Figure 7.
(A) X-ray diffraction patterns of the set cements after setting. (B) Scanning electron micrographs of fracture surfaces of (i) MgPO4, (ii) CaSO4, (iii) monetite, (iv) brushite. Calcium sulphate and brushite had similar microstructures whose cementitious matrix was made up of at least one population of platy crystals up to ~5 µm in dimension, whereas monetite and magnesium phosphate were more crystalline with rhomboid crystals >10 µm in dimension. (C) Mercury porosimetry showed the modal pore sizes lay in the range ¼ to 5 µm.