SOME RECENT RESEARCH ON CEMENT HYDRATION
The subject of summaries presented here range from calcium hydrosilicate and the strength properties of hydrating cement paste, to the influence of sodium oxides on the reaction of C3A. The results of electron diffraction, chemical studies, d.t.a. curve, infrared spectra and structural studies of semicrystalline calcium hydrosilicate are detailed. The development of strength properties of hydrating cement pastes in their relation to structural features are described, and the hydration behavior of three calcic binders (CaSO4, 1/2H2O-CaO, Al2O3-3CaO, SiO2) in the presence of water is reviewed. New data is presented on the preacceleration stages of hydration, and a mechanism of hydration of calcium silicates in this period is set forth. The influence of Na2O (sodium oxide) on the hydration of C3A was studied by following both the hydration of solid solutions of Na2O in C3A, and the hydration of C3A in solutions of NaOH (sodium hydroxide). The relation between the composition of interstitial mass and the anomalous behavior of portland cement in the early hydration is explored, and thermodynamic considerations related to C3A hydration are discussed. Experimental investigations relating to C3A are detailed. The significance is discussed of the water:solid ratio and temperature on the physico-mechanical characteristics of hydrating CaO, Al2O3, 3CaO, Al2O3 and 4 CaO3Fe2O39 A new approach is proposed to the early hydration reaction of tricalcium silicate. The effect of gypsum on the hydration and setting of cement is discussed. The paper on"Hydration and the Cement Manufacturer", examines how hydration reactions and thereby the setting behavior and strength developments of a given clinker may change due to prehydration, carbonation or dehydration of gypsum.
- This report is a summary of contributions to a Seminar in Koge, Denmark, May 25-26, 1975.
European Cement BureauParis, France
- Publication Date: 1975
- Features: Figures; References; Tables;
- Pagination: 50 p.
- TRT Terms: Binders; Carbonation; Cement; Chemical composition; Clinkers; Concrete; Concrete curing; Experiments; Gypsum; Hydration; Manufacturing; Portland cement; Silicates; Sodium compounds; Sodium hydroxide; Thermodynamics; Water cement ratio
- Subject Areas: Highways; Materials;
- Accession Number: 00128796
- Record Type: Publication
- Files: TRIS
- Created Date: Apr 21 1976 12:00AM