As the core load-bearing component of highway bridges, 35m box girders require concrete with high strength, high durability, and good construction and workability.
C50 concrete has become the mainstream choice due to its adaptability.
This article combines the practice of a 35m precast box girder project on a certain expressway, and based on the “Technical Specification for Construction of Highway Bridges and Culverts” (JTG/T 3650-2020), presents the complete process of mix design from design basis, parameter determination, step-by-step calculation to experimental verification, providing practical examples for similar projects.
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