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Definition

The call

**cement dosing** is a built-in, variable-thickness folder __concrete__, which is a mixture of __1 part cement__ and __3 parts sand.__

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Calculation of required materials

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Surface

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.**

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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 =**

2.52 m3

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 **

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Spreadsheet

To simplify

**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