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Flexural Behaviour of Medium-Strength and High-Performance Macro Basalt Fibre Concrete Aimed for Marine Applications
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures. NTNU i Ålesund.
(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
National Category
Infrastructure Engineering Building Technologies
URN: urn:nbn:se:kth:diva-187996OAI: diva2:932954

QC 20160607

Available from: 2016-06-02 Created: 2016-06-02 Last updated: 2016-06-08Bibliographically approved
In thesis
1. Use of Macro Basalt Fibre Concrete for Marine Applications
Open this publication in new window or tab >>Use of Macro Basalt Fibre Concrete for Marine Applications
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.
TRITA-BKN. Bulletin, ISSN 1103-4270 ; 140
Concrete Barges, Reinforcement Corrosion, Floating Structures, Macro Basalt Fibres, Self-Compacting Fiber Concrete
National Category
Civil Engineering
Research subject
Civil and Architectural Engineering
urn:nbn:se:kth:diva-188010 (URN)
2016-06-10, B1, Kungliga Tekniska högskolan, Brinellvägen 23, KTH-Campus, Stockholm, 10:00 (English)

QC 20160607

Available from: 2016-06-07 Created: 2016-06-03 Last updated: 2016-06-07Bibliographically approved

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