Abstract
Carbonation resistance is an important factor affecting the durability of concrete, and the carbonation behavior of structural concrete become more complex under loading. In order to investigate the feasibility of utilizing Recycled Fine Aggregate (RFA) in structural concrete under a coupling of bending load and carbonation, two generations of repeatedly Recycled Aggregate Concrete (RAC1 and RAC2) with four different replacements level (10%, 20%, 30%, and 40%) of Natural Fine Aggregate (NFA) by RFAs were prepared, and carbonation depths of all concrete mixes were tested under an action of bending load of 40, 70, 100, and 120% of failure load. The results indicated that the repeated RAC successfully reached the target slump and target compressive strength, despite both workability and compressive strength decreased with increasing RFA replacement ratio. The carbonation depth of repeated RAC increased with the increasing replacement ratio of RFA. With bending load increasing, the carbonation depth of repeated RAC also increased except for the specimens suffered 70% of failure load. The resultant insights demonstrate the feasibility of using repeated RAC to design a service lifetime of 50 years in practical engineering.
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Zhu, P., Chen, K. & Hu, K. Carbonation Behavior of Repeated Recycled Fine Aggregate Concrete under Bending Load. KSCE J Civ Eng 23, 729–736 (2019). https://doi.org/10.1007/s12205-018-0348-4
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DOI: https://doi.org/10.1007/s12205-018-0348-4