Electrical Methods for Evaluating Mass Transport Properties of Concrete-Electrical Properties of Concrete to Predict Differences Diffusion Coefficients and Service Life (Recorded Presentation)

Electrical Properties of Concrete to Predict Differences Diffusion Coefficients and Service Life (Recorded Presentation)

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Video Transcription

Video Summary

The presentation discusses the measurement and implications of the electrical resistivity of concrete, emphasizing its role as a quality control tool. The presenter highlights various methods used to determine the chloride diffusion coefficient necessary for predicting chloride ingress into concrete. Challenges include the sensitivity of resistivity to factors like moisture content, pore solution composition, and the presence of supplementary cementing materials (SCMs). While resistivity offers insight into pore structure quality, it does not account for chloride binding, an important factor in chloride resistance. The talk raises concerns about using resistivity as a sole predictor of diffusion coefficients, particularly when translating results across different cementing systems. It also explores the impact of different pore solutions and binding capacities of materials like silica fume and metakaolin on chloride resistance. The presenter concludes that while the formation factor is beneficial, accurately estimating pore solution resistivity requires careful consideration, and current models may inadequately predict resistivity for SCM-containing concretes.

Keywords

electrical resistivity

chloride diffusion

quality control

supplementary cementing materials

pore structure

chloride resistance