scholarly journals Influence of steam curing on properties of fiber-reinforced concrete during hardening

2018 ◽  
Vol 251 ◽  
pp. 01031
Author(s):  
Vadim Soloviev ◽  
Marsel Nurtdinov ◽  
Sergey Belikov ◽  
Evgeniy Matyushin
Keyword(s):  
Steel Fiber ◽  
Mechanical Performance ◽  
Thermal Capacity ◽  
Fiber Reinforced Concrete ◽  
Steam Curing ◽  
Curing Conditions ◽  
Production Stage ◽  
Concrete Production ◽  
Fiber Concrete ◽  
Steel Fiber Concrete

To increase the efficiency of steel-fiber concrete production, the existing technological operations that could reduce the costs should be optimized. This process requires scientific research and analysis of the existing results to improve the efficiency of each production stage. One of the important stages in the steel-fiber concrete production is steam curing, which is responsible for forming the cementitious matrix structure. To increase the efficiency of this production stage, a study was conducted to develop the steam curing conditions according to the rules of steel-fiber concrete structure formation and the methods of improving durability indicators. Tests on several steel-fiber concrete compositions were conducted, and the relations between its thermal conductivity and the reinforcement coefficient of concrete were revealed. The results of the tests let us conclude that with the increase of the reinforcement coefficient its thermal capacity decreases. The temperature gradient charts along the cross-section of samples with different cement/sand ratios and reinforcement coefficients were built. According to the data obtained, the optimal industrial conditions of steam curing were discovered. The dependences determining the increase of mechanical performance of steel-fiber concrete due to the formation of prestressed fiber structure in the material were revealed.

scholarly journals The change in impermeability of steel fiber reinforced concrete with high strength cement-sand matrix at heating

2020 ◽  
Vol 17 (1) ◽  
pp. 150-155
Author(s):  
V. A. Dorf ◽  
◽  
R. O. Krasnovskij ◽  
D. E. Kapustin ◽  
P. S. Sultygova ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Steel Fiber ◽  
Heating Temperature ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Fiber Concrete ◽  
The Matrix ◽  
Steel Fiber Concrete

The paper considers the effects of high temperatures in case of fire on the change in impermeability of steel fiber reinforced concrete having a high-strength cement-sand matrix and various content of fiber of different types, sizes, and strength. It is shown that in the temperature range from 20° to 1100° C in the diagram “Heating temperature - impermeability class», the matrix and steel fiber concrete(SFC) have a S-shaped character, and in case of heating temperature of over 100 °C, there comes a distinct decrease in impermeability.

The Design Application of Steel Fiber Concrete on Bottom Frame Structure

2013 ◽  
Vol 639-640 ◽  
pp. 1241-1244
Author(s):  
Jun Zuo
Keyword(s):  
Reinforced Concrete ◽  
Steel Fiber ◽  
Internal Force ◽  
Fiber Reinforced Concrete ◽  
Frame Structure ◽  
Steel Fiber Reinforced Concrete ◽  
Concrete Frame ◽  
Fiber Concrete ◽  
Steel Fiber Concrete ◽  
Bottom Frame

The concrete frame with bottom frame structure bear the load from the upper floors, roofing and brick walls, internal force is quite large, so the designed section size of frame beams is big, sometimes even the clear height of the building can't meet the architectural requirements; And more reinforcement, construction of concrete are difficult to pound, even vibration bar are difficult to insert into the beam, seriously influence the construction quality of reinforced concrete and the frame structure quality can't t be assured. This article introduces the design and application of steel fiber reinforced concrete in the bottom frame through the practical engineering examples. Steel fiber concrete can enhance the tensile and shear strength, and make it has good resistance to crack and toughness. As a result of the steel fiber concrete, the bearing capacity of bottom frame is greatly improved, and the problem in the project is solved.

scholarly journals LABORATORY TESTING OF STEEL FIBER CONCRETE PRISM FOR TENSION IN BENDING

2020 ◽  
pp. 105-113
Author(s):  
M.G. Surianinov ◽  
◽  
S.P. Neutov ◽  
I.B. Korneeva ◽  
I.K. Kalchev ◽  
...  
Keyword(s):  
Crack Resistance ◽  
Bearing Capacity ◽  
Steel Fiber ◽  
Fiber Reinforcement ◽  
Fiber Reinforced Concrete ◽  
Steel Fiber Reinforced Concrete ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Fiber Concrete ◽  
Steel Fiber Concrete

