Effects of Three Steel Fibers on the Properties of High Strength Concrete

2013 ◽  
Vol 753-755 ◽  
pp. 576-580 ◽  
Author(s):  
Hui Lian ◽  
Yun Fei Zhang ◽  
Jiang Tao Xin ◽  
Jian Hua Yang ◽  
Guo Xin Li
Keyword(s):  
High Strength Concrete ◽  
Bending Strength ◽  
Steel Fiber ◽  
Steel Wire ◽  
High Strength ◽  
Diameter Ratio ◽  
Steel Fibers ◽  
Strength Concrete ◽  
Binder Ratio ◽  
Water To Binder Ratio

Portland cement, crushed stone, sand and superplasticizer were used to obtain a high strength concrete with a low water to binder ratio. Three steel fibers such as waste steel wire, corrugated steel fiber and arch steel fiber were added into the high strength concrete. The effects of the three fibers on the slump and the strengths such as compressive strength, tensile strength and bending strength were researched. The reduction of the slump and the increasing of the strength of the concrete with the arch steel fiber were the most significant due to the highest length-diameter ratio.

scholarly journals Experimental study on spalling risk of concrete with 115~120MPa subject to ISO834 Fire

2018 ◽  
Author(s):  
Yong Du ◽  
Yu Zhu ◽  
Richard Liew
Keyword(s):  
Experimental Study ◽  
High Strength Concrete ◽  
Steel Fiber ◽  
High Strength ◽  
Steel Fibers ◽  
Vapor Compression ◽  
Mixture Ratio ◽  
Strength Concrete ◽  
High Rise ◽  
Binder Ratio

High strength concrete encased columns are being developed for erecting high-rise buildings as their higher load bearing capacity and smaller cross section size than normal concrete encased column. At ambient temperature, high strength concrete is always mixed with steel fibers to improve its ductility to match the material properties of high strength steel while constructing concrete encased columns. However, for high strength concrete at elevated temperature, spalling usually can be observed due to different thermal properties of various materials mixed such as siliceous aggregate, cement, silica fume, grit and moisture. Most of previous studies present that pore vapor compression induces high strength concrete spalling and propylene fiber can prevent it from spalling. The aim of the present experimental study is to discover the minimum propylene fiber ratio to prevent spalling of 115~120MPa concrete with aggregate and steel fiber. The experimental study carried out on 17 specimens with different water-binder ratio, steel fiber ratio and monofilament propylene fiber ratio exposed to ISO834 fire. The test results that 0.15% by volume of propylene fibers can prevent 115/120MPa high strength concrete with aggregate from spalling. It is worth noting that propylene fiber mixture ratio of 0.15% is lower than that of EN 1992-1-2 proposed up to 0.22%. Lower propylene fiber mixture ratio has been soak to improve the workability of 115~120MPa high strength concrete with steel fibers.

Effects of Two Polypropylene Fibers on the Properties of High Strength Concrete

2013 ◽  
Vol 357-360 ◽  
pp. 1328-1331
Author(s):  
Bai Rui Zhou ◽  
Dong Dong Han ◽  
Jian Hua Yang ◽  
Yi Liang Peng ◽  
Guo Xin Li
Keyword(s):  
Portland Cement ◽  
Modulus Of Elasticity ◽  
High Strength Concrete ◽  
Polypropylene Fiber ◽  
High Strength ◽  
Polypropylene Fibers ◽  
Strength Concrete ◽  
Reticular Fiber ◽  
Binder Ratio ◽  
Water To Binder Ratio

Portland cement, crushed stone, sand and superplasticizer were used to obtain a high strength concrete with a low water to binder ratio. A reticular polypropylene fiber and a single polypropylene fiber were used to improve the strength of the high strength concrete, but the effects of the two fibers on the slump and strengths were quite different. The reasons of the differences were the surface area and the modulus of elasticity of the fibers. The results show the reticular fiber was better to used in high strength concretes.

