cement dosing is a built-in, variable-thickness folder concrete, which is a mixture of 1 part cement and 3 parts sand.
Calculation of required materials
For calculate the materials necessary for a certain cement dosing we have to calculate the area her. In the vast majority of cases, these surfaces are usually squares or rectangles; and its area is calculated by multiplying its length (in meters) by its width (in meters). If the surface is unique and regular, the formula will be applied only once. Clock Figure 1.
On the other hand, if surface it was more complex, composed of several forms, it will have to be decomposed into simpler forms calculate the areas separated
and add them the end. Clock figure 2.
Sand and cement
from surface May calculate the amount of materials necessary multiplying it
according to the amount of sand (in m3 per m2) and according to the amount of cement (in kg x m2). For an example folder 70 m2 and an average thickness of 3 cm ar:
Amount of sand = Area x m3 / m2 of sand
Sand = 70 m2 x 0.036 m3 / m2 =
Quantity of cement = Area x kg / m2 of cement
Cement = 70 m2 X 16.2 kg / m3 = 1134 kg
To know the number of cement bags that will be needed, it will be necessary divide kg of cement with 50 (kg), which is the contents of each bag:
Cement bags = 1134 kg / 50 kg = 22.68 = 23 bags
calculation of materials You can use spreadsheets to choose the thickness of the folder you want to create and enter only the particular data of the case (measurements and / or total area). In this worksheet you can to choose between 3 thicknesses: 2 cm, 2.5 cm and 3 cm:
An example of calculation of materials for a cement dosing (11.35 mx 6.50 m) and 2.5 cm thickness:
Source: Practical construction manual – Architect Jaime Nisnovich