Concrete: Why Roman Buildings Outlive Ours

The Pantheon's concrete dome in Rome has stood for almost 2,000 years — with no steel inside at all. Some modern concrete bridges start cracking after just a few decades. Why did the Romans do it better? In this video, we follow concrete from rock to skyscraper — and explain what really happens at every step: 🪨 Cement vs. concrete: they're not the same thing 🔥 The rotating kiln: turning limestone into cement at around 1,450 °C 🚛 Why a concrete truck can never stop spinning ⚠️ The hidden danger of wet cement ❌ Myth busted: concrete doesn't dry — it can even harden underwater 🔩 Rebar: the steel that built the modern world… and slowly destroys it 🏛 The Roman secret: concrete that may heal its own cracks 🌍 The honest cost: about 8% of the world's CO₂ emissions We don't just show the pour — we explain the chemistry behind it, check the numbers, and tell you the honest story. 📊 Sources: MIT News (2023) on self-healing Roman concrete; Chatham House, "Making Concrete Change" (2018) Watch next: From Mud to Mug — how clay becomes ceramic 👉 [link] Would you trust a building made of Roman concrete? Tell us in the comments. Subscribe to Made, Explained for more processes — explained. #Concrete #RomanConcrete #HowItsMade #Engineering #Construction