Assessment of High-Performance Fiber Reinforced Concrete (HPFRC) Durability Due to Exposing to Different Environmental Media (original) (raw)
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Journal of Testing and Evaluation, 1999
There are many test methods to measure the impact resistance of fiber-reinforced concrete that are complicated, time consuming, and expensive. A practical test method has been developed to measure the impact resistance of high-strength fiber-reinforced concrete (HSFRC). The equipment developed can also be used for testing aggregate impact values by simply changing the base plate of the machine. A machine was developed to measure the surface abrasion resistance of HSFRC. Testing fiber-reinforced concrete for surface abrasion resistance was found to be extremely difficult if realistic and practical results were desired. In this study the influence of silica fume on the properties of HSFRC was investigated by using silica fume at two different percentages and with three different hooked-end fibers, namely, 30/0.50, 60/0.80, and 50/0.60 length/diameter (mm/mm). Fibers were added to concrete in three different percentages of 0.5, 1.0, and 2.0% by volume of concrete. The results show that including fibers in high-strength concrete improves impact resistance, surface abrasion, and splitting tensile strength.
Effect of Fibers on Durability of Concrete: A Practical Review
Materials, 2020
This article reviews the literature related to the performance of fiber reinforced concrete (FRC) in the context of the durability of concrete infrastructures. The durability of a concrete infrastructure is defined by its ability to sustain reliable levels of serviceability and structural integrity in environmental exposure which may be harsh without any major need for repair intervention throughout the design service life. Conventional concrete has relatively low tensile capacity and ductility, and thus is susceptible to cracking. Cracks are considered to be pathways for gases, liquids, and deleterious solutes entering the concrete, which lead to the early onset of deterioration processes in the concrete or reinforcing steel. Chloride aqueous solution may reach the embedded steel quickly after cracked regions are exposed to de-icing salt or spray in coastal regions, which de-passivates the protective film, whereby corrosion initiation occurs decades earlier than when chlorides woul...
Mechanical and Durability Properties of Steel Fiber Reinforced Concrete using Silica Fume
2021
In this study steel fiber reinforced concrete incorporating silica fume has been investigated, crimped steel fiber is used by volume of 1%, 1.5%, 2%, and 2.5%, silica fume content is 5% and 10% as partial replacement of cement. For better workability high range superplasticizer is used to reduce the amount of water and maintained workability. Moreover, mechanical and durability properties of SFRC are investigated, the compressive strength of steel fiber reinforced concrete is increased with increasing in content of silica fume and steel fiber at 7, 28, and 56 days. Highest result of compressive strength is achieved in the mixes with content of 2.5% of steel fiber and 10% of silica fume. The split tensile strength is conducted for all the mixes, steel fiber has significant result against peck loads, split tensile strength has significant results in all the mixes. Flexural strength of SFRC concrete has improved with content of steel fiber, increased in volume of steel fiber has increa...
The long-term compressive strength and durability properties of concrete specimens produced by incorporating polypropylene fibers and silica fume were investigated. Silica fume, a cement replacement, was used at 8% (by weight of cement) and the volume fractions of the polypropylene fibers were 0%, 0.2%, 0.3% and 0.5%. Water-binder ratios were 0.46 and 0.36. The results indicate that the inclusion of fiber and particularly silica fume into the specimens led to an increased long-term compressive strength. Electrical resistance of the silica fume specimens improved remarkably, but decreased slightly due to the fiber inclusion. Water absorption of the fiber–silica fume specimens decreased exclusively compared to the reference samples. Inclusion of fiber and silica fume into the specimens had no considerable effect on the dynamic frequency results.
This study investigates the effect of the addition of steel and polypropylene fibers on the mechanical and some durability properties of high-strength concrete (HSC). Hooked-end steel fibers with a 60-mm length were used at four different fiber volume fractions of 0.25%, 0.50%, 0.75%, and 1.0%. Polypropylene fibers with a 12-mm length were used at the content of 0.15%, 0.30%, and 0.45%. Some mixtures were produced with the combination of steel and polypropylene fibers at a total fiber volume fraction of 1.0% by volume of concrete, in order to study the effect of fiber hybridization. All the fiber-reinforced concretes contained 10% silica fume as a cement replacement. The compressive strength, splitting tensile strength, flexural strength, electrical resistivity, and water absorption of the concrete mixes were examined. Results of the experimental study indicate that addition of silica fume improves both mechanical and durability properties of plain concrete. The results also indicate that incorporation of steel and polypropylene fibers improved the mechanical properties of HSC at each volume fraction considered in this study. Furthermore, it was observed that the addition of 1% steel fiber significantly enhanced the splitting tensile strength and flexural strength of concrete. Among different combinations of steel and polypropylene fibers investigated, the best performance was attained by a mixture that contained 0.85% steel and 0.15% polypropylene fiber. Finally, the results show that introducing fibers to concrete resulted in a decrease in water absorption and, depending on the type of fibers, significant or slight reduction in the electrical resistivity of concrete compared to those of the companion plain concrete.
