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Title	Freeze-thaw resistance of concrete containing mixed aggregate and construction and demolition waste-additioned cement in water and de-icing salts
ID_Doc	19979
Authors	del Bosque, IFS; Van den Heede, P; De Belie, N; de Rojas, MIS; Medina, C
Title	Freeze-thaw resistance of concrete containing mixed aggregate and construction and demolition waste-additioned cement in water and de-icing salts
Year	2020
Published
Abstract	Durability is a key property in concrete structures exposed to freeze-thaw cycles, particularly where the concrete mix includes recycled materials. This study explores 25% or 50% replacement of natural with mixed recycled aggregate (MRA) from construction and demolition waste (CDW), in concrete mixes prepared with recycled cement (including 25% fired clay-based waste and called OPC-CDW) or with ordinary Portland cement (OPC) and its effect on structural concrete resistance to freeze-thaw cycles (exposure classes XF1 to XF4). The findings show that the inclusion of MRA and OPC-CDW affect the material differently depending on the type of exposure. In concrete exposed to water, MRA induce a decline in load capacity, whereas OPC-CDW raised strength. The opposite was observed in concrete in contact with deicing salts. The recycled concrete designed, proved to resist freeze-thaw cycles conducted in water (XF1 and XF3), whilst the presence of de-icing salts (XF2 and XF4) compromised their durability. In such cases additional measures would be needed for in the design and construction of structures built with recycled concrete. (C) 2020 Elsevier Ltd. All rights reserved.
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