For a maintenance engineer or construction supervisor, a crack in concrete is never just an aesthetic problem. It’s a symptom. Structural concrete pathologies can compromise the safety, functionality, and lifespan of any infrastructure if they are not diagnosed promptly and accurately.
The real challenge is not hiding the crack, but identifying the root cause and applying an engineering solution that stops the degradation.
1. Common Causes of Cracks: Identifying the Pathology
Cracks and fissures can originate at different stages of a structure’s life cycle. The most common causes include:
Plastic and Thermal Shrinkage: This occurs during curing due to rapid water evaporation or sudden temperature changes. It generates surface cracks that, while often aesthetically pleasing at first, can allow the entry of aggressive agents.
- Structural settlements: Unforeseen movements in the foundation soil or compaction failures cause tensile stresses that the concrete cannot absorb, generating deep cracks.
- Corrosion of reinforcing steel (Carbonation): When atmospheric CO₂ penetrates the concrete, it reduces its alkaline pH and exposes the steel bars. Oxidation expands the metal, causing spalling and critical longitudinal cracks.
- Mechanical overloads: Operating stresses that exceed the original design capacity of the structure, common in high-traffic areas or industrial plants.
2. Technical Diagnosis: The critical step before taking action
Applying a commercial mortar to an active crack is a costly mistake. Before any intervention, a rigorous pathological evaluation is essential:
- Activity monitoring: Determine if the crack is active (moving) or passive (stabilized) using mechanical crack gauges or crack gauges.
- Non-Destructive Testing (NDT): Use of sclerometers, ultrasound, or chemical reagents to measure the actual strength of concrete and the depth of carbonation without damaging the structure.
Specialized Engineering Solutions
Structural resin injection repairs passive cracks with epoxies; for active leaks, polyurethanes or hydro-expansive resins are used, providing an instant seal. Thixotropic R4 mortars, reinforced with fibers, replace deteriorated concrete, offering high strength, low shrinkage, and good adhesion. CFRP reinforcement addresses loss of load-bearing capacity or severely degraded steel, thanks to its high strength, low weight, and rapid installation.
These repairs require precise diagnosis, specialized personnel and equipment, and knowledge of materials chemistry.
At A&J Special Maintenance Services, we specialize in the diagnosis, evaluation, and technical repair of civil and industrial structures. We protect the value of your assets and guarantee the operational continuity of your facilities with cutting-edge engineering solutions.
Avoid temporary repairs that multiply costs in the long run.