The Bond Strength Of Rusted Deformed Bars
Bruce Johnston And Kenneth C. Cox
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Results of about 420 bond pull-out tests on deformed bar specimens of 78 different sizes or degrees of rust are reported - three different series. In the first, bars were selected from a stockpile and were classified as to degree of rust. Although these bars were of thesame nominal size and type it was found that small differences in the size of lug produced a greater dif- ference in test results than the degree of rust. In the second series, deformed bars of different sizes cut from identical stock were stored both in a moist room and out of doors in an exposed position, The time of exposure was a variable and the maximum time for the out-of-door exposed specimens was I5 months. The third series of tests consisted of bars exposed out of doors as a check test on the results of the second series.