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Concrete Casting News from the Hill and Griffith Company

Review of Aberdeen Group's Report "How Clean Must Rebar Be?"

Posted by Hill and Griffith Company on Aug 24, 2017 3:54:05 PM

This report is a series of bond pull-out tests to assess the effect of contaminants on bond strength.

How clean must rebar be? The results may surprise most inspectors. Without such data, most inspectors take a conservative approach by requiring removal of such materials from rebar. But removing contaminants is time-consuming, and if construction contaminants aren’t detrimental to bond, their removal may not be necessary.

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A typical setup for a pull-out test included a tension/compression frame used to apply the load to the rebar. Slip of the rebar was measured with an electronic digital indicator.

Instead of pulling out of the concrete specimen, the rebar broke in eight of the nine sets of three tests. The tests were with with 100% contaminant coverage of the rebar for the worst possible case. Under these conditions, the contaminants didn’t adversely affect bond.

 

Read the full report here, "https://www.scribd.com/document/155461764/Rebar-Rust."

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