Development of a sustainable binder made of recycled high-performance concrete (HPC)

The high consumption of ordinary Portland cement (OPC) in high-performance concrete (HPC), combined with the growing accumulation of construction and demolition wastes (CDW), raises severe environmental and economic concerns. This study addresses both issues by proposing a novel sustainable binder m...

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Veröffentlicht in:Case Studies in Construction Materials 2022-12, Vol.17, p.e01571, Article e01571
Hauptverfasser: Daneshvar, Dana, Liberto, Teresa, Dalconi, Maria Chiara, Stöllinger, Waltraud, Kirnbauer, Johannes, Robisson, Agathe
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Sprache:eng
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Zusammenfassung:The high consumption of ordinary Portland cement (OPC) in high-performance concrete (HPC), combined with the growing accumulation of construction and demolition wastes (CDW), raises severe environmental and economic concerns. This study addresses both issues by proposing a novel sustainable binder made of milled recycled HPC (mRHPC). A series of HPC mix designs (R-HPC) was developed replacing OPC by mRHPC (0–100%), and characterized in fresh and hardened states. The residual reactivity of mRHPC was detected using X-ray diffraction, calorimetry, and rheological oscillatory measurements (SAOS). Replacement up to 30% resulted in comparable 28-day compressive and flexural strengths to that of the OPC reference specimen while slightly improving fresh properties. Furthermore, the performance of steel fiber reinforced R-HPC overlays was investigated in repair application, and 30% replacement ratio enhanced the tensile bond strength by a factor of 2.4. The measured improved flow properties and reduced drying shrinkage can explain this remarkable result.
ISSN:2214-5095
2214-5095
DOI:10.1016/j.cscm.2022.e01571