PERFORMANCE OF CONCRETE UNDER MARINE EXPOSURE
Full-size bridge pier-stems were fabricated and placed at predefined locations at amarine site to provide XS1; XS2 and XS3 environments as defined in BS 8500 and BSEN206-1. The concrete pier-stems were 2.0 m high and octagonal in plan with each verticalface 0.66 m wide. They were constructed in groups of three (one each at the locations definedabove): one group,which was used as a benchmark,represented ordinary Portland cementconcrete; the second group was treated with an integral pore-blocker and hydrophobic pore-liner added at the time of mixing and the third was treated with a hydrophobic pore-liner. Anextensive chloride-profiling programme was undertaken to obtain the spatial distribution ofchloride concentration within the cover zone concrete at a number of locations on each pierstem. Curve-fitting to the chloride profiles obtained surface chloride concentrations andeffective diffusion coefficients which were,subsequently,used to evaluate the performance ofthe concrete to chloride ingress for different exposure conditions. Data presented represent theinitial seven years exposure and,even within this time-scale,chloride ingress was significantfor some of the pier-stems; furthermore,all pier-stems displayed considerable variation ofresults for both surface concentration and effective diffusion coefficient.
concrete marine environment chloride diffusion coefficient surface concentration
W. John McCarter Brian T. Linfoot Muhammed Basheer Srejith V. Nanukuttan Thomas M. Chrisp Lulu Basheer
Heriot Watt University,School of the Built Environment,Edinburgh,Scotland,UK Queens University,School of Planning,Architecture and Civil Engineering,Belfast,N.Ireland,U.K.
国际会议
The International Conference on Durability of Concrete Structures(2008年混凝土结构耐久性国际学术会议)
杭州
英文
878-884
2008-11-01（万方平台首次上网日期，不代表论文的发表时间）