NOVEL METHODS FOR IN SITU TESTING AND MONITORING OF THE DURABILITY OF REINFORCED CONCRETE STRUCTURES
Corrosion of steel in reinforced concrete due to carbonation and chloride ingress isone of the principal causes of deterioration of reinforced concrete structures. It is widelyrecognised that the concrete cover provides protection to the reinforcement against bothcarbonation and chloride ingress,which in turn depends on its permeation characteristics.Therefore,a measure of the transport properties of the concrete cover is important forassessing the durability of reinforced concrete. On the other hand,measurement of the rate ofcarbonation and the advance of the chloride front is essential to predict the service life ofreinforced concrete structures. That is,methods which can be used to monitor the effect ofcarbonation and chloride ingress would be required. In this paper,two in situ permeabilityapparatus,viz. Autoclam Permeability System (for measuring gas/water permeability andwater absorption) and Permit Ion Migration Test (for determining the ionic diffusion) aredescribed. These instruments can be mounted on the concrete surface for carrying out thetests. Some typical results are presented for these two novel testing systems to illustrate theirusefulness for the condition assessment of reinforced concrete structures. In addition,thedevelopment of fibre optic sensor systems for monitoring the pH of concrete is described.
carbonation chloride ingress pH sensors air permeability sorptivity ion diffusion
Muhammed P.A.Basheer Sreejith V. Nanukuttan Daniel McPolin Adrian E. Long Kenneth T.V. Grattan Tong Sun
School of Planning,Architecture and Civil Engineering,Queens University of Belfast,Northern Ireland School of Engineering and Mathematical Sciences,City University London,UK
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
79-91
2008-11-01（万方平台首次上网日期，不代表论文的发表时间）