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Portland Cement

Oxide Analysis Formula
CaO 62.28% 0.95
MgO 2.22% 0.05
Al2O3 7.55% 0.06
SiO2 22.65% 0.32
Fe2O3 2.11% 0.01
LOI 3.20%n/a
Oxide Weight 83.09
Formula Weight 85.83

Notes

Manufactured using limestone and shale. Powder is mixed and fired in a rotary kiln to near-stoneware temperatures. The clinker is finely ground to produce a grey powder that reacts with water to form a hydrous calcium silicate with some CaO left over.

Acids do attack cement however as soluble materials are removed less reactive remaining materials are quite stable.

By Tony Hansen
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