不同二氧化碳浓度下 γ-C2S 和氧化镁固化行为的研究

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-16 DOI:10.1016/j.conbuildmat.2024.139176

Chen Zhang, Xuemao Guan, Jianping Zhu, Songhui Liu, Ruiqi Zhao

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引用次数: 0

摘要

该研究调查了在 10% 和 100% CO2 浓度下固化的 MgO-γ-C2S 的机械性能和微观结构演变。结果表明，随着二氧化碳浓度从 10% 增加到 100%，碳酸盐相表现出更强的抗压强度。MgO-γ-C2S 样品抗压强度的发展与碳化产生的碳酸盐含量直接相关。在二氧化碳浓度为 10 % 的情况下碳化 8 小时的样品的抗压强度与在二氧化碳浓度为 100 % 的情况下碳化 4 小时的样品的抗压强度相当，这突出表明了使用较低浓度的潜力。此外，二氧化碳优先吸附在 γ-C2S (101) 和氧化镁 (010) 的表面。在 γ-C2S (101) 表面观察到大量电荷从表面 Ca 离子转移到 CO2 分子的反键轨道，揭示了原子尺度的碳化行为。这项研究为含 γ-C2S 和氧化镁的工业固体废弃物以及工业烟气在建材工业中的应用提供了理论指导。

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Investigation of curing behavior of γ-C2S and MgO under varying CO2 concentrations

The study investigated the mechanical properties and microstructure evolution of MgO-γ-C₂S solidified under 10 % and 100 % CO₂ concentrations. The results suggest that the carbonate phase exhibits enhanced compressive strength as the CO₂ concentration increases from 10 % to 100 %. The development of compressive strength in MgO-γ-C₂S samples is directly correlated with the carbonate content generated by carbonation. The compressive strength of samples carbonated for 8 h at a 10 % CO₂ concentration is equivalent to that of samples carbonated for 4 h at a 100 % CO₂ concentration, highlighting the potential of using lower concentrations. Additionally, CO₂ preferentially adsorbs on the surfaces of γ-C₂S (101) and MgO (010). A significant amount of charge transfer from surface Ca ions to the anti-bonding orbitals of CO₂ molecules is observed on the γ-C₂S (101) surface, revealing the carbonation behavior at the atomic scale. This study provides theoretical guidance for the application of industrial solid waste containing γ-C₂S and MgO, as well as industrial flue gas, in the building materials industry.

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来源期刊

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.