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Microbial carbonate precipitation for the improvement of quality of recycled aggregates

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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.
Keywords
SURFACE-TREATMENT, CEMENTITIOUS MATERIALS, DEMOLITION WASTE, CONCRETE, CONSTRUCTION, Recycled aggregates, Water absorption, Porosity, Biogenic CaCO3, Immersion

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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.
@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},
}

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