An electrical conductivity method for measuring the effects of additives on effective diffusivities in portland cement pastes

✍ Scribed by Aye Aye Kyi; Bill Batchelor

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 695 KB
• Volume: 24
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(94)90201-1

✦ Synopsis

Effective diffusivities are important in describing corrosion and leaching of contaminants in cementitious systems. An electrical conductivity procedure has been used to measure the effective diffusivities of compounds in cementitious systems containing the additives fly ash, silica fume, sodium silicate and bentonite. Silica fume was the most effective additive in reducing the effective diffusivity, but fly ash was the most cost effective. Diffusivities that have been measured with techniques that rely on flux of a compound through the solid were generally lower than those measured with the electrical conductivity procedure. Porosity and bulk density are not well correlated with effective diffusivity in systems containing additives.