[sup 29]Si solid state NMR study of tricalcium silicate and cement hydration at high temperature

• Published in: Cement and concrete research 1993-09, Vol.23:5
• Main Authors: Masse, S., Zanni, H., Lecourtier, J., Roussel, J.C., Rivereau, A.
• Format: Article
• Language: English
• Subjects: 400201 - Chemical & Physicochemical Properties; ALKALINE EARTH METAL COMPOUNDS; BUILDING MATERIALS; CALCIUM COMPOUNDS; CALCIUM SILICATES; CEMENTING; CEMENTS; EVEN-ODD NUCLEI; HYDRATION; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ISOTOPES; LIGHT NUCLEI; MAGNETIC RESONANCE; MATERIALS; NUCLEAR MAGNETIC RESONANCE; NUCLEI; OIL WELLS; OXYGEN COMPOUNDS; PORTLAND CEMENT; RESONANCE; SILICATES; SILICON 29; SILICON COMPOUNDS; SILICON ISOTOPES; SOLVATION; STABLE ISOTOPES; TEMPERATURE DEPENDENCE; WELLS
• ISSN: 0008-8846; 1873-3948
• DOI: 10.1016/0008-8846(93)90177-B

Oilwell cementing involves the placement of a cement slurry in the annulus between the metal casing and the geological formation. Its principal functions are to isolate the different zones within the wellbore and to support the casing at each stage of drilling. [sup 29]Si high resolution solid state NMR has been used to follow the hydration kinetics of class G Portland cement and of its major component: tricalcium silicate Ca[sub 3]SiO[sub 5] (C[sub 3]S). Samples were hydrothermally synthesized at temperatures between 60 and 120C; hydration was stopped at selected reaction times, from 30 minutes to 14 days, by the acetone-ether method of water-removing. [sup 29]Si NMR spectra of hydrates clearly show that, in silicate chains, the ratio between the silicon atoms of end groups and those of middle groups depends not only on the time of hydration, but also on the synthesis temperature.