Skip to main content

Table 1 Chemical composition of Portland cements and fly ashes.

From: Improvement of High-Volume Fly Ash Cementitious Material Using Single Alkali Activation

Chemical composition (%) Portland cement Type I Fly ash
Silicon dioxide, SiO2 20.10 35.20
Aluminum oxide, Al2O3 5.20 19.20
Iron oxide, Fe2O3 3.15 17.81
Calcium oxide, CaO 60.24 16.65
Magnesium oxide, MgO 1.13
Sodium oxide, Na2O 0.11 0.63
Potassium oxide, K2O 0.43 2.44
Sulfur trioxide, SO3 2.42 1.50
LOI 2.03 0.15