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doi:10.3850/978-981-08-7920-4_S3-M023-cd
Corrosion Performance of Concrete Containing Rice Husk-bark Ash Under 5-year Exposure in Marine Site
W. Chalee1, P. Suwanmaneechot2 and C. Jaturapitakkul3
1Department of Civil Engineering, Faculty of Engineering, Burapha University, Thailand.
2Department of Civil Engineering, School of Engineering, Naresuan University Phayao, Thailand.
3Department of Civil Engineering, Faculty of Engineering, King Mongkut’s University of
Technology Thonburi, Bangkok, Thailand.
ABSTRACT
In this study, chloride penetrations and steel corrosion of concrete containing ground rice huskbark
ash (GRBA) under 5-year exposure in marine site were investigated. Control concretes
were designed using Portland cement type I and V with W/B ratios of 0.45 and 0.65. The
GRBA was used as a pozzolanic material to replace Portland cement type I at 0, 15, 25, 35, and
50% by weight of binder with the same W/B ratio of control concrete. The 200mm concrete
cube specimens with steel bar embedded at coverings of 20, 50 and 75mm were cast. The
specimens were cured in water for 28 days and then were exposed to tidal zone of marine
environment in the gulf of Thailand. The specimens were tested for compressive strength,
chloride penetration and corrosion of embedded steel after being exposed to tidal zone for 5
years. The GRBA concretes continuously gain strength faster than cement concretes, especially
in concrete containing GRBA of 15%–35% by weight of binder. The concrete containing GRBA
of 15% to 25% (by weight) reduces the chloride diffusion coefficient in concrete together with a
low steel corrosion.
Keywords: Concrete, Rice husk-bark ash, Marine environment, Chloride penetration, Steel corrosion.
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