How much CFT/HEAD PAN of sand and gravel need for a bag of cement? -lceted LCETED INSTITUTE FOR CIVIL ENGINEERS

Mar 13, 2022

In this article, we explained how to determine the concrete mix ratio in relation to the number of head pans of sands and gravels that are actually needed for a bag of cement and How much sand and gravel need for a bag of cement.

What Is Concrete Mix Ratio?

Concrete mix ratio is the ratio of concrete materials such as cement, fine aggregate (sand), coarse aggregate (gravel) and water. This composite ratio is determined based on the type of construction and the composite designs of the materials.

How much sand and gravel need for a bag of cement?

Cement bags are generally available worldwide in different weights, some of which are 20 kg bag, 25 kg bag, 40 kg bag and 50 kg bag.

Therefore

1 Cement Bag In Kg = Volume Of Cement Bag In CFT

1 Cement Bag In Kg = Volume Of Cement Bag In Meter

1 Cement Bag In Kg = Volume Of Cement Bag In a litre

 Cement Bag In Kg Volume Of Cement Bag In CFT Volume Of Cement Bag In Meter Volume Of Cement Bag In Litres 20kg 0.49 CFT 0.0138 CUM 13.8 25kg 0.6125 CFT 0.0173 CUM 17.3 40kg 0.98 CFT 0.0277 CUM 27.7 50kg 1.226 CFT 0.0347 CUM 34.4

We will take M20 ratio of nominal grade concrete for this calculation

M-20 - 1:1.5:3

M15 grade of concrete then you have to use a concrete mix ratio of 1:1.5:3. In which 1 is part of cement, 1.5 is part of sand, and 3 is part of cement.

Therefore, according above table

1 Cement Bag In Kg = Volume Of Cement Bag In CFT

We will use 50 kg bag,

1 Cement Bag In Kg = 1.226 cft

So,

M-20 – (1=1.226):1.5:3

1.226 cft of cement = (1.226 x 1.5) cft of sand = (1.226 x 3) cft of gravel

M-20 = 1.226: 1.839: 3.678

Therefore 50kg of cement bag, need 1.839CFT of sand & 3.678 CFT for M20 concrete mix.

How much sand and gravel of head pan need for a bag of cement?

We will take the Nominal concrete mix ratio and convert it into a head pan mortar ratio

Nominal Concrete Mix Ratio

 Grade of Concrete - Normal Grade Concrete Ratio Compressive Strength N/mm2 Compressive Strength (PSI) M-5 1:5:10 5 725 M-7.5 1:4:8 7.5 1087 M-10 1:3:6 10 1450 M-15 1:2:4 15 2175 M-20 1:1.5:3 20 2900

We will take M15 ratio of nominal grade concrete for this calculation

M-15 - 1:2:4

M15 grade of concrete then you have to use a concrete mix ratio of 1:2:4. In which 1 is part of cement, 2 is part of sand, and 4 is part of cement.

To produce the required concrete quality 1 mortar head pan cement we need 2 mortar head pan sand and 4 mortar head pan gravel.

1 pan of cement = 2 pans of sand = 4 pans of gravels

According to the building contractors association, a 50kg bag of cement can fill up to 2 head pans full of cement. If this is correct, for each bag:

1 bag of cement = 2 pans of cement

1:2:4 = 2:4:8

2 pans of cement = 4 pans of sand = 8 pans gravel

Therefore,

1 bag of cement = 4 pans of sand = 8 pans of gravel

It means for every 1 bag of cement you will need 4 head pans of sand and 8 head pans of gravel to obtain concrete strength of grade M15 equal to 12 N/mm2

Examples

M-10 - 1:3:6

1 bag of cement = 2 pans of cement

1:3:6 Mix Ratio = 2:6:12 Pan Ratio

M-20 - 1:1.5:3

1 bag of cement = 2 pans of cement

1:2:4 Mix Ratio = 2:3:6 Pan Ratio

FAQ

How much head pan is there in one bag of cement?

1 bag of cement is equivalent to two head pans (large size).

1 bag of cement is equivalent to three head pans (medium size).

What is the weight of a cement bag?

Cement bags are generally available worldwide in different weights, some of which are 20 kg bag, 25 kg bag, 40 kg bag and 50 kg bag.

How many Litres is a 50kg bag?

34.4 litre - The volume of a 50 kg cement bag works out to be (50/1440) x 1000 = 34.4 Litres.

What is the meaning of head pan?

A head pan is commonly used on construction sites made of iron or plastic. It is used to transport soil or cement or concrete to the work area.