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Microbial carbonate precipitation for the improvement of quality of recycled aggregates

Jianyun Wang UGent, Brecht Vandevyvere, Sam Vanhessche, Joris Schoon, Nico Boon UGent and Nele De Belie UGent (2017) JOURNAL OF CLEANER PRODUCTION. 156. p.355-366
abstract
High water absorption is the main drawback of recycled aggregates which greatly hinders the re-use of them in concrete production. In this study, bio-deposition treatment, based on bacterially induced CaCO3 precipitation, was applied to improve the quality of the recycled aggregates. Two representative recycled aggregates, recycled concrete aggregates (CA) and mixed aggregates (MA) were used. The bacterial CaCO3 precipitated on the surface and in the pores of the recycled aggregate worked as a barrier for the penetration of water, and hence the water absorption of the aggregates can be decreased. Firstly, the optimal treatment method was determined by screening among spraying and several immersion strategies. It was found that the two times immersion treatment was the best method. Samples subjected to this method had a high weight increase (2% for CA and 2.5% for MA) and largest extent of water absorption decrease (one percentage point drop for CA and two percentage points drop for MA). Furthermore, The biogenic CaCO3 had a good cohesion and strong bond with the aggregate surface. Very limited (< 0.1%) mass loss occurred on the bio-treated samples while the mass loss of the untreated aggregates was much higher (0.2% for CA and 0.5% for MA). This indicated that the surface of the aggregates was strengthened by the biogenic CaCO3 as well. After using the bio-treated aggregates, the compressive strength was increased by 40% for CA concrete and 16% for MA; the water absorption was decreased by 27% for CA concrete and 20% for MA concrete. (C) 2017 Elsevier Ltd. All rights reserved.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
SURFACE-TREATMENT, CEMENTITIOUS MATERIALS, DEMOLITION WASTE, CONCRETE, CONSTRUCTION, Recycled aggregates, Water absorption, Porosity, Biogenic CaCO3, Immersion
journal title
JOURNAL OF CLEANER PRODUCTION
J. Clean Prod.
volume
156
pages
12 pages
publisher
Elsevier Sci Ltd
place of publication
Oxford
Web of Science type
Article
Web of Science id
000403028500033
ISSN
0959-6526
1879-1786
DOI
10.1016/j.jclepro.2017.04.051
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
8557524
handle
http://hdl.handle.net/1854/LU-8557524
date created
2018-03-27 13:18:04
date last changed
2018-05-14 09:39:04
@article{8557524,
  abstract     = {High water absorption is the main drawback of recycled aggregates which greatly hinders the re-use of them in concrete production. In this study, bio-deposition treatment, based on bacterially induced CaCO3 precipitation, was applied to improve the quality of the recycled aggregates. Two representative recycled aggregates, recycled concrete aggregates (CA) and mixed aggregates (MA) were used. The bacterial CaCO3 precipitated on the surface and in the pores of the recycled aggregate worked as a barrier for the penetration of water, and hence the water absorption of the aggregates can be decreased. Firstly, the optimal treatment method was determined by screening among spraying and several immersion strategies. It was found that the two times immersion treatment was the best method. Samples subjected to this method had a high weight increase (2\% for CA and 2.5\% for MA) and largest extent of water absorption decrease (one percentage point drop for CA and two percentage points drop for MA). Furthermore, The biogenic CaCO3 had a good cohesion and strong bond with the aggregate surface. Very limited ({\textlangle} 0.1\%) mass loss occurred on the bio-treated samples while the mass loss of the untreated aggregates was much higher (0.2\% for CA and 0.5\% for MA). This indicated that the surface of the aggregates was strengthened by the biogenic CaCO3 as well. After using the bio-treated aggregates, the compressive strength was increased by 40\% for CA concrete and 16\% for MA; the water absorption was decreased by 27\% for CA concrete and 20\% for MA concrete. (C) 2017 Elsevier Ltd. All rights reserved.},
  author       = {Wang, Jianyun and Vandevyvere, Brecht and Vanhessche, Sam and Schoon, Joris and Boon, Nico and De Belie, Nele},
  issn         = {0959-6526},
  journal      = {JOURNAL OF CLEANER PRODUCTION},
  keyword      = {SURFACE-TREATMENT,CEMENTITIOUS MATERIALS,DEMOLITION WASTE,CONCRETE,CONSTRUCTION,Recycled aggregates,Water absorption,Porosity,Biogenic CaCO3,Immersion},
  language     = {eng},
  pages        = {355--366},
  publisher    = {Elsevier Sci Ltd},
  title        = {Microbial carbonate precipitation for the improvement of quality of recycled aggregates},
  url          = {http://dx.doi.org/10.1016/j.jclepro.2017.04.051},
  volume       = {156},
  year         = {2017},
}

Chicago
Wang, Jianyun, Brecht Vandevyvere, Sam Vanhessche, Joris Schoon, Nico Boon, and Nele De Belie. 2017. “Microbial Carbonate Precipitation for the Improvement of Quality of Recycled Aggregates.” Journal of Cleaner Production 156: 355–366.
APA
Wang, Jianyun, Vandevyvere, B., Vanhessche, S., Schoon, J., Boon, N., & De Belie, N. (2017). Microbial carbonate precipitation for the improvement of quality of recycled aggregates. JOURNAL OF CLEANER PRODUCTION, 156, 355–366.
Vancouver
1.
Wang J, Vandevyvere B, Vanhessche S, Schoon J, Boon N, De Belie N. Microbial carbonate precipitation for the improvement of quality of recycled aggregates. JOURNAL OF CLEANER PRODUCTION. Oxford: Elsevier Sci Ltd; 2017;156:355–66.
MLA
Wang, Jianyun, Brecht Vandevyvere, Sam Vanhessche, et al. “Microbial Carbonate Precipitation for the Improvement of Quality of Recycled Aggregates.” JOURNAL OF CLEANER PRODUCTION 156 (2017): 355–366. Print.