| 1. |
- Anderberg, Anders, et al.
(författare)
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Hydroxide ion concentration at an interface between concrete and a self-levelling flooring compound
- 2007
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Ingår i: Nordic Concrete Research. - 0800-6377. ; 36, s. 37-47
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- This article presents results from measurements of hydroxide ion transport between a concrete and a floor screed of a lower alkalinity than the concrete. As many floor coverings and floor adhesives are sensitive to high alkaline conditions it is important to know how hydroxide ions are transported to be able to evaluate the long-term function of floor constructions. It was found that only minor transport of hydroxide ions occurs in the hygroscopic moisture range. One conclusion is therefore that a floor screed of lower alkalinity may protect sensitive floorings from the high alkalinity present in concrete.
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| 2. |
- Ansell, Anders, et al.
(författare)
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Modelling of thermally induced cracking of a concrete buttress dam
- 2008
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Ingår i: Nordic Concrete Research. - 0800-6377. ; 38, s. 69-88
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Tidskriftsartikel (refereegranskat)abstract
- Some of the larger hydropower dams in Sweden are buttress dams, consisting of up to 100 concrete monoliths formed by a front plate with a supporting buttress. Cracks have been observed in some dams, through the buttresses and at the base close to the rock foundation. The combined effects of restrained thermal displacements and loads caused by water are studied through finite element analysis. The results demonstrate the use of a non-linear material model and show that it is possible to follow the formation and propagation of the cracks. The analyses indicate that thermal stresses in combination with the loads caused by external water pressure are the reason for the cracking.
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| 3. |
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| 4. |
- Emborg, Mats, et al.
(författare)
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Industrial concrete construction for a better economy and working environment : possibilities and obstacles with self compacting concrete
- 2008
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Ingår i: Nordic Concrete Research. - 0800-6377. ; :2, s. 47-59
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Tidskriftsartikel (refereegranskat)abstract
- The implementation of SCC together with new reinforcement and form techniques make it possible to increase the degree of industrialisation. It has been found in research at LTU that detailed planning and optimization of the building process, are essential utensils to successfully introduce such new techniques. However, also important is to address the technical issues hindering the marketing of SCC. Such issues are the robustness of the concrete and he surface quality. Thus, a discussion is given in the article on the optimization of robust SCC mixes and test results both from laboratory and building site as well as how criteria of SCC can be defined.
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| 5. |
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| 6. |
- Magnusson, Johan, 1967-
(författare)
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Fibre reinforced concrete beams subjected to air blast loading
- 2006
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Ingår i: Nordic Concrete Research. - 0800-6377. ; :35, s. 18-34
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Tidskriftsartikel (refereegranskat)abstract
- This paper involves testing of steel fibre reinforced concrete(SFRC) beams subjected to static and dynamic loads. Thedynamic load was generated by a detonating explosive charge.The work focused upon studying the mechanical behaviour ofthe beams. The concrete compressive strength varied between36 MPa and 189 MPa with a fibre content of 1.0 percent byvolume. Two different fibre lengths having constant length-todiameterratio were employed. The experimental results indicatethat the toughness is reduced when increasing the compressivestrength and the dynamic strength is higher than thecorresponding static strength.
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| 7. |
- Persson, Bertil
(författare)
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Silica fume concrete after 155 months
- 2005
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Ingår i: Nordic Concrete Research. - 0800-6377. ; :34, s. 34-53
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Long-term experimental studies on the interaction between silica fume and Portland cement in concrete subjected to air, water or sealed curing, are outlined. For this purpose 6000 kg of eight qualities of concrete were studied at 5 ages over a period of 155 months. Half of the concrete contained silica fume. Parallel studies of strength, hydration and rela-tive humidity were carried out. After 155-month tests were also per-formed on the salt freezing and thawing frost resistance of the concrete. The results show a great effect of silica fume on compressive and split-ting tensile strength, hydration, relative humidity in low-water-cement ratio concrete and on salt-thaw frost resistance of silica fume compared to the effect of Portland cement. The work was performed 1989 - 2003.
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| 8. |
- Plos, Mario, et al.
(författare)
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Structural assessment of concrete bridges
- 2008
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Ingår i: Nordic Concrete Research. - 0800-6377. ; :2, s. 99-111
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Tidskriftsartikel (refereegranskat)abstract
- The paper summarizes the work on concrete bridges performed in the EU project Sustainable Bridges. The work provides enhanced assessment methods that are able to provide higher load-carrying capacities and longer fatigue lives for exixixting concrete railway bridges. The work is also presented in a Guideleine available at www.sustainablebridges.net
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| 9. |
- Plos, Mario, 1963, et al.
(författare)
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Structural assessment of concrete bridges
- 2007
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Ingår i: Nordic Concrete Research. - 0800-6377. ; 30:2, s. 89-102
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Tidskriftsartikel (refereegranskat)abstract
- The paper summarises the work on concrete bridges performed in the EU project Sustainable Bridges. The work provides enhanced assessment methods that are able to prove higher load-carrying capacities and longer fatigue lives for existing concrete railway bridges, and is implemented in a Guideline [1]. Methods for determination of in-situ material properties and advanced methods for structural analysis were developed. One main focus was non-linear analysis, since these provides the greatest potential for discovering of additional sources for load-carrying capacity. Furthermore, methods to assess the remaining structural resistance of deteriorated concrete bridges with respect to corrosion and fatigue were developed.
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| 10. |
- Plos, Mario, 1963, et al.
(författare)
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Structural assessment of concrete bridges
- 2008
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Ingår i: Nordic Concrete Research. - 0800-6377. ; 38:2008/2, s. 89-101
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Tidskriftsartikel (refereegranskat)abstract
- The paper summarises the work on concrete bridges performed in the EU project Sustainable Bridges. The work provides enhanced assessment methods that are able to prove higher load-carrying capacities and longer fatigue lives for existing concrete railway bridges, and is implemented in a Guideline [1]. Methods for determination of in-situ material properties and advanced methods for structural analysis were developed. One main focus was non-linear analysis, since these provides the greatest potential for discovering of additional sources for load-carrying capacity. Furthermore, methods to assess the remaining structural resistance of deteriorated concrete bridges with respect to corrosion and fatigue were developed.
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