This study introduces a new type of precast, prestressed reactive powder concrete (RPC) bottom panel for alarge-span composite slab. The bottom panels, which have one or two inverted ribs with openings, act as formwork duringthe construction stage. The paper experimentally investigated the crack characteristics, deflection, and normal sectionbearing capacity of four precast, prestressed ribbed RPC bottom panels under flexural load. The results indicated that theRPC ultimate strain under non-uniform compression is 5500x10-6 and the plastic influence coefficient of the sectionmodulus is linear with the longitudinal reinforcement ratio. The tensile stress of RPC at the cracked section should beconsidered while calculating the flexural stiffness; the equation used to determine the nominal tensile stress of RPC as amajor variable for calculating the crack width at the bottom of panels was proposed. The bottom panels generally exhibitan over-reinforced failure mode behaviour without the composite layer; the calculation method of the normal section bearingcapacity of this mode was established.
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