High Performance Concrete for Bridge A6130-Route 412, Pemiscot County, MO
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2004-06-01
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Abstract:For its significant economical savings and greater design flexibility, high performance concrete (HPC) is becoming more widely utilized in highway bridge structures. High performance bridges with HPC and large diameter prestressed strands are becoming attractive to designers. A prestressed high performance concrete (HPC) highway bridge was constructed in Missouri utilizing concrete with 56 day strength of up to 86 MPa (12,500 psi). The utilization of HPC allowed for larger girder spacing and longer spans than typically used in conventional prestressed concrete bridges. This project is sponsored by the Missouri Department of Transportation (MoDOT), the Federal Highway Administration and the University Transportation Center at the University of Missouri-Rolla. The Bridge A6130, in Pemiscot County near Hayti, Missouri, is a five-span simply-supported for dead load HPC highway bridge over main ditch, drainage ditch No.8 carrying Route 412. The span lengths for the bridge are 15.5 m (50.85 ft), 17.0 m (55.77 ft), 17.0 m (55.77 ft), 17.0 m (55.77 ft) and 15.5 m (50.85 ft). The bridge was designed with MoDOT type 2 I-girder in conjunction with HPC and 15.2 mm (0.6 in.) diameter prestressing strands. HPC materials for both girders and cast-in-place deck are studied for both mechanic and material properties including compressive strength, modulus of elasticity, splitting strength, freeze-thaw, abrasion resistance, de-icing scaling, ponding chloride, rapid chloride permeability, creep, shrinkage, and coefficient of thermal expansion. The completed bridge was instrumented to measure temperature and strain variations. This was combined with deformation measurements to determine how the bridge behaves in response to temperature changes, dead load, live load, creep, and shrinkage. Measured thermal behavior, strain behavior, prestress losses, camber and deflection are investigated by comparing with theoretical estimation for both early-age and later-age. Modified theoretical methods based on the test results were recommended. In addition, a live load test was completed for the bridge to study the load distribution and structure behavior due to live load. Two simplified models were developed and compared with measured values to investigate the continuity level of the MoDOT interior bent detail. MoDOT girder cross sections were studied for cost effectiveness by using high strength concrete. The objectives are to identify the limitations of the sections relative to the use of high-strength concrete in simple span structures and to examine the feasibility of modified cross sections that can be used to take advantage of the higher strength concrete that are currently available. Construction for HPC Bridge related issues were documented to give a reference for later construction for HPC bridges. The summary, conclusions and recommendations were given for HPC highway bridges in Missouri and for general HPC structures in US considering design, fabrication, construction and research.
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