High-strength concrete applications to prestressed bridge girders

摘要

This paper focuses on recent research conducted at the University of Minnestota on application of high-strength concrete to prestressed bridge girders. The research comprised production of high-strength concrete with a variety of cementitious materials (Portland cement, microsilica and fly ash) in different proportions, and made with six different types of coarse aggregate. Some specimens were moist-cured in saturated limewater at 73°F(23 deg. C); others were heat-cured in an environmental chamber at 120° or 150°F (50° or 65 deg. C) to simulate the accelerated curing technique used by precast/prestressed plants.