Title:
Effect of MICP Technique on the Properties of Recycled Clay Brick Aggregates (Prepublished)
Author(s):
Fang Liu, Mingxing Du, Jie Wang, Wenyan Zhang, Jianping Zhu, Chunhua Feng
Publication:
Materials Journal
Volume:
Issue:
Appears on pages(s):
Keywords:
microbially induced carbonate precipitation; mineralization activity; recycled brick aggregate; recycled mortar
DOI:
10.14359/51749412
Date:
12/18/2025
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, 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 properties were significantly improved, with its width reduced from 30-wenzhong35 μm to 20-25 μm. This study provides experimental evidence for recycled brick aggregate reinforcement technology while offering technical support for the resource utilization of recycled brick aggregates.