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Title: Transformation of meta-stable calcium silicate hydrates to tobermorite: reaction kinetics and molecular structure from XRD and NMR spectroscopy

Journal Article · · Geochemical Transactions
 [1];  [2];  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Chemistry, Materials, Earth, and Life Sciences Directorate; DOE/OSTI
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Chemistry, Materials, Earth, and Life Sciences Directorate

Understanding the integrity of well-bore systems that are lined with Portland-based cements is critical to the successful storage of sequestered CO2 in gas and oil reservoirs. As a first step, we investigate reaction rates and mechanistic pathways for cement mineral growth in the absence of CO2 by coupling water chemistry with XRD and NMR spectroscopic data. We find that semicrystalline calcium (alumino-)silicate hydrate (Al-CSH) forms as a precursor solid to the cement mineral tobermorite. Rate constants for tobermorite growth were found to be k = 0.6 (± 0.1) × 10-5 s-1 for a solution:solid of 10:1 and 1.6 (± 0.8) × 10-4 s-1 for a solution:solid of 5:1 (batch mode; T = 150°C). This data indicates that reaction rates for tobermorite growth are faster when the solution volume is reduced by half, suggesting that rates are dependent on solution saturation and that the Gibbs free energy is the reaction driver. However, calculated solution saturation indexes for Al-CSH and tobermorite differ by less than one log unit, which is within the measured uncertainty. Based on this data, we consider both heterogeneous nucleation as the thermodynamic driver and internal restructuring as possible mechanistic pathways for growth. We also use NMR spectroscopy to characterize the site symmetry and bonding environment of Al and Si in a reacted tobermorite sample. We find two [4]Al coordination structures at δiso = 59.9 ppm and 66.3 ppm with quadrupolar product parameters (PQ) of 0.21 MHz and 0.10 MHz (± 0.08) from 27Al 3Q-MAS NMR and speculate on the Al occupancy of framework sites by probing the protonation environment of Al metal centers using 27Al{1H}CP-MAS NMR.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1626251
Journal Information:
Geochemical Transactions, Journal Name: Geochemical Transactions Journal Issue: 1 Vol. 10; ISSN 1467-4866
Publisher:
American Chemical Society, Geochemistry Div.Copyright Statement
Country of Publication:
United States
Language:
English

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Influence of aluminium on the conversion of calcium silicate hydrate gels into 11 Å tobermorite at 90°C and 120°C journal May 1975
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A new aluminium-hydrate species in hydrated Portland cements characterized by 27Al and 29Si MAS NMR spectroscopy journal January 2006
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Natural emissions of CO2 from the geosphere and their bearing on the geological storage of carbon dioxide journal July 2007
Association of dissolved aluminum with silica: Connecting molecular structure to surface reactivity using NMR journal July 2008
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Research for Deployment:  Incorporating Risk, Regulation, and Liability for Carbon Capture and Sequestration journal September 2007
Degradation of Well Cement by CO 2 under Geologic Sequestration Conditions journal July 2007
Rate of CO 2 Attack on Hydrated Class H Well Cement under Geologic Sequestration Conditions journal August 2008
Characterization of Calcium Aluminate Hydrates and Related Hydrates of Cement Pastes by 27 Al MQ-MAS NMR journal July 1998
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Aggregation-Based Crystal Growth and Microstructure Development in Natural Iron Oxyhydroxide Biomineralization Products journal August 2000
The real structure of tobermorite 11A: normal and anomalous forms, OD character and polytypic modifications [The real structure of tobermorite 11A: normal and anomalous forms, OD character and polytypic modifications] journal May 2001
Normal and anomalous tobermorites journal June 1978
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