Friday, June 10, 2011

A short-hand cement chemistry notation: CS · Cs · Cc · H15 for thaumasite

CS · Cs · Cc · H15 is a widely used short-hand notation for the mineral thaumasite [1]. In this notation, symbols CS, Cs, Cc and H15 represent the four components calcium silicate, calcium sulfate, calcium carbonate and hydrate (water), respectively, as they occur in the formula of thaumasite's chemical composition:  CaSiO3 · CaSO3 · CaCO3 · 15H2O. Another common formula presentation is [Ca3Si(OH)6·12H2O)](SO4)(CO3). Information snippets regarding thaumasite and various references can be found at Materials Matter! : Ca3Si(OH)6(CO3)(SO4)(H2O)12.

This special notation is for use within its domain of interest: chemistry and technology of building materials and composites. Notice that the symbols C, H, S and Cs conflict with their use to represent the chemical elements carbon, hydrogen, sulfur and cesium (caesium): non-supervised parsing software may run into problems encountering this string.

Thaumasite is a naturally occurring mineral, but most of the research and public interest derives from its role (along with ettringite) as a deterioration product of concrete and mortar in a sulfate- and carbonate-rich environment.

Keywords: materials science, mineralogy, engineering, safety of buildings, damage, nomenclature, material formula

[1] Milan Drábik: Thaumasite: Its Relevance to Sulphate Corrosion in Concrete. Nachrichten aus der Chemie May 2011, 59, VIII-X.
DOI: 10.1002/nadc.201180415.

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