Journal
INTERNATIONAL JOURNAL OF CONCRETE STRUCTURES AND MATERIALS
Volume 15, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1186/s40069-021-00473-w
Keywords
recycled coarse aggregates; fly ash; chloride penetration; marine site; steel corrosion; compressive strength
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Funding
- Research Grant of Burapha University through National Research Council of Thailand
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Through a 7-year field investigation, it was found that adding 15-25% fly ash significantly improves the durability performance of RCA concrete in marine environments, providing higher resistance to destruction compared to NA concrete with the same water-to-binder ratio.
This research aimed to create value of construction and demolition waste to be able used as a recycled coarse aggregate (RCA) in durable concrete, based on 7-year field investigation in marine site. Fly ash was used to substitute Portland cement type I in RCA concrete varied from 0 to 50% by weight of binder with three W/B ratios and comparing to natural aggregate (NA) concrete. Cubical concrete specimens were cast having round steel bars embedded with various concrete coverings to evaluate the durability performances. After 28-day curing, the specimens were placed at a tidal zone in the gulf of Thailand and investigated both mechanical and durability performances at 7-year exposed period. Based on site monitoring, 15-25% fly ash RCA concrete with W/B ratio of 0.40 would be advantaged to resist destruction due to the marine attack when compared with NA concrete with the same water-to-binder ratio.
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