**Estimating Cement and Sand Quantity for Mortar Mix**

Cement mortar is a well-known partner of concrete hollow blocks (CHB) and other masonry blocks. It's what binds masonry blocks together. Cement mortar material quantity can be estimated in a variety of methods. One of the easiest ways to estimate cement mortar material quantity is by area method.

**HOW TO ESTIMATE THE QUANTITY OF CEMENT AND SAND FOR YOUR MORTAR MIX:**

- Determine your initial wall area:
- Determine the specified kind of mixture:
- Determine the wall area:
- Based on the specified kind of mixture and CHB thickness and size, multiply your area with the corresponding values from the mortar proportion table:

Concrete hollow blocks (CHB) vary in size. Local hardware stores usually have 3 commercially-available CHBs that vary in thickness – 4”(10cm), 6”(15cm) and 8”(20cm).

Same with concrete, mortar’s compressive strength depends on your material’s mixture and proportions.

Determine the area of your wall. The formula for a square wall is Length * Height.

**Square Wall Area = Length * Height**

Make sure to take into consideration the often-overlooked information that will affect the area of your wall – for example, the depth of your beam or the underground foundation CHB.

**SAMPLE PROBLEM 1**

Compute for the quantity of cement and sand needed for a Class “B” mortar mix of a standard 4” CHB wall that is 3 meters high and 2 meters long.

**SOLUTION**

- Determine the size and thickness of CHB to be used:
- Determine the specified kind of mixture:
- Determine the wall area:
- Based on the specified kind of mixture and CHB thickness and size, multiply your area with the corresponding values from the mortar proportion table:

Specified CHB thickness = ** 4” **

Specified mortar mix = **Class “B”**

** Square Wall Area ** = Length * Height

= 2m * 3m

** = 6m ^{2} **

** Quantity of Cement Bags ** = Area * Cement multiplier for a Class “B” mix

= 6m^{2} * 0.522

** = 3.132 bags ~ 4 bags **

** Quantity of Sand ** = Area * Sand multiplier for a Class “B” mix

= 6m^{2} * 0.0435

** = 0.261 m ^{3} **

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