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Lime and Mortar Yield – The Facts

For many years hydrated lime was added to cement mortars to achieve the required working properties. CPI can supply these lime/sand/cement mortars if required.

Nowadays air entraining plasticizers are readily available as the ideal means of achieving a consistent and workable mortar with excellent durability and these are used by CPI to produce our high performance sand/cement mortars.

In recent times claims have been made in the mortar industry that mortars containing lime have a higher yield.

As a producer of both these mortars we would refute these claims as factually incorrect. To clarify the matter, we have commissioned the Building Research Establishment (BRE) to conduct an independent investigation. Please click here to download the full BRE report.

Here are their results:

  • Based on mix proportions by dry weight, a typical CPI EuroMix 1:6 class iii (M 2.5) sand/cement mortar has a wet density of 1620kg/m³.
  • This compares to the wet density of a typical CPI EuroMix 1:1:6 class iii (M 2.5) lime/sand/cement mortar of 1700kg/m³.

So what does this mean in practice?

When both dry mortar products are mixed with water and when the air contents are similar, the yield shall be similar.

At CPI we offer our customers total solutions in dry masonry mortars. That means whether you require a sand/cement mix or a lime/sand/cement mix, the choice is yours!

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