關鍵前一秒 上 .... 下一秒會很痛吧..
4000 psi VS 5000 psi Concrete - Structural engineering other technical topics - Eng-Tips 好痛..光用想的.. 也太高了 下一秒濕身 喔..剛好捕捉到 關鍵"那一秒"!! &nbsAgree with Ron. My minimum for a sewage treatment plant would be 40 MPa, about 6000 psi. Strength of concrete is normally a minor consideration in sewage treatment plants, but durability is paramount. May be a roundabout way, but specifying higher strengt...
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