X-ray Diffraction-Based Quantification of Amorphous Phase in Alkali-Activated Blast Furnace Slag

IF 1.4 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Advances in Civil Engineering Materials Pub Date : 2021-07-07 DOI:10.1520/ACEM20200167
K. C. Reddy, K. Subramaniam
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引用次数: 1

Abstract

The X-ray diffraction (XRD) signature of the glassy phase in blast furnace slag undergoing alkaline dissolution is evaluated. The intensity signature of the glassy phase present in slag can consistently be decomposed into three underlying pseudo-Voigt (PV) peaks. It is shown that the fundamental underlying characteristics of the XRD signature of the undissolved glassy phase of slag in terms of the underlying PV peaks do not change after dissolution in an alkaline solution. The stability of the calcium ions depends on the [OH−] concentration in the solution. An intensity-based procedure is developed for quantifying the unreacted glassy phase content in alkali-activated slag. The XRD profile information of the glassy phase in raw slag is suitable for fitting the intensity profile of the dissolved glassy phase. The mass percentage of the unreacted glassy phase of slag within alkali-activated slag is validated with selective acid dissolution. A procedure for determining the degree of reaction in alkali-activated slag is established. The procedure developed here could be used to determine the activity of slag in an alkaline environment.
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基于x射线衍射的碱活化高炉炉渣非晶相定量研究
对碱溶后的高炉炉渣玻璃相进行了x射线衍射(XRD)表征。渣中存在的玻璃相强度特征可以一致地分解为三个潜在的伪voigt (PV)峰。结果表明,矿渣未溶解玻璃相的XRD特征在碱性溶液中溶解后,其下伏PV峰基本不变。钙离子的稳定性取决于溶液中[OH−]的浓度。开发了一种基于强度的方法来定量碱活性矿渣中未反应玻璃相的含量。原渣中玻璃相的XRD谱信息适合于拟合溶解玻璃相的强度谱。用选择性酸溶法测定了碱活化渣中未反应玻璃相的质量百分比。建立了测定碱渣反应度的方法。本方法可用于测定碱性环境下炉渣的活性。
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来源期刊
Advances in Civil Engineering Materials
Advances in Civil Engineering Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
2.70
自引率
7.10%
发文量
40
期刊介绍: The journal is published continuously in one annual issue online. Papers are published online as they are approved and edited. Special Issues may also be published on specific topics of interest to our readers. Advances in Civil Engineering Materials provides high-quality, papers on a broad range of topics relating to the properties and performance of civil engineering materials. Materials Covered: (but not limited to) Concrete, Asphalt, Steel, Polymers and polymeric composites, Wood, Other materials used in civil engineering applications (for example, pavements, bridges, and buildings, including nonstructural building elements such as insulation and roofing), and environmental systems (including water treatment). Core Topics Covered: Characterization, such as chemical composition, nanostructure, and microstructure, Physical properties, such as strength, stiffness, and fracture behavior, Constructability, such as construction methods, quality control/assurance, life cycle analysis, and sustainability, Durability. Papers may present experimental or modeling studies based on laboratory or field observations. Papers relating to sustainability of engineering materials or to the impact of materials on sustainability of engineering structures are especially encouraged.
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