Flexural hybrid span beam

A method for producing a flexural hybrid span beam, the method comprising:

• casting a first layer of ultra-high performance concrete (UHPC) into a bottom of a mold, the first layer comprising steel fibers that are randomly oriented and dispersed;
• self-curing the first layer for at least 48 hours to form an unfinished top surface of the first layer such that the first layer is not completely cured and reaches a cure of 15-50% of design strength;
• casting a second layer of a plain concrete, over the unfinished top surface of the first layer, in the mold, wherein the second layer of the plain concrete is not reinforced by steel bars;
• curing the first layer and the second layer to form the flexural hybrid span beam;
• and
• removing the flexural hybrid span beam from the mold,
• wherein the flexural hybrid span beam consists of the first layer and the second layer, an interface between the first layer and the second layer is flat and has a periphery conforming to a cross-sectional shape of the mold, the first layer is the bottom layer of the flexural hybrid span beam, and the second layer is the top layer of the flexural hybrid span beam.