Chemical Composition Of Rice Husk Ash February 5, 2020 6:12 am Byadmin InUncategorized 0 Facebook Twitter Google+ Chemical composition Rice husk ash Cement type Fly ash SiO2 (%) 93.0 20.2 42.1 Al2O3 (%) 0.17 5.40 21.0 Fe2O3 (%) 0.35 2.90 7.12 SiO2 + Al2O3 + Fe2O3 (%) 93.5 28.5 70.2 SO3 (%) 0.11 2.30 0.70 CaO (%) 0.91 63.8 14.8 MgO (%) 0.42 1.50 2.00 Na2O (%) 0.63 2.72 0–2 K2O (%) 2.82 0.30 0–5 LOI 4.70 2.00 7.31