This study intends to find out the correlation between the cover depth and the bond characteristics\nof UHPC through pull-out tests of UHPC specimens with different cover depths and bond tests\nof rebar using flexural members. In this experimental study, specimens are fabricated with the\nlap-splice length as test variable in relation with the calculation of the lap-splice length for 180-\nMPa UHPC. Moreover, specimens are also fabricated with the cover depth as test variable to evaluate\nthe effect of the cover depth on the UHPC flexural members. The load-displacement curves\nare analyzed for each of these test variables to compute the lap-splice length proposed in the\nK-UHPC structural design guideline and to evaluate the influence of the cover depth on the flexural\nmembers. As a result, the stability of the structural behavior can be significantly enhanced by increasing\nslightly the cover depth specification of the current UHPC Structure Design Guideline\nfrom the maximum value between 1.5 times of rebar diameter and 20 mm to the maximum value\nbetween 1.5 times of rebar diameter and 25 mm.
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