2026-11-08
Time-Traveler's Guide: Walls Collapse in Heavy Rain? How to Burn Modern Portland Cement from Limestone and River Clay
If you travel back to antiquity, why do mud-brick houses collapse in rainstorms while sticky-rice lime mortar takes decades to cure and dissolves underwater? Here is the complete inorganic chemistry and 1400°C shaft-kiln guide to making hydraulic Portland cement from 3 parts limestone and 1 part river clay.
