Evaluation of Prevention against Saly Damage for Concrete Structures
under a Severe Saline Environment
By K. Yokoyama, G. Ohashi, T. Matsuda and M. Aoyama
Concrete Journal, Vol.42, No.3, Mar. 2004
- Synopsis
- The Oyashirazu coastal viaduct is a PC bridge constructed along the Sea of Japan in a saline environment. In the construction of this bridge, some countermeasures against salt damage such as increasing the cover depth of steel bars, coating the surface of the concrete, epoxy-coated reinforcing steel bars and waterproofing of the slabs were adopted. About 15 years have already passed since this bridge was constructed. Therefore we conducted the follow-up surveys and monitoring of the countermeasures. From the results, it has been found that chloride ion penetrability of concrete is reduced due to lower water-cement ratio, and that epoxy-coated reinforcing steel bars in this bridge are sound. Also, it is clarified that the waterproof sheet can prevent against salt penetration of this slab.
- Keywords:
- concrete bridge, prevention against salt damage, chloride ion penetrability, epoxy-coated reinforcing steel bars, waterproofing, monitoring
