A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Mechanical properties and acoustic emission characteristics of microbial cemented backfill with various particle size distributions of recycled aggregates
https://orcid.org/0000-0003-4207-3884
Abstract The recycling of construction waste as underground filling material can solve the problem of insufficient filling material in the goaf and effectively maintain the safety of the stope. Microbially induced carbonate precipitation (MICP) technology was used to replace cement as cementitious material to prepare microbial cemented recycled aggregate backfill (MCRB). This study explored the effects of aggregate size distribution on the mechanical properties, failure patterns and microstructure of MCRB. Uniaxial compression tests, acoustic emission (AE) monitoring, and SEM analyses were performed on MCRB. The aggregate particles conformed to Talbot grading theory. The results indicated that MICP technology could enhance microstructure of recycled aggregates. The failure patterns of MCRB transitioned gradually from tensile failure to shear failure as the Talbot index increased. MCRB with Talbot index of 0.4 exhibited superior compressive strength. Furthermore, it also exhibited the highest crack initiation stress (CI), indicating that crack initiation was more difficult. CI of MCRB ranged from 24% to 34% of the peak stress, and crack damage stress (CD) varied from 59% to 72% of the peak stress. This study presents an innovative approach and methodology for the treatment of construction waste.
Highlights Using MICP technology as substitution of traditional cement in microbial cemented recycled aggregate backfill (MCRB). Effect of MICP technology on microscopic mechanisms of strengthening recycled aggregate was demonstrated by CT scanning. Influence of aggregate size distribution on mechanical properties, failure patterns and microstructure of MCRB was investigated. The damage evolution process and failure patterns of MCRB with different Talbot index were studied based on acoustic emission parameters. The crack initiation stress(CI) and crack damage stress(CD) of MCRB were determined using the acoustic emission energy approach.
Mechanical properties and acoustic emission characteristics of microbial cemented backfill with various particle size distributions of recycled aggregates
https://orcid.org/0000-0003-4207-3884
Abstract The recycling of construction waste as underground filling material can solve the problem of insufficient filling material in the goaf and effectively maintain the safety of the stope. Microbially induced carbonate precipitation (MICP) technology was used to replace cement as cementitious material to prepare microbial cemented recycled aggregate backfill (MCRB). This study explored the effects of aggregate size distribution on the mechanical properties, failure patterns and microstructure of MCRB. Uniaxial compression tests, acoustic emission (AE) monitoring, and SEM analyses were performed on MCRB. The aggregate particles conformed to Talbot grading theory. The results indicated that MICP technology could enhance microstructure of recycled aggregates. The failure patterns of MCRB transitioned gradually from tensile failure to shear failure as the Talbot index increased. MCRB with Talbot index of 0.4 exhibited superior compressive strength. Furthermore, it also exhibited the highest crack initiation stress (CI), indicating that crack initiation was more difficult. CI of MCRB ranged from 24% to 34% of the peak stress, and crack damage stress (CD) varied from 59% to 72% of the peak stress. This study presents an innovative approach and methodology for the treatment of construction waste.
Highlights Using MICP technology as substitution of traditional cement in microbial cemented recycled aggregate backfill (MCRB). Effect of MICP technology on microscopic mechanisms of strengthening recycled aggregate was demonstrated by CT scanning. Influence of aggregate size distribution on mechanical properties, failure patterns and microstructure of MCRB was investigated. The damage evolution process and failure patterns of MCRB with different Talbot index were studied based on acoustic emission parameters. The crack initiation stress(CI) and crack damage stress(CD) of MCRB were determined using the acoustic emission energy approach.
Mechanical properties and acoustic emission characteristics of microbial cemented backfill with various particle size distributions of recycled aggregates
https://orcid.org/0000-0003-4207-3884
Abstract The recycling of construction waste as underground filling material can solve the problem of insufficient filling material in the goaf and effectively maintain the safety of the stope. Microbially induced carbonate precipitation (MICP) technology was used to replace cement as cementitious material to prepare microbial cemented recycled aggregate backfill (MCRB). This study explored the effects of aggregate size distribution on the mechanical properties, failure patterns and microstructure of MCRB. Uniaxial compression tests, acoustic emission (AE) monitoring, and SEM analyses were performed on MCRB. The aggregate particles conformed to Talbot grading theory. The results indicated that MICP technology could enhance microstructure of recycled aggregates. The failure patterns of MCRB transitioned gradually from tensile failure to shear failure as the Talbot index increased. MCRB with Talbot index of 0.4 exhibited superior compressive strength. Furthermore, it also exhibited the highest crack initiation stress (CI), indicating that crack initiation was more difficult. CI of MCRB ranged from 24% to 34% of the peak stress, and crack damage stress (CD) varied from 59% to 72% of the peak stress. This study presents an innovative approach and methodology for the treatment of construction waste.
Highlights Using MICP technology as substitution of traditional cement in microbial cemented recycled aggregate backfill (MCRB). Effect of MICP technology on microscopic mechanisms of strengthening recycled aggregate was demonstrated by CT scanning. Influence of aggregate size distribution on mechanical properties, failure patterns and microstructure of MCRB was investigated. The damage evolution process and failure patterns of MCRB with different Talbot index were studied based on acoustic emission parameters. The crack initiation stress(CI) and crack damage stress(CD) of MCRB were determined using the acoustic emission energy approach.
Mechanical properties and acoustic emission characteristics of microbial cemented backfill with various particle size distributions of recycled aggregates
Ji, Yifan (author) / Xie, Liquan (author) / Xiao, Jianzhuang (author) / Zheng, Yonglai (author) / Ma, Shili (author) / Pan, Tanbo (author)
2024-01-29
Article (Journal)
Electronic Resource
English