The Stain on the Ceiling: Cement, Concrete and Why Structures Fail

Deep End Era. Engineering with Sankalp · Oct 28, 2026 · 57m

A rust stain spreads across a garage ceiling beneath a seaside apartment block, and the residents have read about Surfside. Episode one hundred and ninety two explains concrete from the inside: how cement is made and why it emits so much carbon dioxide, how it hardens, why it needs steel, and how water, carbon dioxide and salt slowly undo it, with the hard lessons of Ronan Point, Sampoong, Genoa and Champlain Towers South. Benedikt and his garage are fictional; everything else is sourced in the fact-check log. Builds on the structural engineering and building codes episodes.

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