3. Shrinking:
hydraulic lime has much less tendency to shrink and crack and a small proportion of sand (equal or 1-1/2 times) cures it. If more sand is put the mortar becomes weak.
4. Hardening or setting:
In hydraulic lime the comples aluminium-calciun silicate splits into simpler compounds of calcium silicate and calcium aluminates which crystallize in the presence of water to form a hard mass of great strength even in the interior parts of structurre and the calcium hydrates highly solouble in water comes out to the surface, gets CO2 and crystallizes to CaCO3 and hardens.
5. Strength:
The silicates and aluminates formed by hydraulic lime are as hard as stone. Hydraulic lime is suitable in all positions where strength is required.
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