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Carbonation mechanism of different kind of C-S-H : rate and products

Bei Wu and Guang Ye UGent (2016) Concrete with Supplementary Cementitious Materials. RILEM PRO 113. p.163-272
abstract
During the carbonation of cement paste blended with supplementary cementitious materials, the C-S-H with different Ca/Si ratios, formed from the hydration and pozzolanic reactions, are the major calcium-bearing phases which react with CO2. Therefore, it’s important to study the carbonation mechanism of different C-S-H phases. In this paper, the pure C-S-H phases (Ca/Si ratio: 0.66 to 2.0) were synthesized and used for the accelerated carbonation test. Synthesized C-S-H phases with different Ca/Si ratio were identified by X-ray diffraction and 29Si nuclear magnetic resonance. The carbonation rate and products of different C-S-H phases are also determined. The results show that pure C-S-H phases with different Ca/Si ratio (lower than 1.40) can be synthesized in the lab. The structure of synthesized C-S-H is similar to the C-S-H(I) reported by Taylor. The mean chain length of the C-S-H decreases dramatically when the Ca/Si ratio increases from 0.66 to 1.40, then it keeps no change. The portlandite appears in the products when the designed Ca/Si ratio is over 1.40. The C-S-H with lower Ca/Si ratio is decomposed faster than that with a higher Ca/Si ratio. All the C-S-H phases are fully decomposed to CaCO3 and silica gel after 3 days’ accelerated carbonation.
Please use this url to cite or link to this publication:
author
organization
year
type
conference (other)
publication status
published
subject
in
Concrete with Supplementary Cementitious Materials
editor
Ole M Jensen, Konstantin Kovler and Nele De Belie UGent
volume
RILEM PRO 113
pages
455 pages
publisher
RILEM
place of publication
Paris, France
conference name
Int. RILEM Conference on Materials, Systems and Structures in Civil Engineering 2016 - Segment on Concrete with Supplementary Cementitious Materials
conference location
Lyngby (Denmark)
conference start
2016-08-22
conference end
2016-08-24
ISBN
978-2-35158-180-3
978-2-35158-181-0
language
English
UGent publication?
yes
classification
C1
copyright statement
I have transferred the copyright for this publication to the publisher
id
8531148
handle
http://hdl.handle.net/1854/LU-8531148
date created
2017-09-14 11:02:16
date last changed
2017-09-19 07:44:14
@inproceedings{8531148,
  abstract     = {During the carbonation of cement paste blended with supplementary cementitious materials,
the C-S-H with different Ca/Si ratios, formed from the hydration and pozzolanic reactions, are
the major calcium-bearing phases which react with CO2. Therefore, it{\textquoteright}s important to study the
carbonation mechanism of different C-S-H phases. In this paper, the pure C-S-H phases
(Ca/Si ratio: 0.66 to 2.0) were synthesized and used for the accelerated carbonation test.
Synthesized C-S-H phases with different Ca/Si ratio were identified by X-ray diffraction and
29Si nuclear magnetic resonance. The carbonation rate and products of different C-S-H phases
are also determined. The results show that pure C-S-H phases with different Ca/Si ratio (lower
than 1.40) can be synthesized in the lab. The structure of synthesized C-S-H is similar to the
C-S-H(I) reported by Taylor. The mean chain length of the C-S-H decreases dramatically
when the Ca/Si ratio increases from 0.66 to 1.40, then it keeps no change. The portlandite
appears in the products when the designed Ca/Si ratio is over 1.40. The C-S-H with lower
Ca/Si ratio is decomposed faster than that with a higher Ca/Si ratio. All the C-S-H phases are
fully decomposed to CaCO3 and silica gel after 3 days{\textquoteright} accelerated carbonation.},
  author       = {Wu, Bei and Ye, Guang},
  booktitle    = {Concrete with Supplementary Cementitious Materials},
  editor       = {Jensen, Ole M and Kovler, Konstantin and De Belie, Nele},
  isbn         = {978-2-35158-180-3},
  language     = {eng},
  location     = {Lyngby (Denmark)},
  pages        = {163--272},
  publisher    = {RILEM},
  title        = {Carbonation mechanism of different kind of C-S-H : rate and products},
  volume       = {RILEM PRO 113},
  year         = {2016},
}

Chicago
Wu, Bei, and Guang Ye. 2016. “Carbonation Mechanism of Different Kind of C-S-H : Rate and Products.” In Concrete with Supplementary Cementitious Materials, ed. Ole M Jensen, Konstantin Kovler, and Nele De Belie, RILEM PRO 113:163–272. Paris, France: RILEM.
APA
Wu, Bei, & Ye, G. (2016). Carbonation mechanism of different kind of C-S-H : rate and products. In Ole M Jensen, K. Kovler, & N. De Belie (Eds.), Concrete with Supplementary Cementitious Materials (Vol. RILEM PRO 113, pp. 163–272). Presented at the Int. RILEM Conference on Materials, Systems and Structures in Civil Engineering 2016 - Segment on Concrete with Supplementary Cementitious Materials, Paris, France: RILEM.
Vancouver
1.
Wu B, Ye G. Carbonation mechanism of different kind of C-S-H : rate and products. In: Jensen OM, Kovler K, De Belie N, editors. Concrete with Supplementary Cementitious Materials. Paris, France: RILEM; 2016. p. 163–272.
MLA
Wu, Bei, and Guang Ye. “Carbonation Mechanism of Different Kind of C-S-H : Rate and Products.” Concrete with Supplementary Cementitious Materials. Ed. Ole M Jensen, Konstantin Kovler, & Nele De Belie. RILEM PRO 113. Paris, France: RILEM, 2016. 163–272. Print.