{"title":"利用微生物诱导方解石沉淀优化的碳酸钠制备低温固化地聚合物","authors":"Nutthachai Prongmanee , Suksun Horpibulsuk , Rujira Pholtrai , Amorndech Noulmanee , Ruethaithip Dulyasucharit , Hideki Nakajima","doi":"10.1016/j.conbuildmat.2025.141814","DOIUrl":null,"url":null,"abstract":"<div><div>The increasing demand for construction materials and the substantial carbon footprint associated with traditional cement highlight the urgent need for sustainable alternatives. Traditional geopolymers have shown promise due to their lower carbon emissions; however, their widespread application is often limited by the requirement for high-temperature curing. This study presents a modified method that employs microbially induced calcite precipitation (MICP) to synthesize sodium carbonate (Na<sub>2</sub>CO<sub>3</sub>). This approach addresses previous challenges related to ammonium byproducts and inadequate mechanical performance in construction materials. The synthesis of Na<sub>2</sub>CO<sub>3</sub> was optimized by adjusting the quantities of NaOH, the solution volume, alcohol-to-water ratios, and curing temperatures. Characterization techniques, including Scanning Electron Microscopy (SEM), Fourier-Transform Infrared Spectroscopy (FTIR), X-ray Fluorescence (XRF), and X-ray Diffraction (XRD), confirmed that the synthesized Na<sub>2</sub>CO<sub>3</sub> achieved commercial-grade purity. The synthesized Na<sub>2</sub>CO<sub>3</sub> was utilized to prepare geopolymer mortars activated using a 2 M Na<sub>2</sub>CO<sub>3</sub> solution combined with 5 % calcium hydroxide (Ca(OH)<sub>2</sub>), high-calcium fly ash, and sodium silicate (Na<sub>2</sub>SiO<sub>3</sub>) at a 1:1 ratio relative to Na<sub>2</sub>CO<sub>3</sub>. Under these optimized conditions, the resulting geopolymer mortar exhibited a compressive strength of 34 MPa after 28 days of ambient curing, demonstrating performance comparable to conventional cement-based mortars. Additional analyses using SEM, Energy Dispersive X-ray Spectroscopy (EDX), and X-ray Photoelectron Spectroscopy (XPS) confirmed the formation of N-A-S-H and C-A-S-H gels, along with progressive microstructural densification over time. This innovative integration of MICP and geopolymer technologies offers a sustainable, low-energy approach to reducing CO<sub>2</sub> emissions in the construction industry.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"484 ","pages":"Article 141814"},"PeriodicalIF":8.0000,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Development of low-temperature-curing geopolymers using optimized sodium carbonate from microbially induced calcite precipitation\",\"authors\":\"Nutthachai Prongmanee , Suksun Horpibulsuk , Rujira Pholtrai , Amorndech Noulmanee , Ruethaithip Dulyasucharit , Hideki Nakajima\",\"doi\":\"10.1016/j.conbuildmat.2025.141814\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The increasing demand for construction materials and the substantial carbon footprint associated with traditional cement highlight the urgent need for sustainable alternatives. Traditional geopolymers have shown promise due to their lower carbon emissions; however, their widespread application is often limited by the requirement for high-temperature curing. This study presents a modified method that employs microbially induced calcite precipitation (MICP) to synthesize sodium carbonate (Na<sub>2</sub>CO<sub>3</sub>). This approach addresses previous challenges related to ammonium byproducts and inadequate mechanical performance in construction materials. The synthesis of Na<sub>2</sub>CO<sub>3</sub> was optimized by adjusting the quantities of NaOH, the solution volume, alcohol-to-water ratios, and curing temperatures. Characterization techniques, including Scanning Electron Microscopy (SEM), Fourier-Transform Infrared Spectroscopy (FTIR), X-ray Fluorescence (XRF), and X-ray Diffraction (XRD), confirmed that the synthesized Na<sub>2</sub>CO<sub>3</sub> achieved commercial-grade purity. The synthesized Na<sub>2</sub>CO<sub>3</sub> was utilized to prepare geopolymer mortars activated using a 2 M Na<sub>2</sub>CO<sub>3</sub> solution combined with 5 % calcium hydroxide (Ca(OH)<sub>2</sub>), high-calcium fly ash, and sodium silicate (Na<sub>2</sub>SiO<sub>3</sub>) at a 1:1 ratio relative to Na<sub>2</sub>CO<sub>3</sub>. Under these optimized conditions, the resulting geopolymer mortar exhibited a compressive strength of 34 MPa after 28 days of ambient curing, demonstrating performance comparable to conventional cement-based mortars. Additional analyses using SEM, Energy Dispersive X-ray Spectroscopy (EDX), and X-ray Photoelectron Spectroscopy (XPS) confirmed the formation of N-A-S-H and C-A-S-H gels, along with progressive microstructural densification over time. This innovative integration of MICP and geopolymer technologies offers a sustainable, low-energy approach to reducing CO<sub>2</sub> emissions in the construction industry.</div></div>\",\"PeriodicalId\":288,\"journal\":{\"name\":\"Construction and Building Materials\",\"volume\":\"484 \",\"pages\":\"Article 141814\"},\"PeriodicalIF\":8.0000,\"publicationDate\":\"2025-05-19\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Construction and Building Materials\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0950061825019658\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CONSTRUCTION & BUILDING TECHNOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Construction and Building Materials","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0950061825019658","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
Development of low-temperature-curing geopolymers using optimized sodium carbonate from microbially induced calcite precipitation
The increasing demand for construction materials and the substantial carbon footprint associated with traditional cement highlight the urgent need for sustainable alternatives. Traditional geopolymers have shown promise due to their lower carbon emissions; however, their widespread application is often limited by the requirement for high-temperature curing. This study presents a modified method that employs microbially induced calcite precipitation (MICP) to synthesize sodium carbonate (Na2CO3). This approach addresses previous challenges related to ammonium byproducts and inadequate mechanical performance in construction materials. The synthesis of Na2CO3 was optimized by adjusting the quantities of NaOH, the solution volume, alcohol-to-water ratios, and curing temperatures. Characterization techniques, including Scanning Electron Microscopy (SEM), Fourier-Transform Infrared Spectroscopy (FTIR), X-ray Fluorescence (XRF), and X-ray Diffraction (XRD), confirmed that the synthesized Na2CO3 achieved commercial-grade purity. The synthesized Na2CO3 was utilized to prepare geopolymer mortars activated using a 2 M Na2CO3 solution combined with 5 % calcium hydroxide (Ca(OH)2), high-calcium fly ash, and sodium silicate (Na2SiO3) at a 1:1 ratio relative to Na2CO3. Under these optimized conditions, the resulting geopolymer mortar exhibited a compressive strength of 34 MPa after 28 days of ambient curing, demonstrating performance comparable to conventional cement-based mortars. Additional analyses using SEM, Energy Dispersive X-ray Spectroscopy (EDX), and X-ray Photoelectron Spectroscopy (XPS) confirmed the formation of N-A-S-H and C-A-S-H gels, along with progressive microstructural densification over time. This innovative integration of MICP and geopolymer technologies offers a sustainable, low-energy approach to reducing CO2 emissions in the construction industry.
期刊介绍:
Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged.
Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.