New PDF release: Cement Chemistry

By Ian Richardson, H F W Taylor

ISBN-10: 0727725920

ISBN-13: 9780727725929

H F W Taylor used to be for a few years Professor of Inorganic Chemistry at he college of Aberdeen, Scotland. due to the fact that 1948, his major study curiosity has been the chemistry of cement. His early paintings laid the rules of our figuring out of the constitution on the nanometre point of C-S-H, the vital product shaped while cement is blended with water, and the single typically reponsible for its hardening. next reports took him into many extra points of the chemistry and fabrics technology of cement and urban. His paintings has been famous by way of Fellowships and via different honours and awards.

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Ono et al. (Ol) and Yamaguchi and Takagi (Yl) give further data on the optical properties of clinker belites. Guinier and Regourd (Gl) summarized the thermal behaviour of C2S polymorphs. On heating, /3-C2S shows endotherms beginning at 693°C and 1450°C, due respectively to the (5 —> a'L and a'H —• a transitions; with 7-C2S, the 693°C endotherm is replaced by a broad one beginning at about 748°C due to the transition to a'L. The curve obtained on cooling a-C 2 S from 1500°C shows exotherms beginning at about 1456°C, 682°C and 530°C, due respectively to the a->a'H, afL —> j3 and (3 -> 7 transitions.

12 Portland cement and its major constituent phases easy or even practicable to identify the polymorph or polymorphs in a clinker by the XRD powder pattern alone. The patterns differ principally in the fine structures of certain peaks (B2,G1,J1,M4,M5,R1). 3 shows characteristic portions of the patterns of Ti C3S and of some clinkers. Mi alite, as present in clinkers, probably always has the maximum MgO content possible for this polymorph, and as such has a unit cell or pseudocell that is geometrically almost hexagonal.

Yamaguchi and Takagi (Yl) summarized data showing that incorporation of Mg 2+ or Si 4+ or both causes increases in cell parameters. Boikova (B2) determined the cell parameters of four preparations with compositions similar to those of typical clinker ferrites; the ranges were a = 0-5535-0-5554 nm, b = 1 -4492-1 -4642 nm, c = 0-5288-0-5333 nm. Marinho and Glasser (M23) found that Ti 4+ substitution caused stacking changes in C 2 F or C 4 AF. It had negligible effect on the cell parameters and the charge was balanced by incorporation of additional oxygen atoms.

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Cement Chemistry by Ian Richardson, H F W Taylor


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