Sub-distributions of pore size: A new approach to correlate pore structure with permeability

✍ Scribed by Zheng Liu; Douglas Winslow

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 745 KB
• Volume: 25
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(95)00067-m

✦ Synopsis

A typical cement paste pore-size distribution from mercury intrusion porosimetry has a hysteresis loop during an intrusion -extrusion -reintrusion cycle. The hysteresis can be eliminated merely by selecting an appropriately smaller receding contact angle. This allows one to subdivide the total pore-size distribution into two sub-distributions: one reversible and one irreversible. These sub-distributions were found for a series of cement pastes having w/c between 0.32 and 0.60 and ages between 1 and 30 days. In addition, the chloride permeabilities of the pastes were determined. This permeability was found to correlate more closely with the reversible sub-distribution than with either the total or the irreversible distributions. Specifically, it was found that the threshold diameter and intrusion volume of the reversible sub-distribution were the parameters that were best related to the permeability. This is presumably because the threshold pore diameter of the reversible sub-distribution represents the largest continuous path through the most accessible part of the pore system.