Restrained Shrinkage Cracking of Concrete Bridge Decks: State-of-the-Art Review.

摘要

In the United States, restrained shrinkage cracking is a significant durability problem. The issues affecting restrained shrinkage cracking arise from design and construction practices, as well as material properties. The mechanisms of drying, autogenous, and carbonation shrinkage are presented and discussed along with related creep issues. Thermal stresses also play a role in bridge deck cracking. These stresses result from the heat of hydration, diurnal temperature changes, and solar radiation. Current and proposed test methods are introduced and evaluated. Both conventional and innovative methods of controlling drying shrinkage are presented. Some innovative materials are discussed, including: fibers, shrinkage-compensating concrete, shrinkage-reducing admixtures, and extensible concrete.