Pinhole Dispersion Apparatus is used in conducting the Pinhole Test, which identifies the dispersive characteristics of soil and helps determine the stability of clay soils used – or about to be used – in construction. Numerous instances of structure failure have been attributed to piping (internal erosion from water seepage), so assessing dispersiveness of soils is integral to increased safety and the ultimate longevity of a structure.
The test is performed by replicating the conditions of water flowing along a crack in a soil mass. Water is directed through a .040in (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. The results can be used in evaluating the cost-effectiveness of projects and identifying potential safety issues.
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