Black plaque № 13221

San Antonio, TX, United States

Alamo Portland and Roman Cement Company. Near this site in 1879, Englishman William Loyd discovered a blue argillaceous limestone believed to be a natural cement rock. Analysis by San Antonio druggist and chemist George H. Kalteyer confirmed the rock contained proper proportions of lime and clay to

produce portland cement. Loyd and Kalteyer, along with other investors, organized the Alamo Portland and Roman Cement Company, which was chartered in January 1880. This, the first portland cement plan

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