Laboratoriepackning och materialseparationsförsök på ett krossat filtermaterial
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
In construction with crushed rock materials today’s standards are based on natural materials, although differences exist between the materials. The particle of natural gravel is smooth and rounded, unlike the squared and rough surface of crushed material – thus providing differing features. When gravel is compacted the round particles easily slide against each other, creating a compact material. The rough particles of the crushed material grip into one another, and the material receives less compaction than natural gravel although the same compaction energy is used. In this master thesis, laboratory work has been performed on a crushed fine filter material for a hydropower dam. The aim is to study the effects of compaction work with respect to porosity and methods for studying the material separation. Material segregation leads to inhomogeneous material - which may cause stability problem in the construction. There is currently no standardized method to examine the tendency for material segregation; therefore two methods will be tested in this master thesis to examine if material segregation occurs.The laboratory work shows that when a crushed fine filter material is compacted with double compaction energy compared to standard energy, it obtained a higher dry density and lower air-void content, already at lower water content. Only setup 2, where the material was vibrating in a cylinder, turned out to be an appropriate method for study material segregation, although much can be improved for enhanced results. Such as use a transparent cylinder that gives opportunity to see what occurs and measure layers that are formed.
Place, publisher, year, edition, pages
2013. , 95 p.
Teknik, krossat bergmaterial, packning, materialseparation
IdentifiersURN: urn:nbn:se:ltu:diva-57663Local ID: e4f4229a-2595-406f-ab89-7d025c7b1a47OAI: oai:DiVA.org:ltu-57663DiVA: diva2:1031051
Subject / course
Student thesis, at least 30 credits
Civil Engineering, master's level
Validerat; 20130521 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved