Periclase dendritic

When examining a polished section or thin section, the viewer must constantly think in three dimensions, not merely in terms of the nearly two-dimensional view seen in the microscope. Dendritic periclase, therefore, should be considered as a three-dimensional, branching, treelike or skeletal crystal, typically growing within a liquid matrix, the surface of the section revealing only part of the tree. Alite, the most abundant phase in portland cement clinker, tends to form a somewhat discontinuous, open, three-dimensional framework of linked and stacked crys-... [Pg.29]

Total MgO content in clinker is normally maintained at less than 2.0% to avoid expansion in the autoclave test. Belite containing periclase (at an early stage of crystallization) indicates coarse grains of MgO-bearing silicates, such as diopside, pyroxene, and hornblende in the raw feed. Dendritic periclase occurs in slowly cooled clinkers from large kilns (200 t/hr) and is hardly observed in clinkers from small kilns (20 t/ hr), according to Ono (1995). [Pg.39]

Surficial deterioration of alite, amoeboid ragged belite, dendritic and lake periclase, loss of alumina brick Overturning from delayed petroleum coke, producing longer burning zone (Jefferson and Kruse, 1987)... [Pg.77]

Droplike belite in liquid phase commonly associated with dendritic periclase Excess SiOj (Hofmanner, 1973)... [Pg.86]

Dendritic periclase Rapid cooling (Hofmanner, 1973) rapid cooling from above 1400°C (Hawkins, 1979)... [Pg.113]

Dendritic periclase Relatively fast cooling from temperatures above 1500 = C, long dry kiln (DeHayes, Grady, and Vidergar, 1986)... [Pg.113]

Dendritic periclase associated with belite, also dendritic Slow cooling from high temperature and coprecipitation of phases (Hawkins and Hayden, 1976)... [Pg.113]

Photograph 7-85 Dendritic periclase forming substrate for belite overgrowth (center left). Alite crystals exhibit facial extensions into matrix of very finely microcrystalline aluminate and ferrite. Slowly cooled from high temperature. (S A6703)... [Pg.114]

Definition of species varieties and description— for example, raggedy, round, vs. dendritic varieties of belite or euhedral, large periclase vs. anhedral, or dendritic periclase state relative abundance and preferred locations of each. [Pg.164]

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