scholarly journals Experimental investigation on effect of different shaped steel fibers on compressive strength of high strength concrete

2013 ◽  
Vol 6 (4) ◽  
pp. 24-26 ◽  
Author(s):  
D.B.Mohite D.B.Mohite
Keyword(s):  
Experimental Investigation ◽  
Compressive Strength ◽  
High Strength Concrete ◽  
High Strength ◽  
Steel Fibers ◽  
Strength Concrete

Compressive Strength and Splitting Tensile Strength of Steel Fiber Reinforced Ultra High Strength Concrete (SFRC)

2010 ◽  
Vol 34-35 ◽  
pp. 1441-1444 ◽  
Author(s):  
Ju Zhang ◽  
Chang Wang Yan ◽  
Jin Qing Jia
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
High Strength Concrete ◽  
Steel Fiber ◽  
Volume Fraction ◽  
High Strength ◽  
Splitting Tensile Strength ◽  
Steel Fibers ◽  
Fiber Reinforced ◽  
Strength Concrete

This paper investigates the compressive strength and splitting tensile strength of ultra high strength concrete containing steel fiber. The steel fibers were added at the volume fractions of 0%, 0.5%, 0.75%, 1.0% and 1.5%. The compressive strength of the steel fiber reinforced ultra high strength concrete (SFRC) reached a maximum at 0.75% volume fraction, being a 15.5% improvement over the UHSC. The splitting tensile strength of the SFRC improved with increasing the volume fraction, achieving 91.9% improvements at 1.5% volume fraction. Strength models were established to predict the compressive and splitting tensile strengths of the SFRC. The models give predictions matching the measurements. Conclusions can be drawn that the marked brittleness with low tensile strength and strain capacities of ultra high strength concrete (UHSC) can be overcome by the addition of steel fibers.

scholarly journals Effect of Steel Fiber Aspect Ratio on the Properties of High Strength Self Compacting Concrete

2019 ◽  
Vol 9 (2) ◽  
pp. 2938-2941
Keyword(s):  
Compressive Strength ◽  
High Strength Concrete ◽  
High Strength ◽  
Steel Fibers ◽  
Self Compacting Concrete ◽  
Split Tensile Strength ◽  
Strength Concrete ◽  
Fiber Aspect Ratio ◽  
Aspect Ratios ◽  
Hardened Properties

The High strength concrete defined as per IS 456 as the concrete having characteristic compressive strength more than 65 MPa. The self-compacting concrete has lot of advantages including concreting at congested reinforcement locations, better finish, good compaction etc. The inclusion of fibers in the concrete mix decreases the brittle nature of concrete thereby the ductility increases. Different types of fibers are available for inclusion in concrete like steel, glass, polypropylene, basalt, etc. In the present investigation, high strength concrete having characteristic strength of 90 MPa was developed and hooked ended steel fibers are used and the hardened properties are determined. Steel fibers having diameter of 1 mm and lengths of 25 and 50 mm were added to concrete in 0.125%, 0.25% and 0.5% by volume of concrete. Three hardened properties compressive strength, split tensile Strength and flexural strength were determined. Out of the two lengths of fiber i.e with two aspect ratios, the fiber with 50 mm length yielded better results.

High Strength Concrete Orthogonal Test of Employing Twin Admixture Technique of Grade II Fly Ash and S95 GGBS

2013 ◽  
Vol 357-360 ◽  
pp. 1455-1458
Author(s):  
Xiang Jun Dong ◽  
Xin Liu ◽  
Rui Jiang
Keyword(s):  
Experimental Investigation ◽  
Compressive Strength ◽  
Fly Ash ◽  
High Strength Concrete ◽  
Coal Ash ◽  
High Strength ◽  
Orthogonal Test ◽  
Reducing Agent ◽  
Strength Concrete ◽  
Grade Ii

This paper focuses on experimental investigation to produce high strength concrete by employing twin admixture technique of grade II fly ash and S95 GGBS. Different regions have different characteristic of the material, so the strength of high strength concrete would be influenced. At present most of the domestic studies about high strength concrete use the first class powered coal ash and rarely grade II fly. In this study, grade II fly ash is chosen. The dosage of grade II fly ash, S95 GGBS and the water reducing agent are given as the influencing factors of high-strength concretes compressive strength and collapsed slump, and determined the optimum mix amount of the components. The data of strength about the age of 3 day, 7 day and 28 day are analyzed. The results are showed the optimum content of grade II fly ash is between 15% and 20%, S95 GGBS is 15% and water reducing agent is 2%.

Study of Properties of High Strength Concrete Reinforced with Industrial Waste Steel Fibers

2011 ◽  
Vol 341-342 ◽  
pp. 231-241
Author(s):  
Hosein Rahnema ◽  
Mohammad Hosein Modarresi ◽  
Ali Lashkari ◽  
Mohammad Ali Hadianfard ◽  
Saeid Sedaghat
Keyword(s):  
Compressive Strength ◽  
High Strength Concrete ◽  
Industrial Waste ◽  
Bending Strength ◽  
Fresh Concrete ◽  
High Strength ◽  
Steel Fibers ◽  
The Other ◽  
Test Results ◽  
Strength Concrete

High strength concrete (HSC) farther than high compressive strength, possesses uniform high density and very low impermeability, endowing itself with excellent resistance to aggressive environments and disintegrating agencies. But HSC has low flextural strength. Studies have shown that the lack of enough flextural strength of high strength concrete can be compensated by adding steel fibers to the concrete mixture. On the other hand one of the most important environmental problems is the majority of waste spiral steel chips, collected in industrial poles. In this study waste spiral steel chips have been used as steel fibers to reinforced high strength concrete. Also the properties of mixture have been studied. The main properties in this study are including slump of fresh concrete, density, compressive and bending strength of 28-days old specimens. The chips are classified into three different groups according to their shapes and three different categories of test are performed according to percentage of fibers in the mixture. The test results show that any increase in percentage of fibers, will increase the density of specimens and will decreases the slump of mixtures but it will result different behavior of their compressive and bending strength.

