Product · Materials Science
Product · InnDex 62 · Evidence provided · High specification risk
3D-printable concrete with 60% waste glass powder cement replacement, 44% lower embodied energy, field-proven in Singapore.
A concrete formulation for additive construction that substitutes 60% ordinary Portland cement with recycled waste glass powder, achieving ≥50 MPa compressive strength while reducing embodied energy by 44% and CO₂ by 52%. Improves chloride resistance. Two structural on-site 3DCP deployments in Singapore (2025–2026), verified by building authority and contractor, demonstrated 50% labour savings and practical constructability.
This NUS formulation substitutes 60% of ordinary Portland cement with recycled waste glass powder, achieving a compressive strength of at least 50 MPa — structural grade — alongside a 44% reduction in embodied energy and a 52% reduction in CO₂ versus conventional printable concrete. Two field deployments in Singapore in 2025–2026, verified by the building authority and contractor, confirm that the material prints, cures, and achieves design strength in a real project environment, not just a laboratory. For teams pursuing 3D concrete printing with embodied carbon targets, this is among the more substantiated low-carbon mix options currently published. The constraints are geographic and logistical: only two deployments exist, both in Singapore's tropical climate and with access to local recycling infrastructure that produces the glass powder feedstock; transferability to other climates and supply chains is plausible but undemonstrated. Waste glass powder particle-size consistency at industrial supply scale has not been addressed, and sourcing reliability depends on regional recycling infrastructure that varies significantly by market. The material is process-specific — it cannot substitute into conventional reinforced concrete casting without reformulation, so its value is conditional on the project committing to 3DCP as the construction method, with all the equipment, expertise, and regulatory pathway dependencies that entails.
Source is institutional (NUS news) with cited peer-review publication (Construction and Building Materials, DOI 10.1016/j.conbuildmat.2026.145431). Two on-site deployments with third-party verification (Building and Construction Authority, Singapore) provide genuine deployment signal beyond lab. Compressive strength, embodied-energy, and CO₂ metrics are stated with specific figures. 50% manhour saving is supported by documented field exercise. No evidence of regulatory approval pathway, cost premium, or long-term durability (>10 year) monitoring yet reported. Publication DOI has future date (2026) — likely accepted-in-press; verified live publication status not independently confirmed here.
#3D concrete printing #waste glass #cement substitution #low-carbon concrete #additive construction