Classification and index testing

As all soil is composed of a variety of components, which can result in very soil-specific characteristics, a proper, clear and systematic description of these components and the resulting classification of the characteristics is essential. For such a classification a set of relatively simple tests, so-called index-tests, can be used which will provide the (geo-technical) lab technician and/or advisor with  proper foundations for its classification. For example, tests to determine the volumetric density, particle density, particle size distribution, plasticity and undrained shear strength are among the index-tests. Yet, also some simple soil-chemical tests, i.e. organic matter and carbonate content, are used for the classification of soil.

Acceptance incoming soil samples

Upon arrival at the geotechnical laboratory, an official handover takes place for both the samples and the accompanying ‘soil sample registration forms’. After a visual check (i.e. for any damages, correct labelling and correct sealing of the samples), the samples are weight and the content is measured (lengths of each soil sample). After registration the samples are stored vertically under specific conditions (temperature of 12°C, and a relative humidity between 85 and 100%, conform 5.3.2.), until they are ready for further testing. This protects the samples against any changes in mechanical behaviour of the soil. In case of any doubt the decision can be made (in consultation with the client) to reject the sample and request a second attempt to be made at the sample location. Of course, it is possible to use the rejected sample for further analyses; however the results of these analyses will then automatically be deemed indicative.

Opening undisturbed samples