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<p>This study optimized the mix proportion of red mud manufactured sand foam concrete (RMMSFC) using orthogonal tests and evaluated its sulfate resistance. Results showed that the sand-cement ratio most significantly influenced dry density and porosity, while foam content predominantly governed strength. Through range analysis, variance analysis, and comprehensive scoring, the optimal mix was determined as water-cement ratio 0.27, red mud content 30%, sand-cement ratio 0.9, and foam content 8%, achieving a 28-day compressive strength of 18.79&#xa0;MPa and dry density of 1724.50&#xa0;kg/m³. Microstructural analysis indicated that active components in red mud participated in secondary hydration, producing C-S-H gel and ettringite, thereby refining pore structure. Sulfate resistance tests revealed that specimens with ≤ 30% red mud retained good integrity after 50 wet-dry cycles. When the content of red mud is over 30%, the comprehensive performance decreases significantly due to the accelerated decomposition of hydration products and the expansion and accumulation of erosion products in the high alkali environment.</p>

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Mix proportion optimization of red mud manufactured sand foam concrete and its sulfate resistance

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月19日

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  • Junnan Wu,
  • Chuandong Ren,
  • Yingli Zhang,
  • Fuchao Xu

摘要

This study optimized the mix proportion of red mud manufactured sand foam concrete (RMMSFC) using orthogonal tests and evaluated its sulfate resistance. Results showed that the sand-cement ratio most significantly influenced dry density and porosity, while foam content predominantly governed strength. Through range analysis, variance analysis, and comprehensive scoring, the optimal mix was determined as water-cement ratio 0.27, red mud content 30%, sand-cement ratio 0.9, and foam content 8%, achieving a 28-day compressive strength of 18.79 MPa and dry density of 1724.50 kg/m³. Microstructural analysis indicated that active components in red mud participated in secondary hydration, producing C-S-H gel and ettringite, thereby refining pore structure. Sulfate resistance tests revealed that specimens with ≤ 30% red mud retained good integrity after 50 wet-dry cycles. When the content of red mud is over 30%, the comprehensive performance decreases significantly due to the accelerated decomposition of hydration products and the expansion and accumulation of erosion products in the high alkali environment.