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Durability Evaluation of Concrete with High-volume Recyled Materials

Zare Banadkoki, Mohammad
This work aims to analyze the durability of concrete with high replacement percentages of virgin materials with recycled concrete as a coarse aggregate and class-C fly ash as a supplementary cementitious material. More specifically, frost resistance of the mixtures were investigated by performing cyclic freezing and thawing testing (ASTM C666) and salt scaling resistance following a method based on the BNQ NQ 2621-900 method. In addition, the electrical resistivity and rate of absorption of the mixtures were determined, along with their tensile and compressive strengths, to aid in the comparative analysis. A total of 19 mixtures containing different combinations of recycled concrete aggregate (0%, 25%, 50%, 75% and 100%) and Class-C fly ash (0%, 20%, 40%, 50%, 60%) were investigated. Results demonstrate promising use of the evaluated materials for concrete mixtures.