The influence of relative humidity on structural and chemical changes during carbonation of hydraulic lime

El-Turki, A; Ball, R J; Allen, G C

doi:10.1016/j.cemconres.2007.05.002

Title: The influence of relative humidity on structural and chemical changes during carbonation of hydraulic lime

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Abstract

Studies monitoring the carbonation of NHL3.5 hydraulic lime are described. Weight-gain measurements, focused ion beam imaging, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy were used to monitor changes in structure and composition occurring in lime pastes after exposure to 100% carbon dioxide at relative humidities of 65 and 97%. Lime paste exposed to a relative humidity (R.H.) of 97% indicated a higher carbonation rate compared to paste exposed to 65% R.H. Surface analysis showed that the sample exposed to a relative humidity of 97% was completely carbonated. No calcium hydroxide was detected. A small amount of calcium hydroxide was, however, present at the surface of the sample exposed to 65% R.H. These observations suggest that high humidity results in the formation of a thin layer of crystalline calcium carbonate covering silicate and hydroxide phases. The actual mass increase of the sample also indicated that uncarbonated calcium hydroxide remained beneath the surface.

Authors:: El-Turki, A; Ball, R J; Allen, G C

Publication Date:: Wed Aug 15 00:00:00 EDT 2007

OSTI Identifier:: 21033060

Resource Type:: Journal Article

Journal Name:: Cement and Concrete Research

Additional Journal Information:: Journal Volume: 37; Journal Issue: 8; Other Information: DOI: 10.1016/j.cemconres.2007.05.002; PII: S0008-8846(07)00119-6; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0008-8846

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; CALCIUM CARBONATES; CALCIUM HYDROXIDES; CARBON DIOXIDE; CLAYS; HUMIDITY; ION BEAMS; LIMESTONE; MONITORING; MORTARS; RAMAN SPECTROSCOPY; SILICATES; SURFACES; THIN FILMS; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY

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                    El-Turki, A, Ball, R J, and Allen, G C. The influence of relative humidity on structural and chemical changes during carbonation of hydraulic lime.  United States: N. p., 2007. 
        Web.  doi:10.1016/j.cemconres.2007.05.002.

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                    El-Turki, A, Ball, R J, & Allen, G C. The influence of relative humidity on structural and chemical changes during carbonation of hydraulic lime.  United States.  https://doi.org/10.1016/j.cemconres.2007.05.002

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                    El-Turki, A, Ball, R J, and Allen, G C. 2007.  
        "The influence of relative humidity on structural and chemical changes during carbonation of hydraulic lime".  United States.  https://doi.org/10.1016/j.cemconres.2007.05.002.

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@article{osti_21033060,

  title        = {The influence of relative humidity on structural and chemical changes during carbonation of hydraulic lime},

  author       = {El-Turki, A and Ball, R J and Allen, G C},

  abstractNote = {Studies monitoring the carbonation of NHL3.5 hydraulic lime are described. Weight-gain measurements, focused ion beam imaging, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy were used to monitor changes in structure and composition occurring in lime pastes after exposure to 100% carbon dioxide at relative humidities of 65 and 97%. Lime paste exposed to a relative humidity (R.H.) of 97% indicated a higher carbonation rate compared to paste exposed to 65% R.H. Surface analysis showed that the sample exposed to a relative humidity of 97% was completely carbonated. No calcium hydroxide was detected. A small amount of calcium hydroxide was, however, present at the surface of the sample exposed to 65% R.H. These observations suggest that high humidity results in the formation of a thin layer of crystalline calcium carbonate covering silicate and hydroxide phases. The actual mass increase of the sample also indicated that uncarbonated calcium hydroxide remained beneath the surface.},

  doi          = {10.1016/j.cemconres.2007.05.002},

  url          = {https://www.osti.gov/biblio/21033060},
  journal      = {Cement and Concrete Research},

  issn         = {0008-8846},

  number       = 8,

  volume       = 37,

  place        = {United States},

  year         = {Wed Aug 15 00:00:00 EDT 2007},

  month        = {Wed Aug 15 00:00:00 EDT 2007}

}

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https://doi.org/10.1016/j.cemconres.2007.05.002

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