How to calculate cement dosage

The first kind: approximate algorithm:

Take 10 square meter as an example:

Quantity of cement mortar 10*0.0 15 (average thickness) = 0.15m3.

Sand dosage is 0. 15* 1500kg (mortar sand dosage per cubic meter) =225kg.

The dosage of cement is 225/2.5=90kg (considering the mixing ratio of cement and sand 1: 2.5, this strength is enough).

You can calculate the actual area by yourself.

The second type: super professional algorithm:

Take a 25-square-meter courtyard wall as an example:

Check the engineering quota, according to the plaster layer calculated by the thickness of 2.5cm:

Cement dosage 10.6kg/m2 increases by 2. 12kg/m2 for every 5mm thickness increase, and so does the decrease.

When the sand dosage is 42.8kg/m2, the thickness will increase by 8.56kg/m2 for every 5mm increase, and so will the reduction.

This shows that your 25-square-meter wall needs 50-square-meter plastering on both sides, calculated according to the plastering thickness of 2.5cm:

The dosage of cement is 10.6kg/m2×50m2=530kg, which means 1 1 package cement.

The required sand quantity is 42.8kg/m2×50m2=2 140kg, that is, 2 tons of sand.

Let me provide you with a data of wall plastering first.

Check the engineering quota, according to the plaster layer calculated by the thickness of 2.5cm:

Cement dosage 10.6kg/m2 increases by 2. 12kg/m2 for every 5mm thickness increase, and so does the decrease.

The dosage of sand is 42.8kg/m2, and it will increase by 8.56kg/m2 for every 5mm thickness increase, so will the wall with 25m2. Consider using red brick (standard brick) with the specification of 240× 1 15×53, that is, its volume is 0.00 15m3. , mortar adopts 1: 3 ratio (because it is a courtyard wall, the strength requirement is higher). ?

Mortar dosage is 0.265m3/m3 (dosage per square× cement mortar thickness: 10.6×0.025=0.265) to build 240 walls, and one * * * is 6 cubic bricks, which requires 4,000 red bricks.

(25× 0.24 = 6 6/0.0015 = 4000 4000× 0.8 = 3200), that is, 3200 bricks are actually needed, or this value can be obtained by 128×25=3200. 128 block/m2 is an empirical value, which is directly used by old masons for calculation.

The required mortar is 0.265m3/m3× 6m3 =1.59m3.

The dosage of cement is 401kg/m3×1.59m3 = 637.59kg, that is, 13 bales.

The dosage of sand is1593kg/m3×1.59m3 = 2532.87kg, which is 2.5t

Build a wall of 120,1* * is 3 cubic bricks, and it needs 2000 red bricks.

The required mortar is 0.265m3/m3× 3m3 = 0.795m3

The dosage of cement is 401kg/m3× 0.795m3 = 318.8kg, including 7 packages.

The dosage of sand is1593kg/m3× 0.795m3 =1266.44kg, and one 1.5t is enough.

Note: All the above are theoretical values. For example, cracks in the wall should be considered in the actual decoration process. If the theoretical value of bricks needed for 1m2 wall building is 160, only 128 bricks are actually needed, that is, 164×0.78= 128 bricks (24 walls).

Third, the simple algorithm is as follows:

Just make it according to ordinary mortar, the water cement ratio is about 0.6, and sand and cement can be made according to 1: 1, or even less. Or a bag of cement and two bags of sand can wipe 4 square meters. You can calculate the details yourself ~

Fourth: The most convenient algorithm is to let the bricklayer calculate.

Fifth: a more accurate algorithm.

Floor tile laying is: cement dosage and sand dosage.

Bricklaying is: cement dosage and sand dosage.

Area * paving thickness *0.33/0.04= quantity of bagged cement.

Area * paving thickness *0.66= cubic number of sand.

Area * paving thickness *0.25/0.04= quantity of bagged cement.

Area * paving thickness *0.75= cubic number of sand.