1-6 Galvanized Reinforcement for Concrete: Research Update
ILZRO, the International Lead Zinc Research Organization, Inc has been active in galvanized reinforcing steel research for over 40 years addressing technical issues of rebar end users and the galvanizing industry. This paper summarizes the results of five recent galvanized rebar research projects conducted by ILZRO. Key results of each project are as follows: Ongoing 8-year accelerated laboratory corrosion testing at Florida Atlantic University has shown that galvanized rebar, and particularly Galfan coated rebar, show less electrochemical activity and therefore less corrosion than uncoated black rebar in identical concrete test samples. Work at the University of Waterloo focusing on the initial reaction between chromated, non-chromated, weathered and annealed galvanized surfaces and concrete has shown that initial corrosion in OPC, regardless of the zinc coating surface condition, is less than 1 μm before coating passivation occurs. Preliminary results from Kansas University found that zincs chloride threshold for corrosion initiation is varied but on average greater than that of uncoated rebar. Field investigations by the Galvanizers Association of Australia have shown that structures built with galvanized rebar over 25 years ago, some in aggressive marine environments, are still in excellent condition. Another study from Australia confirmed that the galvanizing and fabrication guidelines for 410MPa rebar developed 20 years ago are also applicable for higher strength 500N (MPa) rebar currently in use in Australia. The authors wish to acknowledge and thank the project contractors who contributed progress reports on their work which were used to create this paper.
Rob White Frank E. Goodwi Doug Rourke
International Zinc Association Brussels, Belgium
国际会议
第七届亚太镀锌大会(The 7th Asia Pacific General Galvanizing Conference)(7th APGGC)
北京
英文
34-39
2007-09-14（万方平台首次上网日期，不代表论文的发表时间）