漏水解決案例

In the design of concrete structures, where concrete slabs and walls are used as the environmental barrier, water leakage is a concern. Monolithic concrete elements of compressive strength around 3000 psi, and as-thin-as one inch, are generally water-tight except at discontinuities.

Locations where concrete elements are not generally monolithic include:

• Temperature, shrinkage, and structural cracks
• Construction (cold), isolation and expansion joints
• Interfaces of (M/E/P), mechanical, electrical, and plumbing penetrations
• Honeycombs, and similar locations of poor consolidation

In well consolidated, normal weight concrete, high pH components within the cement/gel paste, accumulate around and react with iron on the steel surface to resist corrosion from actively occurring. This is called “passivation”. However, concrete cracking due to high stress and associated strain defects in the element allows leakage and lateral migration of water and effectively introduce all of the necessary components — oxygen, water, and an electrolyte — needed for uncontrolled corrosion of steel reinforcement. Groundwater leakage through concrete continues to bring water with dissolved oxygen and enhances the electrolytic environment; further saltwater exacerbates the problem dramatically.