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New PDF release: Cement Chemistry, second edition

By H. F. W., Taylor

ISBN-10: 0727725920

ISBN-13: 9780727725929

H F W Taylor was once for a few years Professor of Inorganic Chemistry at he collage of Aberdeen, Scotland. when you consider that 1948, his major examine curiosity has been the chemistry of cement. His early paintings laid the principles of our realizing of the constitution on the nanometre point of C-S-H, the significant product shaped whilst cement is blended with water, and the only more often than not reponsible for its hardening. next reviews took him into many extra features of the chemistry and fabrics technological know-how of cement and urban. His paintings has been well-known by means of Fellowships and through different honours and awards.

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Additional resources for Cement Chemistry, second edition

Example text

On further increase in temperature, the water is lost again, until by the melting point in the region of 1400°C the material is almost anhydrous. The sorbed water affects the cell parameter and refractive index. There was early disagreement as to the direction of the variations, but it appears established that Ci 2 A 7 H has the smaller cell parameter and higher refractive index, Jeevaratnam et al (J3) finding a=l-1983nm, n= 1-611 and Dx = 2680kgm~ 3 for C 12 A 7 and a= 1-1977, n= 1-620 and Dx = 2716kgm~ 3 for Ci 2 A 7 H.

For bulk compositions in the Ca 2 (Al x Fei_ x ) 2 O5 series, the liquid is of higher Al/Fe ratio than the ferrite phase with which it is in equilibrium; the crystals that are initially deposited on cooling such a liquid therefore have a lower Al/Fe ratio than the bulk composition of the mix. On further cooling, the Al/Fe ratio of the material deposited progressively increases. Equilibrium within the ferrite crystals is difficult to attain, causing them to remain zoned, with cores richer in Fe 3+ and outer regions richer in Al 3+ than the mean composition.

A-C 2 S has been assumed to resemble nagelschmidtite (Ca 7 Si 2 P 2 O 16 ), but the unit cell of the latter seems to be more complex (Gl). 1 Crystal structure: cubic, orthorhombic and monoclinic modifications Pure C3A does not exhibit polymorphism. It is cubic, with a = 1-5263 nm, space group Pa3 and Z = 24; the structure is built from Ca 2+ ions and rings of six A1O4 tetrahedra, of formula Al6O}jj~ (Ml7). These rings are highly puckered, such that the Al atoms lie near to six of the corners of a cube (Fig.

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Cement Chemistry, second edition by H. F. W., Taylor

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