Photomicrographs of Alite

Photograph 7-15 Euhedral to subhedral, zoned, yellowish tan alite dark, round belite with typical multidirectional lamellae and a well-differentiated matrix of aluminate (C3A) and ferrite (C AF). Small belite inclusions in alite. Epoxy-filled pore at bottom of photo. Coal-fired kiln, wet-process, 1000 tons/day, 38 MPa coarse seashell feed (30% greater than 75 pm). (S A6635) 

Photograph 7-16 Euhedral blue and reddish brown alite round, brown belite with multidirectional lamellae well-differentiated, very finely microcrystalline matrix of aluminate and ferrite. Moderately high maximum temperature, long burning time, moderately slow heating rate, moderately rapidly cooled. Coal-fired, wet-process kiln, 1000 tons/day. Clamshell, clay, iron-ore feed. (S A6636) 

Photograph 7-18 Clinker thin section (approximately 15 pm thick) showing relatively large angular alite smaller, round belite and normal ferrite with its short slender intersecting crystals, between which the aluminate occurs (not visible at this magnification). (S A6638) 

Transmitted, plane-polarized light Field dimensions = 0.21x0.21 mm 

Photograph 7-19 Same field of view as previous photograph except in partially crossed polars. Various interference colors due, in large part, to different crystallographic orientations. (S A6639) 

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