| 1. |
- Al-Ayish, Nadia, et al.
(författare)
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Environmental impact of concrete structures reinforced with GFRP bars : A simplified study on columns
- 2019
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Ingår i: Proceedings of the fib Symposium 2019. - : International Federation for Structural Concrete. - 9782940643004 ; , s. 1998-2005
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Konferensbidrag (refereegranskat)abstract
- Concrete has a significant influence on the global warming due to its high usage in the construction industry. There are a few different strategies to increase the sustainability potential of concrete structures. Most of these strategies involve reduction of the total clinker content. One strategy, which is often neglected due to its complexity, is to increase the durability of the concrete structure. By increasing the durability, the need for repair and maintenance is reduced and thus less resources are consumed during the service life. One of the main deterioration mechanisms in concrete structures is the corrosion of steel reinforcement. A strategy to increase the service life of concrete structures in harsh environment would therefore be to increase the durability of concrete or to use low- or non-corrosive reinforcement instead of traditional steel reinforcement. This paper focuses on the latter. Glass fibre reinforced polymer (GFRP) bars are non-corrosive and have emerged as an alternative to steel bars in reinforced concrete structures in harsh environment. They have other mechanical properties than steel and opens for alternative mix designs for concrete. However, the environmental impact of concrete structures reinforced with GFRP bars has not been fully investigated and most life-cycle assessment (LCA) studies have an exchange ratio of 1:1 between GFRP and steel bars despite differences in the mechanical properties. This paper studies the climate impact of concrete columns reinforced with GFRP bars through an LCA methodology, focusing on the functional unit.
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| 2. |
- Al-Ayish, Nadia
(författare)
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Environmental Impact of Concrete Structures - with Focus on Durability and Resource Efficiency
- 2017
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Concrete is essential for the construction industry with characteristic properties that make it irreplaceable in some aspects. However, due to the large volumes consumed and the energy intense cement clinker production it also has a notable climate impact. In order to reach the international and national sustainability goals it is therefore important to reduce the climate impact of concrete structures.There are many ways to influence the environmental impact of concrete and a detailed analysis is one of the actions that could push the industry and the society towards a sustainable development. The purpose of this research is to evaluate the environmental impact of concrete structures and the built environment and to highlight the possibilities to reduce that impact with choice of concrete mix and innovative design solutions.A life cycle assessment (LCA) was carried out to analyze the environmental impact of two thin façade solutions with innovative materials and to evaluate influences of different greenhouse gas reducing measures on concrete bridges. The influence of supplementary cementitious materials (SCM) in terms of climate impact and durability was also analyzed.The results indicate that SCMs have a twofold effect on the climate impact of reinforced concrete structures. Not only do they reduce the greenhouse gases through cement clinker replacement but also by an improvement of durability regarding chloride ingress. Currently, this is not considered in the regulations, which makes it difficult to foresee in LCA at early design stages. The results also show great possibilities to reduce the climate impact through different measures and design alternatives and the need for further development of products and solutions.
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| 3. |
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| 4. |
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| 5. |
- Al-Ayish, Nadia, et al.
(författare)
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The influence of supplementary cementitious materials on climate impact of concrete bridges exposed to chlorides
- 2018
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Ingår i: Construction and Building Materials. - : Elsevier BV. - 0950-0618 .- 1879-0526. ; 188, s. 391-398
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Tidskriftsartikel (refereegranskat)abstract
- In order to reach a specific service life of reinforced concrete structures a certain cover thickness is needed. At present, this is regulated by national standards that also limit the amount and type of supplementary cementitious materials in different exposure environments. The regulations do not, however, consider the actual durability performance of concrete with supplementary cementitious materials. As a consequence, the LCA results might be misleading. This paper shows the environmental impact of concrete with supplementary cementitious materials in chloride environment considering their specific performances. Prescriptive and performance based service life prediction models for chloride ingress are applied and compared.
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| 6. |
- Blanksvärd, Thomas, et al.
(författare)
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Textile reinforced concrete sandwich panels
- 2011
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Ingår i: Nordic Concrete Research. - Oslo : Norsk Betongforening. - 9788282080255 ; , s. 517-520
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Konferensbidrag (refereegranskat)
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| 7. |
- Dalenbäck, Jan-Olof, 1954, et al.
(författare)
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Ställ tekniska egenskapskrav och använd deklarationerna
- 2014
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Ingår i: Energi & Miljö. - 1101-0568. ; 2014:4, s. 40-41
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Ta bort energikraven i BBR och ersätt dem med ändamålsenliga egenskaps¬krav. Gör sedan energideklarationerna värda namnet genom att inkludera hushålls- och verk¬sam¬hets¬el så att de kan användas för att följa upp energi¬användningen. I anslutning till Boverkets regeringsuppdrag (N2014/75/E) att definiera nya energihus¬håll¬ningskrav, finns det all anledning att diskutera om vi är på rätt väg med de krav på bygg¬naders energi¬prestanda som ställs i Boverkets Byggregler (BBR). Speciellt om dess uppfyllelse ska vara juridiskt bindande.
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| 8. |
- During, Otto, et al.
(författare)
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Life cycle cost analysis on impregnated bridge edge beams
- 2014
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Ingår i: Restoration of Buildings and Monuments. - 1864-7251. ; 20:6, s. 441–446-
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Tidskriftsartikel (refereegranskat)abstract
- the edge beams. However, results from this study pointed out that in most cases there is a clear economic benefit to impregnate the bridge edge beams even if it has to be repeated every 15 years.
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