水泥-生物炭复合材料的微观结构分析

IF 3.4 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Renata Lorenzoni, Patrick Cunningham, Tobias Fritsch, Wolfram Schmidt, Sabine Kruschwitz, Giovanni Bruno
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引用次数: 0

摘要

有人建议使用生物炭作为混凝土成分,以减少混凝土的大量碳足迹。由于生物炭密度低、孔隙率复杂,波特兰水泥-生物炭复合材料的微观结构分析具有挑战性。这给提高对生物炭复合材料行为的微观理解带来了挑战。这项研究通过应用汞侵入孔隙度法 (MIP)、气体吸附法、扫描电子显微镜和等温热流计 (HFC) 等常用表征技术,并结合 1H 核磁共振 (NMR) 和微 X 射线计算机断层扫描 (XCT) 分析技术,推进了对木质生物炭取代 0、5 和 25 体积百分比 (vol%) 水泥的波特兰水泥复合材料微观结构的理解。这些技术的结合可以对生物炭对水泥浆微观结构的影响进行多尺度研究。核磁共振和 XCT 技术可以观察和量化孔隙空间。HFC 和 MIP 证实生物炭能吸收水分并降低有效水灰比。气体吸附、MIP 和 NMR 显示,5% 的置换量不会对凝胶和毛细孔结构产生重大影响。XCT 的结果(得到 MIP 和 NMR 的支持)表明,生物炭可以减少较大孔隙的形成。重要的是,XCT 结果表明,生物炭可以作为微观结构的缺陷,这可以解释机械性能下降的原因。总体而言,文献中已经分析过的机械性能与观察到的微观结构变化是一致的,这些结果突出表明有必要仔细调整生物炭的体积分数,以控制其对浆料微观结构的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Microstructure analysis of cement-biochar composites

Microstructure analysis of cement-biochar composites

The use of biochar as a concrete constituent has been proposed to reduce the massive carbon footprint of concrete. Due to the low density and complex porosity of biochar, microstructural analysis of Portland cement-biochar composites is challenging. This causes challenges to the improvement of the micro-scale understanding of biochar composite behavior. This work advances the microstructural understanding of Portland cement composites with 0, 5, and 25 volume percent (vol%) of cement replaced with wood biochar by applying common characterization techniques of mercury intrusion porosimetry (MIP), gas sorption, scanning electron microscopy, and isothermal heat flow calorimetry (HFC) in conjunction with 1H nuclear magnetic resonance (NMR) and micro-X-ray computed tomography (XCT) analysis techniques. The combination of these techniques allows a multi-scale investigation of the effect of biochar on the microstructure of cement paste. NMR and XCT techniques allow the observation and quantification of the pore space. HFC and MIP confirmed that biochar absorbs moisture and reduces the effective water-cement ratio. Gas sorption, MIP, and NMR shows that 5 vol% replacement does not significantly affect the gel and capillary pore structures. Results from XCT (supported by MIP and NMR) show that biochar can reduce the formation of larger pores. Importantly, XCT results suggest that biochar can act as a flaw in the microstructure which could explain reductions in the mechanical properties. Overall, the mechanical properties already analyzed in the literature are consistent with the microstructural changes observed, and these results highlight the need to carefully tailor the volume fraction of biochar to control its effect on the paste microstructure.

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来源期刊
Materials and Structures
Materials and Structures 工程技术-材料科学:综合
CiteScore
6.40
自引率
7.90%
发文量
222
审稿时长
5.9 months
期刊介绍: Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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