Study of mortars with total replacement of electric arc furnace slag aggregates carbonated by aqueous processes

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-10-11 DOI:10.1016/j.conbuildmat.2025.143890

M. Bustamante , J. Muñoz , P. Muñoz , V. Letelier

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Abstract

The electric arc furnace (EAF) slag, generated from an alternative steel production route with lower carbon emissions, is projected as a by-product with increasing availability. This study investigated the feasibility of incorporating EAF slag aggregates carbonated by aqueous (EAF-A) and semi-aqueous (EAF-S) processes as full replacements for natural aggregates in Portland cement mortars, with the aim of evaluating their viability as a raw material in cementitious materials, with a view to enhancing their valorisation. Physical, mechanical, and microstructural properties of the mortars were assessed using thermogravimetric analysis, X-ray diffraction, ultrasonic pulse velocity (UPV), and capillary absorption tests. Results showed that mortars incorporating EAF-S aggregates exhibited superior workability and significantly higher compressive strength at 28 days, exceeding 35 MPa and outperforming both the control and EAF-A series. In contrast, EAF-A aggregates did not consistently improve mechanical strength. Microstructural analysis revealed increased formation of amorphous silica, C–S–H gels, and portlandite in mortars containing carbonated EAF aggregates compared to the control. These findings emphasise that the type of carbonation treatment critically influences the internal structure and performance of mortars, supporting the viability of semi-aqueous carbonated EAF aggregates for sustainable construction applications.

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全替代电弧炉渣水法碳化骨料砂浆的研究

电弧炉（EAF）炉渣是一种碳排放量较低的替代钢铁生产路线产生的，预计将作为一种日益可用的副产品。本研究调查了掺入经水（EAF- a）和半水（EAF- s）工艺碳化的EAF矿渣骨料作为波特兰水泥砂浆中天然骨料的完全替代品的可行性，目的是评估其作为胶凝材料原材料的可行性，以提高其价值。通过热重分析、x射线衍射、超声脉冲速度（UPV）和毛细管吸收测试来评估砂浆的物理、机械和微观结构性能。结果表明，掺入EAF-S骨料的砂浆具有较好的和易性，28 d抗压强度显著提高，超过35 MPa，优于对照和EAF-A系列；相反，EAF-A骨料并没有持续提高机械强度。微观结构分析显示，与对照组相比，含有碳化EAF聚集体的砂浆中无定形二氧化硅、C-S-H凝胶和波特兰石的形成增加。这些发现强调，碳化处理的类型严重影响砂浆的内部结构和性能，支持半水碳酸化EAF骨料在可持续建筑应用中的可行性。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.