Fibre-reinforced high-strength concrete

Sirje Vares, Tarja Häkkinen

Research output: Book/ReportReportProfessional

Abstract

The publication comprises two experimental parts. In the first part, 14 different kinds of steel, polypropylene and polyacrylonitrile fibres are studied in order to make high-strength fibre-reinforced concrete. The effect of fibre type and volume on the load-deflection behaviour of FRC is studied and discussed. When the steel fibre volume fraction is low there is usually no significant increase in the "first crack" and flexural strengths, but the toughness of concrete can be significantly increased over that of plane matrix. Thin fibres with rather high specific surface area increase the most significantly the "first crack" strength of the composite. The effectiveness of increasing the fibre volume depends on the fibre type. Roughly speaking, the more effective the fibres are in terms of flexural strength, the more advantageous is the increase in fibre volume. On the other hand, the best fibres give the composite very good toughness already at low fibre contents. The fibre-spreading and slurry-infiltration method can be employed to make steel FRC with very high fibre content. The maximum obtainable fibre volume depends significantly on the stiffness and shape of the fibres. However, the mechanical properties of composites depend not only on the fibre volume content, but significantly on the properties of steel fibres. The relatively high specific surface area of the polymer fibres (PAN and PP) affects advantageously the "first crack" strength of the composite. The results indicate that the bending of PAN fibres to the high-strength matrix is too high in relation to their strength to provide the composite with good toughness. In the second part of the report the influence of aging on the load-deflection behaviour of different kinds of FRC is studied. Different matrices reinforced with steel or polypropylene fibre were subjected to aging and temperature and humidity changes. High-strength fibre-reinforced concrete composites, especially those reinforced by steel fibres can withstand large variation of temperature and humidity without the performance of fibres being significantly weakened.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages104
ISBN (Print)951-38-4398-X
Publication statusPublished - 1993
MoE publication typeNot Eligible

Publication series

NameVTT Publications
PublisherVTT
No.160
ISSN (Print)1235-0621
ISSN (Electronic)1455-0849

Fingerprint

Concretes
Fibers
Steel fibers
Composite materials
Toughness
Cracks
Specific surface area
Bending strength
Reinforced concrete
Steel
Polypropylenes
Atmospheric humidity
Aging of materials
Polyacrylonitriles
Infiltration
Volume fraction
Stiffness

Keywords

  • fiber reinforcement
  • high strength concretes
  • composite materials
  • composite structures
  • experimentation
  • polypropylene fibers
  • polyarcylonitrile fibers
  • steel fibers
  • loads (forces)
  • deflection
  • flexural strength
  • mechanical properties
  • cracking (fracturing)
  • toughness
  • aging tests (materials)
  • durability

Cite this

Vares, S., & Häkkinen, T. (1993). Fibre-reinforced high-strength concrete. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 160
Vares, Sirje ; Häkkinen, Tarja. / Fibre-reinforced high-strength concrete. Espoo : VTT Technical Research Centre of Finland, 1993. 104 p. (VTT Publications; No. 160).
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Vares, S & Häkkinen, T 1993, Fibre-reinforced high-strength concrete. VTT Publications, no. 160, VTT Technical Research Centre of Finland, Espoo.

Fibre-reinforced high-strength concrete. / Vares, Sirje; Häkkinen, Tarja.

Espoo : VTT Technical Research Centre of Finland, 1993. 104 p. (VTT Publications; No. 160).

Research output: Book/ReportReportProfessional

TY - BOOK

T1 - Fibre-reinforced high-strength concrete

AU - Vares, Sirje

AU - Häkkinen, Tarja

N1 - Project code: RAM0024051

PY - 1993

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N2 - The publication comprises two experimental parts. In the first part, 14 different kinds of steel, polypropylene and polyacrylonitrile fibres are studied in order to make high-strength fibre-reinforced concrete. The effect of fibre type and volume on the load-deflection behaviour of FRC is studied and discussed. When the steel fibre volume fraction is low there is usually no significant increase in the "first crack" and flexural strengths, but the toughness of concrete can be significantly increased over that of plane matrix. Thin fibres with rather high specific surface area increase the most significantly the "first crack" strength of the composite. The effectiveness of increasing the fibre volume depends on the fibre type. Roughly speaking, the more effective the fibres are in terms of flexural strength, the more advantageous is the increase in fibre volume. On the other hand, the best fibres give the composite very good toughness already at low fibre contents. The fibre-spreading and slurry-infiltration method can be employed to make steel FRC with very high fibre content. The maximum obtainable fibre volume depends significantly on the stiffness and shape of the fibres. However, the mechanical properties of composites depend not only on the fibre volume content, but significantly on the properties of steel fibres. The relatively high specific surface area of the polymer fibres (PAN and PP) affects advantageously the "first crack" strength of the composite. The results indicate that the bending of PAN fibres to the high-strength matrix is too high in relation to their strength to provide the composite with good toughness. In the second part of the report the influence of aging on the load-deflection behaviour of different kinds of FRC is studied. Different matrices reinforced with steel or polypropylene fibre were subjected to aging and temperature and humidity changes. High-strength fibre-reinforced concrete composites, especially those reinforced by steel fibres can withstand large variation of temperature and humidity without the performance of fibres being significantly weakened.

AB - The publication comprises two experimental parts. In the first part, 14 different kinds of steel, polypropylene and polyacrylonitrile fibres are studied in order to make high-strength fibre-reinforced concrete. The effect of fibre type and volume on the load-deflection behaviour of FRC is studied and discussed. When the steel fibre volume fraction is low there is usually no significant increase in the "first crack" and flexural strengths, but the toughness of concrete can be significantly increased over that of plane matrix. Thin fibres with rather high specific surface area increase the most significantly the "first crack" strength of the composite. The effectiveness of increasing the fibre volume depends on the fibre type. Roughly speaking, the more effective the fibres are in terms of flexural strength, the more advantageous is the increase in fibre volume. On the other hand, the best fibres give the composite very good toughness already at low fibre contents. The fibre-spreading and slurry-infiltration method can be employed to make steel FRC with very high fibre content. The maximum obtainable fibre volume depends significantly on the stiffness and shape of the fibres. However, the mechanical properties of composites depend not only on the fibre volume content, but significantly on the properties of steel fibres. The relatively high specific surface area of the polymer fibres (PAN and PP) affects advantageously the "first crack" strength of the composite. The results indicate that the bending of PAN fibres to the high-strength matrix is too high in relation to their strength to provide the composite with good toughness. In the second part of the report the influence of aging on the load-deflection behaviour of different kinds of FRC is studied. Different matrices reinforced with steel or polypropylene fibre were subjected to aging and temperature and humidity changes. High-strength fibre-reinforced concrete composites, especially those reinforced by steel fibres can withstand large variation of temperature and humidity without the performance of fibres being significantly weakened.

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KW - high strength concretes

KW - composite materials

KW - composite structures

KW - experimentation

KW - polypropylene fibers

KW - polyarcylonitrile fibers

KW - steel fibers

KW - loads (forces)

KW - deflection

KW - flexural strength

KW - mechanical properties

KW - cracking (fracturing)

KW - toughness

KW - aging tests (materials)

KW - durability

M3 - Report

SN - 951-38-4398-X

T3 - VTT Publications

BT - Fibre-reinforced high-strength concrete

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Vares S, Häkkinen T. Fibre-reinforced high-strength concrete. Espoo: VTT Technical Research Centre of Finland, 1993. 104 p. (VTT Publications; No. 160).