Fines characterization through the methylene blue and sand equivalent test: comparison with other experimental techniques and application of criteria to the aggregate quality assessment |
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Authors: | Ana Petkov?ek Matej Ma?ek Primo? Pav?i? Feri Bohar |
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Affiliation: | (1) Chair of Soil Mechanics, Faculty of Civil and Geodetic Engineering, University of Ljubljana, Ljubljana, Slovenia;(2) Chair of Soil Mechanics, Faculty of Civil and Geodetic Engineering, University of Ljubljana, Jamova 2, 1000 Ljubljana, Slovenia;(3) Slovenian National Building and Civil Engineering Institute, Ljubljana, Slovenia;(4) Building Materials Institute IGMAT, Ljubljana, Slovenia; |
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Abstract: | In road construction the general term fines is used to describe particles passing the 0.063, 0.074 or 0.08 mm sieve. Some
types of fines are considered to be relatively inert and have almost no effect on pavement performance, whilst the presence
of even small amounts of others can significantly affect the stiffness and freezing–thawing behaviour of unbound and hydraulically
bound layers. This paper presents the results of research on 12 Slovenian aggregates produced from limestone and dolomite
bedrock, and naturally occurring river alluvium gravel. At each production site three different materials were sampled and
tested: the actual aggregate for unbound base layers, the clayey soils, which presented the most potentially harmful component
at the specific location, and the stony dust, which presented the finest size of crushed aggregate and is typically found
as coatings on the crushed grains. Six different methods were used to identify the nature of the fines: X-ray diffractometry,
carbonate content determination, methylene blue, sand equivalent, Enslin–Neff water absorption, Atterberg limits test, soil
suction measurements and soil water characteristic curves. Based on the results, the relationship between the properties of
the different fines was determined and included in draft Slovenian national criteria for sand equivalent and methylene blue
values currently being trialed. |
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