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سازه های بتنی

 

Laboratory investigation of reinforcement corrosion initiation and chloride threshold

content for self-compacting concrete
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 largerWeibull modulus, m. A largerWeibull 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.
 
 

http://www.abaco.ir/images/download/Laboratory%20investigation%20of%20reinforcement%20corrosion%20initiation%20and%20chloride%20threshold%20content%20for%20self-compacting%20concrete.pdf

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