Abstract
The bond performance and bond-slip constitutive model for rebar embedded in polypropylene fiber concrete modified by rubber powder (RPFC) are studied in this paper. 99 specimens are casted for pull-out test in order to investigate the failure mode and full bond-slip process, which are designed on the parameters of rubber powder content (0, 5%, 10% and 15%), polypropylene fiber content (0, 0.5%, 1% and 1.5%) and W/C. In order to quantitatively study the bond stresses distribution along the anchorage length, three types rebar including full cross-section, half cross-section, and inside-grooved are adopted. On the basis of the results of bond stresses distribution along the anchorage length, anchorage position function is accomplished. In this paper, the crack propagation of RPFC and plain concrete and full-field rebar strain are monitored by digital image correlation (DIC) technique. According to the experimental conclusions, a refine bond-slip constitutive model for RPFC is developed in consideration of anchorage position function. The bond-slip correlation between RPFC and the rebar could be precisely depicted by the proposed model.
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