concrete is usually expressed by "C" plus a number, and the unit of value is MPa. For example, C30 means that the compressive strength of concrete after 28 days of curing under standard conditions is 30 MPa. Then
different construction projects and construction parts need to use different strength grades of concrete, generally there is a certain range of selection.
C10 ~ C15-used for cushion, foundation, terrace and structures with small stress.
C20 ~ C25 — — Used for ordinary reinforced concrete structures such as beams, slabs, columns, stairs, roof trusses, etc. (Rural self-built houses, brick-concrete houses in old residential areas)
C25 ~ C30 — — Used for large-span structures, structures requiring high durability, prefabricated components, etc. (Living rooms of residential buildings, Roof bearing plate, etc.)
C40 ~ C45-used for prestressed reinforced concrete members, crane beams and special structures, etc. For 25 ~ 30 floors (urban commercial housing)
C50 ~ C60-for high-rise buildings with 30 to 60 floors (urban landmark office buildings)
C60 ~ C80-for high-rise buildings. Use of high performance concrete (urban viaduct, super high-rise residential buildings)
C80 ~ C120-use of ultra-high strength concrete in high-rise buildings (super high-rise core stress components, large-span special bridges)
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