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strength of a-30 concrete

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发表于 2009-9-16 10:28:06 | 显示全部楼层 |阅读模式
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.
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