| 1. |
- Bissonnette, B., et al.
(author)
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Recommendations for the repair, the lining or the strengthening of concrete slabs or pavements with bonded cement-based material overlays
- 2013
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In: Materials and Structures. - : Springer. - 1359-5997 .- 1871-6873. ; 46:3, s. 481-494
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Journal article (peer-reviewed)abstract
- The recommendations presented in this publication are inspired by the State of the Art Report edited by the RILEM Technical Committee TC 193 RLS Bonded cement-based material overlays for the repair, the lining or the strengthening of slabs and pavements. The objective is to lay out all the practical aspects to be considered in the design of concrete overlay.bonded concrete overlay process, assessment of the existing structure, surface preparation, overlay materials, design methods, construction procedure and quality control/assurance system, and maintenance.
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| 2. |
- Destrée, Xavier, et al.
(author)
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Steel fibre reinforced concrete in free suspended slabs : Case study of the Swedbank Arena in stockholm
- 2012
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In: fib Symposium 2012. - 9789198009811 ; , s. 97-100
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Conference paper (peer-reviewed)abstract
- The total replacement of traditional rebars with steel fibres is now completely routine for 19 years in applications such as industrial and commercial suspended slabs resting on pile grids. In Stockholm, the Swedbank Arena foundation slabs have been completed according to that long successful experience. Its foundation slabs span from 3 m to 5 m each way, with span to depth ratios from 10 to 20. The foundation slab was designed according to Belgian praxis but has been compared with Swedish praxis. The steel fibre reinforced concrete (SFRC) mixes, which contain up to 50 kg/m3 of steel fibres, were also fully pumpable and did not need any poker vibrating. Significant time and material cost savings were then achieved compared with traditional reinforced concrete. Therefore SFRC enables a lean design with a better carbon footprint.
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| 5. |
- Hedebratt, Jerry, et al.
(author)
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Full-scale test of a pile supported steel fibre concrete slab
- 2014
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In: Materials and Structures. - : Springer Science and Business Media LLC. - 1359-5997 .- 1871-6873. ; 47:4, s. 647-666
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Journal article (peer-reviewed)abstract
- The aim of the short-term studies is to investigate the structural behaviour of pile supported slabs made of steel fibre concrete (SFC) only and combined reinforced steel fibre concrete. The studies include tests on an elevated slab where a combination of reinforcement bars and steel fibres have been used in one half of the slab and SFC only in the other half. The tests were performed on a column-supported elevated slab that simulates a half scale model of an industrial pile-supported floor slab. The short-term tests showed considerable structural and crack arresting performance that also increased with a higher dosage of fibres. A small addition of conventional reinforcement bars further increased the ultimate load capacity P (Max). P (Max) was in the range of 125-298 kN for the two types of slab. The results indicate that SFC can be used with verifiable results in structural applications for elevated slabs and pile-supported floor slabs despite that the material testing from the ordered SFC showed a larger scatter in properties and that the calculated load capacities were only 40-220 kN. Main causes of deviance are arch and membrane effects.
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| 6. |
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| 7. |
- Mohammadi Mohaghegh, Ali, et al.
(author)
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An Initial Investigation of the Possibility to Use Basalt Fibres for More Durable Concrete Structures in Norwegian Fish Farming
- 2014
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Conference paper (peer-reviewed)abstract
- Reinforcement corrosion in concrete structures in the harsh environment of the humid and cold climate of the Norwegian west coast is one of the most challenging problems pertaining to the design and construction of marine concrete structures. Using new materials with a higher strength and durability than steel reinforcement can be a good solution in such circumstances. In our study we investigate the use of new forms of macro fibres termed MiniBars made from basalt fibres. The paper presents our preliminary findings indicating that basalt fibres might provide more sustainable reinforcement in concrete barges.
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| 8. |
- Silfwerbrand, Johan L.
(author)
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Improving preventive bridge maintenance
- 2010
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In: Recent advances in maintenance and repair of concrete bridges. - : American Concrete Institute. - 9781618392053 ; , s. 67-78
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Conference paper (peer-reviewed)abstract
- During the last decade, the Swedish Road Administration (SRA) has transferred resources from corrective to preventive bridge maintenance. Presently, 10 to 15 percent of the budget is devoted to preventive maintenance whereas corrective maintenance, repair, and reconstruction comprise the remaining 85 to 90 percent. This reallocation has resulted in considerable efficiency gains but further savings are likely to be large. Preventive maintenance aims at measures to maintain the function of the bridge structure. Frequent measures include water washing, cleaning, vegetation removal, crack repair, material refill, and stretching of bridge railings. SRA has defined a series of technical requirements to harmonize the preventive bridge maintenance. Several technical requirements state that a structural element or element part "should be 95 percent clean". SRA has also developed methods to verify that the technical requirements are fulfilled. However, the scientific basis for the relationship between the technical requirements and the function of the bridge structure is unknown or weak. The verification methods are not always unquestionable. The paper contains a critical review of the technical demands for preventive bridge maintenance in Sweden. Do they adequately promote durability and long-lasting service life? Are the prescribed requirement levels appropriate? Could the technical requirements be replaced by other and better requirements? How do they look like in an international comparison? There is a general belief that performance-specified contracts would be more cost-effective than other contract types. Do the Swedish demands facilitate or obstruct performance-specified contracts for bridge maintenance? The questions are discussed in the paper that also contains a summary of a Swedish pilot study conducted at the Swedish Cement and Concrete Research Institute.
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| 9. |
- Silfwerbrand, Johan L., et al.
(author)
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Reducing Crack Risk in Industrial Concrete Floors
- 2014
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In: ACI Materials Journal. - : American Concrete Institute. - 0889-325X .- 1944-737X. ; 111:6, s. 681-689
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Journal article (peer-reviewed)abstract
- Cracking and curling are two important problems in industrial concrete floors. In many practical cases, it is easier to design the concrete floor slab for mechanical loads than for shrinkage stresses. This paper proposes a simple equation that mirrors the major factors influencing the crack risk in concrete floor slabs. By using this equation, the industrial floor designer or contractor can make a proper material selection that leads to a substantially reduced crack risk. Tests on strength, free shrinkage, restrained shrinkage, and flexural creep support this hypothesis. Furthermore, the use of shrinkage-reducing admixtures (SRAs) seems to not only reduce the free shrinkage but also maintains the beneficial condition of substantial creep that leads to shrinkage stress reduction.
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