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Table 1 Chemical composition of RHA and WTS

From: Incorporation of untreated rice husk ash and water treatment sludge in masonry unit production

Elements Mass % in OPC Mass % in URHA Mass % in WTS
SiO2 20.4 74.4 34.6
Al2O3 6.1 24.3
K2O 0.5 5.1 3.0
CaO 65.9 3.9 3.7
Fe2O3 3.9 3.9 22.5
SO3 1.3 0.7 2.8
TiO2 0.7 0.4
MgO 0.6 0.8 1.9
LOIa 1.3 10.5 6.8
  1. aLOI Loss on ignition