So first let us see the importance of this size.
The cement bag has a standard weight of 50 Kg.
Cement has a bulk density of :1429 Kg/CuM.
Hence the volume of 1 bag of cement shall be
= 50/1429 =0.03499 CuM.
Since 1 CuM = 1000 Litres
therefore, the volume of 1 bag of cement shall be 0.03499 CuM.X 1000 Litres = 34.99 Litre.
For practical purposes, we can consider this volume to be 35 Litre.
How do we use the measuring box for batching different grades of concrete ?
1.Let us say we want to mix a concrete of grade M20 .
We know that the Nominal mix for M20 grade is : 1 :1.5 :3
since we are doing volumetric mix, this means that :
If we take
1 part of cement by volume,
we shall have to take 1.5 parts of sand measured in the same units and
3 parts of aggregate again measured in the same units .
So now , the same proportion 1 :1.5 :3 can also be written as :
1x 35 Litres : 1.5 x 35 Litres :3 x 35 Litres
or this can be further converted into :
1 bag of cement : 1.5 measuring boxes of sand : 3 measuring boxes of coarse aggregate.
Assuming that we have to maintain a water cement ration of 0.5 ,
we shall need 0.5 x 50 kg = 25 Kg or 25 Litres of water for one batch of concrete.
Now the steps are quite clear . Right ?
We start rotating the drum , pour about 10 Litres of water into the drum ,
Place 3 measuring boxes of coarse aggregate in the mixer drum ,
Followed by 1.5 measuring boxes of sand ,
Add remaining water , and then finally place 1 bag of cement in the drum .
One batch of concrete is ready to pour after rotating drum for about 1 to 3 minutes.
This concrete can now be transported to the actual location either through trolleys or hoist and trolleys.

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