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Ultra-High Performance Concrete Bridge I-Girders


Modern concrete technology for precast elements

 


Ultra-high performance concrete (UHPC) is a new class of concrete that has superior performance characteristics compared to conventional concrete. Despite of its advantages, UHPC is not commonly used in the precast/prestressed concrete industry. The main impediments to the wide spread of UHPC are: 1) The high cost for proprietary mixes, 2) Absence of user-friendly mixing and quality control procedures, and 3) Lack of technology and experience required to produce UHPC. The objective of this research is to produce economic user-friendly mixes to be used in fabricating precast/prestressed bridge I-Girders. Targeted mixes were achieved by using supplementary cementitious materials, low water-to-powder ratios, and high range water reducing chemical admixtures. Developed mixes had a 24-hour minimum compressive strength of 69 MPa, 28-day compressive strength of 104 MPa, and a minimum spread diameter of 64 cm. Developed mixes were used in producing precast/prestressed girders with superior strength characteristics at Coreslab Omaha, Inc. The developed girder had superior shear and flexural strengths compared to similar tested girders fabricated with normal concrete mixes.

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CPi worldwide journals are trade journals for the concrete and precast concrete industry that are published in 10 different language editions in more than 170 countries. These trade journals, with their practical editorial reporting on research, production and applications, are specifically addressing the decision makers of the concrete and precast concrete industry.

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