Bond Strength Of Deformed Bars and Steel Fibers in High Strength Concrete

1987 ◽  
Vol 114 ◽  
Author(s):  
Methi Wecluat ◽  
Schboon Chimamphant
Keyword(s):  
Compressive Strength ◽  
Bond Strength ◽  
High Strength Concrete ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Fiber Reinforced ◽  
Strength Concrete ◽  
Pull Out ◽  
Deformed Bar

ABSTRACTIn recent years, the means of making high strength concrete are simple by adding microsilica, fly ash, or other types of additives. As the use of high strength concrete increases, the need to clearly understand its prcperties is essentially a necessity for engineering design. While much of the basic properties of high strength concrete such as compressive strength (fc), modulus of elasticity (Ec), and modulus of rupture (fr), etc., has been investigated and reported recently, many remain unavailable. This paper presents the bond strength characteristics of deformed bar, steel fibers, and normal aggregate in high strength concrete matrix. The compressive strength of concrete used in this study is 75–80 MPa (11,000-12,000 psi). Bond slip relationships of deformed bars of three different bar diameters were obtained from the pull-cut test. Two types of steel fiber reinforced high strength cemented composites were tested in a directtension, tapered specimen to observe the pulled-out behavior of steel fibers. Fiber reinforced concretes with fiber volume fraction of 0.5, 1.0, 1.5, and 2.0 % were compared to the unreinforced matrix. A direct-tension, dog boned specimen was used to study the bond between aggregate-matrix interface. The results from this study indicate that high strength concrete is generally more brittle, and in essence, allows less microcracking, less slippage, and less pulled-out deformation. This general trend is observed in both the deformed bar and fiber pulled-out as well as in aggregate-matrix interfacial debonding. The maximum slip of deformed bars in high strength concrete is about 0.15 mm.(0.006 in.) which is only one-tenth of that reported for normal concrete as 1.5 to 2.0 mm.(0.06–0.08 in.). A normalized pull-out stress-displacement relationship of high strength fiber reinforced concrete exhibits a unique behavior similar to those reported for normal fiber reinforced matrix.

Development of Mechanical Properties of Steel Fibers Reinforced High Strength Concrete

2014 ◽  
Vol 1077 ◽  
pp. 113-117 ◽  
Author(s):  
Filip Vogel ◽  
Ondřej Holčapek ◽  
Marcel Jogl ◽  
Karel Kolář ◽  
Petr Konvalinka
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Bulk Density ◽  
High Strength Concrete ◽  
High Strength ◽  
Time Development ◽  
Steel Fibers ◽  
Strength Concrete ◽  
Strength In Bending

This article deals with time development of basic mechanical properties of steel fibers reinforced high strength concrete (FRHSC). The basic mechanical properties were studied at different age of the fiber reinforced high strength concrete, exactly at the age 12, 15, 18 and 21 hours and 1, 2, 3, 7, 14, 21 and 28 days. The compressive strength was determined by using cubic specimens (100 x 100 x 100 mm). The tensile strength in bending and fragment compressive strength after bending were determined by prismatic specimens (40 x 40 x 160 mm). Bulk density were determined too. The comparison of mechanical properties of fibers reinforced high strength concrete and high strength concrete is in conclusion of this article.

Experimental investigation of compressive strength for fly ash on high strength concrete C-55 grade

2021 ◽  
Author(s):  
Temesgen Fantu ◽  
Getasew Alemayehu ◽  
Getachew Kebede ◽  
Yeshi Abebe ◽  
Senthil Kumaran Selvaraj ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Compressive Strength ◽  
Fly Ash ◽  
High Strength Concrete ◽  
High Strength ◽  
Strength Concrete

Effects of Nano-CaCO3 on the Compressive Strength and Microstructure of High Strength Concrete in Different Curing Temperature

2011 ◽  
Vol 121-126 ◽  
pp. 126-131 ◽  
Author(s):  
Qing Lei Xu ◽  
Tao Meng ◽  
Miao Zhou Huang
Keyword(s):  
Compressive Strength ◽  
Low Temperature ◽  
High Strength Concrete ◽  
High Strength ◽  
Curing Temperature ◽  
Test Results ◽  
Strength Concrete ◽  
Calcium Nitrite ◽  
Orientation Index ◽  
Early Strength

In this paper, effects of nano-CaCO3 on compressive strength and Microstructure of high strength concrete in standard curing temperature(21±1°C) and low curing temperature(6.5±1°C) was studied. In order to improve the early strength of the concrete in low temperature, the early strength agent calcium nitrite was added into. Test results indicated that 0.5% dosage of nano-CaCO3 could inhibit the effect of calcium nitrite as early strength agent, but 1% and 2% dosage of nano-CaCO3 could improve the strength of the concrete by 13% and 18% in standard curing temperature and by 17% and 14% in low curing temperature at the age of 3days. According to the XRD spectrum, with the dosage up to 1% to 2%, nano-CaCO3 can change the orientation index significantly, leading to the improvement of strength of concrete both in standard curing temperature and low curing temperature.

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