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

IF 8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Nutthachai Prongmanee , Suksun Horpibulsuk , Rujira Pholtrai , Amorndech Noulmanee , Ruethaithip Dulyasucharit , Hideki Nakajima
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引用次数: 0

摘要

对建筑材料的需求不断增长以及与传统水泥相关的大量碳足迹突出了对可持续替代品的迫切需求。传统的地聚合物因其较低的碳排放而显示出前景;然而,它们的广泛应用往往受到高温固化要求的限制。提出了一种利用微生物诱导方解石沉淀(MICP)合成碳酸钠(Na2CO3)的改进方法。这种方法解决了先前有关铵副产物和建筑材料机械性能不足的挑战。通过调整NaOH用量、溶液体积、醇水比和固化温度,优化了Na2CO3的合成。表征技术,包括扫描电子显微镜(SEM)、傅里叶变换红外光谱(FTIR)、x射线荧光(XRF)和x射线衍射(XRD),证实合成的Na2CO3达到了商业级纯度。将合成的Na2CO3以2 M的Na2CO3溶液与5 %的氢氧化钙(Ca(OH)2)、高钙粉煤灰和水玻璃(Na2SiO3)按1:1的比例混合,制备地聚合物砂浆。在这些优化条件下,经过28天的环境养护,得到的地聚合物砂浆的抗压强度为34 MPa,其性能与传统水泥基砂浆相当。利用扫描电镜(SEM)、能量色散x射线能谱(EDX)和x射线光电子能谱(XPS)进行的进一步分析证实了N-A-S-H和C-A-S-H凝胶的形成,以及随着时间的推移,微观结构致密化的进展。这种MICP和地聚合物技术的创新集成为减少建筑行业的二氧化碳排放提供了一种可持续的低能耗方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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.
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来源期刊
Construction and Building Materials
Construction and Building Materials 工程技术-材料科学:综合
CiteScore
13.80
自引率
21.60%
发文量
3632
审稿时长
82 days
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.
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