PIV f
2w- If kept under water a fat lime paste does not lose its high plasticity and consequently
does not set and hard. - sp. gr. of pure lime is about 3.4.
X Fat lime finds extensive use in making mortar, matrix for concrete, base for distemper
and in white wash, manufacturing of cement, and metallurgical industry.
g
2@sX2UIPA
Bureau of Indian standards has classified lime into class A, B, C, D, E and F based on the
purpose of its use in construction.
g2e%i 2r 2v is used for making mortar and concrete for construction
and foundation works, i.e. for structural purposes.
g
(i) The colour is grey.
(ii) Calcium oxide and clay are 60-70 and 25 per cent respectively.
(iii) Slakes with difficulty.
(iv) Sets and hardens readily under water with initial setting time 2 hours and final setting
time 48 hours.g2f% 2r 2v is used for masonry mortars, flooring and for concrete in
ordinary constructions and plaster undercoat.
g
(i) The colour is grey.
(ii) Contains 70 per cent calcium oxide and 15 per cent clay.
(iii) Slakes and sets at slow rate taking about a week to set under water.g2g%p2v is used for finishing coat in plastering, white washing and with puzzolana
in mortars.
g
(i) The colour is white.
(ii) Slakes vigorously and increases to three times its original volume.
(iii) Contains about 93 per cent calcium oxide and about 5-7 per cent clay.g2h%w Gh 2v is used for finishing coat in plastering and white washing.
g
(i) The colour is white.
(ii) Contains about 85 per cent calcium and magnesium oxides.
(iii) Slakes promptly.
(iv) Sets slowly.