Effects of sulfate during CO2 attack on portland cement and their impacts on mechanical properties under geologic CO2 sequestration conditions

Qingyun Li, Yun Mook Lim, Young Shin Jun

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

To investigate the effects of sulfate on CO2 attack on wellbore cement (i.e., chemical and mechanical alterations) during geologic CO2 sequestration (GCS), we reacted cement samples in brine with 0.05 M sulfate and 0.4 M NaCl at 95 °C under 100 bar of either N2 or supercritical CO2. The results were compared to those obtained from systems without additional sulfate at the same temperature, pressure, salinity, and initial brine pHs. After 10 reaction days, chemical analyses using scanning electron microscopy with a backscattered electron detector (SEM-BSE) and inductively coupled plasma optical emission spectrometry (ICP-OES) showed that the CO2 attack in the presence of additional sulfate was much less severe than that in the system without additional sulfate. The results from three-point bending tests also indicated that sulfate significantly mitigated the deterioration of the cement's strength and elastic modulus. In all our systems, typical sulfate attacks on cement via formation of ettringite were not observed. The protective effects of sulfate on cement against CO2 attack resulted from sulfate adsorption, coating of CaSO4 on the CaCO3 grains in the carbonated layer, or both, which inhibited dissolution of CaCO3. Findings from this study provide new, important information for understanding the integrity of wellbores at GCS sites and thus promote safer GCS operations.

Original languageEnglish
Pages (from-to)7032-7041
Number of pages10
JournalEnvironmental Science and Technology
Volume49
Issue number11
DOIs
Publication statusPublished - 2015 Jun 2

Fingerprint

carbon sequestration
Sulfates
mechanical property
sulfate
Mechanical properties
brine
scanning electron microscopy
bovine spongiform encephalopathy
effect
chemical
Scanning electron microscopy
Bending tests
Inductively coupled plasma
elastic modulus
Spectrometry
spectrometry
Deterioration
coating
Cements
Dissolution

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

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title = "Effects of sulfate during CO2 attack on portland cement and their impacts on mechanical properties under geologic CO2 sequestration conditions",
abstract = "To investigate the effects of sulfate on CO2 attack on wellbore cement (i.e., chemical and mechanical alterations) during geologic CO2 sequestration (GCS), we reacted cement samples in brine with 0.05 M sulfate and 0.4 M NaCl at 95 °C under 100 bar of either N2 or supercritical CO2. The results were compared to those obtained from systems without additional sulfate at the same temperature, pressure, salinity, and initial brine pHs. After 10 reaction days, chemical analyses using scanning electron microscopy with a backscattered electron detector (SEM-BSE) and inductively coupled plasma optical emission spectrometry (ICP-OES) showed that the CO2 attack in the presence of additional sulfate was much less severe than that in the system without additional sulfate. The results from three-point bending tests also indicated that sulfate significantly mitigated the deterioration of the cement's strength and elastic modulus. In all our systems, typical sulfate attacks on cement via formation of ettringite were not observed. The protective effects of sulfate on cement against CO2 attack resulted from sulfate adsorption, coating of CaSO4 on the CaCO3 grains in the carbonated layer, or both, which inhibited dissolution of CaCO3. Findings from this study provide new, important information for understanding the integrity of wellbores at GCS sites and thus promote safer GCS operations.",
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Effects of sulfate during CO2 attack on portland cement and their impacts on mechanical properties under geologic CO2 sequestration conditions. / Li, Qingyun; Lim, Yun Mook; Jun, Young Shin.

In: Environmental Science and Technology, Vol. 49, No. 11, 02.06.2015, p. 7032-7041.

Research output: Contribution to journalArticle

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