The HERMES transport research portal is a central point for accessing transport research databases worldwide. This portal is a tool for researchers at all levels and aims to facilitate innovation and collaboration in transport research.
In this method a constant head of 1 m of water is maintained on the soil. By continuously measuring the water to be added over a duration of at least 20 min, it is possible to determine the permeability of the subgrade soil.
A significant correlation between test results from a percussion sounding apparatus and the California Bearing Ratio (CBR value) has been established for fine soils ranging from silt to fine sandy soils I (D < 0,2 mm).
In a standardized form this equipment and test method can render invaluable services:
It has been quite a few years since nuclear measurement methods made their appearance in road construction to check the density of various materials in pavement structures. Yet there has been no proper breakthrough of such measurements in Belgium to date, whereas our neighbours have used the method sucessfully for several years.