Concrete • Movement • Flexibility • Crack Repair
A crack is visible evidence that concrete has moved.
Filling the opening may restore the surface, but if the forces that created or continue to move the crack remain present, the repair material may be asked to accommodate that movement again.
Understanding the movement is therefore just as important as filling the crack.
CONCRETE ISN’T STATIC
Concrete may appear rigid and motionless, but it responds continuously to its environment.
Temperature changes can cause expansion and contraction.
Moisture conditions can change dimensions.
Equipment can introduce vibration.
Traffic and structural loads can introduce stress.
Buildings and slabs themselves can experience movement.
The amount may be small, but the forces generated can be significant.
CRACKS CONCENTRATE MOVEMENT
Once concrete has cracked, movement can become concentrated along that existing opening.
As conditions change, the crack may widen, narrow or shift.
A repair placed inside that opening becomes part of this moving interface.
The question is no longer simply:
Can we fill the crack?
The better question is:
What will happen when the crack moves again?
RIGID REPAIRS RESIST MOVEMENT
A rigid repair material can create a strong connection across a stationary crack.
But when movement exceeds what the repair or surrounding substrate can accommodate, stress concentrates somewhere in the system.
Understanding the expected movement therefore becomes critical when selecting a repair approach.
FLEXIBILITY CAN MANAGE MOVEMENT
Flexible repair materials approach the problem differently.
Rather than attempting to prevent all movement, the material can deform as the surrounding substrate expands, contracts or vibrates.
That ability allows the repair to accommodate movement while maintaining contact with the adjoining surfaces within the material’s designed capabilities.
DIFFERENT CRACKS REQUIRE DIFFERENT SOLUTIONS
Not every crack is moving.
Not every moving crack moves the same amount.
Some cracks may be dormant.
Others may respond to temperature.
Some may indicate structural conditions that require evaluation before any repair material is selected.
The repair should match the condition.
Understand the crack before choosing what goes into it.
A CRACK CAN BE FILLED. MOVEMENT HAS TO BE MANAGED.
Successful crack repair begins by looking beyond the opening itself.
What caused it?
Is it still moving?
How much movement should the repair accommodate?
What environmental conditions will it experience?
Once those questions are understood, the repair material can be selected around the real condition rather than simply the visible crack.
Don’t just repair what you see. Engineer for what the substrate does.