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Re: plastic concrete reinforcing chairs

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Please explain the structural impact if the contractor has got it all wrong?

Hermon F. Fox, P. E.At 03:13 PM 7/8/99 -0400, you wrote:
>?Has anyone used plastic concrete reinforcing support chairs? How well do
>they function? The contractor
>on a large school project has asked  to change from the specified steel
>chair reinforcing supports
>to plastic chair reinforcing supports. The brand he wants to use is Aztec
>E-Z Chair. He sent a
>sample and one cut sheet. The cut sheet does not indicate the load capacity,
>cold or hot weather
>performance. The contractor says that there is no difference in cost. I have
>found no information
>in Sweets or on the Internet on this company or plastic chairs. I will
>require more information
>from the contractor. The sample seems to have geometry that would cause
>voids in the concrete.
>
>Thank you!
>Hermon F. Fox, P. E.
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