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Additional info for Microscopical Examination and Interpretation of Portland Cement and Clinker
Example text
Stable growth is indicated by a scarcity of entrapped materials and a trend toward crystal faceting. The monoclinic M1 alite variety was thought to be a primary type (formed by nucleation from the melt) with or without inclusions; the monoclinic M3 variety was said to be a product of recrystallization, the rate of which being dependent on crystal size and temperature. Combined in the highly variable clinkering environment, the stable and unstable growth modes produce a wide variety of crystalline textures of alite.
Shaft-kiln clinker typically contains Type III belite formed after conversion from Type I (Ono, 1995). Belite crystals with an internal microstructure of lamellae arranged in a concentric hexagonal pattern are rare. 008. The 2V is 20°. Alkali belite has been said to show one set of evenly spaced parallel lamellae in polished and nital-etched section but published confirmatory microprobe data are scarce. 015, (4) sharp, clear striations, (5) coarse sandwich structure of alpha and beta forms, and (6) a surface free of ferrite phases.
Alpha dicalcium silicate, rich in sodium oxide, is isotropic (Soda, Mizukami, and Shirasaka, 1968). Coarse alpha belite, crystallized from a feldspar melt reacting with calcium oxide, is colorless and alkali-rich (Ono, 1980c). 003). 720 for nz. The alpha form can occur between lamellae of beta dicalcium silicate (Regourd and Guinier, 1974). A new hydraulic cement based on the alpha-belite polymorph, stabilized with alkalies and iron, has been patented by the Portland Cement Association (Fulvio Tang, 1996).