Development of an In Situ Permeability Device for Concrete Structures:Final rept (1 Jul 2003-31 Oct 2004)

摘要

Durability is a very important factor for concrete structures. The concrete durability is significantly affected by its permeability. The penetration of the aggressive liquids, frost action, and steel corrosion are all influenced by the concrete's permeability. These problems could be decreased by reducing the permeability of concrete. Even though there are many well documented ways to reduce the permeability of concrete, there are very few non-destructive methods to measure the permeability of in place concrete. This research presents the development and evaluation of a new device to measure the air permeability of in place concrete. Several concrete mixtures with water to cementitious materials ratios (w/cm) ranging from 0.26 to 0.60 were evaluated using the in place device and a standardized test. The results from the research program show that the concrete air permeability (CAP) device has the potential to be a useful tool in measuring concrete permeability.