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 optimization strategy did Al-Khwarizmi employ for solving quadratic equations using geometric algebra?
• Which inaccuracy most limits celestial navigation accuracy during long 18th-century sea voyages?
• Which risk increased as 18th-century shipbuilders maximized cargo capacity in wooden hulls?
• Which structural compromise allowed Roman arch bridges to span wider gaps compared to earlier stone beam bridges?
• Which outcome occurs when chinampa agriculture experiences prolonged flooding above the root zone?
• Which structural problem emerged in large wooden sailing ships due to the 'hogging' effect?