How do capillaries make concrete weak?
How Capillaries Cause Cracks in Concrete Capillaries are subversive little agents that undermine the strength of concrete by providing air spaces for moisture invaders, making it porous. They shamelessly wick moisture from the surrounding environment and bring it to the top of the concrete slab just underneath flooring materials, enabling the water, or water vapor, when it condenses, to ravage helpless flooring adhesives.