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what is the crushing strength of concrete paving slabs

Concrete is graded in strength using a system based on the compressive strength after 28 days of curing. This generates a value in Newtons per square millimetre (N/mm²) which results in mixes being referred to as, for example, C7.5 or C20, which means that a particular mix will achieve a minimum compressive strength of 7.5N/mm² or 20N/mm² after the 28 day curing period

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