Effects of Curing and Falsework Support Periods on Dead Load Deflections of Reinforced Concrete Slab Bridges.

摘要

Large variations in ultimate dead load deflections of reinforced concrete bridges have been observed. A research project was conducted to determine the influence of two parameters on the deflection of slab type bridges. Quarter-scale models of two identical three-span continuous reinforced concrete slab bridge prototypes were constructed and tested with variable curing times and falsework support periods. The difference in deflections between 10and 21day support periods was significant. An effective modulus of 500,000psi should be used in calculating ultimate deflections of reinforced concrete structures supported on falsework for only ten days.