The formula for mortar mix typically involves a ratio of binder (like cement or lime) to filler (usually sand), expressed in parts by volume.
Understanding Mortar Mix Ratios
Mortar mix ratios are generally represented by numbers separated by colons, such as 1:3, 1:2:9, or 1:1:6. These numbers indicate the proportion of each material.
- Binder: The first one or two digits represent the binder content, which can be cement, lime, or a combination of both.
- Filler: The last digit always refers to the filler, which is commonly sand.
Common Mortar Mix Examples
| Ratio | Binder | Filler | Description |
|---|---|---|---|
| 1:3 | One part cement or lime | Three parts sand | A general-purpose mix, where one part by volume of binder is mixed with three parts by volume of sand. |
| 1:2:9 | One part cement, two parts lime | Nine parts sand | A mix using both cement and lime, with a higher sand content. |
| 1:1:6 | One part cement, one part lime | Six parts sand | A balanced mix of cement and lime with a moderate amount of sand. |
Key Insights
- Volume Measurement: The ratios refer to parts by volume, not by weight.
- Adjusting for Use: The specific ratio used can depend on the intended application, required strength and workability.
- Type of Binder: Depending on the application, the binder component can be either cement, lime or a combination of both, as per the provided reference: "So a 1:3 mix could mean one part by volume of lime or cement to three parts by volume of sand."
For example, a 1:3 mix would mean that for every one bucket of cement or lime used, you would need three buckets of sand. This mix provides a good balance between workability and strength for general use.
