Laboratory Tests On The Cleanliness Of
Soil Materials Used As Subgrades In
Pavement Structures
Author(s)
A. Athanasopoulou & G. Kollaros
Abstract
In order to ascertain the presence of very fine material passing the No. 200 sieve,
cleanliness tests are performed in the laboratory. The most important of these
tests refer to the determination of the quantity of fines, of the sand equivalent
value, of the plasticity index, as well as the methylene blue value of the material
tested. Performing the sand equivalent test the percentage of very fine dust in
claylike form can be established. Materials with very low sand equivalent are
characterized as \“impure” and the possibility of the existence of clay size grains
in them is very high. In such cases it is necessary to perform a test in order to
determine the plasticity of the soil material. The determination of the plasticity
index of natural soils specifies their suitability as subgrade layers in pavement
structures. Soils having a sand equivalent value lower than 10% will develop
excessive swell with a simultaneous decrease in their bearing capacity when a
pavement is built on them. The quantity of methylene blue absorbed by clay
components of a soil mass is proportional to the specific area of the clay
minerals. The methylene blue test supplements the sand equivalent and Atterberg
limits tests, since with these the existence of clay-size grains is determined, but
not the existence of active clay minerals as well. A number of soil samples have
been examined in the laboratory, involving the procedures of cleanliness tests.
The quantity of fine grained material was determined and their activity was
accessed. The magnitudes were correlated in order to check the suitability of
soils as a pavement foundation. Empirical relationships have been established
which connect the attributes characterizing the cleanliness of soil materials.
These relationships compare very well with most of the findings published
worldwide.
Keywords: swelling soils, methylene blue test, sand equivalent, cleanliness.
Keywords
swelling soils, methylene blue test, sand equivalent, cleanliness
Related Book
Other papers in this volume
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