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<p>Ferroaluminate cement (FAC), characterized by low CO<sub>2</sub> 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&#xa0;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 C<sub>3</sub>A/C<sub>3</sub>S 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&#xa0;day compressive strength, respectively. This was mainly caused by the reduction in formation of AH<sub>3</sub> and C<sub>2</sub>ASH<sub>8</sub> in the hydration products of FAC with GGBS/FA. Besides, FA promoted ettringite crystallization but introduced unreacted particles, while GGBS increased pore connectivity.</p>

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

  • 期刊论文

  • 发表日期：

    2025年6月25日

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

摘要

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.