A COMPARISON OF THE STEP AND SWEEP TECHNIQUES FOR LINEAR POLARISATION RESISTANCE MEASUREMENTS
A number of non destructive tests are available to assess the probable currentcondition of the structure and the current level of corrosion. The Linear PolarisationResistance (LPR) method has recently become an established technique for measuring theinstantaneous corrosion rate of steel in concrete. The LPR measurement uses a small currentto perturb the equilibrium potential of the reinforcing steel and monitor the response. Thesedata are then used to determine the instantaneous corrosion rate of the steel,which can then beused to estimate the present and the likely future level of deterioration,and,hence,plan theoptimum management strategy for the structure. The LPR technique can either be used byapplying the perturbation as a single step,or a continuous sweep,with both methods used inpractice. This paper reports the findings of a research project to investigate the corrosion ratesmonitored on a set of steel bars with different levels of corrosion,using both techniques. Itreports the corrosion rates measured in individual readings,as well as the average of a set ofreadings. The techniques were applied in different conditions and in a random order todetermine the reliability and sensitivity of the two techniques.
concrete steel reinforcement corrosion linear polarisation
D W Law Thomas Molyneaux Dean Crew
School of the Built Environment,Heriot Watt University,UK School of Civil,Environmental and Chemical Engineering,RMIT University,Australia
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
1122-1129
2008-11-01（万方平台首次上网日期，不代表论文的发表时间）