Ordinary Portland cement (OPC) is the most widely used type of cement in the concrete industry globally. Composed primarily of clinker—a mixture of limestone and clay—along with gypsum to control the setting time, OPC is renowned for its excellent strength properties and versatility in various construction applications. Available in different grades such as 33, 43, and 53, each number indicating the minimum compressive strength achieved in megapascals after 28 days, OPC adapts to diverse building requirements from residential constructions to large-scale civil engineering projects.