Durability, physical and mechanical properties of fiber-reinforced concretes at low-volume fraction
Construction and Building Materials, 2014
Steel, polypropylene, and glass fiber concretes at low-volume fractions, which have been successfully used for crack control in many structural applications, were tested for different properties including water absorption, electrical resistivity, sorptivity, depth of chloride penetration, chloride profiles, rebar corrosion half-cell potential, and corrosion current density. Compressive strength and splitting tensile strength, flexural strength, and fracture toughness were also determined. Two different water-cement ratios and two curing types were used in the study. Fibers caused physical changes in concrete, which were reflected to the tested properties. The effect on durability was more significant in longer-term tests like corrosion. Moist curing was found to be more effective in fiber concrete for mechanical properties.
A Study on Mechanical and Durability Aspects of Concrete Modified with Steel Fibers (SFs)
Civil Engineering and Architecture, 2020
Concrete is weak in tension and strong in compression which results in brittle failure. This is obviously unacceptable for any construction materials. Thus, concrete requires some type of tensile reinforcement to balance its brittle behavior and improves its tensile strength. Adding of fibers is one of the most prevalent techniques to enhance the tensile behavior of concrete. Fiber slows cracking phenomena and increases energy absorption capacity of the structure. Majority researchers focus on mechanical performance of fiber reinforced concrete. In this research, the influence of various dosages of steel fibers (0%, 1.0%, 2.0%, 3.0%, and 4.0% by weight of cement) is investigated on the mechanical and durability properties of concrete. Mechanical properties such as compressive strength and split tensile strength are studied at 7-and 28-days curing. To evaluate the durability aspects of each mix, various parameters such as water absorption, acid attack resistance, and permeability are investigated. Results indicate that strength was increased up to 2% addition of steel fiber and then reduced gradually. It also indicates that, durability parameter of concrete for example water absorption, permeability, and acid attack resistance considerably improved with incorporation of steel fibers at 2.0% incorporation of steel fibers. Therefore, it is recommended to mix steel fibers up 2.0% by weight of cement to achieved maximum benefits.
The Cement mainly consumes approximately 10-15 % of total industrial energy. This energy releases carbon dioxide co 2 emission to atmosphere as a result of burning fuels to produce energy needed for cement manufacturing process. The study project deals with the mechanical properties of concrete specimens as per mix design. The compressive strength, split tensile strength of concrete are calculated for 7, 14 and 28 days age with replacement of chemical admixtures with respect to the cement by weight. The project deals with different percentages of replacement of silica fumes so as 0, 5, 10 and 15 and polypropylene fibers of 0, 0.4, 0.8, 1 and 1.2. Comparison of results and discussion parameters of project and pros and cons of the experiment are determined. It states the safety usage and limitations of use of chemical admixtures up to an extent. Polypropylene fibers can increases the strength of a building by reducing internal cracking in beams and column sections. it is important to reduce the crack width and this can be achieved by adding polypropylene fibers to concrete. The bridging of cracks by the addition of polypropylene fibers to other materials.Fibre reinforced concrete is a concrete containing the fiberous material which can increases its structural integrity. In this project using fiber materials is initiated to control cracks. There are different types of structures where the concrete is the only solution. The project deals with designing the M40 grade concrete by replacing and addition of some admixtures like silica fumes and polypropylene fiber. My project specifies the strength characteristics and the maintenance of lifelong strength of concrete. The project explains how to overcome the problems of cracking in concrete and maintain stability for a lifetime period and not to harm the environment with a non-degradable waste from the industries. In future research the increase in polypropylene fibre content can increases the compressive strength results upto a maximum of 2 to 3 % addition in concrete. Polypropylene fiber reinforced concrete can increases strength for columns and slabs and controls the emission of waste gases entering into the buildings.
International Journal on Advanced Science, Engineering and Information Technology, 2020
Disaster mitigation in the world of civil engineering can do by improving the performance of construction materials using High-Performance Fiber-Reinforced Concrete (HPFRC). The increasing performance of concrete materials positively affects the physical and mechanical properties of the concrete produced, including the modulus of elasticity. Many equations develop to calculate the distribution of stress-strain of concrete material, such as the Madrid Parabola Formula, Desay & Khrisnan Formula, Majewski Formula, Wang & Hsu Formula, and Saenz Formula. The purpose of this study is to investigate a stress-strain distribution equation and the elastic modulus of elasticity of HPFRC using Portland Pozzolana Cement (PPC) with variations in the composition of silica fume and steel fiber and also investigate the formula of the HPFRC stress-strain distribution. The study conduct using φ φ φ φ 15 cm x 30 cm cylindrical specimens. The materials are PPC, sand, gravel, water, silica fume additives, superplasticizers, and Dramix @ 3D steel fiber. Silica fume used varies from 0.0% to 15.0% of the weight of cement. While the steel fiber varies from 0.2% to 1.4% of the volume of the concrete mixture. The compressive strength test carries out refers to ASTM C39/C39M-03, 2003. The stress-strain relationship of HPFRC is obtained from the axial deformation measurement using an extensometer. The results of the study compare with some well-known stress-strain relationship equation. From this study, the stress-strain relationship formula of Desay-Khrisnan is rather suitable for the concrete with W/B ratio variation, but not suitable for silica fume and steel fiber content variation.