Flexural and Splitting Tensile Strength of High Strength Concrete with Diatomite Micro Particles as Mineral Additive

2020 ◽  
Vol 402 ◽  
pp. 50-55 ◽  
Author(s):  
Muttaqin Hasan ◽  
Aulia Desri Datok Riski ◽  
Taufiq Saidi ◽  
Husaini ◽  
Putroe Nadhilah Rahman
Keyword(s):  
Tensile Strength ◽  
High Strength Concrete ◽  
High Strength ◽  
Tensile Tests ◽  
Splitting Tensile Strength ◽  
Strength Concrete ◽  
Micro Particles ◽  
Mineral Additive ◽  
Binder Ratio ◽  
Water To Binder Ratio

This paper presents the flexural and splitting tensile strength of high strength concrete (HSC) with diatomite micro particles (DMP) as a mineral additive. In order to have micro particles, the diatomite from Aceh Besar District was ground and sieved with sieve size of 250 mm. The particles were then calcined at the temperature of 600 °C for 5 hours. Four mixtures were designed with different DMP to binder ratio (DMP/b). The ratio was 0%, 5%, 10% and 15%, and the water to binder ratio was 0.3. Four beam specimens with a size of 10 cm × 10 cm × 40 cm and four cylinder-specimens with 10 cm diameter and 20 cm high were prepared for each mixture. Flexural and splitting tensile tests were conducted based on ASTM C78 and ASTM C496/496M. The maximum flexural strength was reached at DMP/b of 5% while the maximum splitting tensile strength was reached at DMP/b of 0%.

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.

Experimental Research on Physical and Mechanical Properties of Steel Fiber High-Strength Concrete

2010 ◽  
Vol 168-170 ◽  
pp. 1061-1064 ◽  
Author(s):  
Yu Dong Wang ◽  
Xiao Chun Fan
Keyword(s):  
High Strength Concrete ◽  
Bending Strength ◽  
Steel Fiber ◽  
Mechanical Performance ◽  
Physical And Mechanical Properties ◽  
Drying Shrinkage ◽  
High Strength ◽  
Engineering Practice ◽  
Strength Concrete ◽  
Mix Proportion

Based on experiment, the mix proportion matching with the design and construction requirements is obtained. It meets with the requirement of pump structure on the basis of meeting the strength requirement. On this basis, the basic physical and mechanical performance is studied and the conclusion is that steel fiber high-strength concrete has excellent resistance to splitting, bending and drying shrinkage. The splitting strength and bending strength of steel fiber high-strength concrete named CF60-2 is respectively 38.7% and 56.8% higher than that of plane concrete named C60. The drying shrinkage rate of CF60-2 is 45.5% lower than that of C60 in three days. The results have an important guiding significance to steel fiber high-strength concrete in theoretical and engineering practice.

scholarly journals Vitality of Steel and Polypropylene Fibers in High Strength Concrete

2019 ◽  
Vol 8 (12) ◽  
pp. 4673-4676
Keyword(s):  
Thermal Insulation ◽  
High Strength Concrete ◽  
Steel Fiber ◽  
Gradual Increase ◽  
High Strength ◽  
Fiber Content ◽  
Steel Fibers ◽  
Polypropylene Fibers ◽  
Strength Concrete ◽  
Concrete Mix

The main aim of this work was to investigate the influence of widely used steel fibers and polypropylene fibers on the concrete. From many studies it has been shown that, addition of fibers to the concrete has influenced the cracking of concrete, due to shrinkage, thermal insulation and bleeding of water. So, in this study we made use of ultra high strength concrete mix of M50, and we made use of both steel as well as polypropylene fibers to enhance the properties of the concrete. In this study total five concrete mixes were made with steel fiber in dosages of 2.5%, 2%, 1.5%, 1% and polypropylene fibers are in dosage 0%, 0.5%, 1%, 1.5% of the weight of concrete mix. The specimens were casted and all the specimens are tested for 7days and 28 days strength. The results have depicted a gradual increase in the strength of the concrete as the fiber content increased

scholarly journals PERFORMANCE OF HIGH STRENGTH CONCRETE COLUMNS REINFORCED WITH HYBRID STEEL FIBER UNDER DIFFERENT LOADING CONDITIONS

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Emdad K.Z. Balanji ◽  
M. Neaz Sheikh ◽  
Muhammad N.S. Hadi
Keyword(s):  
High Strength Concrete ◽  
Steel Fiber ◽  
Reference Group ◽  
High Strength ◽  
Concrete Columns ◽  
Steel Fibers ◽  
Loading Conditions ◽  
Strength Concrete ◽  
High Strength Concrete Columns ◽  
Strength And Ductility

