Effect of the Al content and the Ca/Si ratio on the structure and reactivity of calcium aluminosilicate glasses used as model SCMs

IF 14 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2026-01-01 Epub Date: 2025-10-23 DOI:10.1016/j.cemconres.2025.108066

Luis Schnürer, Henrik Eickhoff, Harald Hilbig, Alisa Machner

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Abstract

Since the reactivity of SCMs is affected by different specific properties, it is crucial to understand their impact. This study, therefore, focuses on how the Al content and Ca/Si ratio affect the structure and reactivity of calcium aluminosilicate glasses. The glasses were synthesized amorphous in 2 series with Al contents ranging from 5 to 40 wt% (Ca/Si mass ratio = 1:1) and Ca/Si ratios ranging from 0.21 to 1.00 (Al₂O₃ content = 15 wt%). Structural analysis by FTIR, ²⁷Al and ²⁹Si MAS NMR, and theoretical NBO/T calculations showed an increasing degree of polymerization with increasing Al content or decreasing Ca/Si ratio. The reactivity, examined by the R³ test and in cement pastes, was less affected by the degree of polymerization but more by the Al content. These findings provide insights into the dependence of structure and composition on the reactivity of model SCMs that may help in the search for new SCM sources in the future.

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Al含量和Ca/Si比对铝硅酸盐钙玻璃结构和反应性的影响

由于scm的反应性受到不同特定性质的影响，因此了解它们的影响至关重要。因此，本研究的重点是Al含量和Ca/Si比如何影响钙铝硅酸盐玻璃的结构和反应性。铝含量为5 ~ 40 wt% (Ca/Si质量比为1:1)，Ca/Si质量比为0.21 ~ 1.00 （Al2O3含量为15 wt%）。FTIR、27Al和29Si的MAS NMR结构分析以及理论NBO/T计算表明，随着Al含量的增加或Ca/Si比的降低，聚合度增加。通过R3测试和水泥浆的反应性，聚合程度对反应性的影响较小，而Al含量对反应性的影响较大。这些发现提供了对模型SCM的结构和组成对反应性的依赖性的见解，这可能有助于在未来寻找新的SCM来源。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.