Numerical modelling of cracking in Steel Fibre Reinforced Concretes (SFRC) structures

Previous research studies have indicated that using fibres to improve crack resistance and applying expansive agent (EA) to compensate shrinkage are both effective methods to mitigate shrinkage cracking of concrete, and the additions of both fibres and EA can enhance the other performance attributes of concrete. In this study, an EA was added to fibre reinforced concrete (FRC) to produce concrete mixes with various water/binder (W/B) ratios, steel fibre (SF) contents and EA contents for testing of their workability and compressive properties. The test results showed that adding EA would slightly increase the superplasticiser (SP) demand and decrease the compressive strength, Young’s modulus and Poisson’s ratio, but significantly improve the toughness and specific toughness of the steel FRC produced. Such improvement in toughness may be attributed to the pre-stress of the concrete matrix and the confinement effect of the SFs due to the expansion of the concrete and the restraint of the SFs against such expansion.

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Workability Characteristic Properties of Concrete with Varying Percentages of Steel Fibre

Indian Journal Of Applied Research ◽

10.15373/2249555x/july2014/70 ◽

2011 ◽

Vol 4 (7) ◽

pp. 230-233

Author(s):

Dr. Deepa A Sinha ◽

Keyword(s):

Steel Fibre

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Structural performance of steel fibre reinforced concrete — Part IV. Toughness properties

International Review of Applied Sciences and Engineering ◽

10.1556/irase.5.2014.2.3 ◽

2014 ◽

Vol 5 (2) ◽

pp. 119-125

Author(s):

I. Kovács

Keyword(s):

Reinforced Concrete ◽

Steel Fibre ◽

Fibre Orientation ◽

Reinforced Concrete Beams ◽

Fibre Reinforcement ◽

Fibre Reinforced Concrete ◽

Flexural Toughness ◽

Steel Fibre Reinforced Concrete ◽

Set Up ◽

Flexural Tests

The present paper of a series deals with the experimental characterisation of flexural toughness properties of structural concrete containing different volume of hooked-end steel fibre reinforcement (75 kg/m3, 150 kg/m3). Third-point flexural tests were carried out on steel fibre reinforced concrete beams having a cross-section of 80 mm × 85 mm with the span of 765 mm, hence the shear span to depth ratio was 3. Beams were sawn out of steel fibre reinforced slab elements (see Part I) in order to take into consideration the introduced privilege fibre orientation (I and II) and the position of the beam (Ba-a, Ba-b, Ba-c) before sawing (see Part I). Flexural toughness properties were determined considering different standard specifications, namely the method of the ASTM (American Standards for Testing Materials), the process of the JSCE (Japan Society of Civil Engineering), and the final proposal of Banthia and Trottier for the post cracking strength. Consequently, behaviour of steel fibre reinforced concrete was examined in bending taking into consideration different experimental parameters such as fibre content, concrete mix proportions, fibre orientation, positions of test specimens in the formwork, while experimental constants were the size of specimens, the type of fibre used and the test set-up and test arrangement.

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