Effect of temperature on hydration kinetics and polymerization of tricalcium silicate in stirred suspensions of CaO-saturated solutions

Journal Article · Sat Apr 15 00:00:00 EDT 2006 · Cement and Concrete Research

DOI:https://doi.org/10.1016/J.CEMCONRES.2005.1· OSTI ID:20793281

Grant, Steven A ^[1]; Boitnott, Ginger E ^[1]; Korhonen, Charles J ^[1]; Sletten, Ronald S ^[2]

---

1. U.S. Army Engineer Research and Development Center, Cold Regions Research and Engineering Laboratory, 72 Lyme Road, Hanover, NH 03755-1290 (United States)
2. Quaternary Research Center, University of Washington, Seattle (United States)

Tricalcium silicate was hydrated at 274, 278, 283, 298, and 313 K in stirred suspensions of saturated CaO solutions under a nitrogen-gas atmosphere until the end of deceleratory period. The suspension conductivities and energy flows were measured continuously. The individual reaction rates for tricalcium silicate dissolution, calcium silicate hydrate precipitation, and calcium hydroxide precipitation were calculated from these measurements. The results suggest that the proportion of tricalcium silicate dissolved was determined by the rate of tricalcium silicate dissolution and the time to very rapid calcium hydroxide precipitation. The time to very rapid calcium hydroxide precipitation was more sensitive to changes in temperature than was the rate of tricalcium silicate dissolution, so that the proportion of tricalcium silicate hydration dissolved by the deceleratory period increased with decreasing temperature. The average chain length of the calcium silicate hydrate ascertained by magic-angle spinning nuclear magnetic resonance spectroscopy increased with increasing temperature.

• OSTI ID: 20793281
• Journal Information: Cement and Concrete Research, Vol. 36, Issue 4; Other Information: DOI: 10.1016/j.cemconres.2005.10.001; PII: S0008-8846(05)00231-0; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0008-8846
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM HYDROXIDES
CALCIUM OXIDES
CALCIUM SILICATES
CALORIMETRY
DISSOLUTION
HYDRATES
HYDRATION
NUCLEAR MAGNETIC RESONANCE
POLYMERIZATION
PRECIPITATION
REACTION KINETICS
SOLUTIONS
SPECTROSCOPY
SUSPENSIONS
TEMPERATURE RANGE 0273-0400 K