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The assessment of clinker and cement regenerated from completely recyclable concrete

Mieke De Schepper UGent, Lies Vernimmen UGent, Nele De Belie UGent, Klaartje De Buysser UGent and Isabel Van Driessche UGent (2011) Chemistry of Cement, XIII ICCC International congress, Proceedings. In XIII ICCC International Congress on the Chemistry of Cement
abstract
As the construction sector uses 50% of the earth’s raw material and produces 50% of its waste, the development of more durable and sustainable building products is crucial. Nowadays, Construction and Demolition Waste (CDW) is already used as recycled aggregates in low-value concrete applications, since it is mostly inert material. On the other hand, the general trend today for the cement industries is the use of alternative raw materials for the production of cement clinker. From this and the above mentioned need for high-value recycling of CDW, the concept of completely recyclable concrete (CRC) has been developed. After demolition of a CRC-construction, the material cycle is closed as the concrete rubble is given a second life as raw material for cement production, without need for adjustments. Therefore, the concrete mixture is designed to be chemically equivalent to raw material for cement production by adequately incorporating limestone aggregates, different types of cement and industrial by-products. For this study, completely recyclable concrete was designed and produced. Within the design process, the chemical composition of the produced CRC was evaluated with the lime saturation factor, the silica modulus, the alumina modulus and the hydraulic modulus. In addition, the potential mineralogical composition was calculated according to the formulas of Bogue. Then, clinker was regenerated by burning ground CRC in a laboratory furnace by raising the temperature at a constant rate (15 °C/min) to 1350, 1400 and 1450 °C and maintaining it for 30 minutes. After burning, the clinker was immediately air-cooled by removing it from the furnace. The quality of the produced clinker and the influence of the burning temperature thereupon were investigated by determining the free lime content, and by microscopic and X-ray diffraction analysis. Based on these results, the ideal burning temperature was selected to produce cement. This cement was produced by grinding the clinker with calcium sulphate anhydrite. The hydration heat of cement pastes was measured in isothermal conditions and mortars were produced for compressive strength tests
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
Completely recyclable concrete, cradle-to-cradle, clinker regeneration, cement regeneration
in
Chemistry of Cement, XIII ICCC International congress, Proceedings
series title
XIII ICCC International Congress on the Chemistry of Cement
publisher
Ghent University, Department of Structural engineering
place of publication
Ghent, Belgium
conference name
13th ICCC International congress on the Chemistry of Cement
conference location
Madrid, Spain
conference start
2011-07-03
conference end
2011-07-08
language
English
UGent publication?
yes
classification
C1
copyright statement
I have retained and own the full copyright for this publication
id
2091578
handle
http://hdl.handle.net/1854/LU-2091578
date created
2012-04-19 14:29:57
date last changed
2012-06-27 13:09:28
@inproceedings{2091578,
  abstract     = {As the construction sector uses 50\% of the earth{\textquoteright}s raw material and produces 50\% of its waste, the development of more durable and sustainable building products is crucial. Nowadays, Construction and Demolition Waste (CDW) is already used as recycled aggregates in low-value concrete applications, since it is mostly inert material. On the other hand, the general trend today for the cement industries is the use of alternative raw materials for the production of cement clinker. From this and the above mentioned need for high-value recycling of CDW, the concept of completely recyclable concrete (CRC) has been developed. After demolition of a CRC-construction, the material cycle is closed as the concrete rubble is given a second life as raw material for cement production, without need for adjustments. Therefore, the concrete mixture is designed to be chemically equivalent to raw material for cement production by adequately incorporating limestone aggregates, different types of cement and industrial by-products. For this study, completely recyclable concrete was designed and produced. Within the design process, the chemical composition of the produced CRC was evaluated with the lime saturation factor, the silica modulus, the alumina modulus and the hydraulic modulus. In addition, the potential mineralogical composition was calculated according to the formulas of Bogue. Then, clinker was regenerated by burning ground CRC in a laboratory furnace by raising the temperature at a constant rate (15 {\textdegree}C/min) to 1350, 1400 and 1450 {\textdegree}C and maintaining it for 30 minutes. After burning, the clinker was immediately air-cooled by removing it from the furnace. The quality of the produced clinker and the influence of the burning temperature thereupon were investigated by determining the free lime content, and by microscopic and X-ray diffraction analysis. Based on these results, the ideal burning temperature was selected to produce cement. This cement was produced by grinding the clinker with calcium sulphate anhydrite. The hydration heat of cement pastes was measured in isothermal conditions and mortars were produced for compressive strength tests},
  author       = {De Schepper, Mieke and Vernimmen, Lies and De Belie, Nele and De Buysser, Klaartje and Van Driessche, Isabel},
  booktitle    = {Chemistry of Cement, XIII ICCC International congress, Proceedings},
  keyword      = {Completely recyclable concrete,cradle-to-cradle,clinker regeneration,cement regeneration},
  language     = {eng},
  location     = {Madrid, Spain},
  publisher    = {Ghent University, Department of Structural engineering},
  title        = {The assessment of clinker and cement regenerated from completely recyclable concrete},
  year         = {2011},
}

Chicago
De Schepper, Mieke, Lies Vernimmen, Nele De Belie, Klaartje De Buysser, and Isabel Van Driessche. 2011. “The Assessment of Clinker and Cement Regenerated from Completely Recyclable Concrete.” In Chemistry of Cement, XIII ICCC International Congress, Proceedings. Ghent, Belgium: Ghent University, Department of Structural engineering.
APA
De Schepper, M., Vernimmen, L., De Belie, N., De Buysser, K., & Van Driessche, I. (2011). The assessment of clinker and cement regenerated from completely recyclable concrete. Chemistry of Cement, XIII ICCC International congress, Proceedings. Presented at the 13th ICCC International congress on the Chemistry of Cement, Ghent, Belgium: Ghent University, Department of Structural engineering.
Vancouver
1.
De Schepper M, Vernimmen L, De Belie N, De Buysser K, Van Driessche I. The assessment of clinker and cement regenerated from completely recyclable concrete. Chemistry of Cement, XIII ICCC International congress, Proceedings. Ghent, Belgium: Ghent University, Department of Structural engineering; 2011.
MLA
De Schepper, Mieke, Lies Vernimmen, Nele De Belie, et al. “The Assessment of Clinker and Cement Regenerated from Completely Recyclable Concrete.” Chemistry of Cement, XIII ICCC International Congress, Proceedings. Ghent, Belgium: Ghent University, Department of Structural engineering, 2011. Print.