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<p>The Portland cement manufacturing process is energy-intensive, contributing 8–10% of global CO<sub>2</sub> emissions. Fly ash-slag-based geopolymers, which use industrial by-products, offer a promising alternative with lower environmental impact and high mechanical properties. This study investigates the effect of sodium silicate and sodium hydroxide on compressive strength in fly ash-slag-based geopolymer concrete with varying mix ratios and moduli. A total of 447 samples were analyzed using seven regression techniques. The Artificial Neural Network (ANN) model outperformed others, followed by the M5P tree model. Sensitivity analysis revealed that sodium silicate, sodium hydroxide, hydraulic modulus, and alumina modulus were critical for predicting compressive strength. The results demonstrate the potential of fly ash-slag-based geopolymers as a sustainable alternative to Portland cement, warranting further research for more eco-friendly concrete mixes in construction.</p>

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Evaluating the compressive strength of fly ash-slag-based geopolymer concrete: impact of hydraulic, silica, alumina, and lime moduli, and sodium silicate using various predictive models

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • Baqer Thamer Baqer,
  • Ahmed Salih Mohammed

摘要

The Portland cement manufacturing process is energy-intensive, contributing 8–10% of global CO2 emissions. Fly ash-slag-based geopolymers, which use industrial by-products, offer a promising alternative with lower environmental impact and high mechanical properties. This study investigates the effect of sodium silicate and sodium hydroxide on compressive strength in fly ash-slag-based geopolymer concrete with varying mix ratios and moduli. A total of 447 samples were analyzed using seven regression techniques. The Artificial Neural Network (ANN) model outperformed others, followed by the M5P tree model. Sensitivity analysis revealed that sodium silicate, sodium hydroxide, hydraulic modulus, and alumina modulus were critical for predicting compressive strength. The results demonstrate the potential of fly ash-slag-based geopolymers as a sustainable alternative to Portland cement, warranting further research for more eco-friendly concrete mixes in construction.