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Table 1 Chemical composition of the pozzolans.

From: Pozzolanic Reaction of a Biomass Waste as Mineral Addition to Cement Based Materials: Studies by Nuclear Magnetic Resonance (NMR)

Oxide (%) SF EGN before HCl treatment EGN after HCl treatment EGC before HCl treatment EGC after HCl treatement
SiO2 84.5 43.30 80.0 22.4 49.4
Al2O3 0.97 1.05 0.44 0.28 0.47
Fe2O3 2.62 1.13 0.77 0.321 0.83
CaO 2.93 5.47 1.85 3.98 10.10
Na2O 0.15 0.25 0.11 0.07
K2O 1.04 21.10 7.05 53.9 8.60
MgO 0.60 6.25 1.11 3.94 4.22
SO3 2.01 0.65 2.3 0.47
P2O5 2.41 0.56 4.06 9.91
Cl 7.40 0.95 8.44 0.46
LOI 7.53 9.01 6.31 n.d. 14.6
  1. SF silica fume, EGC Cameroon elephant grass, n.d. non determined, EGN Napier elephant grass, LOI loss on ignition at 1000 °C.