Rosendale cement

Rosendale cement generally refers to a type of natural cement that was produced in and around Rosendale, New York, from argillaceous limestone, but is a term that has had different definitions at different times. The fast-setting Rosendale natural cement mortars proved to be more efficient than the mortars based on lime and sand. Because of its reputation, Rosendale cement has also been used as both a trade name and as a generic term referring to natural hydraulic cements produced elsewhere. It was used in the construction of many of the United States' most important landmarks, including the Brooklyn Bridge, the pedestal of the Statue of Liberty, Federal Hall National Memorial, and one of the wings of the United States Capitol building.

Natural cement is produced in a process that begins with the calcination of crushed carbonate sedimentary rocks in kilns. The resulting clinker is ground into a fine powder before being shipped to market. Historically, this natural cement product was packaged in paper-lined wooden barrels or heavy canvas bags. Rosendale natural cement from the Rosendale area was produced from dolostone extracted from the Rosendale and Whiteport members of the Late Silurian Rondout Formation. The natural levels of magnesium and clay in the dolostone from the Rondout formation are ideally suited for cement production and required none of the chemical additives characteristic of modern Portland cement production.

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