Daneshvar, D., Liberto, T., DALCONI, M. C., Stöllinger, W., Kirnbauer, J., & Robisson, A. (2022). Development of a sustainable binder made of recycled high-performance concrete (HPC). CASE STUDIES IN CONSTRUCTION MATERIALS, 17, Article e01571. https://doi.org/10.1016/j.cscm.2022.e01571
E207 - Institut für Werkstofftechnologie, Bauphysik und Bauökologie
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Journal:
CASE STUDIES IN CONSTRUCTION MATERIALS
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ISSN:
2214-5095
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Date (published):
Dec-2022
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Number of Pages:
16
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Publisher:
ELSEVIER
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Peer reviewed:
Yes
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Keywords:
High-performance concrete (HPC); Recycling; Construction and demolition waste (CDW); Sustainability; Supplementary cementitious materials; SAOS
en
Abstract:
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.