One common question from readers concerns requirements for removing form release over-spray from rebar. “It's time to replace guesswork with data that can eliminate the unwarranted expense of correcting problems that may not exist,” stated Editor Ward Malisch in the June 1998 issue. In the interest of encouraging ongoing field research, CONCRETE CONSTRUCTION sponsored a series of bond pull-out tests to assess the effect of contaminants on bond strength. According to the report published in that issue, “The results may surprise most inspectors. … Instead of pulling out of the concrete specimen, which would be expected if the contaminants completely destroyed bond, the rebar broke in eight of the nine sets of three tests.”
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