Abstract. Laboratory bending tests of concrete and steel-fiber-concrete prisms were carried out. The concrete matrix for all prisms is made of a concrete mixture of the same composition with a coarse aggregate size up to 10 mm and a water-cement ratio that allows correct mixing of the ready mixture with fiber, so that the latter is evenly distributed over the sample volume. Fiber reinforcement is 1% for all three types of fiber, a fiber made of the same steel with an ultimate strength of 1335 MPa, fiber length 50 mm, diameter 1 mm is used. Fibers differ only in shape, which makes it possible to compare test results across series without correction factors. Concrete samples without fiber are considered as control samples. As a result of laboratory tests, data sets were obtained and analyzed, which are presented in the form of diagrams. Different types of steel fiber show different increases in the load at the beginning of cracking and load-bearing capacity. The most profitable from this point of view is the addition of anchor fiber to concrete, the least – wave fiber. However, the presence of any of the considered steel fibers in the mixture significantly increases the load-bearing capacity of the sample. In addition, the type of destruction of such a sample changes from brittle to viscous. We also studied the deformability of samples with different fiber reinforcement and plotted the dependence of the relative longitudinal strain on the load. Before the crack formation begins, there is a direct proportionality between the load and the strain with the appearance of cracks, the slope of the graphs changes sharply. When the load-bearing capacity is lost, steel fiber-reinforced concrete samples are restrained from final destruction. The use of steel fiber in concrete on average increases the crack resistance by 40%, and the load-bearing capacity by 64%. Compared with samples without fiber reinforcement, samples with anchor fiber show an increase in load-bearing capacity by 89%, and crack resistance by 61%. When using flattened fiber, these values are 56% and 32%, and for wave fiber – 47% and 25%, respectively. The use of steel fiber in the manufacture of concrete mix avoids the brittle nature of destruction.

scholarly journals Research status and prospect of waste steel fiber reinforced concrete

2021 ◽  
Vol 248 ◽  
pp. 03039
Author(s):  
Yu Binglin
Keyword(s):  
Reinforced Concrete ◽  
Steel Fiber ◽  
Fiber Reinforced Concrete ◽  
Synthetic Fiber ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Scrap Tire ◽  
Research Status ◽  
Fiber Concrete ◽  
Steel Fiber Concrete

Scrap steel fiber concrete (SFRC) is a new kind of concrete material, which uses the scrap steel fiber from the scrap tire as the reinforced fiber of FRP bar fiber reinforced concrete, replacing or partially replacing the traditional steel fiber and synthetic fiber. This paper summarizes the research status of waste steel fiber at home and abroad, including the mechanical properties of compressive and tensile resistance, the mixing amount and use requirements of waste steel fiber, and finally the development prospect of waste steel fiber concrete is forecasted

Static Fatigue Experimental Research on Orthotropic Deck with Composite Pavement Layer

2013 ◽  
Vol 275-277 ◽  
pp. 1011-1015
Author(s):  
De Rong Zhu ◽  
Zi Jiang Yang ◽  
Hui Zhang ◽  
Shi Zhong Liu ◽  
Gui Xia Ning
Keyword(s):  
Asphalt Concrete ◽  
Steel Fiber ◽  
Mechanical Performance ◽  
Fatigue Loading ◽  
Static Fatigue ◽  
Concrete Layer ◽  
Fiber Concrete ◽  
Steel Fiber Concrete ◽  
Loading Tests ◽  
Better Than

The experimental results show that the deck of the bridge displays obviously orthotropic features; shear nails with reasonable density can increase the binding capability of each part of deck pavement and overall mechanical performance. The results of fatigue test on the two groups of specimen indicate that the composite deck pavement added with the shear nails and the transition layer of steel fiber concrete has no sign of fatigue failure after 8.3 million fatigue loading tests, and its fatigue resisting property is obviously better than the deck pavement where the asphalt concrete is directly paved on the surface of deck, that is to say the service life of the deck pavement can be extended by the use of steel fiber concrete layer.

Experimental Studies of Reinforced Concrete and Fiber-Reinforced Concrete Beams with Short-Term and Long-Term Loads

2019 ◽  
Vol 968 ◽  
pp. 227-233 ◽  
Author(s):  
Stepan Neutov ◽  
Maryna Sydorchuk ◽  
Mykola Surianinov
Keyword(s):  
Reinforced Concrete ◽  
Steel Fiber ◽  
Concrete Beams ◽  
Experimental Studies ◽  
Fiber Reinforced Concrete ◽  
Reinforced Concrete Beams ◽  
Short Term ◽  
Ordinary Concrete ◽  
Fiber Concrete ◽  
Steel Fiber Concrete

