Abstract
<p>Ultra-high performance concrete (UHPC) mixture proportions have been developed consisting of materials local to the state of New Mexico, USA. Researchers and precasters have been working together to implement the locally developed UHPC in a precast facility and establish economic and efficient mixing, casting, and curing procedures for production of prestressed structural members. This study investigates the development of two mechanical properties within the curing period: compressive strength and flexural tensile strength. The introduction of steam curing and high strength steel fibers is used to develop ultimate compressive strength in excess of 138 MPa and increased flexural tensile capacity. Specimens were tested at regular intervals in compression and four-point flexure to investigate early age strength gain, providing evidence to support earlier strand release and facilitate a more efficient precast process to ensure economic use of UHPC.</p>
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