What is carbonation of concrete?
Carbonation of concrete is a silent chemical process. It frequently degrades the structure over the years. First, carbon dioxide from the atmosphere penetrates the pores of the material. Then, it reacts with the calcium hydroxide present in the cement paste. Consequently, the pH of the concrete drops drastically. Therefore, the natural protection of the reinforcement ceases to exist.
Why does aging cause pathologies?
Concrete naturally has a highly alkaline environment. However, carbonation neutralizes this protective characteristic. Furthermore, when the pH reaches levels below nine, the steel loses its passivation. For example, in coastal regions such as those near... Barra Lighthouse, Moisture accelerates this cycle. Therefore, oxidation of the reinforcing steel becomes inevitable. Subsequently, the steel expands in volume. As a result, cracks and spalling appear in the structural covering.
What are the main structural risks?
The safety of a building depends on the integrity of the concrete. However, carbonation progresses from the outside in. Therefore, periodic inspection is essential to prevent collapses. On the other hand, older buildings are more exposed to this pathology. Furthermore, the lack of preventive maintenance aggravates the problem. Therefore, the lifespan of the property decreases considerably if the process is not contained. Moreover, corrosion reduces the effective cross-section of the reinforcement, directly affecting the load-bearing capacity of the structural element.
How to identify and diagnose it?
Technical detection requires specialized knowledge. First, we use a phenolphthalein solution to check the depth of carbonation. Then, we analyze whether the carbonation front has reached the level of the steel. In this way, we can define the precise diagnosis. However, the diagnosis alone is not enough. In addition, the engineer must assess the quality of the nominal cover. For example, insufficient cover accelerates the entire structural degradation process.
Recommended solutions and treatments
WGB Arquitetura e Engenharia offers structural rehabilitation solutions. First, we remove contaminated concrete. Then, we rigorously clean the oxidized reinforcement bars. Finally, we apply corrosion inhibitors or high-performance polymer mortars. Furthermore, surface treatment is vital to prevent further CO2 infiltration. Consequently, we protect the structure against premature aging. In this way, we ensure that the building maintains its original stability for much longer. Therefore, do not ignore signs of degradation in your property.
Does your building show cracks or signs of delamination? Preserving the structure requires specialized intervention. To understand how our specialists can diagnose and solve carbonation problems in your property, access here And speak with our technical team today.
