Which mechanism primarily allowed Roman concrete structures, such as the Pantheon, to remain intact for centuries?

💡 Explanation

When exposed to water, Roman concrete's pozzolanic additives react with lime to form calcium-aluminum-silicate hydrates, creating a self-healing effect and increasing strength. Therefore, self-healing results, rather than rebar reinforcement, pre-stressing, or coating which were not primary construction methods.

• Which optical effect enabled Alhazen to accurately describe image formation in a pinhole camera obscura?
• Which effect results when ancient Andean terrace retaining walls experience increased hydrostatic pressure from saturated soil?
• Which structural weakness most likely compromised the walls of Constantinople during the 1453 siege?
• During early iron production, which outcome arose from incomplete carbon monoxide oxidation in bloomery furnaces?
• Which optical phenomenon explains how Ibn al-Haytham demonstrated light travels in straight lines using a camera obscura?
• Which outcome occurs when astrolabe plate misalignment introduces parallax error during observations?