Valorization of Industrial Waste Materials in Construction Applications
Summary
The valorization of industrial waste in construction seeks to transform by-products and residues from sectors such as pulp and paper, steelmaking and energy generation into functional components for building materials. This approach aligns with circular-economy principles by reducing reliance on virgin resources, lowering greenhouse-gas emissions and diverting waste from landfill. Key strategies include the use of inorganic sludges and ashes as supplementary cementitious materials, the incorporation of slags and grits as fine or coarse aggregates, and the synthesis of alkali-activated binders and geopolymers from aluminosilicate-rich residues. Practical applications range from blended cements and mortars to precast panels and structural concretes. Challenges remain in standardising waste characterisation, ensuring long-term durability and integrating novel materials into existing standards. Nevertheless, advances in pre-treatment methods, mix-design optimisation and life-cycle assessment are rapidly expanding the technical viability and environmental credentials of waste-derived construction products on a global scale.
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Technical terms
Geopolymer: A three-dimensional aluminosilicate network formed by alkali activation of industrial by-products, used as an alternative binder to Portland cement.
Pozzolanic material: A siliceous or aluminous substance that, when finely divided and in the presence of water, reacts with calcium hydroxide to form cementitious compounds.
Alkali-activated binder: A construction material produced by reacting an alkaline activator with aluminosilicate precursors to yield hardened binders with minimal or no Portland cement.
Green liquor dregs (GLD): The inorganic residue from the pulping process rich in calcium and other minerals, often repurposed as a supplementary cementitious material.
Circular economy: An economic model focused on resource efficiency, waste minimisation and closed-loop reuse of materials to reduce environmental impact.
References
- Effects of thermal treatment on the characteristics of pulp mill residue. Journal of Environmental Management (2023).
- Innovative Recycling of Lime Slaker Grits from Paper-Pulp Industry Reused as Aggregate in Ambient Cured Biomass Fly Ash-Based Geopolymers for Sustainable Construction Material. Sustainability (2019).
- Sustainability Evaluation Using a Life Cycle and Circular Economy Approach in Precast Concrete with Waste Incorporation. Applied Sciences (2021).
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