Effect of Microbial-Induced Carbonate Precipitation Technique on Properties of Recycled Clay Brick Aggregates.

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Bibliographic Details
Title:	Effect of Microbial-Induced Carbonate Precipitation Technique on Properties of Recycled Clay Brick Aggregates.
Authors:	Liu, Fang¹, Du, Mingxing², Wang, Jie³, Zhang, Wenyan⁴, Zhu, Jianping⁵, Feng, Chunhua⁴
Source:	ACI Materials Journal. May2026, Vol. 123 Issue 3, p157-168. 12p.
Subjects:	Compressive strength, Mineralization, Bacillus subtilis, Mineral aggregates, Bacteria
Abstract:	This study employed a mixed microbial culture (MB) comprising Bacillus subtilis (BS), Bacillus polymyxa (PM), and nitrate-reducing bacteria (NRB) in equal proportions. The mixed microbial culture was used to enhance recycled brick aggregate (RBA) through the microbial-induced carbonate precipitation (MICP) method, thus investigating the effects of this enhancement on both the aggregate and recycled mortar properties. Results indicate that the mineralization activity of the mixed culture significantly exceeded that of individual strains, achieving an 84.64% mineralization rate after 14 days. MICP-enhanced RBA demonstrated markedly improved performance. The compressive strength of the reinforced recycled mortar increased by 32.62% at 3 days and 22.6% at 28 days, with the 28-day compressive strength approaching that of cement mortar using natural aggregates. The interfacial transition zone (ITZ) properties were significantly improved, with their width reduced from 30 to 35 µm to 20 to 25 µm. This study provides experimental evidence for RBA reinforcement technology while offering technical support for the resource use of RBAs. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	This study employed a mixed microbial culture (MB) comprising Bacillus subtilis (BS), Bacillus polymyxa (PM), and nitrate-reducing bacteria (NRB) in equal proportions. The mixed microbial culture was used to enhance recycled brick aggregate (RBA) through the microbial-induced carbonate precipitation (MICP) method, thus investigating the effects of this enhancement on both the aggregate and recycled mortar properties. Results indicate that the mineralization activity of the mixed culture significantly exceeded that of individual strains, achieving an 84.64% mineralization rate after 14 days. MICP-enhanced RBA demonstrated markedly improved performance. The compressive strength of the reinforced recycled mortar increased by 32.62% at 3 days and 22.6% at 28 days, with the 28-day compressive strength approaching that of cement mortar using natural aggregates. The interfacial transition zone (ITZ) properties were significantly improved, with their width reduced from 30 to 35 µm to 20 to 25 µm. This study provides experimental evidence for RBA reinforcement technology while offering technical support for the resource use of RBAs. [ABSTRACT FROM AUTHOR]
ISSN:	0889325X
DOI:	10.14359/51749412