Text Box: Table 7 Mean values for OPC and fly ash properties used in High Marnham project PROPERTY OPC FLY ASH SiO2 (%) 20.8 46.7   Al2O3 (%)   7.2   27.8   Fe2O3 (%)   3.3   9.5   CaO (%)   61.7   7.1   MgO (%)   2.3   3.8   Na2O (%)   0.9   0.9   K2O (%)   0.5   0.6   SO3 (%)   1.70   1.24   Loss on Ignition (%)   1.6   2.5   Specific surface [Blaine] (cm2/g)   2250   3260   “Fineness” (% retained on 90mm)   4.6   12.3   Soundness (mm)   3.1   -   Particle density (g/cm3)   -   2.03