Improved tensile performance with fiber reinforced self-compacting concrete (original) (raw)
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Enhancing the Strength Properties of Self-Compacting Concrete with Fiber Reinforcement
Regular Issue, 2019
Self-compacting concrete is one that is flow able by its own. The SCC is suitable for placing in dense reinforcement structures. It is a new generation performance concrete known for its outstanding deformity and high resistance to bleeding. The concrete is frail material which is comparatively tough in compression but fragile in tension. The tensile strength of concrete is improved by addition of fibers in the concrete mix. The addition of such fibers has negative consequence on the workability of concrete. Various types of fibers are used in concrete to provide the higher flexural strength and better tensile strength. In this research steel fibers are used to provide a better strength as compared with normal reinforced concrete. Steel fiber in SCC significantly improves its flexural strength, improved tensile properties, reduce cracking and improve durability. In this research the investigation of steel fiber in SCC to enhance the strength properties of SCC. The objective of the s...
The Investigation of Fiber Reinforcement Self-Compacting Concrete and Fiber Reinforcement Concrete
Journal of Civil & Environmental Engineering, 2016
Precisely, researches have been done on Fiber Reinforcement Self-Compacting Concrete (FRSCC) which can divide into two different fields, material serviceability and mechanical rheology investigations. The mechanical aspect of FRSCC has been investigated to provide the constitutive models of shear and flexure capacity, tensile or compressive zone data. The characteristics of FRC are determined by post-cracking behavior and FRSCC is controlled by SCC workability. By using FRSCC the costs and construction period reduce significantly and its ability to place irregular section in terms of congestion of stirrups and bars and thin section is another great aspect. Consequently of this capability is to arrest cracks, fibers mixtures increased tensile strength, both at ultimate and at first crack, especially under flexural loading. The other ability of fibers are to hold matrix after extensive cracking. The transition failure from brittle to ductile by fibers is another ability of fibers which can absorb energy and survive under impact loading. In this study, investigate the fibers influence by two techniques, direct and inverse technique.
Flexural behavior of self-compacting concrete reinforced with different types of steel fibers
Construction and Building Materials, 2013
Steel fiber self-compacting concrete (SFSCC) is an innovative material that can flow underneath its own weight in the fresh state, thus eliminating any need for mechanical vibration and complexity of the formwork, and which employs the benefits of steel fibre addition in the hardened state. Hence, this study evaluated the performance of a selfcompacting concrete (SCC) under the effect of filler addition and then investigated the effect of steel fiber (SF) addition on flexural behavior, splitting tensile strength, compressive strength, and modulus of elasticity. Fourteen reinforced concrete beams were tested under monotonic loads: two sets of six SCCs (with and without SFs) and two normal concretes (NCs). Ultimate capacity, deflection, crack pattern, and mode of failure were recorded. The present experimental and theoretical results were compared in accordance with ACI 318 codes to assess the applicability of the aforementioned methods to predict the flexural strength of SCC specimens. The results of the tests carried out on fresh concretes indicate excellent deformability without blocking. Moreover, the flexural strength in beams increases with increasing concrete compressive strength, longitudinal steel reinforcement ratio, and SF amount.
A STUDY ON STRENGTH CHARACTER OF SELF COMPACTING CONCRETE WITH FIBRE REINFORCED CONCRETE
A self-compacting concrete (SCC) is the one that can be placed in the form and can go through obstructions by its own weight and without the need of vibration .its first development in Japan in 1988, SCC has gained wider acceptance in Japan, Europe and USA due to its inherent distinct advantages. The major advantage of this method is that SCC technology offers the opportunity to minimize or eliminate concrete placement problems in difficult conditions. It avoids having to repeat the same kind of quality control test on concrete, which consumes both time and labor. Construction and placing becomes faster& easier. It eliminates the need for vibration & reducing the noise pollution. It improves the filling capacity of highly congested structural members. SCC provides better quality especially in the members having reinforcement congestion or decreasing the permeability and improving durability of concrete. The primary aim of this study is to explore the feasibility of using SCC by examining fresh and hardened properties by introducing glass (0.1%) and steel (1.5%) fibers of M40 Grade SCC and comparing the same with M40 Grade Plain SCC. Also, to study the fresh and hardened properties of M80 Grade SCC with varying Packing Factors i.e. 1.12,1.14,1.16,1.18 and comparing the same with M80 Grade conventional concrete When the fiber reinforcement is in the form of short discrete fibers, they act effectively as rigid inclusions in the concrete matrix. Physically, they have thus the same order of magnitude as aggregate inclusions; steel fiber reinforcement cannot therefore be regarded as a direct replacement of longitudinal reinforcement in reinforced and prestressed structural members. However, because of the inherent material properties of fiber concrete, the presence of fibers in the body of the concrete or the provision of a tensile skin of fiber concrete can be expected to improve the resistance of conventionally reinforced structural members to cracking, deflection and other serviceability conditions. Compressive strength of concrete is measured by testing standard cubes (150mm x 150mm x 150mm) at the age of 7 days, 28 days and 90 days, The tests were conducted on varying percentages of steel fibers and studied for their torsional resistance for combined loading under torsion-bending-shear.The existing literature indicates that many researchers have studied the torsional strength, torsion to moment or torsion to shear of steel fiber reinforced concrete beams. However, scanty literature is available on testing of specimen blended with steel crimped fiber and flyash subjected to combined torsion, bending and shear.Hence, by observing the existing literatures, this work is carried out with different percentages of fibers with the inclusion of admixtures to form binary blended concrete to study the behavior of specimen subjected to combined torsion, bending and shear and to achieve the optimum fiber percentage for Binary Blended Fiber Reinforced Concrete Beams.
