Two columns, which were made of composite ste el concrete of C60 , a ppeared as serious cracks three months after casting.

 
  • 某工程,兩根采用C60混凝土的勁型鋼筋混凝土柱,在澆筑后三個(gè)月,發(fā)現嚴重的縱向開(kāi)裂。
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