From bauxite residue mineralogy to reactivity and properties of blended cements

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement and Concrete Research Pub Date : 2025-03-03 DOI:10.1016/j.cemconres.2025.107854

Michael Wenzel, Fabien Georget, Thomas Matschei

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Abstract

This paper reviews the efforts taken towards developing bauxite residue (BR) based blended cements (>30% substitution) contributing to the cement industry's net-zero targets, while utilizing the Bayer-processes by-product. We provide a comprehensive review of physical properties, element composition and mineralogy of Bayer and sintering BR. This defines the main challenges that BR based SCMs have to overcome to be utilized in sustainable blended cements. Several activation treatments and their impact on SCM characteristics and reactivity are introduced and compared to other reactive SCMs.

Furthermore, the review summarizes the impact of BR addition on the engineering performance of blended cements and includes selected durability issues. Our main goal is linking macroscopic observations to microstructural features of the binders and outlining a way towards a complete understanding of these blended cements. We outline specific knowledge gaps, in particular the effect of bauxite residues on the phase assemblage and microstructure of blended cements.

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从铝矾土残渣矿物学到混合水泥的反应性和特性

本文回顾了为开发基于铝矾土渣（BR）的混合水泥（30% 替代率）所做的努力，这些水泥在利用拜耳法副产品的同时，还为水泥行业的净零目标做出了贡献。我们对拜耳法和烧结拜耳法副产品的物理性质、元素组成和矿物学进行了全面回顾。这就确定了要在可持续混合水泥中使用基于 BR 的单体材料必须克服的主要挑战。此外，还介绍了几种活化处理方法及其对 SCM 特性和反应性的影响，并将其与其他反应性 SCM 进行了比较。我们的主要目标是将宏观观察结果与粘结剂的微观结构特征联系起来，并勾勒出全面了解这些混合水泥的途径。我们概述了具体的知识差距，特别是铝土矿残渣对混合水泥相组合和微观结构的影响。

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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.