Building Materials, Third Edition

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 Lime mortar or putty should be kept moist till use and in no case its drying is
allowed. The mortar made of hydraulic lime should be consumed within one day and that with
fat lime within 2-3 days.

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It is prepared in the same way as lime mortar, with surkhi replacing sand. Surkhi should be
ground to pass through 4.75 mm sieve and about less than 15 per cent through 150 micron sieve.
Sand is also mixed sometimes. The mix proportions of surkhi mortar are given in Table 12.3.

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Also known as guarded mortar or gauged mortar is made by mixing cement and lime. The advantages
of lime-cement mortar are increased water retentivity, workability, bonding properties and
frost resistance. The mortar gives good and smooth plaster finish and is used in buildings.

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X2For low lime content, cement and sand are first mixed dry. Lime putty is dissolved
in water and added to the dry mix. The mix is then worked thoroughly with spades till uniform
consistency is obtained. For high lime content lime cement mortar is made in the mills; lime
and sand are first mixed separately in the form of paste for the entire day’s requirement. Then
cement is mixed with lime mortar in batches to be consumed in an hours time. The mix
proportions of lime-cement mortar are given in Table 12.4.

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