Lime With Cement
Addition of lime to cement mortar makes the mixture thicker and stickier while wet. Addition of cement to lime mortar acts as a pozzolan giving some degree of quick set, but this comes at a price, and is not recommended.
Three cement & lime mixes have been widely used.
- 1:1:6 is a satisfactory mortar mix for various purposes, but behaves as cement based mortar.
- 1:2:9 has been found to be prone to premature failure, and is no longer recommended
- 3:1 + 5% cement makes a lime mortar that firms up quickly, avoiding delays to work, but the addition of cement has been found to be associated with premature failures, and the practice is no longer recommended.
1:2:9 and 1:1:6 are frequently mistaken for lime mortars, but are considered cement mortars, as although they contain substantial amounts of lime, their properties are primarily those of cement mortar. 1:1:4 ( lime + O.P.C + sand ) is the usual mix for the experienced builder. NOTE this calculation is based on weight NOT volume.
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