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huangyhg

2009-09-16 10:28 AM

strength of a-30 concrete

strength of a-30 concrete
i need to evaluate an existing building that was designed in 1958. a-30, a-37.5 and a-50 concretes were specified. does anyone know the strengths? thanks.

所有的时间均为北京时间。现在的时间是 11:24 PM.