An experimental and computational study to resolve the composition of dolomitic lime

An experimental and computational study to resolve the composition of dolomitic lime
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解析白云石石灰成分的实验和计算研究

DOI:
10.1039/c5ra25451e
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发表时间:
2016
期刊:
影响因子:
3.9
通讯作者:
Grant J
Grant J
中科院分区:
化学3区
文献类型:
--
作者:
Grant J

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降低对环境的影响,摆脱对水泥基粘合剂的依赖,是建筑行业面临的一个关键挑战。白云石石灰结合料在比水泥更低的温度下生产,在强化过程中重新吸附释放的CO2,并因其上级渗透性,柔韧性和弹性而被认可。虽然白云石由镁和钙的交替层组成,但在石灰石中的分布尚未完全了解。在这里,我们联合收割机实验和计算方法,以确认白云石相分离成石灰和方镁石在热分解过程中。分解白云石的拉曼不活动与XRD研究一致,表明相分离。我们的研究结果排除了混合相氧化物的形成,并预测体和表面的替代缺陷浓度的上限。转移到研究石灰砂浆的宏观模型,这些研究结果表明,只有纯相需要考虑,并为建筑工业上级人工砂浆应获得混合纯镁和氢氧化钙的细粉。
Lowering the environmental impact, and moving away from a reliance on cement based binders, is a key challenge of the construction industry. Dolomitic lime binders are produced at lower temperatures than cement, re-adsorb released CO2 during strengthening, and are recognised for their superior permeability, flexibility and resilience. While dolomite consists of alternating layers of magnesium and calcium the distribution in dolomitic lime is not yet fully understood. Here we combine experimental and computational methods to confirm that dolomite phase separates into lime and periclase during thermal decomposition. Raman inactivity of decomposed dolomite agrees with XRD studies suggesting phase separation. Our results rule out the formation of mixed phase oxides and predict an upper bound for bulk and surface substitution defect concentrations. Transferred to study macroscopic models of lime mortars these findings indicate that only the pure phases need be considered and that for the construction industry superior artificial mortars should be obtained from mixing fine powders of pure magnesium and calcium hydroxide.
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发表时间: 2016
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