Lean concrete is a mix where the amount of cement is lower than the amount of liquid present in the strata. This makes it ideal as a base layer where other kinds of concrete are placed on top. It is good for providing a flat bottom in uneven or dirt terrain. Lean Concrete is ‘not Rich’, in other words, the ratio of cement to water and of course to aggregate would be below.
- M5 Grade of concrete → 1:5; 10 (cement: sand: aggregates) {5mpa}
- M7.5 Grade of concrete →1:4:8 (cement: sand : aggregates) {7.5mpa}
- M10 Grade of concrete →1:3:6 (cement :sand: aggregates) {10mpa}
Advantages of lean concrete
1- the main function of lean concrete is to provide a uniform surface to the foundation concrete and to prevent the direct contact of foundation concrete from the soil.
2- Lean concrete is used under the foundations.
3- Lean concrete is used to provide a level surface, where the main foundation (raft, isolated, or any other type) can be placed.
4- Another purpose is the protection of the main foundation from soil below, as moisture or other chemicals in the soil like sulfates may attack concrete and can weaken it.
If you need a quality foundation and the entire structure as a whole, then use lean concrete.
For more information watch this video
