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Back Scattered Scanning Electron Micrographs of CCU-treated ash cylinders: (Type i) - Mixed wood ash, showing relict-planty structures enveloped by massive carbonated precipitates; (Type ii)- Nut shell-derived ash cemented by interstitial carbonate; (Type iii)- Wood ash, with dispersed, discrete precipitates of carbonate. This ash was hygroscopic, displayed mircocracking and low strength (Note: Image 1 is taken at a slightly higher magnification for clarity).
