HOW WE DO CONCRETE BY VOLUME BATCHING AT SITE ....
There are two methods of batching of concrete
1) By weigh batching- In which all the ingredients of concrete like cementitious , coarse, fine aggregate, water and admixture when discharge ( inlined bins to bucket / belt, silos to cement hopper,admixture from tank to admixture jar and water from water tank to water hopper ) is weight by suitable equipment generally known as Load cell is known as weigh batching, which is very accurate method with permissible variation is known as weigh batching.
2) By volume batching - It is a type of batching in which all the material is measure in volume , generally use in the area where it is impossible to go more manpower and where quantity of concrete is less ,Volume batching is generally done by a farma volume of this farma must be kept equal to volume of one cement bag .
Let start with one example :
we want to made M15 grade of concrete at site
We know ratio of ingredients in M15 concrete is 1:2:4
where 1 is cement
2 is Fine aggregate
4 is Coarse aggregate.
First of all we make a farma having volume same as volume of one bag of cement
Let we assume length of farma 0.30 m, breath of farma also 0.30 m .
Than height of pharma
0.3*0.3*H = 0.035 ( 0.035 is volume of one bag of cement)
0.09 H = 0.035
H = 0.035 /0.09
= 0.38 m
so we got Length breath height of farma after this we make farma which volume is same as one bag of cement.
As volume of farma same as cement so it is full by one bag of cement
We want to make M 15 grade of concrete by volume batching at site
Than cement quantity for one measurement is 1 bag (as volume of pharma is 0.035 m3 i.e 35 ltr meaning is if we fill farma with cement it will be fully filled by 1 bag of cement)
Fine aggregate is twice of cement volume i.e 35*2 = 70 ltr ( i.e two bucket of farma)
corase agrregate is 4th time of cement volume i.e 35*4 = 140 ltr ( i.e Four bucket of farma)
35 ltr+70 ltr +140 ltr = 245 ltrs
i.e in one measurement we make 245 ltr = 0.245 m3 concrete so we make four more measurement for making 1 m3 of concrete.
we can also make calculation for admixture and water also by measuring jar .
let water cement ratio is 0.60
Than water quantity is = 30 kg i.e 30 ltr for 1 measurement of farma .( specific gravity of water 1)
let admixture dose is 1% cement weight in kg 50*1/100 = 0.5 kg = 500gm
500gm is divide by admixture specific gravity( 1.1) for volume batching = 454 ml
so for 1 measurement quantity of material
cement = 0.035 m3= one bag of cement
sand =70 ltr
coarse aggregate = 140 ltr
water = 30 ltr
adx = 454 ml
There are two methods of batching of concrete
1) By weigh batching- In which all the ingredients of concrete like cementitious , coarse, fine aggregate, water and admixture when discharge ( inlined bins to bucket / belt, silos to cement hopper,admixture from tank to admixture jar and water from water tank to water hopper ) is weight by suitable equipment generally known as Load cell is known as weigh batching, which is very accurate method with permissible variation is known as weigh batching.
2) By volume batching - It is a type of batching in which all the material is measure in volume , generally use in the area where it is impossible to go more manpower and where quantity of concrete is less ,Volume batching is generally done by a farma volume of this farma must be kept equal to volume of one cement bag .
Let start with one example :
we want to made M15 grade of concrete at site
We know ratio of ingredients in M15 concrete is 1:2:4
where 1 is cement
2 is Fine aggregate
4 is Coarse aggregate.
First of all we make a farma having volume same as volume of one bag of cement
Let we assume length of farma 0.30 m, breath of farma also 0.30 m .
Than height of pharma
0.3*0.3*H = 0.035 ( 0.035 is volume of one bag of cement)
0.09 H = 0.035
H = 0.035 /0.09
= 0.38 m
so we got Length breath height of farma after this we make farma which volume is same as one bag of cement.
As volume of farma same as cement so it is full by one bag of cement
We want to make M 15 grade of concrete by volume batching at site
Than cement quantity for one measurement is 1 bag (as volume of pharma is 0.035 m3 i.e 35 ltr meaning is if we fill farma with cement it will be fully filled by 1 bag of cement)
Fine aggregate is twice of cement volume i.e 35*2 = 70 ltr ( i.e two bucket of farma)
corase agrregate is 4th time of cement volume i.e 35*4 = 140 ltr ( i.e Four bucket of farma)
35 ltr+70 ltr +140 ltr = 245 ltrs
i.e in one measurement we make 245 ltr = 0.245 m3 concrete so we make four more measurement for making 1 m3 of concrete.
we can also make calculation for admixture and water also by measuring jar .
let water cement ratio is 0.60
Than water quantity is = 30 kg i.e 30 ltr for 1 measurement of farma .( specific gravity of water 1)
let admixture dose is 1% cement weight in kg 50*1/100 = 0.5 kg = 500gm
500gm is divide by admixture specific gravity( 1.1) for volume batching = 454 ml
so for 1 measurement quantity of material
cement = 0.035 m3= one bag of cement
sand =70 ltr
coarse aggregate = 140 ltr
water = 30 ltr
adx = 454 ml
This is very important blog.
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