How does concrete’s carbonation process impact outdoor trash can structural integrity?

Concrete carbonation is a chemical process where carbon dioxide from the air penetrates concrete, reacting with calcium hydroxide to form calcium carbonate. This reaction lowers the concrete's pH, typically from above 12.5 to below 9, which destroys the protective passive layer on embedded steel reinforcements. For outdoor trash cans, this leads to corrosion of the steel, causing it to expand and create internal pressure. Consequently, cracks develop in the concrete, compromising structural integrity through reduced load-bearing capacity and potential spalling. Factors like high humidity, poor concrete mix, and lack of maintenance accelerate this degradation. To mitigate impacts, use low-permeability concrete, protective coatings, and regular inspections, ensuring trash cans withstand environmental stresses for extended periods.