Experimental measurements of chloride ion diffusion rates using a two-compartment diffusion cell: Effects of material and test variables
✍ Scribed by Kevin A. MacDonald; Derek O. Northwood
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 674 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0008-8846
No coin nor oath required. For personal study only.
✦ Synopsis
Chloride ion diffusion rates in cementitious paste have been determined using a modification to the "standard" two-compartment diffusion cell. Ordinary Portland cement samples of varying water/cement ratios were investigated together with similar materials to which varying amounts of pyrolysed scrap automotive polymer (Sheet Moulding Compound -SMC) had been added. The effects of changes in the experimental conditions (sample thickness, chloride ion concentration in first compartment) were also investigated. The chloride ion diffusivity was reduced by either reducing the water/cement ratio or by the incorporation of pyrolysed SMC into the mix. There was a small decrease in effective chloride ion diffusivity with increase in sample thickness. The concentration of chloride ion in Cell 1 had no significant effect on the measured diffusivity.
However, by increasing the concentration, the time required to make the diffusivity measurements can be significantly reduced.