Mechanical properties of self-compacted fiber concrete mixes
HBRC Journal, 2014
Increased productivity and improved working environment have had high priority in the development of concrete construction over the last decade. The major impact of the introduction of self-compacting concrete (SCC) is connected to the production process. The productivity is drastically improved through the elimination of vibration compaction and process reorganization. The working environment is significantly enhanced through avoidance of vibration induced damages, reduced noise and improved safety. Additionally, SCC technology has improved the performance in terms of hardened concrete properties like surface quality, strength and durability. The main objective of this research was to determine the optimum content of fibers (steel and polypropylene fibers) used in SCC. The effect of different fibers on the fresh and hardened properties was studied. An experimental investigation on the mechanical properties, including compressive strength, flexural strength and impact strength of fiber reinforced self-compacting concrete was performed. The results of the investigation showed that: the optimum dosage of steel and polypropylene fiber was 0.75% and 1.0% of the cement content, respectively. The impact performance was also improved due to the use of fibers. The control mix specimen failed suddenly in flexure and impact, the counterpart specimens contain fibers failed in a ductile manner, and failure was accompanied by several cracks.
The essentiality of self-compacting concrete can be understood from the fact that there is an increasing problem of lack of skilled labor in the construction industry. The benefit of SCC is that it provides faster construction period and allows an early development of strength for concrete. The above paper deals with flexure and flow properties of self-compacting concrete reinforced with a combination of steel with sisal and abaca fibers. Three percentages of sisal (0.5%,1%,1.5%)or three of abaca (0.5%,1%,1.5%) are mixed with a uniform 0.3% and 0.6% of steel fibers. Split tensile strength and flexure strength are evaluated at 7 days and 28 days for various specimens of self-compacting concrete made by variation of fiber provides an understanding of mechanical properties and tests like Slump flow, J –ring and U-box test are performed for an understanding of flow of self-compacting concrete
Mechanical and durability evaluation of fiber-reinforced self-compacting concrete
Construction and Building Materials, 2016
h i g h l i g h t s Effect of fiber addition on mechanical and durability characteristics of SCC was evaluated. Effect of early wetting/drying cycles on FRSCC mechanical properties was investigated. Microstructural analysis of FRSCC and correlation with macro-properties was conducted. Low chloride permeability was achieved confirming adequate durability of FRSCC.
Workability of hybrid fiber reinforced self-compacting concrete
Building and environment, 2005
Compared to fiber reinforced concrete (FRC), self-compacting concrete (SCC) is a relatively new type of concrete with high flowability and good cohesiveness. It offers very attractive economical and technical benefits, which can be further extended when combined with FRC. In this ...
Mechanical Behavior of Self-Compacting Reinforced Concrete Including Synthetics and Steel Fibers
This paper investigated the effects of combining fibers with selfconsolidating concrete (SCC). 12 series of test specimens were prepared using three kinds of fibers including steel, polyphenylene sulfide (PPS) and glass fibers with four different volumes fractions and one specimen without fibers as a reference sample. All plans were subjected to fresh concrete tests. For mechanical behavior of concrete, compressive, tensile and flexural strength, toughness, fracture energy and force-displacement curves has been studied. Fresh (rheological) properties were assessed using L-Box, Slump flow and T-50 tests. results show that concrete workability is reduced by increasing fiber volume fraction; among different fibers the PPS fibers have less negative effects on rheology. On the contrary, these fibers can improve the splitting tensile, flexural strength, toughness and fracture energy of SCC significantly; however strength of compressive is decreased by increasing the amount of fibers. Adding steel fibers to SCC increases energy absorption eminently.
Fibre-reinforced Self-Compacting Concrete: A Review
IOP Conference Series: Materials Science and Engineering, 2018
Fibre-reinforced self-compacting concrete (FRSCC) is a new building material that combines positive characteristics of workability of self-compacting concrete (SCC) with enhanced characteristics of hardened concrete due to fibre addition. In literature, metallic and synthetic fibres are used as the SCC reinforcement. From the literature it may be established that workability properties of SCC are more adversely affected by the use of metallic fibres. Also, metallic fibres are more effective than synthetic fibres in increasing the mechanical properties of SCC.