MMT	million metric tons
CFA	coal fly ash, also F as used in the equations
CBA	coal bottom ash, also B as used in the equations
RHA	rice hull ash, also R as used in the equations
XRF	X-ray fluorescence
XRD	X-ray diffraction
ICP	inductively-coupled plasma mass spectrometry
FTIR	Fourier transform infrared spectroscopy
SEM	scanning electron microscope
TGA-DTA	thermogravimetric analysis-differential thermal analysis
HVFA	high volume fly ash concrete
SCM	supplementary cementitious materials
OPC	ordinary Portland cement