通过碳化高剂量 Ca(OH)2 + 矿渣 + NaHCO3 (HCHSN) 水泥浆形成 CaCO3 基粘结剂

IF 7.2 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization Pub Date : 2024-10-26 DOI:10.1016/j.jcou.2024.102967

Yilin Zhao, Zanqun Liu, Jiahui Zhu, Yu Cui, Babar Iqbal

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引用次数: 0

摘要

通常情况下，碳化会导致碱活性水泥的 C-(A)-S-H 凝胶脱钙和力学性能下降。而在本研究中，我们提出了另一种形成 CaCO3 基粘结剂的可能性，即碳化高剂量 Ca(OH)2 (30 %) + 矿渣 (70 %) + NaHCO3（Ca(OH)2 和矿渣的重量比为 5.11 %）的碱激活矿渣水泥（HCHSN）。结果表明，HCHSN 水泥浆的抗压强度和体积稳定性可以通过碳化固化得到改善，碳化后的 HCHSN 水泥浆的最大抗压强度可达 32.4 MPa。根据 XRD、TGA、FTIR、1H NMR、BSE 和 SEM 的微观分析，碳化 HCHSN 水泥浆发展成为一种 CaCO3 基粘结剂，CaCO3 含量接近 60%（基于加热至 800℃的样品质量）。NaHCO3 在 CaCO3 型粘结剂的形成过程中发挥了关键作用，不仅加快了碳化速度，还促进了矿渣的碳化。生态效益评估表明，与碳化普通硅酸盐水泥产生 12.5 千克二氧化碳/兆帕/吨相比，碳化 HCHSN 水泥浆仅产生 3.5 千克二氧化碳/兆帕/吨，是一种非常绿色的 CaCO3 基胶凝材料。

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The formation of CaCO3-based binder by carbonating high-dosage Ca(OH)2 + slag + NaHCO3 (HCHSN) cement paste

Normally, carbonation can cause the decalcification of C-(A)-S-H gel of alkali-activated cement and the degradation of mechanical properties. While, we propose another possibility to form CaCO₃-based binder by carbonating the alkali-activated slag cement of high-dosage Ca(OH)₂ (30 %) + slag (70 %) + NaHCO₃ (5.11 % by weight of Ca(OH)₂ and slag) (HCHSN) in this study. The results supported that the compressive strength and volume stability of HCHSN cement paste can be improved by the carbonation curing and the carbonated HCHSN cement paste could reach a maximum compressive strength of 32.4 MPa. According to the micro-analysis of XRD, TGA, FTIR, ¹H NMR, BSE and SEM, the carbonated HCHSN cement paste was developed into a CaCO₃-based binder with a CaCO₃ content approaching 60 % (based on the mass of the samples heated to 800℃). NaHCO₃ played a key role in the formation of the CaCO₃-based binder, which not only accelerated the carbonation rate, but also promoted the carbonation of slag. The eco-efficiency assessment showed that compared to the production of 12.5 kg CO₂ /MPa/t from carbonated ordinary Portland cement, the carbonated HCHSN cement paste only produced 3.5 kg CO₂ /MPa/t, making it a very green CaCO₃-based cementitious materials.

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来源期刊

Journal of CO2 Utilization CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL

CiteScore

13.90

自引率

10.40%

发文量

406

审稿时长

2.8 months

期刊介绍： The Journal of CO2 Utilization offers a single, multi-disciplinary, scholarly platform for the exchange of novel research in the field of CO2 re-use for scientists and engineers in chemicals, fuels and materials. The emphasis is on the dissemination of leading-edge research from basic science to the development of new processes, technologies and applications. The Journal of CO2 Utilization publishes original peer-reviewed research papers, reviews, and short communications, including experimental and theoretical work, and analytical models and simulations.