By H. F. W., Taylor
H F W Taylor was once for a few years Professor of Inorganic Chemistry at he collage of Aberdeen, Scotland. because 1948, his major study curiosity has been the chemistry of cement. His early paintings laid the principles of our figuring out of the constitution on the nanometre point of C-S-H, the important product shaped while cement is blended with water, and the only mostly reponsible for its hardening. next reviews took him into many extra elements of the chemistry and fabrics technological know-how of cement and urban. His paintings has been famous by way of Fellowships and by way of different honours and awards.
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Correlations have been reported to exist between the MgO contents of the belite and the clinker (Kl), and the Al 2 O 3 /Fe 2 O 3 ratios of the belite and the clinker (F4,H6), but there is disagreement in the case of Fe 2 O 3 (H6,K1). Early reports mention a compound KC 23 S 12 , but the K 2 O content of 3-5% corresponding to this formula is well above those found in clinker belites, and recent electron optical work indicates that the limit of K 2 O substitution is about 1-2% (Cl). Any interpretation of belite analyses is at present tentative because of the uncertainties arising from exsolution effects.
6 CaO The system CaO~C2S-C4AF. " 1395 C4AF After L4, with later modifications. 1542 C12A7 Fig. 7 The pseudosystem CaO-C2S-C' 12A7-C4AF\ showing the primary phase volume ofC3S. 1. After L4, with later modifications. 39 Cement chemistry No quaternary compounds exist in this subsystem. The tetrahedron can therefore be divided into three smaller ones representing sub-solidus compatibility assemblages for CaO-C 3 S-C 3 A-C 4 AF, C3S-C3A-C2S-C4AF and C12A7-C3A-C2S-C4AF. For clarity, these are not shown on Fig.
Calcium dialuminate (CA2) occurs in some calcium aluminate cements. It reacts only slowly with water. The formula was at one time wrongly considered to be C3A5. CA 2 is monoclinic, with a —1-28398 nm, b = 0-88624nm, c = 0-54311 nm, /3= 106-8°, space group C2/c, Z = 4, Dx — 2920 kg m~ 3 , and has a structure based on a framework of A1O4 tetrahedra, in which some oxygen atoms are shared between two, and others between three tetrahedra (B16,G13). It crystallizes as laths or rounded grains, with a = l-6178, / ?