Factors Affecting the Physical Properties of Microbial Induced Calcium Carbonate Precipitation (MICP) Enhanced Recycled Aggregates
Microbial-induced calcium carbonate precipitation (MICP) can enhance the physical properties of recycled aggregates. Compared to traditional technologies, MICP offers environmental benefits and produces no pollution. However, its mineralization efficacy is significantly influenced by the process par...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-09-01
|
| Series: | Buildings |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-5309/14/9/2851 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850258333131341824 |
|---|---|
| author | Jin Zhang Cong Wang Zhipeng Wang |
| author_facet | Jin Zhang Cong Wang Zhipeng Wang |
| author_sort | Jin Zhang |
| collection | DOAJ |
| description | Microbial-induced calcium carbonate precipitation (MICP) can enhance the physical properties of recycled aggregates. Compared to traditional technologies, MICP offers environmental benefits and produces no pollution. However, its mineralization efficacy is significantly influenced by the process parameters. To investigate this, an MICP mineralization test was conducted by manipulating various process parameters throughout the mineralization process. The water absorption rate, apparent density, and calcium carbonate content of the mineralized recycled aggregates were assessed to discern the impact of these parameters on the mineralization outcome. Further analysis using techniques such as thermogravimetric analysis (TG), X-ray diffraction (XRD), nuclear magnetic resonance (NMR), and scanning electron microscopy (SEM) were employed to elucidate the mineralization mechanism of the recycled aggregates at a micro-level. The findings indicated that the MICP treatment induced bacteria to precipitate CaCO<sub>3</sub>, forming calcite crystalline CaCO<sub>3</sub> within the pores and microcracks. This led to a denser interfacial transition zone and, consequently, improved the physical properties of the recycled aggregates. Optimal mineralization was achieved when the bacterial solution concentration was 1.4, the temperature and pH were 35 °C and 9, respectively, and the urea concentration, Ca<sup>+</sup> concentration, and mineralization time were 0.5 mol/L, 0.5 mol/L, and 7 days, respectively. Under these conditions, the mineralized recycled aggregate exhibited a 16.07% reduction in water absorption, a 1.07% increase in apparent density, and a 2.28% change in mass. |
| format | Article |
| id | doaj-art-edaaff0b1bb64636b8b5638d63780c70 |
| institution | OA Journals |
| issn | 2075-5309 |
| language | English |
| publishDate | 2024-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj-art-edaaff0b1bb64636b8b5638d63780c702025-08-20T01:56:12ZengMDPI AGBuildings2075-53092024-09-01149285110.3390/buildings14092851Factors Affecting the Physical Properties of Microbial Induced Calcium Carbonate Precipitation (MICP) Enhanced Recycled AggregatesJin Zhang0Cong Wang1Zhipeng Wang2School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, ChinaSchool of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, ChinaSchool of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, ChinaMicrobial-induced calcium carbonate precipitation (MICP) can enhance the physical properties of recycled aggregates. Compared to traditional technologies, MICP offers environmental benefits and produces no pollution. However, its mineralization efficacy is significantly influenced by the process parameters. To investigate this, an MICP mineralization test was conducted by manipulating various process parameters throughout the mineralization process. The water absorption rate, apparent density, and calcium carbonate content of the mineralized recycled aggregates were assessed to discern the impact of these parameters on the mineralization outcome. Further analysis using techniques such as thermogravimetric analysis (TG), X-ray diffraction (XRD), nuclear magnetic resonance (NMR), and scanning electron microscopy (SEM) were employed to elucidate the mineralization mechanism of the recycled aggregates at a micro-level. The findings indicated that the MICP treatment induced bacteria to precipitate CaCO<sub>3</sub>, forming calcite crystalline CaCO<sub>3</sub> within the pores and microcracks. This led to a denser interfacial transition zone and, consequently, improved the physical properties of the recycled aggregates. Optimal mineralization was achieved when the bacterial solution concentration was 1.4, the temperature and pH were 35 °C and 9, respectively, and the urea concentration, Ca<sup>+</sup> concentration, and mineralization time were 0.5 mol/L, 0.5 mol/L, and 7 days, respectively. Under these conditions, the mineralized recycled aggregate exhibited a 16.07% reduction in water absorption, a 1.07% increase in apparent density, and a 2.28% change in mass.https://www.mdpi.com/2075-5309/14/9/2851recycled aggregate (RA)microbial induced calcium carbonate precipitationperformance improvementmicroscopic analysis |
| spellingShingle | Jin Zhang Cong Wang Zhipeng Wang Factors Affecting the Physical Properties of Microbial Induced Calcium Carbonate Precipitation (MICP) Enhanced Recycled Aggregates Buildings recycled aggregate (RA) microbial induced calcium carbonate precipitation performance improvement microscopic analysis |
| title | Factors Affecting the Physical Properties of Microbial Induced Calcium Carbonate Precipitation (MICP) Enhanced Recycled Aggregates |
| title_full | Factors Affecting the Physical Properties of Microbial Induced Calcium Carbonate Precipitation (MICP) Enhanced Recycled Aggregates |
| title_fullStr | Factors Affecting the Physical Properties of Microbial Induced Calcium Carbonate Precipitation (MICP) Enhanced Recycled Aggregates |
| title_full_unstemmed | Factors Affecting the Physical Properties of Microbial Induced Calcium Carbonate Precipitation (MICP) Enhanced Recycled Aggregates |
| title_short | Factors Affecting the Physical Properties of Microbial Induced Calcium Carbonate Precipitation (MICP) Enhanced Recycled Aggregates |
| title_sort | factors affecting the physical properties of microbial induced calcium carbonate precipitation micp enhanced recycled aggregates |
| topic | recycled aggregate (RA) microbial induced calcium carbonate precipitation performance improvement microscopic analysis |
| url | https://www.mdpi.com/2075-5309/14/9/2851 |
| work_keys_str_mv | AT jinzhang factorsaffectingthephysicalpropertiesofmicrobialinducedcalciumcarbonateprecipitationmicpenhancedrecycledaggregates AT congwang factorsaffectingthephysicalpropertiesofmicrobialinducedcalciumcarbonateprecipitationmicpenhancedrecycledaggregates AT zhipengwang factorsaffectingthephysicalpropertiesofmicrobialinducedcalciumcarbonateprecipitationmicpenhancedrecycledaggregates |