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OPC (Ordinary Portland Cement) and PPC (Portland Pozzolana Cement) are two types of cement used in construction. The main differences between OPC and PPC are: 1. Raw materials: OPC is made from limestone, whereas PPC is made from a mixture of limestone and pozzolanic material such as fly ash or volcanic ash. 2. Strength: OPC has higher early strength, whereas PPC has higher long-term strength due to its pozzolanic material content. 3. Setting time: OPC has a shorter setting time than PPC. 4. Durability: PPC has better durability and resistance to chemical attacks than OPC. 5. Cost: PPC is generally cheaper than OPC due to the lower cost of raw materials used in its production. 6. Environmental impact: PPC has a lower carbon footprint than OPC due to the use of pozzolanic material, which reduces the need for clinker production, a major contributor to greenhouse gas emissions. Overall, the choice between OPC and PPC depends on the specific requirements of the construction project and the availability of raw materials in the region.

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