Table 5.

Surface composition of wet-stored fly ash at different pH (10% moisture, 20°C, 120 days) by EDX: % by mass

ElementDryDFA1 – pH solutionDryDFA3 – pH solution
4.0≈7.011.54.0≈7.011.5
C19.419.419.419.417.117.117.117.1
O49.844.650.046.748.842.943.846.1
Al8.28.07.47.59.28.48.77.4
Si16.317.113.315.415.716.616.815.9
K1.41.71.61.72.32.01.91.4
Ca2.03.73.93.92.14.22.13.2
Fe3.04.94.05.54.35.46.36.5
TiND0.7NDNDND0.50.7ND
MgNDND0.6NDND0.60.7ND
SNDNDNDND0.61.10.61.5
NaNDNDNDNDND1.21.31.1

ND, not detected

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