Moisture and cracks are the two scourges of structural concrete, and understanding the interactions between the two is the key to determine long-term durability performances. This paper firstly deals with moisture migration and its volume change with creep in four inservice PC bridge viaducts that are experiencing excessive deflections by using a-3D integrated micro-material-structural modeling. It is found that moisture-migration related deflections driven by the capillary surface tension and disjoining pressures in micro pores account for 25 to 45% of the macroscopic deflections. These apparent kinematics can be approximated by adding the moisture-related time-dependent deflections to the mechanisticinduced creep by external loads. This paper then deals with water-crack interaction in RC bridge decks under moving loads. It is found that the water presence on the upper deck parts, when subjected to high-speed traffics, can shorten the deck fatigue life by one-and-a-half order of life-span. This reduction in life is due to high water pressure developing over a large numbers of wheel passages as well as the reduced shear transfer along crack planes.
|Title of host publication||Proceedings pro083|
|Subtitle of host publication||2nd International Conference on Microstructural-related Durability of Cementitious Composites|
|Editors||Guang Ye, K van Breugel, Wei Sun, Changwen Miao|
|Pages||20 - 28|
|Number of pages||9|
|Publication status||Published - 2012|
|Event||2nd International Conference on Microstructural-related Durability of Cementitious Composites - Amsterdam, Netherlands|
Duration: 11 Apr 2012 → 13 Apr 2012
|Conference||2nd International Conference on Microstructural-related Durability of Cementitious Composites|
|Period||11/04/12 → 13/04/12|
- Crack-water interaction
Maekawa, K., Suryanto, B., Fujiyama, C., & Chijiwa, N. (2012). Microstructure based life-cycle assessment and durability design of concrete bridges. In G. Ye, K. van Breugel, W. Sun, & C. Miao (Eds.), Proceedings pro083: 2nd International Conference on Microstructural-related Durability of Cementitious Composites (pp. 20 - 28). RILEM.