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Manufacturing - Operations - Surkhi Masino

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Published on July 30, 2019
Published by Gokul Kunwar
Viewed by 203 people
32.00 रू

Description of item

It is used as a substitute for sand for concrete and mortar, and has almost
the same function as of sand but it also imparts some strength. Surkhi is made
by grinding to powder burnt bricks, brick-bats or burnt clay ; under-burnt or
over-burnt bricks should not be used, nor bricks containing high proportion of
sand. When clay is especially burnt for making into surkhi, an addition of 10
to 20 per cent of quick lime will improve its quality ; small clay balls are
made for burning

for plaster may be made from slightly under-burnt bricks, and ground very fine
; this will improve the hydraulicity of fat lime. Surkhi must be well mixed
with lime, preferably in a mortar-mill. (Test for under- burnt bricks is that
they should not dissolve in water). Surkhi mortar gains strength if left
immersed in water.

It can
be used in all situations where surkhi can be used to give superior

Surkhi makes cement mortars and concretes more water proof,
more resistant to alkalis and to salt solutions than those in which no surkhi
is used.

This admixture is known to reduce the temperature rise during
hydration in a mass cement concrete and reduce cracking. It is also useful in
sea-water construction, in structures which are subject to attack from
aggressive ground waters or industrial waters, and in hydraulic structures
where water tightness is the first consideration. Surkhi mixed cement concrete is more
plastic, bleeds less and segregates less as compared to ordinary cement
concrete. A surkhi concrete of 25 to 50 mm slump is just as readily placed as a
corresponding straight cement of much higher slum. The proportion of surkhi
recommended is 10 to 30 per cent of cement (cement will be proportionately
less) but it must be ground as fine as the cement. Surkhi should riot be added
to aluminous cements. Surkhi is added both in mortar and concrete


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