Geopolymer Chemistry and Composition: A Comprehensive Review of Sustainable Construction

Strategic Insights -

Researchers at the University of South Wales have conducted a comprehensive review of geopolymer chemistry and composition, highlighting their potential for sustainable construction, waste valorization, and infrastructure resilience. The study emphasizes the use of low-calcium alkali-activated materials, which offer a significantly lower carbon footprint and superior durability compared to Ordinary Portland Cement. The researchers also discuss emerging applications of geopolymers in advanced pavements, offshore scour protection, and slow-release fertilizers, as well as their potential to contribute to the United Nations Sustainable Development Goals.

Key Takeaways:

  • Geopolymers are an environmentally sustainable class of low-calcium alkali-activated materials, distinct from high-calcium C-A-S-H gel systems, and offer a significantly lower carbon footprint compared to Ordinary Portland Cement.
  • The study highlights the use of geopolymers in advanced pavements, offshore scour protection, and slow-release fertilizers, as well as their potential to contribute to the United Nations Sustainable Development Goals.
  • The researchers emphasize the importance of aligning geopolymer technology with circular economy principles to guide sustainable construction, waste valorization, and infrastructure resilience.
  • Identified knowledge gaps include standardization of mix design, LCA-based evaluation of novel precursors, and variability management.
  • The study discusses the use of thermodynamic modeling and phase chemistry to improve precursor selection and mix design optimization.
  • Artificial Neural Network (ANN) and hybrid ML-thermodynamic approaches show promise for predictive performance assessment of geopolymers.
  • Comparative insights into alkali aluminosilicate (AAS) and aluminosilicate phosphate (ASP) systems are discussed alongside durability challenges, including alkali-silica reaction (ASR) and shrinkage.

Statistics:

  • Geopolymers offer a significantly lower carbon footprint compared to Ordinary Portland Cement (approximately 30% reduction)(1).
  • The use of geopolymers can valorize industrial by-products, such as fly ash, metakaolin, slag, waste glass, and coal gasification fly ash (CGFA)(2).
  • The study highlights the potential of geopolymers in contributing to the United Nations Sustainable Development Goals (SDGs), particularly Goal 9 (Industry, Innovation and Infrastructure) and Goal 12 (Responsible Consumption and Production)(3).

Sources:

(1) "Geopolymer Chemistry and Composition: A Comprehensive Review of Synthesis, Reaction Mechanisms, and Material Properties-Oriented with Sustainable Construction" (2025;18(16)).

(2) University of South Wales, Faculty of Computing, Engineering and Science (Pontypridd CF37 1DL, UK).

(3) United Nations, Sustainable Development Goals (SDGs).

(4) Materials, onlinelibrary.wiley.com/journal/10.1002/(ISSN)1521-4176.

(5) NewsRx, "New Sustainability Research Findings from University of South Wales Outlined (Geopolymer Chemistry and Composition: A Comprehensive Review of Synthesis, Reaction Mechanisms, and Material Properties-Oriented with Sustainable Construction)" (Ecology, Environment & Conservation. September 19, 2025; p 239).