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Cement, shown in Figure 1, is the essential binding ingredient in concrete, one of the most durable construction materials known to humankind. A paste of cement and water is the glue that binds sand and gravel together to form the rock like substance, concrete, that is used to build the structures in which we live and work, and the infrastructure that supports modern living. Both General Use, GU, portland cement and General Use Limestone, GUL, portland-limestone cement represented by this EPD are considered General Use hydraulic cements.