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<p>Seawater and sea sand geopolymer concrete (SWSSGC) is a low-carbon and environmentally friendly concrete material that can reduce the use of Portland cement as well as the consumption of freshwater and river sand resources. Research on the mechanical properties and stress-strain behavior of SWSSGC enables better prediction of structural responses and assessment of safety and reliability. This paper employs the Response Surface Methodology (RSM) to conduct compression tests on SWSSGC, considering variations in fly ash ratio, aggregate-to-binder ratio, and water-to-binder ratio. Combined with Digital Image Correlation (DIC) technology, it investigates the axial compressive strength (<i>f</i><sub><i>c</i></sub>), cubic compressive strength (<i>f</i><sub><i>cu</i></sub>), peak strain (<i>ε</i><sub><i>0,v</i></sub>), elastic modulus (<i>E</i><sub><i>c</i></sub>), toughness (<i>T</i>), and full stress-strain model. The failure modes and crack propagation paths of SWSSGC were obtained. Computational models for <i>f</i><sub><i>c</i></sub>, <i>f</i><sub><i>cu</i></sub>, <i>ε</i><sub><i>0,v</i></sub>, <i>E</i><sub><i>c</i></sub>, and <i>T</i> of SWSSGC based on the response surface method were proposed, and interdependent models for these performance indicators were derived. Building upon classical constitutive models, a constitutive model for SWSSGC considering the influence of fly ash ratio was proposed. Results indicate that SWSSGC failure involves four distinct stages. Increasing fly ash ratio reduces <i>f</i><sub><i>c</i></sub>, <i>f</i><sub><i>cu</i></sub>, and <i>E</i><sub><i>c</i></sub> by 18.26%, 17.36%, and 34.7%, respectively, while <i>ε</i><sub><i>0,v</i></sub> increases by 19.5%. while <i>T</i> first increased and then decreased. Increasing the water-to-binder ratio reduced <i>f</i><sub><i>c</i></sub>, <i>f</i><sub><i>cu</i></sub>, and <i>E</i><sub><i>c</i></sub> by 20.26%, 19.37%, and 19.64%, respectively, while <i>ε</i><sub><i>0,v</i></sub> increased by 39.78%. The performance models and interrelationship models based on the response surface method showed good fitting results. Stress-strain behavior tested using DIC technology closely matched results from traditional methods, with R² values reaching 0.88. The constitutive model considering fly ash ratio effectively predicted the uniaxial compression behavior of SWSSGC.</p>

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Uniaxial compressive stress-strain behavior of cleaner geopolymer seawater sea sand concrete based on DIC technique

  • 期刊论文

  • 发表日期：

    2026年5月21日

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  • Hao Chen,
  • Xiang Liu,
  • Wei Zhang,
  • Zhicheng Pan

摘要

Seawater and sea sand geopolymer concrete (SWSSGC) is a low-carbon and environmentally friendly concrete material that can reduce the use of Portland cement as well as the consumption of freshwater and river sand resources. Research on the mechanical properties and stress-strain behavior of SWSSGC enables better prediction of structural responses and assessment of safety and reliability. This paper employs the Response Surface Methodology (RSM) to conduct compression tests on SWSSGC, considering variations in fly ash ratio, aggregate-to-binder ratio, and water-to-binder ratio. Combined with Digital Image Correlation (DIC) technology, it investigates the axial compressive strength (fc), cubic compressive strength (fcu), peak strain (ε0,v), elastic modulus (Ec), toughness (T), and full stress-strain model. The failure modes and crack propagation paths of SWSSGC were obtained. Computational models for fc, fcu, ε0,v, Ec, and T of SWSSGC based on the response surface method were proposed, and interdependent models for these performance indicators were derived. Building upon classical constitutive models, a constitutive model for SWSSGC considering the influence of fly ash ratio was proposed. Results indicate that SWSSGC failure involves four distinct stages. Increasing fly ash ratio reduces fc, fcu, and Ec by 18.26%, 17.36%, and 34.7%, respectively, while ε0,v increases by 19.5%. while T first increased and then decreased. Increasing the water-to-binder ratio reduced fc, fcu, and Ec by 20.26%, 19.37%, and 19.64%, respectively, while ε0,v increased by 39.78%. The performance models and interrelationship models based on the response surface method showed good fitting results. Stress-strain behavior tested using DIC technology closely matched results from traditional methods, with R² values reaching 0.88. The constitutive model considering fly ash ratio effectively predicted the uniaxial compression behavior of SWSSGC.