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Corporate Contributors:Port Authority of New York and New Jersey ; Rutgers University. Center for Advanced Infrastructure and Transportation ; New Jersey Institute of Technology ; United States. Department of Transportation. University Transportation Centers (UTC) Program ; United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology ; ... More +
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Edition:Final Report 05/01/2021 – 03/31/2023
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Abstract:The optimization of the aggregate gradation and packing degree in concrete can contribute reduction in the amount of cement without loss of mechanical properties, which leads to development of concrete with significantly less carbon footprint from cement consumption. This study presents several criteria to optimize the binary and ternary blends of aggregates of different sources and gradations. The optimization is based on aggregate particle size distribution (PSD), aggregates packing degree (PD), and aggregate workability factor and coarseness factors. The experimental and multiple theoretical methods have been employed to identify the aggregate blends of the highest PD. These aggregate blends are further optimized by utilizing the gradation techniques with power curves (PC) and coarseness charts (also known as Shilstone charts). The study demonstrated agreement between the theoretical PD obtained from the Modified Toufar model and the experimental PD obtained from aggregate blends. Finally, the Shilstone chart presented the workability and coarseness factors of different aggregate blends considering various cement contents. Additional work on the determination of strength and global warming potential (GWP) of the concrete mix with the optimized aggregate blends must be performed to achieve a conclusive understanding of the correlation between the aggregate optimization with the reduction in cement consumption and sustainability of concrete. The aggregate optimization strategies in this study are being implemented into a broader scheme to reduce carbon footprint of concrete using supplementary cementitious materials among other approaches.
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