Enhancing the physical performance of concrete containing construction and demolition waste against the effects of accelerated carbonation and chloride ingression

The proper management of construction and demolition waste (CDW) from the construction industry is an issue that has gained relevance over the last years and, in this context, research on the potential of using CDW in concrete construction has stood out. This work analysed the durability of concrete with CDW when exposed to aggressive agents. Prismatic and cylindrical samples were prepared using four mixtures: one reference (R) and three with 15%, 25%, and 50% of CDW, respectively. The experimental campaign included the measurement of the corrosion potential, compressive strength, water absorption by capillarity and immersion, and X-ray diffraction test. The results showed that the mixture with 50% CDW presented 16% higher compressive strength than the reference concrete. The mixtures with 25% and 50% CDW presented better results in the corrosion potential tests by the penetration of chloride ions. The results of the acceleration test of CO₂, at the end of 28 days of exposure, showed that only the mixture with 50% CDW presented higher electronegative corrosion potential, -369.74 mV, and 9 mm of carbonation depth.