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Re: Rebar Weight

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Kang, Sung-hoon,
        Many years ago (make that decades ago) I recall reading a technical paper dealing with the use of rusted reinforcing steel.  The main point of the paper was that rusted reinforcing could be used provided that the rust was cleaned off and the weight of the cleaned reinforcing was acceptably close to the weight of new steel.
        It was at least 30 years ago that I read the paper and I have never had occasion to use the information; so the details are somewhat vague in my mind,  However, this could be related to your question.
H. Daryl Richardson
----- Original Message -----
Sent: Sunday, January 20, 2008 6:09 PM
Subject: Rebar Weight

Dear List Members,
I have the question about the weight of Reinforcing Steel Bar.
According to ASTM A615, The weight of the rebars shall be at least 94% of the applicable weight per unit length prescribed in Table 1.
It is the  6% margine that I am curious. What caused this 6% weight margine?
If anyone knows this reason, Please let me know!!
Thanks in advance.
Kang, Sung-hoon