| 1. |
- Hedenblad, Göran, et al.
(författare)
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Den problematiska kryprumsgrunden
- 1990
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Ingår i: Byggindustrin. - 0349-3733. ; :29, s. 39-41
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 2. |
- Hedenblad, Göran, et al.
(författare)
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Ett mögelsäkrare kryprum med konventionell teknik
- 1990
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Denna seminarieuppsats påvisar dels de avsevärda risker för mögelpåväxt som föreligger vid normala kryprum kombinerade med bjälklag i trä samt dels en enkel metod att stävja problemen nämligen medelst markisolering i kryprummet bestående av lättklinker.
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| 3. |
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| 4. |
- Persson, Bertil
(författare)
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A comparison between mechanical properties of self-compacting concrete and the corresponding properties of normal concrete
- 2001
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Ingår i: Cement and Concrete Research. - 0008-8846. ; 31:2, s. 193-198
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Tidskriftsartikel (refereegranskat)abstract
- An experimental and numerical study on mechanical properties, such as strength, elastic modulus, creep and shrinkage, of Self-Compacting Concrete, SCC, and the corresponding properties of Normal Compacting concrete, NC, is outlined in this article. The study included eight mix proportions of sealed or air-cured specimens with water-binder ratio, w/b, varying between 0.24 and 0.80. Half of the mixes studied were based on NC. The age at loading of the concretes in the creep studies varied between 2 and 90 days. Four different stress to strength levels were studied. Parallel studies were performed on strength, fc, and relative humidity, RH. The results show that elastic modulus, creep and shrinkage of SCC did not differ significantly from the corresponding properties of NC. The ongoing study was started in 1997.
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| 5. |
- Persson, Bertil
(författare)
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A NORDTEST Method for Verification of Self-desiccation in Concrete
- 2001
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Ingår i: Cement and Concrete Research. - 0008-8846. ; 31:2, s. 199-203
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- This article outlines a new NORDTEST method for verification of self-desiccation in concrete. The method involves measurements of the internal relative humidity, RH, on pieces of concrete at one month’s age. The measured RH is then compared with the requirements according to the owner. The new NORDTEST method for self-desiccation permits requirements to be made of the self-desiccation of HPC in accordance with present demands on strength. During the development of the test method experimental studies were carried out on nine concretes with w/c varying between 0.32 and 0.50. Half of the concretes contained five per cent silica fume. The experiments showed a significant effect of cement type, silica fume and w/c on the self-desiccation in concrete. The test method was also verified in the field, both when manufacturing the concrete and on site. The method was developed after co-operation between the Technical University of Denmark and Lund University. The experimental studies were performed at Division of Building Materials, Lund Institute of Technology, Lund, 1995-1999.
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| 6. |
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| 8. |
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| 9. |
- Persson, Bertil, et al.
(författare)
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Basic creep of high-strength concrete at early ages
- 1993
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Ingår i: Creep and shrinkage of concrete : proceedings of the fifth International RILEM Symposium / RILEM proceedings 22. - 0419186301 ; , s. 523-528
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 10. |
- Persson, Bertil
(författare)
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Basic Deformations of High-Performance Concrete at Early Ages.
- 1997
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Ingår i: Nordic Concrete Research. - 0800-6377. ; 20, s. 59-74
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Creep and shrinkage are two major problems to be discussed in concrete design. Basic creep is studied during constant loading, temperature and moisture conditions, i.e. no exchange of moisture takes place to or from the specimen during the test period. In this paper an experimental and numerical study of basic creep of High Performance Concrete (HPC) is outlined. For this purpose cylinders and cubes were cast. Quasi-instantaneous deformation and basic creep including autogenous shrinkage were observed over 3 years. Analysis's of elastic modulus, early creep and long-term creep including autogenous shrinkage are presented. HPC autogenous shrinkage had a great influence on the results. The autogenous shrinkage in its turn is caused by the self-desiccation of HPC. The study was carried out in 1992 through 1994 at Lund Institute of Technology, Division of Building Materials, Lund, Sweden.
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