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EPD: Ready-mix concrete, 35 MPa, ASTM C94, MIX 4 (Holcim México, plant site Mexico City)
The declared unit for this LCA is 1 m3 of ready mix concrete manufactured at the Holcim México, S.A. de C.V. facility at coordinates Latitude 19°51 39 58, N Longitude -98°99 89 77 in Mexico City, Mexico, built in the year 2017. Concrete is defined as a composite material that consists of a binding medium (cement paste, hydraulic cement and water, and possibly one or more admixtures) embedded with fine aggregate (typically sand) and coarse aggregate (typically gravel) to form a hard, solid mass. (1) The different compressive strengths of concrete represent different use categories. Uses such as beams, columns, floors, slabs, and other structural construction are typically specified as concrete with a >30 MPa resistance at 28 days (2). There are five different ready-mix formulas modeled in this EPD. All five mixes are to be manufactured at the same concrete plant. The five mixes analyzed for this LCA are rated for structural construction with a measured MPa of either 35 or 40 MPa. Ready Mix 1 has a resistance at 28 days of 40 MPa. Ready Mixes 2,3,4, and 5 each have a resistance at 28 days of 35 MPa. (3) Table 1 below further defines the functional unit through the technical specifications of each mix and its ingredients.
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