Abstract
Concrete waste was processed into recycled coarse aggregate (RCA), subsequently used to prepare high-strength (> 50 MPa) recycled concrete. The resulting material was tested for mechanical performance (ULS). The recycled concrete was prepared to the required design strength by adjusting the water/cement ratio. Concrete containing 0, 20, 50, 80 and 100% recycled aggregate was prepared and studied for workability, deformability and durability. The ultimate aim of the study was to prepare high-strength recycled concrete apt for use in cold climates as a theoretical and experimental basis for the deployment of recycled high-strength concrete in civil engineering and building construction.
Highlights
Sustained high rates of economic development in recent years, together with rapidly expanding cities and urban renewal, has spurred construction industry growth
The present study focused on the preparation and properties of high-strength recycled concrete for cold climates with a view to establishing an experimental basis for applying recycled concrete in civil engineering [11]
To ensure the quality of high-strength recycled concrete, only recycled coarse aggregate (RCA) whose abrasion test results are comparable to the findings for natural aggregate should be used
Summary
Sustained high rates of economic development in recent years, together with rapidly expanding cities and urban renewal, has spurred construction industry growth. In turn, has generated vast amounts of construction and demolition waste (C&DW). Recycled concrete was first researched and used in developed countries, where codes and standards on its regulation have been published [5,6]. Processing this material first entails crushing and grading. The aggregate so processed is used in concrete mixes, either wholly partially replacing natural (usually coarse) aggregate. While China began to study concrete waste recycling fairly late in the day, the country has recently engaged in more intense research on the subject, as attested to by the literature [9,10]. The present study focused on the preparation and properties of high-strength recycled concrete for cold climates with a view to establishing an experimental basis for applying recycled concrete in civil engineering [11]
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