Concrete grade hides great stress, different strength corresponds to different projects, the wrong choice directly affects safety!
C15 and C20 have low strength and are only suitable for light load scenes such as cushion and non-bearing wall; C25 to C30 are enough for multi-storey buildings and urban secondary roads, and can stably bear daily loads; C35 and C40 are specially used for carrying high-rise core tubes, large-span bridges and heavy industrial plants, and their hardness is close to granite, so they are difficult to be damaged by conventional tools. Only by choosing the right strength grade, can project be safer and more durable.
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