PPC or Portland Pozzolana Cement is a kinds of blended cement which is processed by clinker, 15-35% pozzolanic and 4% gypsum material. As per BIS, PPC is a 33 grade cement. PPC makes the concrete more impermeable and dense by reacting with calcium hydroxide freed by the hydrated Portland cement and forming cementatious compounds. It can be safely used in the building of hydraulic structures, marine works, mass concreting, and other applications. It prevents the alkali-aggregate reaction in concrete.
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The binding property and strength of the cement depends on its capacity for chemical reaction, which can take place in the presence of water. Cement tends to absorb moisture and react with it chemically. The basic requirement is that, the cement should not come in contact with water or moisture until it is used. If it does, it will react and form lumps- after which it will lose its reactivity and this in turn will result in less strength. Remember, cement loses strength as it ages.Reduction in binding property of cement and strength of cement
|Age of cement (day)||Reduction in strength|
Note: BIS prescribes that cement should be used within 90 days of production. If it is used at a later date, it should be tested before being used.