The requirements for maintaining proper concrete cover over steel rebars in a project include ensuring that the specified minimum cover thickness is met, using adequate concrete mix design, ensuring proper compaction of concrete during placement, preventing concrete segregation, using proper formwork to prevent displacement of rebars, and ensuring proper curing of the concrete to prevent cracking or corrosion of the rebars.

There are several measures taken to extend the lifespan of steel rebars in structures exposed to aggressive chemical environments. One common approach is the use of corrosion-resistant coatings or paints on the rebars, such as epoxy or zinc-based coatings. These coatings act as a barrier, preventing direct contact between the steel and the corrosive chemicals, thus slowing down the corrosion process. Another measure is the use of stainless steel rebars, which have inherent corrosion resistance due to their composition. Stainless steel rebars contain a high percentage of chromium, which forms a protective oxide layer on the surface, providing resistance against corrosion. In addition, proper concrete cover is crucial in protecting the rebars from aggressive chemicals. Adequate thickness of concrete cover acts as a physical barrier, preventing direct exposure of the rebars to the corrosive environment. Furthermore, regular maintenance and inspections play a vital role in extending the lifespan of steel rebars. Periodic cleaning, repairing any damaged coatings, and removing any accumulated debris or chemicals can help prevent corrosion and maintain the rebars' integrity. Overall, a combination of corrosion-resistant coatings, stainless steel rebars, adequate concrete cover, and regular maintenance are the key measures taken to extend the lifespan of steel rebars in structures exposed to aggressive chemical environments.

Steel rebars are used in the construction of sports stadiums and arenas to reinforce concrete structures, such as foundations, beams, and columns. These rebars provide strength, durability, and stability to withstand heavy loads and forces commonly experienced in sports venues.