Using microbial carbonate precipitation to improve the properties of recycled fine aggregate and mortar

Zhangyao Feng, Yuxi Zhao*, Weilai Zeng, Zhenmei Lu, Surendra P Shah

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

This study investigates the use of microbial carbonate precipitation (MCP) by Sporosarcina pasteurii (S. pasteurii) to improve the properties of recycled fine aggregate (RFA). The factors influencing MCP are experimentally investigated. The recommended precipitation conditions for the pH, bacteria concentration, and calcium concentration are determined to be 9.5, 108 cells/mL, and 0.55 mol/L, respectively. Under these proposed conditions, the effects of MCP modification on RFA are also investigated and found the weight of modified RFA increases and the water absorption of modified RFA decreases. The flexural strength and compressive strength of mortar specimens cast by modified aggregate are improved. The result confirms the positive effects of MCP for improving the properties of RFA.

Original languageEnglish (US)
Article number116949
JournalConstruction and Building Materials
Volume230
DOIs
StatePublished - Jan 10 2020

Fingerprint

Carbonates
Mortar
Water absorption
Bending strength
Compressive strength
Calcium
Bacteria

Keywords

  • Bio-deposition modification
  • Microbial carbonate precipitation
  • Recycled fine aggregate

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

Cite this

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title = "Using microbial carbonate precipitation to improve the properties of recycled fine aggregate and mortar",
abstract = "This study investigates the use of microbial carbonate precipitation (MCP) by Sporosarcina pasteurii (S. pasteurii) to improve the properties of recycled fine aggregate (RFA). The factors influencing MCP are experimentally investigated. The recommended precipitation conditions for the pH, bacteria concentration, and calcium concentration are determined to be 9.5, 108 cells/mL, and 0.55 mol/L, respectively. Under these proposed conditions, the effects of MCP modification on RFA are also investigated and found the weight of modified RFA increases and the water absorption of modified RFA decreases. The flexural strength and compressive strength of mortar specimens cast by modified aggregate are improved. The result confirms the positive effects of MCP for improving the properties of RFA.",
keywords = "Bio-deposition modification, Microbial carbonate precipitation, Recycled fine aggregate",
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Using microbial carbonate precipitation to improve the properties of recycled fine aggregate and mortar. / Feng, Zhangyao; Zhao, Yuxi; Zeng, Weilai; Lu, Zhenmei; Shah, Surendra P.

In: Construction and Building Materials, Vol. 230, 116949, 10.01.2020.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Using microbial carbonate precipitation to improve the properties of recycled fine aggregate and mortar

AU - Feng, Zhangyao

AU - Zhao, Yuxi

AU - Zeng, Weilai

AU - Lu, Zhenmei

AU - Shah, Surendra P

PY - 2020/1/10

Y1 - 2020/1/10

N2 - This study investigates the use of microbial carbonate precipitation (MCP) by Sporosarcina pasteurii (S. pasteurii) to improve the properties of recycled fine aggregate (RFA). The factors influencing MCP are experimentally investigated. The recommended precipitation conditions for the pH, bacteria concentration, and calcium concentration are determined to be 9.5, 108 cells/mL, and 0.55 mol/L, respectively. Under these proposed conditions, the effects of MCP modification on RFA are also investigated and found the weight of modified RFA increases and the water absorption of modified RFA decreases. The flexural strength and compressive strength of mortar specimens cast by modified aggregate are improved. The result confirms the positive effects of MCP for improving the properties of RFA.

AB - This study investigates the use of microbial carbonate precipitation (MCP) by Sporosarcina pasteurii (S. pasteurii) to improve the properties of recycled fine aggregate (RFA). The factors influencing MCP are experimentally investigated. The recommended precipitation conditions for the pH, bacteria concentration, and calcium concentration are determined to be 9.5, 108 cells/mL, and 0.55 mol/L, respectively. Under these proposed conditions, the effects of MCP modification on RFA are also investigated and found the weight of modified RFA increases and the water absorption of modified RFA decreases. The flexural strength and compressive strength of mortar specimens cast by modified aggregate are improved. The result confirms the positive effects of MCP for improving the properties of RFA.

KW - Bio-deposition modification

KW - Microbial carbonate precipitation

KW - Recycled fine aggregate

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