The effect of various heat treatments of the clinker on the early hydration of cement pastes
- 1 March 1964
- journal article
- Published by Thomas Telford Ltd. in Magazine of Concrete Research
- Vol. 16 (46) , 3-10
- https://doi.org/10.1680/macr.1964.16.46.3
Abstract
Summary Three commercial Portland cement clinkers (low-heat, ordinary and sulphate-resisting) were each given three different heat treatments. The hydration reactions of cements made of these clinkers were then observed by electron-optical and X-ray diffraction techniques from 4 min to 3 months. It has been found that alumina- and iron-bearing compounds in commercial clinkers have reactivities different from those of laboratory-made C3A and C4AF. Alumina- and iron-bearing compounds in commercial clinkers can be made to approach the reactivity of pure C3A and C4AF by prolonged annealing at 1,280°C. Direct evidence of “through-solution” conversion of C4AHx to ettringite has been found.Keywords
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