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- Hedlund, Hans, et al.
(författare)
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Analysis of early age cracking in HPC structures
- 1999
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Ingår i: Utilization of high strength/high performance concrete : proceedings. - Oslo : Norsk Betongforening. - 8291341257 ; , s. 1134-1143
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Konferensbidrag (refereegranskat)
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- Hedlund, Hans, et al.
(författare)
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Hardening technology for concrete structures
- 1997
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Ingår i: Advanced design of concrete structures. - Barcelona : International Center for Numerical Methods in Engineering (CIMNE). - 8487867944 ; , s. 313-318
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Konferensbidrag (refereegranskat)
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| 10. |
- Hedlund, Hans, et al.
(författare)
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Härdningsstyrning av betongkonstruktioner
- 1996
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Ingår i: Byggforskning : Byggforskningsrådets tidning för en bättre byggd miljö. - 1102-3686. ; :3, s. 38-39
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Tidskriftsartikel (populärvet., debatt m.m.)
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- Westman, Gustaf
(författare)
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Concrete creep and thermal stresses : new creep models and their effects on stress development
- 1999
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis deals with the problem of creep in concrete and its influence on thermal stress development. New test frames were developed for creep of high performance concrete and for measurements of thermal stress development. Tests were performed on both normal strength and high performance concretes. Two new models for concrete creep are proposed. Firstly, a viscoelastic model, the triple power law, is supplemented with two additional functions for an improved modelling of the early age creep behaviour. Secondly, a new engineering creep model is proposed suited for design purposes. The basic feature of this model is based on the creep expressions in CEB/FIP Model Code 90. With both models good agreement were obtained with test results. The investigation on the influence of creep on thermal stress development showed that thermal stresses cannot be accurately evaluated without a correct consideration of the viscoelastic behaviour. Creep response during the three first days after load application seems to be the most important part of the creep spectra.
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| 19. |
- Westman, Gustaf
(författare)
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Creep and relaxation of high performance young concrete
- 1996
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Ingår i: Fourth International Symposium on Utilization of High Strength/High Performance Concrete. - Paris : Presses Ponts et Chaussées. - 2859782583 ; , s. 367-376
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Konferensbidrag (refereegranskat)
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| 20. |
- Westman, Gustaf, et al.
(författare)
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Creep and relaxation of young concrete
- 1993
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Ingår i: Proceedings. - Oslo : Norsk Betongforening. - 8291341028 ; , s. 65-67
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Konferensbidrag (refereegranskat)
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| 21. |
- Westman, Gustaf, et al.
(författare)
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Development of a relaxations test-frame
- 1994
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Ingår i: Nordic Concrete Research. - 0800-6377. ; 15, s. 89-96
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes how relaxation tests on young concrete are performed at the Division of Structural Engineering at Luleá University of Technology. The development of a new test machine is presented and some results from pilot tests are given. The presented test method can be used to simulate different thermal stress conditions in the casting of massive concrete structures. This means that it may reduce the need for complicated and expensive full scale tests to ensure that no cracking takes place in newly cast concrete structures. A one meter long concrete beam is poured directly into a form in a steel frame. Temperated air is blown into a box containing the specimen and is circulated around it. In this way the specimen can be given a temperature development which is representative for a specific concrete structure. One of the short ends of the specimen is fixed in the steel frame and the other end is free to move in the longitudinal direction. The position of the free end of the specimen is kept within 0.2 µm from the initial position by a servo-hydraulic cylinder. In this way, nearly 100% restraint is obtained. The force acting on the cylinder is directly proportional to the stresses occurring in the concrete specimen.
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| 22. |
- Westman, Gustaf
(författare)
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Temperaturspänningar i betong
- 1995
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Ingår i: Bygg och Teknik. - 0281-658X .- 2002-8350. ; :7, s. 19-21
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Tidskriftsartikel (populärvet., debatt m.m.)
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