Sustainable alternatives to cement in structural engineering
by Guosong Yang
Building Engineering, Vol.3, No.4, 2025;
The environmental impact of ordinary Portland cement (OPC) production, particularly its high carbon emissions and energy consumption, has prompted the structural engineering community to seek more sustainable alternatives. This review examines a range of materials that can partially or fully replace OPC, including industrial by-products (e.g., fly ash, ground granulated blast furnace slag), geopolymers, natural pozzolans, and recycled construction waste. The article evaluates these alternatives in terms of their mechanical performance, durability, workability, and suitability for structural applications. Environmental and economic assessments, including life cycle analysis and cost considerations, are also discussed to provide a holistic view of sustainability. While many alternatives show promising performance and environmental benefits, wider adoption depends on overcoming technical challenges, regulatory gaps, and market inertia. This review highlights the need for integrated efforts in research, policy, and practice to transition toward more sustainable materials in structural engineering.
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