1 part Cement 2 parts Sand 3 parts Aggregate (usually gravel or crushed stone)
To create a concrete mix using the 1-2-3 rule:
Begin by measuring out the required amount of cement (1 part).
Add twice that amount of sand (2 parts) to the cement. Mix them together thoroughly until they are well-blended and have a consistent color.
Finally, add three times the amount of aggregate (3 parts) to the mixture of cement and sand. Again, mix everything together thoroughly until the aggregates are evenly distributed throughout the mix.
It's important to note that while the 1-2-3 rule provides a basic guideline for estimating proportions, it doesn't account for variations in the specific materials you're using, the desired concrete strength, or other factors that may require adjustments. For critical applications or when precise control over the concrete mix is necessary, it's advisable to follow a concrete mix design provided by a structural engineer or to use pre-packaged concrete mixes that specify the ratios and characteristics.
