How to calculate the quantity of concrete block and mortar for wall. And we know that concrete block for wall is made of Portland cement sand and find aggregate, for making wall of room concrete block is used in another option of brick wall in many country like India Newzealand, Australia, United States of America and etc.
In this topic we know about how to calculate the quantity of concrete block for wall and also calculate the volume of required mortar for block wall.
In UK, the common size of concrete block is typically about 440×215×100 mm (length × width × thickness.
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How to estimate mortar for block wall
To estimate mortar for a block wall, you’ll need to consider the size of the blocks, the thickness of the mortar joints, and the dimensions of the wall. Typically, a standard mortar mix for block walls is 1 part cement to 3 parts sand.
1. Calculate Block Volume: determine the volume of each block by multiplying its length, width, and height.
2. Determine Wall Dimensions: measure the length, height, and thickness of the wall.
3. Calculate Wall Volume: multiply the wall length by its height and thickness to get the total volume.
4. Account for Mortar Joints: subtract the volume of the blocks from the total wall volume to find the mortar volume needed.
5. Convert Mortar Volume to Bags: convert the mortar volume to cubic feet and then divide by the yield per bag (usually specified on the mortar mix bag).
How to estimate mortar for block wall?
To estimate how many 25kg bags of block mortar for block wall you need, simply divide the number of blocks by 5. For example block wall of 10 blocks would require 10/5 = 2 bags of 25kg mortar. As UK practices, a typical block wall requires 10 bricks per m2. For every 10 blocks measuring 440×215×100 mm requires two 25kg bags of mortar. So, you need 2 25kg bags of of mortar for every 10 block.
* Steps of calculation:-
how to calculate quantity of concrete block and mortar for wall
1) volume of given wall
2) volume of one concrete block
3) volume of one concrete block with mortar
4) number of concrete block
5) volume of all concrete block
6) volume of required mortar
7) quantity of cement calculation
8)quantity of sand calculation
* Given dimension:-
Size of block wall:-20’×16’×8″
Length of wall = 20 feet
Breadth of wall= 16 feet
Thickness of wall = 8 inch
Size of 1 concrete block
= 1’×8’×8′
Length of one concrete block
= 1 feet
Breadth of concrete block
= 8 inch
Thickness of concrete block
= 8 inch
*Calculation process and solve:-
1) Volume of block wall calculation
Wall size = 20′ ×16’×8″
8 inch = 0.666 feet
Volume= 20’×16’×0.666′
= 213.12 cft
2) Volume of one concrete block calculation
Size of 1 concrete block
= 1’×8’×8′
8 inch = 0.666 feet
Volume of one block
=1’×0.666’×0.666’=0.4443 cft
3) Volume of one concrete block with mortar
Let thickness of mortar is 1 inch or 25 mm,
Add one inch in length and breadth of concrete block size
Block size with mortar
= 1’1″×9″×8″
Convert all inch into feet
1’1″ =1.083′ , 9″ = 0.75′ ,8″ = 0.666′
Volume of 1 concrete block with mortar
Volume =1.083′ × 0.75’× 0.666′ =0.5414 cft
4) Number of concrete block calculation
Number of Concrete block is find by dividing total volume of block wall by volume of 1 concrete block with mortar
Block = volume of wall/ volume of 1 concrete block with mortar
Number of concrete block
= 213.12/0.5414 = 393.65 nos
5) Volume of all concrete block
= number of block × volume of 1 Block
= 393.65 × 0.4443 =175 cft
6) Volume of mortar is calculated by subtract volume of all concrete block from volume of block wall
Volume of mortar
= 213.12 _ 175 =38.12 cft
Wet volume of mortar
= 38.12 cft
We have to calculate dry volume of mortar in mix ratio of cement sand is 1:4, volume is increased by 33% so we multiply cofactor 1.33 in wet volume to calculate dry volume.
Dry volume = 1.33× 38.12 = 50.7 cft
From dry volume we can calculate quantity of sand and cement.
7) Quantity calculation of cement
Mix ratio of cement sand= 1:4
Total proportion = 1 +4= 5
hence in mix ratio cement is one part and sand is 4 part
Cement quantity
= 1×50.7/5 = 10.14 cft
1 bag cement = 1.226 cft
Number of bag of cement
= 10.14/1.226=8.3 bags
8) Quantity of sand
= 4× 50.7/5 =40.56 cft.
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See the amount of cement used in each building block on beton aloka site.
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