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KSCE Journal of Civil Engineering

, Volume 23, Issue 2, pp 729–736 | Cite as

Carbonation Behavior of Repeated Recycled Fine Aggregate Concrete under Bending Load

  • Pinghua Zhu
  • Kai Chen
  • Kun Hu
Structural Engineering
  • 8 Downloads

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.

Keywords

repeated recycled aggregate concrete recycled fine aggregate compressive strength carbonation resistance bending load 

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Copyright information

© Korean Society of Civil Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Environmental and Safety EngineeringChangzhou UniversityChangzhouChina
  2. 2.State Key Laboratory for Geo-Mechanics and Deep Underground EngineeringChina University of Mining & TechnologyXuzhouChina

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