Flexural behavior of hybrid hollow-core slab built with ultra high performance concrete faces

In this paper, a new hybrid construction of hollow core slab-type members, in which a middle hollow core layer of ordinary Portland cement concrete is sandwiched in-between a top and bottom layer of steel fiber-reinforced ultra - high performance concrete, is explored to examine their structural adequacy. The tests of beam-type specimens, cast without any traditional steel reinforcement, have confirmed adequate flexural strength. The structural behavior is characterized by almost linear response up to the peak-cracking load, followed by a post-cracking softening with increased deflection under declining load.