What is the best substitute for ordinary Portland cement in concrete, which can help bring down costs significantly in India

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Pozzolana cement can be used as an alternative for ordinary Portland cement as it can be produced with lowe...
Pozzolana cement can be used as an alternative for ordinary Portland cement as it can be produced with lower energy input than OPC cement giving one-third consumption in use compared with Portland cement. Low energy consumption is particularly prevalent with naturally occurring pozzolanas which will reduce production cost. Lower production costs mean lower prices for the consumer, enabling those who could not afford Portland cement to purchase and use a quality binding material.
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