Direct-tensile and flexural strength and toughness of high-strength fiber-reinforced cement composites with different steel fibers

AbstractThe effects of fiber reinforcenent; on the response of high strength fiber reinforced concrete in conmpression, tension and flexure are reviewed. Tradeoffs between the use of high fiber contents to achieve comiposite strength and ductility, and a reduction in matrix porosity to achieve high matrix strength are discussed. Methods used to increase composite strength include application of pressure after casting, addition of fly-ash, silica fumes and or sulerplasticizers to the cement matrix, and mixing high volurite contents of high strength stiff fibers.

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Influence of Hybrid Fibers on Toughness Behavior of High Strength Flowing Concrete

Archives of Civil Engineering ◽

10.2478/v.10169-011-0018-0 ◽

2011 ◽

Vol 57 (3) ◽

pp. 249-260 ◽

Cited By ~ 1

Author(s):

Eethar Thanon Dawood ◽

Mahyuddin Ramli

Keyword(s):

Compressive Strength ◽

Flexural Strength ◽

Modulus Of Elasticity ◽

Hybrid Composite ◽

High Strength ◽

Steel Fibers ◽

Hybrid Fibers ◽

Static Modulus ◽

Static Modulus Of Elasticity ◽

Strength And Toughness

Abstract This study investigates the use of steel fibers and hybrid composite with a total fibers content of 2% on the high strength flowing concrete and determines the density, compressive strength, static modulus of elasticity, flexural strength and toughness indices for the mixes. The results show that the inclusion of more than 0.5% of palm fibers in hybrid fibers mixes reduces the compressive strength. The hybrid fibers can be considered as a promising concept and the replacement of a portion of steel fibers with palm fibers can significantly reduce the density, enhance the flexural strength and toughness. The results also indicates that the use of hybrid fibers (1.5 steel fibers + 0.5% palm fibers) in specimens increases significantly the toughness indices and thus the use of hybrid fibers combinations in reinforced concrete would enhance their flexural toughness & rigidity and enhance their overall performances

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BEHAVIOR OF HIGH STRENGTH FIBER REINFORCED CONCRETE SQUARE COLUMNS WITH HYBRID BARS

Proceedings of International Structural Engineering and Construction ◽

10.14455/isec.res.2020.7(1).con-18 ◽

2020 ◽

Vol 7 (1) ◽

Author(s):

Saad Al-Taan ◽

Abduljalil Aldoski

Keyword(s):

Reinforced Concrete ◽

Weight Ratio ◽

High Strength ◽

Concrete Cover ◽

Fiber Reinforced Concrete ◽

Steel Fibers ◽

Test Results ◽

Fiber Reinforced ◽

High Strength Fiber ◽

And Behavior

The paper presents test results on 20 high-strength fiber reinforced concrete square columns subjected to concentric and eccentric loading. The study aim was to examine the effect of the weight of steel fibers on the strength and behavior of HSC columns under concentric and eccentric loading. All columns were longitudinally reinforced with 4 GFRP bars 6 mm diameter, and two steel bars 10 mm diameter, making the reinforcement ratio (ρg = 0.0181), and steel ties at 64 mm spacing. The studied test variables included the steel fiber weight ratio and the eccentricity. To prevent premature spalling in the concrete cover, it was discovered that it helps to add steel fibers to HSC mixtures in concrete columns. In addition, this also increases the strength of eccentrically loaded reinforced columns compared to that for concentrically loaded columns. The strength and behavior were predicted also by the proposed method. The predicted and the experimental results found to be in a good agreement.

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Effect of Expansive Admixtures on the Shrinkage and Mechanical Properties of High-Performance Fiber-Reinforced Cement Composites

The Scientific World JOURNAL ◽

10.1155/2013/418734 ◽

2013 ◽

Vol 2013 ◽

pp. 1-11 ◽

Cited By ~ 4

Author(s):

Won-Chang Choi ◽

Hyun-Do Yun

Keyword(s):

Mechanical Properties ◽

High Performance ◽

Shrinkage Strain ◽

Cement Composites ◽

Fiber Reinforced ◽

Calcium Sulfoaluminate ◽

High Performance Fiber ◽

Reinforced Cement ◽

Shrinkage Compensation ◽

Direct Tensile

High-performance fiber-reinforced cement composites (HPFRCCs) are characterized by strain-hardening and multiple cracking during the inelastic deformation process, but they also develop high shrinkage strain. This study investigates the effects of replacing Portland cement with calcium sulfoaluminate-based expansive admixtures (CSA EXAs) to compensate for the shrinkage and associated mechanical behavior of HPFRCCs. Two types of CSA EXA (CSA-K and CSA-J), each with a different chemical composition, are used in this study. Various replacement ratios (0%, 8%, 10%, 12%, and 14% by weight of cement) of CSA EXA are considered for the design of HPFRCC mixtures reinforced with 1.5% polyethylene (PE) fibers by volume. Mechanical properties, such as shrinkage compensation, compressive strength, flexural strength, and direct tensile strength, of the HPFRCC mixtures are examined. Also, crack width and development are investigated to determine the effects of the EXAs on the performance of the HPFRCC mixtures, and a performance index is used to quantify the performance of mixture. The results indicate that replacements of 10% CSA-K (Type 1) and 8% CSA-J (Type 2) considerably enhance the mechanical properties and reduce shrinkage of HPFRCCs.

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