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By H. F. W., Taylor

H F W Taylor used to be for a few years Professor of Inorganic Chemistry at he college of Aberdeen, Scotland. in view that 1948, his major learn curiosity has been the chemistry of cement. His early paintings laid the principles of our knowing of the constitution on the nanometre point of C-S-H, the primary product shaped while cement is blended with water, and the only generally reponsible for its hardening. next experiences took him into many extra elements of the chemistry and fabrics technological know-how of cement and urban. His paintings has been well-known by means of Fellowships and by way of different honours and awards.

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Extra resources for Cement Chemistry, second edition

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6 Optical, thermal and other data T{ C3S is biaxial with ( - ) 2 K = 20-60°, and a A c h e x - 0 - 1 5 ° (Ol); the refractive indices are a = 1-7139, 7 = 1-7172 for pure C3S and a = 1-7158— 1-7197, 7 = 1-7220-1-7238 for typical clinker alites, all determined using sodium light (B5). In thin sections in polarized light, Mi and M 3 are most readily distinguished by the maximum birefringence, which is 0-005 to 0-006 for M 3 and 0-003 for Mi (M2-M5). Other differences in optical properties include the optic orientation referred to the hexagonal axes of the R form, whose shape persists through the transitions that occur on cooling, and the optic axial angle; Maki and Kato (M4) give details.

After D2, with later modifications (G12,O3, The CaO-AI2O3 system There have been many phase equilibrium studies on this system, and differences of opinion probably still exist on several points. In part, these differences arise because variations in the humidity and oxygen content of the furnace atmosphere markedly affect the phase relations for compositions in the region of Ci 2 A 7 . The phase diagram in Fig. 2 appears to provide the best description of the system modified by the presence of small amounts of water and oxygen, and thus represents the behaviour in air of ordinary humidity.

The crystal structure of 7-C2S is similar to that of olivine, (Mg,Fe)2SiO4 (Fig. 4D; M13,U4). The calcium is octahedrally coordinated. The unit cell and the arrangement of Ca 2+ and SiO^" ions show some similarities to those of the other polymorphs, but also important differences. e. in a definite crystallographic orientation relative to the starting material; Fig. 4), but fragment because of the large volume change (B7,G8,K2,U8). 7-C2S scarcely reacts with water at ordinary temperatures. 2 Polymorphic forms and textures in clinker belites XRD powder evidence shows that in the majority of clinkers the belite is predominantly or entirely of/3-C2S structure (G1,Y1), though some peaks are broadened (Gl) and the presence also of both a and a' (presumably a'h) forms has been reported (G1,O1,R1,Y1).

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