Sustainable Cementitious Materials in Concrete Applications

The production of Portland cement accounts for a significant proportion of global CO₂ emissions, driving research into sustainable alternatives that reduce carbon footprint without compromising performance. Sustainable cementitious materials encompass a range of industrial by-products and natural pozzolans—such as fly ash, blast-furnace slag, silica fume, rice husk ash and palm oil fuel ash—that can partially or wholly substitute clinker in concrete. Beyond waste valorisation, these materials often enhance long-term durability, refine pore structure and lower heat of hydration. Parallel advances in alkali-activated binders and geopolymers exploit the latent reactivity of aluminosilicate precursors to create cement-free matrices with mechanical properties comparable to conventional concrete. Practical implementation spans structural and non-structural elements, from high-performance pavements to marine infrastructures, with attention to local availability, standardisation and life-cycle impact. The global significance of these developments lies in the potential to decarbonise construction at scale, promote circular economy principles and foster resilient infrastructure in diverse climates.

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Sustainable Cementitious Materials in Concrete Applications publication trend

The graph below shows the total number of articles in sustainable cementitious materials in concrete applications across all publications each year (not limited to Nature Index journals).

Technical terms

Supplementary cementitious material (SCM): An inorganic material, often a by-product of industrial processes, that exhibits cementitious or pozzolanic behaviour and is used to replace a portion of Portland cement in concrete.

Pozzolanic activity: The chemical reaction whereby siliceous or aluminous materials react with calcium hydroxide in the presence of water to form additional calcium silicate hydrate phases, enhancing strength and durability.

Geopolymer: A class of inorganic polymers formed by the alkali-activation of aluminosilicate precursors, yielding three-dimensional networks of Si–O–Al bonds that serve as binders in cement-free concretes.

Alkali activation: The process of dissolving aluminosilicate raw materials in a high-pH solution (commonly sodium hydroxide or sodium silicate), initiating polymerisation reactions that produce hardened binder phases.

References

1. Fly Ash-Based Eco-Efficient Concretes: A Comprehensive Review of the Short-Term Properties. Materials (2021).
2. Evaluation of Industrial By-Products as Sustainable Pozzolanic Materials in Recycled Aggregate Concrete. Sustainability (2017).
3. Optimizing the concrete strength of lightweight concrete containing nano palm oil fuel ash and palm oil clinker using response surface method. Case Studies in Construction Materials (2022).