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Understanding C30 Concrete and Where It Fits For many domestic building projects, choosing the right concrete grade is a decision that affects everything from durability to cost. C30 concrete is one of the most commonly specified grades for foundations, driveways, and ground floors. With a compressive strength of around 30 megapascals (MPa) after 28 days, it offers a solid balance between workability and load-bearing capacity. But not every batch of C30 is the same, and sm