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Concrete Remediation

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Common concrete issues requiring remediation:

  • Dusting

    • Concrete dusting is a loose powder that forms on the top of a hardened concrete surface, as the concrete disintegrates.
    • Concrete breaks down from normal traffic due to a weakness in the surface. This weakness is caused by various factors including carbonation, insufficient curing and incorrect trawling.
    • ColorBlast treats concrete dusting by cleaning the surface with a high pressure cleaner to prep the surface for the treatment. This is followed by a liquid penetrating treatment that reacts with the calcium in the concrete halting the concrete deterioration process.

  • Spalling/Concrete Cancer

    • Spalling is the deterioration of steel reinforced concrete, often appearing as cracks, and red rust. In some situations whole sections of concrete can delaminate and fall away from the reinforcing steel work. Spalling is often referred to as concrete cancer, as the problem is not obvious initially. As the problem increases, the treatment becomes more difficult and costly. Concrete spalling, if left untreated, can progress, becoming much worse, and can cause the concrete structure to become unstable.
    • The most common cause of concrete spalling is carbonation. This is a chemical reaction between the carbon dioxide(CO2) in the air and the calcium in the concrete, causing the steel reinforcing to corrode. As the steel reinforcing corrodes, it can expand up to ten times its original volume exerting stress on the concrete around it.
    • Treating concrete spalling depends on the extent of the damage, and can range from surface reconstruction to simply a liquid applied penetrating sealer.

  • Cracking

    • Concrete cracking, isn't aesthetically pleasing, and can be the result of various circumstances. Common types of concrete cracks are, shrinkage cracks, expansion cracks, settlement cracks, heaving cracks and excessive weight cracks. Concrete cracks allow contaminates to penetrate the concrete, allowing for faster deterioration.
    • Treating concrete cracks is determined by the extent, and type of the cracking. The process begins by correctly preparing the affected area, filling the crack with the correct product, followed by a concrete treatment that reacts with the calcium in the concrete to prevent further cracking from happening.

  • Carbonation

    • Concrete carbonation is a complex physical and chemical reaction between hydration products of cements and CO2.
    • Concrete carbonation easily induces a decrease of the system pH, decomposition of hydration products, depassivation of deactivated film of reinforcing bar and cracking of the concrete cover. Therefore, concrete carbonation is a serious problem for the durability of concrete structures.
    • To stop the carbonation, we need to eliminate the moisture movement within the structure. We use a spray applied concrete treatment that reactively progresses through the concrete structure, forming a hydrogel that blocks the pores in the concrete.

  • Chloride Attack

    • Chlorides are reactive chemicals which enter the concrete via the movement of moisture in and out of the capillary pores. Chlorides are typically found in salt water, putting marine structures at a higher risk.
    • The mixture of chlorides and oxygen reach the embedded steel causing electrochemical corrosion in the rebar. This reaction will cause the concrete to break down at a faster rate then planned for.
    • To halt the chloride attack from progressing in the structure, we must prevent the movement of moisture within the structure itself. To do this we use a concrete treatment system that penetrates the concrete pores, deals with the moisture within the structure, and prevents outside moisture from entering.

  • Internal reinforcement corrosion

    • Corrosion of steel reinforcement is the leading cause of deterioration in concrete structures. As the steel embedded in the concrete corrodes, it expands causing damage to the concrete structure.
    • Moisture travelling in and out of the capillary pores in the concrete draw in contaminates which cause the steel reinforcing to corrode within the structure.
    • To prevent the corrosion from progressing, we must apply a concrete treatment that enters the pores, reacts with the calcium causing a hydrogel, this blocks moisture from entering the concrete structure, and deals with the moisture within the structure. The hydrogel on its own is not always the complete solution to the situation, in cases where the corrosion has advanced, and the structure has deteriorated significantly, then other methods will be needed to repair the structure before the treating can take place.

  • Water Ingress

    • Water ingress is a particularly common problem in basements and underground carparking.
    • As the groundwater puts gravitational pressure on the structure from the water table on the outside of the structure, water finds its way into the structure via any small crack.
    • With water ingress we use a concrete treatment system that eliminates the problem from the negative side. The system works its way through the concrete halting the groundwater from seeping into the structure.

A WORD FROM OUR CUSTOMERS 

ColorBlast were great to deal with from the first phone call. They were reassuringly professional in their approach and knowledge of the work required. The cost was very reasonable compared to two other quotes from general house painters. The finish is excellent, and we are very pleased.

- MICHAEL CURLEY

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