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- W4387161504 abstract "As the global urban population continues to grow, reducing the carbon footprint of our built environment is on the critical path towards achieving net-zero CO2 targets by 2050. Representing the largest contributor to infrastructure-related emissions, the cement and concrete sectors are accelerating their efforts to develop low carbon concrete structures. In line with this critical path, this paper presents a first of its kind study on the performance of reinforced concrete beams produced using concrete containing very high quantities (greater than 80%) of recycled and secondary materials. A total of 24 low carbon concrete mixtures were developed and evaluated. Mixtures included the use of coarse and fine recycled concrete aggregates (100% replacement of natural aggregates) and the use of ground granulated blast furnace slag (50% replacement of portland cement). Using a combination of novel mixture proportioning and two-stage mixing methods, mixtures were adjusted to improve compressive strength, workability, and batch-to-batch consistency. Several low carbon concrete mixtures containing greater than 70% recycled and/or secondary materials achieved compressive strengths of approximately 30 MPa. Twelve reinforced concrete beams (2.25 m) were tested in four-point bending. Reinforced concrete beams produced with low carbon concrete with up to 89% recycled and/or secondary materials had ultimate moment capacities which were, on average, only 5% lower compared to the conventional concrete beams. Current CSA A23.3 design equations were conservative in their estimates of ultimate moment capacity for both the conventional and low carbon concrete beams." @default.
- W4387161504 created "2023-09-30" @default.
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- W4387161504 date "2023-12-01" @default.
- W4387161504 modified "2023-09-30" @default.
- W4387161504 title "Material behaviour and flexural performance of low carbon concrete beams containing very high quantities of recycled and secondary materials" @default.
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- W4387161504 doi "https://doi.org/10.1016/j.conbuildmat.2023.133350" @default.
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