Effect of GGBS and fly ash on the microstructure, mechanical properties, and hydration of ferroaluminate cement

IF 3.9 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2025-06-25 DOI:10.1617/s11527-025-02711-z

Pu Zhang, Xinze Chen, Dongyou Qi, Huizhong Li, Zhiyong Wang, Youyi Chen, Ganglian Hou, Dong Zhang

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Abstract

Ferroaluminate cement (FAC), characterized by low CO₂ emissions and enhanced durability due to iron-phase minerals, has emerged as a sustainable alternative to ordinary Portland cement (OPC). However, the influence of supplementary cementitious materials (SCMs) on the performance of FAC remains unclear. This study systematically investigated the effects of granulated blast furnace slag (GGBS) and fly ash (FA) at replacement ratios of 10, 20, and 30% on the workability, mechanical properties, and hydration mechanisms of FAC mortar. Results demonstrated that FAC exhibited a slightly lower water demand and about ~ 25 and 36% shorter initial and final setting time compared to OPC, attributed to the absence of C₃A/C₃S and rapid AFt formation. GGBS and FA could accelerate hydration of FAC and reduce the initial setting time by 26–76%, depending on the replacing ratio. However, the compressive strength of FAC significantly decreased with increasing amount of GGBS and FA. 30% replacement of GGBS and FA caused a 19.5% and 24.8% in 28 day compressive strength, respectively. This was mainly caused by the reduction in formation of AH₃ and C₂ASH₈ in the hydration products of FAC with GGBS/FA. Besides, FA promoted ettringite crystallization but introduced unreacted particles, while GGBS increased pore connectivity.

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GGBS和粉煤灰对铝酸铁水泥微观结构、力学性能和水化性能的影响

铝酸铁水泥（FAC）的特点是二氧化碳排放量低，并且由于含有铁相矿物而增强了耐久性，已成为普通硅酸盐水泥（OPC）的可持续替代品。然而，补充胶凝材料（SCMs）对FAC性能的影响尚不清楚。本研究系统研究了矿渣（GGBS）和粉煤灰（FA）在10%、20%和30%的替代比例下对FAC砂浆的和易性、力学性能和水化机理的影响。结果表明，与OPC相比，FAC的需水量略低，初始和最终凝结时间分别缩短了约25%和36%，这是由于缺乏C3A/C3S和快速的AFt形成。GGBS和FA可加速FAC的水化，减少初始凝结时间26-76%。然而，随着GGBS和FA用量的增加，FAC的抗压强度显著降低。GGBS和FA置换30%对28天抗压强度的影响分别为19.5%和24.8%。这主要是由于GGBS/FA减少了FAC水化产物中AH3和C2ASH8的生成。此外，FA促进了钙矾石结晶，但引入了未反应颗粒，而GGBS增加了孔隙连通性。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.