Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 138, Issue -, Pages 254-262Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2017.02.022
Keywords
Recycled aggregate concrete; Durability; Sulfate attack; Wetting-drying cycles
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Funding
- National Natural Science Foundation of China [51578141]
- National Program on Key Basic Research Project (973 Program) [2015CB655102]
- Natural National Science Foundation
- National Program on Key Basic Research Project
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The evaluation of the damage process of recycled aggregate concrete made with different recycled coarse aggregate (RCA) replacements (30%, 50%, 70% and 100%) exposed to sodium sulfate solution (50 g/l) under wetting-drying cycles is investigated in this paper. Fly ash and granulated blast-furnace slag modified recycled aggregate concrete were examined by comparison with plain recycled aggregate concrete. Mass change, relative dynamic modulus of elasticity and water-soluble SO42- contents of the specimens were measured. XRD, ESEM and XCT were used to investigate the changing of corrosion products and microstructure of interior concrete. The results indicate that the incorporation of RCA shows an obvious impact on the resistance of concrete against sulfate attack under wetting-drying cycles. Additionally, the FA and GBH modified recycled aggregate concretes exhibit better resistance than plain recycled aggregate concrete. The analysis of corrosion products from XRD and microstructure from XCT and ESEM is in accordance with the results of water-soluble SO42- contents, mass change and Era. (C) 2017 Elsevier Ltd. All rights reserved.
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