The Pinhole Dispersion Test (AS1218.104.22.168) can be a useful tool for identifying dispersive clay soils and other soils that are prone to erosion and instability.
It can help to identify potential problems in construction and engineering projects and to guide appropriate measures to mitigate those problems.
How does the Pinhole Dispersion Test work?
The test is performed by replicating the conditions of water flowing along a crack in a soil mass. Water is directed through a 1.0mm pinhole drilled into a compacted soil sample. The dispersibility of the sample is determined by calculating the flow rate of water through the pinhole, evaluating the cloudiness of the water, and measuring the final size of the pinhole.
What is the difference between a permeability test and pinhole dispersion device?
A ‘Pinhole’ is from identifying dispersive clay soils and other soils that are prone to erosion and instability. Where a permeability is to measure the flow of a liquid through a soil sample.
Is the Pinhole Dispersive Test an indicator of dispersive soil behaviour?
Yes, it will indicate whether the soil is highly dispersive, dispersive, potentially dispersive, non-dispersive or erosion resistant.
What are the benefits of Pinhole Dispersion testing?
It identifies the dispersive characteristics of soil and helps determine the stability of clay soils used or about to be used in construction.
Does your next project require Pinhole Dispersive Testing?
Find out more information about how we can assist with Pinhole Dispersive Testing when you get in contact with us at Coffey Testing – Adeliade here.