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Table 1 Chemical composition of Portland cement.

From: Carbonation Model and Prediction of Polyvinyl Alcohol Fiber Concrete with Fiber Length and Content Effects

Composition SiO2 Al2O3 Fe2O3 CaO MgO R2O LOI
Content /% 20.6 5.0 3.4 63.3 1.3 0.5 1.76
  1. LOI is the loss on ignition, namely the percentage of weight lost after ignition between 1000 and 1100 °C