Journal article
Laboratory investigation of reinforcement corrosion initiation and chloride threshold content for self-compacting concrete
Cement and concrete research, Vol.40(10), pp.1507-1516
2010
Handle:
https://hdl.handle.net/2376/121506
Abstract
Time-to-corrosion (Ti) of reinforcement in concrete and chloride threshold content (Cth) are important service life determinants for reinforced concrete structures in chloride-laden environments. In this study, the two determinants of a series of self-compacting concretes (SCC) and regular concretes were experimentally investigated. A new sampling approach for Cth determination (milling powder from corrosion active site at the rebar/concrete interface) was adopted to accurately express chloride content resulting in corrosion occurrence. It is found that the Ti and Cth follow the 3-parameter Weibull distribution. The results indicate that the corrosion initiation of rebar in concrete slabs depends upon both cement alkalinity and superplasticizer. Rebar, embedded in high alkalinity cement SCC, exhibits better corrosion resistance as indicated by the longer Ti, higher Cth and larger Weibull modulus, m. A larger Weibull modulus indicates that anti-corrosion performance of rebar in slabs is more stable and less scattered. The effects of specific superplasticizer on rebar corrosion resistance are discussed from the viewpoint of air void amount and size distribution at the rebar/concrete interface.
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Details
- Title
- Laboratory investigation of reinforcement corrosion initiation and chloride threshold content for self-compacting concrete
- Creators
- Hui Yu - Materials Engineering Department, Southwest Research Institute ®, 6220 Culebra Road, San Antonio, TX 78238, USAXianming Shi - Corrosion and Sustainable Infrastructure Laboratory, Western Transportation Institute, Box 174250, College of Engineering, Montana State University, Bozeman, MT 59717-4250, USAWilliam H Hartt - Center for Marine Materials, Florida Atlantic University–Sea Tech Campus, 101 North Beach Road, Dania Beach, Florida 33004, USABaotong Lu - Materials Engineering Department, Southwest Research Institute ®, 6220 Culebra Road, San Antonio, TX 78238, USA
- Publication Details
- Cement and concrete research, Vol.40(10), pp.1507-1516
- Academic Unit
- Civil and Environmental Engineering, Department of
- Publisher
- Elsevier Ltd
- Identifiers
- 99900612857101842
- Language
- English
- Resource Type
- Journal article