Reducción de la vida útil en edificaciones de concreto: Corrosión por carbonatación, una mirada sostenible

Abstract

Abstract:Steel bar corrosion induced by concrete carbonation is critical to the service life of RC structures. The reduction in the service life of an OPC concrete house was studied, considering carbonation corrosion. The objective was to evaluate the rate of concrete carbonation. Carbonation was assessed using 1% phenolphthalein. Concrete specimens were manufactured according to experimental models PI-21-(28)DCF (6), PI-21-(28)D-R (6), PI-21-(28)D-CRR (6), PI-24-(28)D-CF (6), PI-24-(28)D-R (6), and PI-24-(28)D-CRR (6). The specimens were subjected to accelerated carbonation scenarios under 5% CO2 concentration, 70% relative humidity, and 360 hours of exposure. The penetration rate of carbonation in the concrete cover was found to be 2 mm/year for 21 MPa concrete and 1.82 mm/year for 24 MPa concrete; the lower the strength, the greater the penetration. It is reported that the reduction in the useful life of the building studied was 25 years, which was caused by concrete carbonation. The occurrence of this pathology is facilitated by: poor coatings, high w/c ratios, evasion of current regulations, harsh environmental conditions, and unskilled labor.