Imperial College London
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ProfessorChrisCheeseman

Faculty of Engineering, Department of Civil and Environmental Engineering

Professor of Materials Resources Engineering
 
 
 
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Contact

 

c.cheeseman

 
 
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Location

 

242Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Ding:2022:10.1016/j.jclepro.2022.132615,
author = {Ding, T and Wong, H and Qiao, X and Cheeseman, C},
doi = {10.1016/j.jclepro.2022.132615},
journal = {Journal of Cleaner Production},
pages = {1--8},
title = {Developing circular concrete: Acid treatment of waste concrete fines},
url = {http://dx.doi.org/10.1016/j.jclepro.2022.132615},
volume = {365},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The development of circular concrete, to enable key components to be extracted and reused, is a key requirement to achieve sustainability in the built environment. Current industry practice for end-of-life concrete is best described as down-cycling because recycled concrete aggregate has limited use, with disposal of the associated crushed concrete fines. Acid treatment of waste concrete is being investigated to allow key concrete components to become circular and, in this work, the effect of acetic acid concentration, liquid/solid (L/S) ratio, reaction time and temperature on the leaching of waste concrete fines is reported. An acid concentration of 0.6 mol/L, an L/S ratio of 7 ml/g, and a reaction time of 6 h at ambient temperature allows clean sand to be extracted from concrete fines. This performs identically to new sand in mortar samples. We show for the first time that the dried and ground silica-rich residue produced by acid leaching has pozzolanic properties comparable to commercially available supplementary cementitious materials (SCM) such as blast furnace slag and coal fly ash. The potential for CO2 sequestration using the Ca2+-rich leached solution to form CaCO3 is calculated. The research shows that acid leaching of concrete fines can produce clean reusable sand, generates a viable SCM and sequester significant amounts of CO2 by forming precipitated calcium carbonate.
AU  - Ding,T
AU  - Wong,H
AU  - Qiao,X
AU  - Cheeseman,C
DO  - 10.1016/j.jclepro.2022.132615
EP  - 8
PY  - 2022///
SN  - 0959-6526
SP  - 1
TI  - Developing circular concrete: Acid treatment of waste concrete fines
T2  - Journal of Cleaner Production
UR  - http://dx.doi.org/10.1016/j.jclepro.2022.132615
UR  - https://www.sciencedirect.com/science/article/pii/S0959652622022144?via%3Dihub
UR  - http://hdl.handle.net/10044/1/97792
VL  - 365
ER  -
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