China Built Glass Bridges That Survive a Sledgehammer - And They’re Already Falling Apart

China's historic construction boom shattered global engineering records, pouring more cement in three years than the United States poured in an entire century. Yet beneath viral demonstrations and futuristic architectural records, a fundamental supply chain crisis has begun quietly undermining modern infrastructure from the inside out. This investigative documentary explores the chemistry, economics, and logistics behind contemporary megaproject durability. We examine why world-class laboratory breakthroughs struggled under unprecedented building targets, how critical raw material shortages forced compromises into standard concrete mixes, and what happens when the real lifespan of massive civil engineering projects collides with commercial reality. Through technical case studies spanning municipal towers, high-speed transit networks, and reclaimed coastal developments, we analyze the hidden maintenance liabilities facing major infrastructure systems as the decades advance. This channel covers global engineering investigations, architectural analysis, and the technical realities behind modern megaprojects. Timestamps: 0:00 - Hook 0:16 - Context 1:07 - The Grand Canyon Spectacle vs Longevity 2:13 - The Historic Scale of China's Cement Pour 2:56 - A Century of US Infrastructure Surpassed in Three Years 3:34 - The Disposable City Model 4:18 - Laboratory Breakthroughs and 3D-Printing Displays 5:10 - Promotional Illusions vs Monolithic Reality 5:54 - The Vital Role of River Sand 6:42 - The Sea Sand Shortcut 7:30 - Internal Rust and Structural Self-Destruction 8:09 - Call to Action 8:20 - Timeline 1: The Shenzhen Concrete Crackdown 9:13 - Halting the Ping An Finance Centre 10:11 - Timeline 2: The Fly Ash Supply Deficit 11:14 - Substandard Ash on High-Speed Rail Tracks 11:59 - Delayed Degradation and Engagement CTA 12:51 - Timeline 3: Evergrande's Ocean Flower Island 13:58 - Eight-Year Decay in Hainan Basements 14:41 - Implications 17:44 - Outro