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跨度为8m、混凝土设计强度等级为C40的钢筋混凝土简支梁，混凝土强度最少达到（　　）N/mm2时才能拆除底模。[2013年真题]

9 查阅

A、28

B、30

C、32

D、34

参考答案:

B

跨度为8m的简支梁拆除底模时，混凝土强度至少要达到设计的混凝土立方体抗压强度标准值的75％，即40×75%=30MPa。

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