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<p>Accelerated industrialization and urbanization have severely increased the consumption of cement and natural sand in construction, so it is of great significance to find suitable, green, and sustainable alternative materials to protect the ecological environment and promote sustainable development in the construction field. In this work, sustainable geopolymer mortar was fabricated by mixing manufactured sand prepared from limestone with the precursor consisting of fly ash (FA), metakaolin (MK) and the alkali-activator solution composed of NaOH and Na<sub>2</sub>SiO<sub>3</sub> solution by the polymerization reaction. Besides, the influence of FA dosage (15%, 20%, 25%, 30%, and 35% wt%) on the mechanical performance and durability of sustainable geopolymer mortars containing 100% manufactured sand was evaluated. Compressive, tensile, and flexural test, elastic modulus test, anti-permeability test, and crack resistance test were performed on the sustainable geopolymer mortars after 28&#xa0;days of curing. The experimental results indicated that the FA dosage had a statistically significant influence on the durability and mechanical performance of the sustainable geopolymer mortars. Incrementally elevating the FA content in the sustainable geopolymer mortar incorporating manufactured sand enhanced both its mechanical properties and durability, with 35% delivering the optimal overall performance. A damage model for sustainable geopolymer mortar was proposed based on the available data, a linear function fitting model of compressive strength of sustainable geopolymer mortars with tensile and flexural strength, modulus of elasticity, anti-permeability, and crack resistance was developed based on the experimental data. Furthermore, the statistical effects of FA amount on various properties of sustainable geopolymer mortars at a significance level of 0.025 were analyzed by statistical analysis. The findings of this work provide a parametric reference for the study of the precursor of sustainable geopolymer mortar and offer critical information about geopolymer mortar containing manufactured sand used in practical engineering.</p>

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Mechanical properties and durability of sustainable geopolymer mortar containing manufactured sand: effect of fly ash addition

  • 期刊论文

  • 发表日期：

    2026年2月28日

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  • Peng Zhang,
  • Cong Wang,
  • Jian Hong,
  • Zhenhui Guo,
  • Peng Yuan

摘要

Accelerated industrialization and urbanization have severely increased the consumption of cement and natural sand in construction, so it is of great significance to find suitable, green, and sustainable alternative materials to protect the ecological environment and promote sustainable development in the construction field. In this work, sustainable geopolymer mortar was fabricated by mixing manufactured sand prepared from limestone with the precursor consisting of fly ash (FA), metakaolin (MK) and the alkali-activator solution composed of NaOH and Na2SiO3 solution by the polymerization reaction. Besides, the influence of FA dosage (15%, 20%, 25%, 30%, and 35% wt%) on the mechanical performance and durability of sustainable geopolymer mortars containing 100% manufactured sand was evaluated. Compressive, tensile, and flexural test, elastic modulus test, anti-permeability test, and crack resistance test were performed on the sustainable geopolymer mortars after 28 days of curing. The experimental results indicated that the FA dosage had a statistically significant influence on the durability and mechanical performance of the sustainable geopolymer mortars. Incrementally elevating the FA content in the sustainable geopolymer mortar incorporating manufactured sand enhanced both its mechanical properties and durability, with 35% delivering the optimal overall performance. A damage model for sustainable geopolymer mortar was proposed based on the available data, a linear function fitting model of compressive strength of sustainable geopolymer mortars with tensile and flexural strength, modulus of elasticity, anti-permeability, and crack resistance was developed based on the experimental data. Furthermore, the statistical effects of FA amount on various properties of sustainable geopolymer mortars at a significance level of 0.025 were analyzed by statistical analysis. The findings of this work provide a parametric reference for the study of the precursor of sustainable geopolymer mortar and offer critical information about geopolymer mortar containing manufactured sand used in practical engineering.