Weatherability of microbial mineralized cemented debris and restoration of limestone cultural relics
ZHANG Yukai1, SHAO Guanghui1, HUANG Rongpin1, SHI Bo2, 3, DI Zhiqiang4, FANG Jiajun1
(1. College of Civil Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210049, China; 2. Jiangsu Urban and Rural Construction Vocational College, Changzhou, Jiangsu 213147, China; 3. Changzhou Heritage Conservation and
Development Research Institute, Changzhou, Jiangsu 213147, China; 4. Nanjing Hanggu Construction
Technology Development Co., Ltd., Nanjing, Jiangsu 211316, China)
Abstract：Microbial mineralization technology presents distinct advantages for the restoration of stone cultural relics due to its material compatibility and environmental benefits. This study investigates the mechanical properties and weather resistance of biomineralized limestone debris, assessing its effectiveness for in-situ restoration. Laboratory tests and field applications utilized particle size distribution of debris, calcium source concentration, and grouting parameters as control factors to evaluate the strength and weather resistance characteristics of biogrouting cemented limestone debris. A quantitative relationship between ultrasonic wave velocity and unconfined compressive strength was established for the consolidated aggregate. Combined with engineering applications and in-situ testing, the restoration effects of biogrouting on stone cultural relics were evaluated. Results demonstrate that the unconfined compressive strength of microbial mineralization cemented debris reaches 11.26 MPa, and this cemented debris exhibits good weather resistance under adverse environmental conditions. The calcite crystal cluster bridging structure not only enhances mechanical properties but also maintains air permeability at the repair site of stone cultural relics. Furthermore, the established quantitative relationship between ultrasonic wave velocity and unconfined compressive strength enables effective evaluation of the restoration effects on cultural relics. In-situ restoration of fractured stone relics displayed favorable characteristics, with the mineralized cemented debris at the repair site achieving a strength of 5.44 MPa and Barcol hardness reaching 89.25% of the original stone. This study confirms that biogrouting mineralized cemented limestone debris demonstrates engineering applicability for the restoration of limestone cultural relics and shows promising prospects for future applications.
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2025, Vol. 44 