Experimental studies of the stress-strain state of reinforced concrete and fiber-reinforced concrete beams under short-term and long-term loads were carried out. The tests were carried out on three series of beams of different types - from ordinary concrete, steel fiber concrete and combined section, when the lower zone of the beam with a height of0.5his made of steel fiber concrete, and the upper one is made of ordinary concrete. During short-term loading, the load was applied in steps with a 10-minute exposure at each step to failure or to a predetermined level of a continuously acting load. In the interval between the steps, the process of cracking was tracked. After reaching a given level of loading, the load was fixed and maintained unchanged with a spring cassette for 300 days. Deformations were measured using strain gauges and dial gauges. Deflections and relative deformations of the extreme upper and extreme lower fibers for three types of beams are determined. It has been established that stabilization of deflections in beams from steel fiber concrete occurs much earlier (100 days) than in beams made of ordinary concrete (175 days). Studies have shown that the beams of ordinary concrete in the process of long-acting load lowered the carrying capacity by 5.5%. The bearing capacity of steel concrete beams, in contrast, increased by 7.6%.

Study and Comparison of Characteristics of Models of Hollow-Core Slabs, Reinforced Concrete and Steel-Fiber Concrete

2020 ◽  
Vol 864 ◽  
pp. 9-18
Author(s):  
Mykola Surianinov ◽  
Stepan Neutov ◽  
Iryna Korneieva ◽  
Maryna Sydorchuk
Keyword(s):  
Reinforced Concrete ◽  
Steel Fiber ◽  
Concrete Slab ◽  
Fiber Reinforced Concrete ◽  
Hollow Core ◽  
Steel Fiber Reinforced Concrete ◽  
Reinforced Concrete Slab ◽  
Fiber Concrete ◽  
Steel Fiber Concrete ◽  
Correct Data

Two models of hollow core slabs were tested: reinforced concrete and steel fiber concrete. When designing slab models, the proportions of full-sized structures were preserved for the further possibility of correct data comparison. As a result of testing models of hollow core slabs, it was found that the bearing capacity of a slab with combined reinforcement is 24% higher than that of reinforced concrete, the deflection is 36% less, and the crack resistance is 18% higher. The use of steel fiber made it possible to avoid the brittle fracture of a steel fiber reinforced concrete slab, which was observed in the model of a conventional reinforced concrete slab.

scholarly journals The Effect of Vibration Mixing on the Mechanical Properties of Steel Fiber Concrete with Different Mix Ratios

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3669
Author(s):  
Chunyu Zhang ◽  
Yikai Sun ◽  
Jianguo Xu ◽  
Bo Wang
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Steel Fiber ◽  
Volume Ratio ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Fiber Volume ◽  
Fiber Concrete ◽  
Steel Fiber Concrete

This work addresses how vibration stirring, steel-fiber volume ratio, and matrix strength affect the mechanical properties of steel-fiber-reinforced concrete. The goal of the work is to improve the homogeneity of steel-fiber-reinforced concrete, which is done by comparing the mechanical properties of steel-fiber-reinforced concrete fabricated by ordinary stirring with that fabricated by vibration stirring. The results show that the mechanical properties of steel-fiber-reinforced concrete produced by vibration mixing are better than those produced by ordinary mixing. The general trend is that the mechanical properties of steel-fiber concrete have a linear relationship with the matrix strength and the volume ratio of steel fiber. The best mechanical properties are obtained for a steel-fiber volume ratio of less than 1%. We have also established calculation models for the mechanical performance index of vibration, mixing steel-fiber concrete based on the test results. Microscopic studies show that vibration stirring optimizes the microstructure of the transition zone between the concrete interface and the slurry, and improves the homogeneity of the steel-fiber-reinforced concrete, and enhances the adhesion between the mixture components.

Finite Element Analysis on Orthotropic Deck with Composite Pavement Layer

2013 ◽  
Vol 275-277 ◽  
pp. 1163-1166
Author(s):  
De Rong Zhu ◽  
Zi Jiang Yang ◽  
Hui Zhang ◽  
Shi Zhong Liu ◽  
Gui Xia Ning
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Optimization Design ◽  
Steel Fiber ◽  
Mechanical Performance ◽  
Element Analysis ◽  
Box Girder ◽  
Concrete Layer ◽  
Fiber Concrete ◽  
Steel Fiber Concrete

Orthotropic steel deck; Shear nail; Steel fiber concrete pavement layer; Stress analysis. Abstract. Aiming at the optimization design of composite pavement on orthotropic deck in a streamlined steel box girder with lager wide-to-span ratio, finite element analysis is taken under various loads supplemented with static model; the stress distribution is analyzed in each part of the pavement layer. The theoretical results show that the deck of the bridge displays obviously orthotropic features; shear nails with reasonable density can increase the binding capability of each part of deck pavement and overall mechanical performance. It can be concluded that the service life of the deck pavement can be extended by the use of steel fiber concrete layer.

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