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Green Protective Geopolymer Coatings: Interface Characterization, Modification and Life-Cycle Analysis.

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Low-carbon geopolymer coatings enhance infrastructure durability and lifespan. This study found geopolymer coatings offer significant environmental benefits over ordinary Portland cement, especially slag-based formulations.

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Area of Science:

  • Materials Science
  • Environmental Science
  • Civil Engineering

Background:

  • Construction industry faces resource and environmental challenges.
  • Geopolymer coatings offer a durable, low-carbon alternative for infrastructure protection.
  • Extending infrastructure service life is crucial for sustainability.

Purpose of the Study:

  • Assess the protective performance and environmental impacts of geopolymer coatings.
  • Investigate the influence of various parameters on geopolymer coating properties.
  • Compare the environmental footprint of geopolymer coatings with ordinary Portland cement (OPC).

Main Methods:

  • Investigated effects of main substance, water-solid ratio, activator type, and curing time.
  • Analyzed interface characteristics: contact angle, surface energy, mechanical properties, and microstructure.
  • Conducted life-cycle analysis (LCA) for environmental impact assessment.

Main Results:

  • Geopolymer parameters had minimal effect on hydrophilic functional groups.
  • Organic surface modifiers, particularly silicon-based, created hydrophobic surfaces and enhanced durability.
  • Silicon-based modifiers outperformed capillary crystalline surfactants.
  • Geopolymer coatings showed 50-80% lower environmental impacts than OPC coatings.
  • Slag-based geopolymers had lower environmental impacts than FA-based and MK-based varieties.

Conclusions:

  • Geopolymer coatings provide a sustainable and durable solution for infrastructure.
  • Silicon-based modifiers are effective for enhancing geopolymer hydrophobicity and durability.
  • Geopolymer coatings offer substantial environmental advantages over OPC, with slag-based formulations being the most eco-friendly.