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General Data > Concrete Mixes

The tables below shows standard concrete mix proportions that are used in the building industries. These recipes can be used when making and testing concrete in Chemistry lessons. These recipes are intended to be followed by builders for large scale concreting and as such, ballast and gravel sizes may need to be scaled down for small scale applications. For example, 20mm ballast will adequately reinforce and bulk out a concrete patio area but if used in a petri dish, will make the finished concrete very brittle because of the size of the grains.

Concrete

Application Proportions by volume
General purpose concrete 1 part cement
2 parts sharp sand
3 parts 20mm gravel

or

1 part cement
4 parts 20mm ballast
Paving / driveways 1 part cement
1.5 parts sharp sand
2.5 parts 20mm gravel
Fine concrete (paths, steps etc) 1 part cement
2 parts sharp sand
4 parts 10mm gravel
Foundations 1 part cement
2.5 parts sharp sand
3.5 parts 20mm gravel

or

1 part cement
5 parts 20mm gravel

Mortar

Application Proportions by volume
General use (bricklaying) 1 part cement
5 parts building sand
Render (first coat) 1 part cement
3.5 parts building sand  
Floor screeds 1 part cement
3.5 parts building sand

When using wet or dry cement, always wear gloves and eye protection. Always read the health and safety warnings on the pack before use.

The contents of this page are for information only. Please refer to CLEAPSS or ASE safety advice and/or publications before undertaking any preparation, practical experiment or using any equipment featured on this site or any other.