Innovative concrete bridging systems for pedestrian bridges : implementation and monitoring.

Two precast, prestressed pedestrian bridges were designed for rapid construction in Rolla, MO, utilizing high-strength concrete (HSC) and high-strength self-consolidating concrete (HS-SCC) with a target 28 day compressive strength of 68.9 MPa (10,000 psi) and release compressive strength of 24.1 MPa (3,500 psi). In addition, a glass fiber reinforced polymer (GFRP) bar reinforced deck panel system was utilized in one of the two deck panels on each bridge. Material properties were tested for compression, elastic modulus, modulus of rupture, splitting tensile strength, creep, and shrinkage following ASTM standards. instrumentation systems within the spandrel beams and precast deck panels were implemented to monitor early and later-age temperature and strain variations between the concrete mixtures and reinforcing types. In addition, the sensors were utilized to calculate the prestress losses for HSC and HSSCC in the spandrel beams. A live load test was completed one year after spandrel beam fabrication to investigate the differences in deflection of HSC, HS-SCC, and reinforcement types. All material and mechanical results were compared between HSC and HSSCC. Furthermore, the results were compared to standard empirical models presented by AASHTO, ACI, and PCI.

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