Product · Materials Science
Product · InnDex 72 · Evidence provided · Moderate specification risk
Structural concrete using construction waste aggregate, matching virgin concrete strength with 25–35% lower embodied carbon.
Recycled aggregate concrete (RAC) substitutes crushed construction waste for virgin stone while maintaining compressive strength through optimized binder chemistry and particle grading. It addresses embodied-carbon and circular-economy imperatives in structural applications where carbon footprint and waste diversion are material project goals. 500+ documented European and North American projects, including the Genome building (Amsterdam, 2019), provide deployment evidence; EPDs confirm carbon reduction versus conventional concrete.
Recycled aggregate concrete substitutes crushed construction and demolition waste for virgin stone while maintaining structural performance parity through engineered binder chemistry and particle grading, delivering 25–35% embodied-carbon reduction versus conventional concrete with third-party EPD verification usable in whole-life carbon accounting and building certifications. With 500+ European and North American projects documented — including the Genome building in Amsterdam in 2019 — this is not a lab concept; deployment evidence is real and the technical case for structural applications is established. The constraints are logistical rather than material: recycled aggregate quality is variable, and source contamination or inconsistent grading requires quality testing and may trigger reformulation, adding procurement lead time and cost uncertainty. Higher water absorption in recycled aggregate increases moisture sensitivity in exposed or wet environments and may require protective design detail. The supply chain for screened, clean recycled aggregate is geographically fragmented — readily available in some markets, scarce or uncompetitive in cost in others — so early confirmation of local availability and pricing is essential before assuming this reduces cost as well as carbon. Design codes in some jurisdictions lag the material science and may require engineering justification; and long-term durability data under diverse exposure conditions, while positive, is thinner than the century-scale track record of virgin aggregate concrete — a specifier should be direct with clients about the distinction between the strong structural performance record and the still-developing long-term exposure dataset.
CEMEX and Aggregate Industries publications and EPDs support strength parity and carbon claims. 500+ projects cited but no verified registry found; Genome building (2019) is real and documented. Strength guarantees appear genuine but contingent on supply-chain control and mix design; testing protocols and long-term durability data (20+ years) are sparse in public domain. Recycled aggregate quality varies by source; tipping-point cost and premium vs. virgin concrete not disclosed in source.
#circular_economy #embodied_carbon #recycled_aggregate #structural_concrete #EPD_verified