Effect of various additives on hydration of lime has been carried out. Lime which is formed by the calcining of lime stone (CaCO 3) at 1000 o C is of great importance. As, it is used in laboratory as reagent, in the manufacture of bleaching powder, glass & steel making, in agriculture as source of calcium and in water treatment, neutralization of soil acidity etc. More than 72% of lime stone is used in the manufacture of cement. Though free lime does not found in properly made Portland cement (generally found in its hydrated form) but it plays an important role in the setting of cement. Sometimes fast reactivity of lime decreases the strength of set cement due to false setting. By adding certain chemicals (retarders), the hydration of lime can be slowed down and it may help in overall increase in setting time as well as strength of set cement. Various additives-called retarders-are added to inhibit the setting of cement such as gypsum, sucrose etc.
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