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Effect of limestone fillers on ca-leaching and carbonation of cement pastes

Quoc Tri Phung, Norbert Maes, Diederik Jacques, Geert De Schutter UGent and Guang Ye UGent (2016) KEY ENGINEERING MATERIALS. 711. p.269-276
abstract
Because of its environmental and economic benefits, part of cement is replaced by limestone fillers (LS). However, the effect of LS on the chemical degradation of cement-based materials is still unclear. In this study, accelerated leaching and carbonation were applied on cement pastes to study the effects of LS replacement on the degradation rates and microstructural alterations of degraded materials. Ammonium nitrate solution was used to accelerate the leaching process, while carbonation was speeded up by applying an elevated pressure gradient of pure CO2 on samples with 65% relative humidity. The carbonation rate was characterized by phenolphthalein carbonation depth and CO2 uptake, while leaching rate was quantified by phenolphthalein leaching depth and Ca-leached amount. Leached/carbonated samples were analyzed by a series of post-analysis techniques to characterize the microstructural and mineralogical changes. Results showed that, for a similar w/c ratio, a higher LS replacement resulted in lower leaching rate. For carbonation, LS replacement promoted the CO2 uptake despite similar carbonation depth. Furthermore, LS replacement led to less C-S-H carbonation compared to samples without LS.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
Carbonation, leaching, microstructure, limestone fillers, cement paste
journal title
KEY ENGINEERING MATERIALS
volume
711
pages
269 - 276
publisher
Trans Tech Publications
ISSN
1662-9795
DOI
10.4028/www.scientific.net/kem.711.269
language
English
UGent publication?
yes
classification
A2
copyright statement
I have transferred the copyright for this publication to the publisher
id
8533008
handle
http://hdl.handle.net/1854/LU-8533008
date created
2017-10-03 11:49:42
date last changed
2017-10-10 07:52:31
@article{8533008,
  abstract     = {Because of its environmental and economic benefits, part of cement is replaced by limestone fillers (LS). However, the effect of LS on the chemical degradation of cement-based materials is still unclear. In this study, accelerated leaching and carbonation were applied on cement pastes to study the effects of LS replacement on the degradation rates and microstructural alterations of degraded materials. Ammonium nitrate solution was used to accelerate the leaching process, while carbonation was speeded up by applying an elevated pressure gradient of pure CO2 on samples with 65\% relative humidity. The carbonation rate was characterized by phenolphthalein carbonation depth and CO2 uptake, while leaching rate was quantified by phenolphthalein leaching depth and Ca-leached amount. Leached/carbonated samples were analyzed by a series of post-analysis techniques to characterize the microstructural and mineralogical changes. Results showed that, for a similar w/c ratio, a higher LS replacement resulted in lower leaching rate. For carbonation, LS replacement promoted the CO2 uptake despite similar carbonation depth. Furthermore, LS replacement led to less C-S-H carbonation compared to samples without LS. },
  author       = {Phung, Quoc Tri and Maes, Norbert and Jacques, Diederik and De Schutter, Geert and Ye, Guang},
  issn         = {1662-9795},
  journal      = {KEY ENGINEERING MATERIALS},
  keyword      = {Carbonation,leaching,microstructure,limestone fillers,cement paste},
  language     = {eng},
  pages        = {269--276},
  publisher    = {Trans Tech Publications},
  title        = {Effect of limestone fillers on ca-leaching and carbonation of cement pastes},
  url          = {http://dx.doi.org/10.4028/www.scientific.net/kem.711.269},
  volume       = {711},
  year         = {2016},
}

Chicago
Phung, Quoc Tri, Norbert Maes, Diederik Jacques, Geert De Schutter, and Guang Ye. 2016. “Effect of Limestone Fillers on Ca-leaching and Carbonation of Cement Pastes.” Key Engineering Materials 711: 269–276.
APA
Phung, Q. T., Maes, N., Jacques, D., De Schutter, G., & Ye, G. (2016). Effect of limestone fillers on ca-leaching and carbonation of cement pastes. KEY ENGINEERING MATERIALS, 711, 269–276.
Vancouver
1.
Phung QT, Maes N, Jacques D, De Schutter G, Ye G. Effect of limestone fillers on ca-leaching and carbonation of cement pastes. KEY ENGINEERING MATERIALS. Trans Tech Publications; 2016;711:269–76.
MLA
Phung, Quoc Tri, Norbert Maes, Diederik Jacques, et al. “Effect of Limestone Fillers on Ca-leaching and Carbonation of Cement Pastes.” KEY ENGINEERING MATERIALS 711 (2016): 269–276. Print.