开发高强度和二氧化碳封存泡沫混凝土

IF 7.1 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Dingqiang Fan, Chunpeng Zhang, Xiaosheng Li, Xuesen Lv, Jian-Xin Lu, Rui Yu, Takafumi Noguchi, Chi Sun Poon
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引用次数: 0

摘要

过量的二氧化碳排放给环境带来了重大挑战。本研究开发了碳化增强型高强度泡沫混凝土(HSFC),以最大限度地封存和利用二氧化碳。在设计的致密浆料基体中加入细小而稳定的泡沫,然后进行碳化增强,就制成了 HSFC。微观和宏观测试表明,HSFC 的二氧化碳吸收能力高达 12.6 wt %(每立方米混凝土可吸收 ∼ 90 千克二氧化碳)。在低水胶比(W/B)系统中,碳化养护消耗了氢氧化钙、硅酸钙水合物(CSH)凝胶和未水化水泥,产生了大量碳酸钙(CC),有三种形态:无定形钙、方解石(主要)和文石(碳化水平较高)。值得注意的是,碳化过程通过填充微孔使基体微硬度略有增加,孔隙率降低了 19.8%。在泡沫孔壁上生成的 CC 细化了孔径,进一步提高了 HSFC 的抗压强度,在密度相似的情况下,HSFC 的抗压强度几乎是传统泡沫混凝土的两倍。碳化养护也提高了耐久性,减少了吸水性,增加了电阻。最后,还提出了具有显著环境效益的高性能 HSFC 制造策略,为可持续建筑实践做出了贡献。
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 Foam Concrete toward High Strength and CO2 Sequestration

Development of Foam Concrete toward High Strength and CO2 Sequestration
Excessive CO2 emissions present major environmental challenges. This study developed carbonation-enhanced high-strength foam concrete (HSFC) to maximize the CO2 sequestration and utilization. HSFC was produced by incorporating a fine and stable foam into a designed dense paste matrix, followed by carbonation enhancement. Micro and macro tests revealed that HSFC achieved a notable CO2 uptake capacity of up to 12.6 wt % (∼90 kg of CO2 per m3 of concrete). In the low water-to-binder (W/B) ratio system, carbonation curing consumed calcium hydroxide, calcium silicate hydrate (CSH) gel, and unhydrated cement, producing substantial amounts of calcium carbonates (CCs) in three forms: amorphous, calcite (predominant), and aragonite (at higher carbonation levels). Notably, the carbonation process slightly increased the matrix microhardness by filling micropores and reducing porosity by 19.8%. The generation of CCs on foam pore walls refined the pore size, further enhancing HSFC compressive strength to nearly double that of conventional foam concrete at a similar density. Carbonation curing also improved durability, reducing water absorption and increasing electrical resistance. Finally, strategies for fabricating high-performance HSFC with significant environmental benefits were proposed, contributing to sustainable construction practices.
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来源期刊
ACS Sustainable Chemistry & Engineering
ACS Sustainable Chemistry & Engineering CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL
CiteScore
13.80
自引率
4.80%
发文量
1470
审稿时长
1.7 months
期刊介绍: ACS Sustainable Chemistry & Engineering is a prestigious weekly peer-reviewed scientific journal published by the American Chemical Society. Dedicated to advancing the principles of green chemistry and green engineering, it covers a wide array of research topics including green chemistry, green engineering, biomass, alternative energy, and life cycle assessment. The journal welcomes submissions in various formats, including Letters, Articles, Features, and Perspectives (Reviews), that address the challenges of sustainability in the chemical enterprise and contribute to the advancement of sustainable practices. Join us in shaping the future of sustainable chemistry and engineering.
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