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Table 1 Chemical compositions of Portland cement type I and fly ash.

From: Utilization of Recycled Aggregate Concrete for Marine Site Based on 7-Year Field Monitoring

Chemical composition (%) Sample
Portland cement type I Fly ash
Silicon Dioxide, SiO2 21.52 36.02
Aluminum Oxide, Al2O3 3.56 20.58
Iron Oxide, Fe2O3 4.51 15.91
Calcium Oxide, CaO 66.70 18.75
Magnesium Oxide, MgO 1.06 -
Sodium Oxide, Na2O 0.12 0.69
Potassium oxide, K2O 0.24 1.69
Sulfur trioxide, SO3 2.11 2.24
Loss On Ignition, LOI 1.74 0.07