The strength and ductility of high strength concrete columns improve with the addition of steel fiber. This paper reports the behavior of circular High Strength Concrete (HSC) columns reinforced with Hybrid Steel Fibers (HSF) under different loading conditions. In this study, HSF consisted of a combination of macro steel fibers and micro steel fibers. A total of eight circular specimens of 205 mm diameter and 800 mm height were cast and tested. All specimens were reinforced with same amount of steel reinforcements. The specimens were divided into two groups of four specimens. Group RC (reference group) contained no steel fibers. Group HSF (hybrid steel fibers) contained 2.5% by volume of HSF. From each group one specimen was tested under concentric loading, one under 25 mm eccentric loading, one under 50 mm eccentric loading, and one under four-point loading. The results showed that the specimens reinforced with HSF achieved higher strength and ductility compared to RC specimens under different loading conditions. It was also observed that the presence of HSF delayed the spalling of the concrete cover.

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.

scholarly journals Influence of internal curing on the properties of non-fibrous high strength concrete—A critical review

2021 ◽  
Vol 1 (3) ◽  
pp. 1-6
Author(s):  
Ferhad Rahim Karim
Keyword(s):  
High Strength Concrete ◽  
Autogenous Shrinkage ◽  
High Strength ◽  
Internal Curing ◽  
Degree Of Hydration ◽  
Strength Concrete ◽  
Hydrated Cement Paste ◽  
Future Performance ◽  
Binder Ratio ◽  
Water To Binder Ratio

The demand for the construction of high-strength concrete in the civil engineering zone is growing, particularly in the last couple of years, due to the construction of sustainable and economic buildings with an extraordinary slim design. Concrete curing in construction is an operative manner and essential to provide that concrete structures meet future performance and durability. High-strength concrete has a low water-to-binder ratio; proper concrete curing is important to ensure its planned performance and durability. Conventionally, exterior curing applied after placing and casting concrete stays warm and moist to provide continued cement hydration. Lately, theoretically and experimentally comprehends that internal curing is an important tool to provide additional moisture in the concrete to enhance cement's hydration. Internal curing of high-strength concrete is an active technique to lessen or even remove autogenous shrinkage and effects on chemical shrinkage, dry shrinkage, etc. Most studies recently have emphasized that a reduction in high strength concrete mixtures' shrinkage is due to internal curing, and the compressive strength can increase higher in mixtures with LWA or SAP than in mixtures without this agent rising degree of hydration by providing extra water in the hydrated cement paste. However, the use of internal curing leads to improving the durability of high-strength concrete.

scholarly journals Research on the Fracture Behavior of Steel-Fiber-Reinforced High-Strength Concrete

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 135
Author(s):  
Shanming Qin ◽  
Danying Gao ◽  
Zhanqiao Wang ◽  
Haitang Zhu
Keyword(s):  
High Strength Concrete ◽  
Fracture Behavior ◽  
Steel Fiber ◽  
Volume Fraction ◽  
High Strength ◽  
Steel Fibers ◽  
Fiber Reinforced ◽  
Three Point Bending ◽  
Strength Concrete ◽  
Fracture Parameters

The behavior of steel fiber concrete, which is the most widely used building material, has been widely examined. However, methods for calculating Fracture parameters differ by fracture behavior of SFHSC with different strengths. In this study, the fracture behavior of steel-fiber-reinforced high-strength concrete (SFHSC) was -investigated using three-point bending tests. A total of 144 notched concrete beams with a size of 100 mm × 100 mm × 515 mm were tested for three-point bending in 26 groups. The effects of the steel fiber volume ratio, steel fiber type, and relative notch depth on the fracture toughness (KIC) and fracture energy (GF) of SFHSC specimens were studied. The results show that an increase in the volume fraction of steel fiber (ρf) added to high-strength concrete (HSC) significantly improves the fracture behavior of HSC. As compared to milled and sheared corrugated steel fibers, cut bow steel fibers significantly improve the fracture behavior of SFHSC. The effect of incision depth changes on the KIC and GF of SFHSC and HSC for the comparison group has no common characteristics. With an increase in incision depth, the values of KIC of the SFHSC specimens decrease slightly. The GF0.5/GF0.4 of the SFHSC specimens show a decreasing trend with an increase in ρf. According to the test results, we propose calculation models for the fracture behavior of SFHSC with different strengths. Thus, we present a convenient and accurate method to calculate fracture parameters, which lays a foundation for subsequent research.

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