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Clinkering reactions during firing of recyclable concrete

Ruben Snellings UGent, Mieke De Schepper UGent, Klaartje De Buysser UGent, Isabel Van Driessche UGent and Nele De Belie UGent (2012) JOURNAL OF THE AMERICAN CERAMIC SOCIETY. 95(5). p.1741-1749
abstract
Thermal transformations occurring during firing of recyclable concrete and hydrated Portland cement paste were monitored quantitatively by in situ and ex situ X-ray diffraction, thermal analysis, and clinker microscopy. Reactions below 1150 degrees C were dominated by either the decarbonation of calcium carbonates of the limestone aggregate fraction in the recyclable concrete or the low temperature decomposition of cement hydrates of the cement paste. Continued heating of the cement paste showed a rapid and extensive reaction of the free lime to form intermediate calcium silicate and aluminate phases such as belite, gehlenite, mayenite, and ye'elimite. The combination of free lime was less rapid in the dominantly limestone-rich recyclable concrete. Similarly, subsequent melt and clinker phase formation (1250 degrees C and higher) occurred more rapidly in the hydrated cement paste, indicating a positive contribution of cement hydrates to raw meal burnability. Reactions below typical cement clinkering temperatures were enhanced (1) by the intimate mixing of lime, silicate, and aluminate components in the hydrated cement and (2) by the elevated sulfate content that acted as flux and belite mineralizer. Lime formed in the thermal decomposition of portlandite (+/- 450 degrees C) was partially carbonated to calcite at temperatures below the onset of calcite decarbonation (+/- 650 degrees C).
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
CHEMISTRY, PHASES, TEMPERATURE, RAW-MATERIALS, PORTLAND-CEMENT CLINKER, ASH
journal title
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
J. Am. Ceram. Soc.
volume
95
issue
5
pages
1741 - 1749
Web of Science type
Article
Web of Science id
000303797500043
JCR category
MATERIALS SCIENCE, CERAMICS
JCR impact factor
2.107 (2012)
JCR rank
2/26 (2012)
JCR quartile
1 (2012)
ISSN
0002-7820
DOI
10.1111/j.1551-2916.2012.05168.x
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2091551
handle
http://hdl.handle.net/1854/LU-2091551
date created
2012-04-19 14:29:57
date last changed
2012-08-16 15:52:47
@article{2091551,
  abstract     = {Thermal transformations occurring during firing of recyclable concrete and hydrated Portland cement paste were monitored quantitatively by in situ and ex situ X-ray diffraction, thermal analysis, and clinker microscopy. Reactions below 1150 degrees C were dominated by either the decarbonation of calcium carbonates of the limestone aggregate fraction in the recyclable concrete or the low temperature decomposition of cement hydrates of the cement paste. Continued heating of the cement paste showed a rapid and extensive reaction of the free lime to form intermediate calcium silicate and aluminate phases such as belite, gehlenite, mayenite, and ye'elimite. The combination of free lime was less rapid in the dominantly limestone-rich recyclable concrete. Similarly, subsequent melt and clinker phase formation (1250 degrees C and higher) occurred more rapidly in the hydrated cement paste, indicating a positive contribution of cement hydrates to raw meal burnability. Reactions below typical cement clinkering temperatures were enhanced (1) by the intimate mixing of lime, silicate, and aluminate components in the hydrated cement and (2) by the elevated sulfate content that acted as flux and belite mineralizer. Lime formed in the thermal decomposition of portlandite (+/- 450 degrees C) was partially carbonated to calcite at temperatures below the onset of calcite decarbonation (+/- 650 degrees C).},
  author       = {Snellings, Ruben and De Schepper, Mieke and De Buysser, Klaartje and Van Driessche, Isabel and De Belie, Nele},
  issn         = {0002-7820},
  journal      = {JOURNAL OF THE AMERICAN CERAMIC SOCIETY},
  keyword      = {CHEMISTRY,PHASES,TEMPERATURE,RAW-MATERIALS,PORTLAND-CEMENT CLINKER,ASH},
  language     = {eng},
  number       = {5},
  pages        = {1741--1749},
  title        = {Clinkering reactions during firing of recyclable concrete},
  url          = {http://dx.doi.org/10.1111/j.1551-2916.2012.05168.x},
  volume       = {95},
  year         = {2012},
}

Chicago
Snellings, Ruben, Mieke De Schepper, Klaartje De Buysser, Isabel Van Driessche, and Nele De Belie. 2012. “Clinkering Reactions During Firing of Recyclable Concrete.” Journal of the American Ceramic Society 95 (5): 1741–1749.
APA
Snellings, R., De Schepper, M., De Buysser, K., Van Driessche, I., & De Belie, N. (2012). Clinkering reactions during firing of recyclable concrete. JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 95(5), 1741–1749.
Vancouver
1.
Snellings R, De Schepper M, De Buysser K, Van Driessche I, De Belie N. Clinkering reactions during firing of recyclable concrete. JOURNAL OF THE AMERICAN CERAMIC SOCIETY. 2012;95(5):1741–9.
MLA
Snellings, Ruben, Mieke De Schepper, Klaartje De Buysser, et al. “Clinkering Reactions During Firing of Recyclable Concrete.” JOURNAL OF THE AMERICAN CERAMIC SOCIETY 95.5 (2012): 1741–1749. Print.