| 1. |
- Franzén, Gunilla, et al.
(författare)
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Terrasstabilisering : kunskapsdokument
- 2012
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Terrasstabilisering är en metod som används för att förbättra bärigheten vid grundläggning på finkorniga jordar med dålig bärighet. Metoden tillämpas för att förbättra bärigheten i terrassen till exempel för byggtransporter, men framförallt för att optimera överbyggnaden för den slutliga vägen. Metoden används i stor utsträckning utanför Sveriges gränser och har där visat sig ge väl fungerande konstruktioner. Syftet med studien har varit att samanställa befintlig kunskap om metodens möjligheter och begränsningar som ett led i att skapa möjligheter till en ökad användning av metoden. Dokumentet behandlar ytstabilisering av befintlig finkorning jord i väglinjen. Stabilisering av de obundna lagren i själva vägkonstruktionen omfattats inte av studien. Eftersom huvudsyftet har varit att studera metoden i sig, har fokus lagts på konventionella bindemedel såsom kalk, cement och slagg. Några resultat:•För att full ut kunna ta nytta av metodens fulla potential krävs utveckling och ökad erfarenhet av såväl utförande som hur kravformulering ska ske.•Metodens ekonomiska fördelar blir mest påtagliga om man betraktar anläggningen ur ett livscykelperspektiv.Under vissa förutsättningar så har metoden en potential att bidra till en ökad energieffektivitet.
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| 2. |
- Gáspár, Lászlo, et al.
(författare)
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Recycling reclaimed road material in hydraulically bound layers
- 2015
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Ingår i: Proceedings of the Institution of Civil Engineers. - : ICE Publishing. - 0965-092X .- 1751-7710. ; :3, s. 276-287
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Tidskriftsartikel (refereegranskat)abstract
- The European Direct-mat project provided a significant contribution to increasing recycling reclaimed road wastes. Part of the project was dedicated to the recycling of various reclaimed road materials in new hydraulically bound layers. This paper summarises the results of the project and the activities of the eight contributing European countries. Several examples from countries outside the project are also provided to give a comprehensive overview. The paper highlights the main trends of relevant practice worldwide (particularly in Europe) and draws conclusions for practitioners.
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| 3. |
- Hellman, Fredrik, et al.
(författare)
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Svenska erfarenheter av rivning samt återvinning av vägmaterial i nya vägar
- 2011
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- DIRECT-MAT (Dismantling and Recycling Techniques for Road Materials - Sharing knowledge and practices) is a European project in the Seventh Framework Programme. The project consists of 20 partners in 15 countries. The purpose of this project is, in a European perspective, share knowledge and experiences about recycling of road materials into new roads. The results will be presented in a web-based database where manuals, guides, national documents, references and literature studies are easily accessible. Case studies that exemplify the practical use of methods from the participating countries will also be available.The project is divided into four groups that concentrate on recycling of different types of road materials. They are: - unbound road materials, - hydraulically-bound road materials, - asphalt-based materials, - other materials (e.g. ash, slag, rubber tires, contaminated sediment and vegetation from ditches).This VTI report summarizes the Swedish experience of demolition, and recycling of road materials for use in new roads.
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| 4. |
- Åhnberg, Helen
(författare)
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Strength of Stabilised Soil - A Laboratory Study on Clays and Organic Soils Stabilised with different Types of Binder
- 2006
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Stabilisation of soft soils by deep mixing with binders is the most frequently used method of ground improvement in Sweden today, and is increasingly being used internationally. The most common binders employed are cement and lime, but a variety of other binders may also be used for stabilisation of soils. For further development of the deep mixing method, there is a need for more extensive research on the undrained and drained strength properties and behaviour of soils stabilised with various types of binders. The overall objective of the study presented in this thesis was to improve the understanding of some of the important aspects of the strength behaviour of stabilised soils. For this purpose, a series of laboratory tests was performed on four soils stabilised with different types of binders. The soils included two types of clay and two types of organic soil. Cement, lime, blastfurnace slag and fly ash in different combinations, alone and together with a number of admixtures, were used as binders. The laboratory testing was focused on the strength properties. However, a number of other basic properties of importance for the understanding of the strength behaviour of stabilised soils were also investigated, such as the density, water content, degree of saturation, permeability and the compression properties. Unconfined compression tests and triaxial tests were used to investigate the strength of the various samples stabilised in the laboratory. The unconfined compressive tests were performed mainly in order to study the effects of different binders on the increase in strength with time after stabilisation. The triaxial tests, conducted both as drained and undrained tests, were performed mainly to study the strength behaviour under various drainage and stress conditions. The influence of different testing procedures, such as different back pressure and rate of strain, was also studied. Both active and passive undrained triaxial tests were performed in order to investigate the strength anisotropy of the stabilised soils. The results provided illustrative examples of the effects of different binders on the increase in strength of stabilised soils, which may be linked to the chemical reactions taking place after mixing. In addition to the composition of the soil and the binder, a number of other factors also affect the strength of stabilised soil. The results show that the drainage conditions and the stresses acting on stabilised soil may have a considerable influence on the measured strength. A stress dependence of the undrained strength as well as the drained strength is evident from the test results. A quasi-preconsolidation pressure, which is governed not only by the stresses applied to the stabilised soil, but also by the cementation taking place during curing, is shown to influence the strength behaviour. An improved strength model is proposed that describes the strength behaviour in the same stress plane commonly used for natural unstabilised soils. It was concluded that although the type of binder may strongly affect the rate of strength increase and the final strength, the general strength behaviour is the same for soils stabilised by the most common binders. The strength and deformation properties of stabilised soils are similar to those of cemented and overconsolidated natural soils. The same set of parameters used to describe the strength of natural soils can also be used for stabilised soils.
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