One of the most common types of deterioration that we see in concrete is known as “Spalling”. The deterioration is seen on the concrete surface but the initial decay began at the reinforcing steel. Concrete’s high alkalinity causes a thin, protective oxide film to form on the steel. Unfortunately, when sodium chloride and calcium chloride are present, along with moisture and oxygen, carbonation occurs and the protective coating breaks down. The corrosion begins! Corrosion continues to build and occupies more space inside the concrete. The force from within eventually causes cracking that is seen on the surface. This is the first symptom observed! Pieces of the concrete will begin to break away!
Problem:
{Concrete Repair}
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Allied Restoration & Caulking
Solution:
*Cracks and joint failure: Cracks and failed joints allow moisture to get inside the concrete and reach the reinforcing steel. This will begin the corrosion from within.
*Has there recently been any repair to the structure? Newly repaired steel can often cause a corrosion to occur in adjacent areas. The newly repaired steel becomes a cathode and the surrounding untreated steel functions as an anode inadvertently jumpstarting a new hot spot for corrosion. The use of a migrating corrosion inhibitor will reduce the rate of future corrosion.
*Poorly leveled or concrete that has shifted after settling will cause areas that hold surface water and the steady infiltration of moisture will speed corrosion.
*Because concrete surfaces are porous and typically exposed to wind and rain, water intrusion can occur from the surface. The use of a sealant for waterproofing will help to reduce the risk of deterioration in this manner. Other materials such as membranes and cementitious material can also be used effectively.
Diagnosis! Diagnosing the problem is key to providing the right solution. What we look for:
Understanding the underlying problem is the key to providing the solution!
