新型水合碳酸镁--含醋酸盐的 giorgiosite 的合成与热力学数据

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-04-21 DOI:10.1016/j.cemconres.2025.107902

Hoang Nguyen , Ellina Bernard , Frank Winnefeld , Barbara Lothenbach , Paivo Kinnunen

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引用次数: 0

摘要

有机添加剂在促进氧化镁基水泥中碳酸镁的形成和反应动力学方面发挥着重要作用。然而，人们对有机物对碳酸盐相形成途径的影响以及是否存在有机改性碳酸镁知之甚少。我们发现醋酸盐可参与形成一种新的含醋酸盐的水合碳酸镁相：[Mg5(CO3)3.25(OH)2(CH3COO)1.5·5H2O].在这项工作中，我们首次报告了该相的溶度积（log Ks0），同时还重新计算了艺术石的 log Ks0。这种含醋酸盐的 giorgiosite 在低温下相当稳定，但在 20 °C时观察到了芒硝[Mg2(OH)2(CO3)(H2O)3]和无定形碳酸镁，而在 50 和 80 °C时则出现了水镁石[Mg5(CO3)4(OH)2-4H2O]、水合碳酸盐青金石（HCB）和无定形碳酸镁。这项研究发现了使用有机添加剂引导碳酸盐反应和形成的潜力，从而提高氧化镁基水泥中碳利用和反应的效率。

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Synthesis and thermodynamic data of acetate-containing giorgiosite – a novel hydrated magnesium carbonate

Organic additives play important roles in enhancing the formation of Mg‑carbonates and reaction kinetics in MgO-based cements. However, little is known about the influences of organics on the formation pathways of carbonate phases and whether organo-modified Mg‑carbonates exist. We found that acetate can be involved in the formation of a new hydrated magnesium carbonate phase containing acetate: [Mg₅(CO₃)_3.25(OH)₂(CH₃COO)_1.5·5H₂O]. In this work, the solubility product (log K_s0) of this phase was reported for the first time, while we also re-calculated the log K_s0 of artinite. This acetate-containing giorgiosite is rather stable at low temperature but artinite [Mg₂(OH)₂(CO₃)(H₂O)₃] and amorphous magnesium carbonates were observed at 20 °C while hydromagnesite [Mg₅(CO₃)₄(OH)₂·4H₂O], hydrated carbonate brucite (HCB) and amorphous magnesium carbonates were present at 50 and 80 °C. The work enables the potential of using organic additives in steering the reaction and formation of carbonates for better efficacy of carbon utilization and reactions in MgO-based cements.

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.