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Use of Macro Basalt Fibre Concrete for Marine Applications
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures. NTNU i Ålesund.
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Deterioration of concrete structures due to the corrosion of embedded steel is a well-known universal problem. Norway with its numerous bridges, ports, offshore and floating structures along its coastline, is also encountered with corrosion degradation. The harsh environment of the Norwegian Sea regarding its low temperature, wind, and waves, makes the design and construction of marine structures more demanding. In recent years, usage of sustainable composite materials in the field of structural engineering has been rising. The usage of natural fibre reinforced polymer materials in the form of reinforcement bars or macro fibres with a low density, high strength, and excellent corrosion resistance, gives us better choices for the design and construction of marine structures. Our knowledge about the fibre reinforced self-compacting concrete has increased as a result of introducing it as a building material some decades ago. However, more research is still needed when it comes to the application of new types of fibres. This thesis is a result of this need, whereby the author has done two series of experimental programmes regarding the subject. In the first series, the flow characteristics of fresh state, conventional and self-compacting macro basalt fibre concrete were studied. In the second series, mechanical properties of high performance and medium strength macro basalt fibre concrete including the post-cracking behaviour, compressive strength and electrical resistivity were in focus. The findings were presented in three appended papers and the extended summary composing this thesis. Additionally, the thesis presents an overview of the design procedure of floating concrete structures and the possibility of using macro basalt fibre concrete via a case study. The author’s literature review shows that basalt fibres have an adequate resistance against alkali environment of the concrete matrix and corrosive environment of seawater.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. , xiv, 35 p.
Series
TRITA-BKN. Bulletin, ISSN 1103-4270 ; 140
Keyword [en]
Concrete Barges, Reinforcement Corrosion, Floating Structures, Macro Basalt Fibres, Self-Compacting Fiber Concrete
National Category
Civil Engineering
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-188010OAI: oai:DiVA.org:kth-188010DiVA: diva2:933061
Presentation
2016-06-10, B1, Kungliga Tekniska högskolan, Brinellvägen 23, KTH-Campus, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20160607

Available from: 2016-06-07 Created: 2016-06-03 Last updated: 2016-06-07Bibliographically approved
List of papers
1. An Initial Investigation of the Possibility to Use Basalt Fibres for More Durable Concrete Structures in Norwegian Fish Farming
Open this publication in new window or tab >>An Initial Investigation of the Possibility to Use Basalt Fibres for More Durable Concrete Structures in Norwegian Fish Farming
2014 (English)Conference paper, Published paper (Refereed)
Abstract [en]

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.

Place, publisher, year, edition, pages
Oslo: , 2014
Keyword
Reinforcement, Fibres, Corrosion, Sustainable, Fish Farming Barges
National Category
Infrastructure Engineering Building Technologies
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-188007 (URN)987-82-8208-043-9 (ISBN)
Conference
Proceedings of the XXII Nordic Concrete Research Symposium Reykjavik, Iceland 2014
Note

QC 20160607

Available from: 2016-06-02 Created: 2016-06-02 Last updated: 2016-06-07Bibliographically approved
2. Properties of Fresh Macro Basalt Fibre (MiniBar) Self-Compacting Concrete (SCC) and Coventional Slump Concrete (CSC) Aimed for Marine Applications
Open this publication in new window or tab >>Properties of Fresh Macro Basalt Fibre (MiniBar) Self-Compacting Concrete (SCC) and Coventional Slump Concrete (CSC) Aimed for Marine Applications
2015 (English)In: Nordic Concrete Research, ISSN 0800-6377, Vol. 52, no 1, 43-61 p.Article in journal (Refereed) Published
Abstract [en]

Macro basalt fibres (MiniBar) with high corrosion resistance could be a suitable material in fibre concrete for marine applications. Due to the lack of knowledge about macro basalt fibre concretes (BFCs), the main objective of this paper is to assess the fresh state properties of macro basalt fibre conventional slump concrete and self-compacting concrete as the first step of developing BFC for concrete barges for fish farming on the west coast of Norway. To satisfy the requirements for marine applications, DNV and NS-EN standard rules are employed as the basis for the durability performance design. The concrete mix is designed to achieve densely compacted matrix by using the modified Andreasen & Andersen model as the particle size distribution target. In this paper, slump, flow-ability, passing-ability, fibre dynamic segregation and also flow rate as an indication for viscosity of different BFCs are measured and analysed. The result shows that there is a possibility to produce BF-SCCs with a fibre content of 1.15%. The fibres have an aspect ratio of 65.15. In addition, the mixture composed of a maximum gravel size of 16 mm shows a higher flowability in comparison with the maximum gravel size of 12 mm.

Place, publisher, year, edition, pages
Ålesund: NORSK BETONGFORENING, 2015
Keyword
Macro Basalt Fibre, Self-Compacting Concrete, Marine Application, Particle Packing Model
National Category
Infrastructure Engineering Building Technologies
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-188004 (URN)
Note

QC 20160607

Available from: 2016-06-02 Created: 2016-06-02 Last updated: 2017-11-30Bibliographically approved
3. Flexural Behaviour of Medium-Strength and High-Performance Macro Basalt Fibre Concrete Aimed for Marine Applications
Open this publication in new window or tab >>Flexural Behaviour of Medium-Strength and High-Performance Macro Basalt Fibre Concrete Aimed for Marine Applications
(English)In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873Article in journal (Other academic) Submitted
Abstract [en]

This paper addresses the flexural behaviour of medium-strength and high-performance concrete reinforced with recently developed macro fibres made of basalt fibre reinforced polymer (BFRP) with the intended use in marine applications. Four different fibre volume fractions and two different aspect ratios were investigated. Mechanical properties of fibre concrete were studied through an experimental programme consisting of 18 beam specimens and 45 cylindrical samples. Electrical resistivity testing was conducted to evaluate the performance of the concrete against chloride ingress. Three-point bending test was performed on beam specimens to assess the load-crack mouth opening displacement and load-mid span deflection curves, and to study their flexural behaviour, toughness, and ductility.

Since the operation of marine structures (concrete barges) starts minimum two months after the construction of concrete part, the hardened properties were also evaluated after sixty days. The results from the experimental tests indicated that the enhancement of concrete mechanical properties, including the toughness and ductility, were directly associated with the fibre content and concrete compressive strength. The post-cracking capacity of fibre concrete was found to be a function of the fibre volume fraction and the concrete compressive strength. Furthermore, the experiment showed that for the similar fibre content, fibres with an aspect ratio of 65 had a greater equivalent flexural strength, and the fibres with the aspect ratio of 83 had a higher post-cracking peak values.

Place, publisher, year, edition, pages
Springer
National Category
Infrastructure Engineering Building Technologies
Identifiers
urn:nbn:se:kth:diva-187996 (URN)
Note

QC 20160607

Available from: 2016-06-02 Created: 2016-06-02 Last updated: 2017-11-30Bibliographically approved

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