Cement chemical notation

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The cement-chemical notation , also known as cement-chemical or construction-chemical shorthand , is a shortened notation for chemical compounds that is used in cement and construction chemistry . It is mainly used in the field of inorganic binders , which include cement , gypsum and lime , among others .

The purpose of the notation is to provide a simplified, clear representation of sum formulas and reaction equations , which are often required, but are unwieldy for everyday use due to their length. The abbreviations and their connections must not be confused with the element symbols from the periodic table of the elements . The short notation is therefore mostly only used if a mix-up is impossible or a different font is used that distinguishes the short characters from the usual element symbols.

Abbreviation

The most common abbreviations are listed below.

Abbreviation complete molecular formula designation
A. Al 2 O 3 Alumina
C. CaO Calcium oxide ("quicklime")
H H 2 O water
F. Fe 2 O 3 Iron (III) oxide ("rust")
M. MgO Magnesium oxide , also known as periclase
S. SiO 2 Silicon dioxide
CH Ca (OH) 2 Calcium hydroxide ("slaked lime")
Cs CaSO 4 Calcium sulfate

Further abbreviations in construction chemistry are:

Abbreviation complete molecular formula Name / note
C. CO 2 carbon dioxide
K K 2 O Potassium oxide
N Na 2 O Sodium oxide
T TiO 2 Titanium dioxide
n NO 2 Nitrogen dioxide
p PO 3 Phosphorus trioxide
s SO 3 Sulfur trioxide , often together with other compounds, see Cs

Examples of usage

As with the usual IUPAC total formula notation, the multiple occurrence of a partial connection is noted by a subscript for connections in the short notation. Often separators or spaces are omitted within the short notation. Reaction equations can also be represented in a correspondingly simplified manner using the abbreviations.

Shorthand complete molecular formula Name / description
C 3 S 3CaO · SiO 2 Tricalcium silicate ( cement clinker phase , " Alit ")
C 2 S 2CaO · SiO 2 Dicalcium silicate (cement clinker phase, " Belit ")
C 3 A 3CaO · Al 2 O 3 Tricalcium aluminate (cement clinker phase, "aluminate phase")
C 4 AF 4CaO · Al 2 O 3 · Fe 2 O 3 Calcium aluminate ferrite (cement clinker phase, "ferrite phase")
CsH 2 CaSO 4 · 2H 2 O plaster
C C CaCO 3 Calcium carbonate (" limestone ")
C 3 S 2 H 3 3CaO • 2SiO 2 • 3H 2 O Calcium silicate hydrate ( "CSH fibers", generated during hardening of concrete)
Reaction equation in short form complete reaction equation with empirical formulas description
CH + C + H → C C + 2H Ca (OH) 2 + CO 2 + H 2 O → CaCO 3 + 2H 2 O Carbonation of concrete, reaction of calcium hydroxide in concrete with carbon dioxide in the ambient air to form calcium carbonate

Remarks

  1. a b Actually already a combination of two abbreviations. Due to the frequent use, however, it is often viewed as a separate abbreviation.

Individual evidence

  1. a b Roland Benedix: Construction Chemistry . Introduction to chemistry for civil engineers. 3. Edition. Teubner, Wiesbaden 2006, ISBN 3-519-20226-3 , pp. 311 .