scholarly journals Compressive Strength and Elastic Modulus of Slurry Infiltrated Fiber Concrete (SIFCON) at High Temperature

2020 ◽  
Vol 6 (2) ◽  
pp. 265-275 ◽  
Author(s):  
Ali Mudhafar Hashim ◽  
Mohammed Mansour Kadhum
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
High Temperatures ◽  
Fiber Reinforced Concrete ◽  
High Fiber ◽  
Fiber Concrete ◽  
Before And After ◽  
Temperature Ranges ◽  
Fire Flame ◽  
Increasing Temperature

SIFCON is a special type of fiber reinforced concrete (FRC) with an unattached fiber matrix that gives the composite matrix important tensile properties and, due to its high fiber content, SIFCON also has distinctive and unique ductility and energy absorption properties. Higher temperature resistance is one of the most important parameters affecting the durability and service life of the material. In this research, the compression strength and elastic modulus of Slurry Infiltrated Fiber Concrete (SIFCON) were tested both before and after exposure to high temperatures. Two fire exposure durations of 2 and 3 hours are examined. In addition to room temperatures, three temperature ranges of 400 ° C, 600 ° C and 900 ° C have been introduced. The results of the experiment showed that the compressive strength and elastic modulus decreased after exposure to high temperatures. The drastically reduction of compressive strength took place with increasing temperature above 600 °C. While, the reduction in elastic modulus values is more significant than the decrease in compressive strength at the same fire flame temperatures. The residual compressive strength and elastic modulus at 900 °C were in the range of (52.1% to 59.6%) and (30.6% to 34.1%) respectively.

scholarly journals Characteristics of PVC Coated Welded Wire Mesh Fiber Reinforced Concrete

2019 ◽  
Vol 21 (1) ◽  
pp. 50-56
Author(s):  
Indradi Wijatmiko ◽  
Ari Wibowo ◽  
Christin Remayanti Nainggolan
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Fiber Reinforced Concrete ◽  
Wire Mesh ◽  
Fibrous Materials ◽  
Strength Tests ◽  
Fiber Concrete ◽  
Strain Stress ◽  
Mesh Fiber

Fiber concrete containing fibrous materials is manufactured to improve the low tensile strength of concrete and its brittle properties. In this research, fiber obtained from PVC coated welded wire mesh with diameter of 1 mm was utilized. There were several variations of fiber concrete samples made. Samples were subjected to tensile and compressive strength tests. The elastic modulus was measured by using extensometer and strain-stress gauges. The results show that the incorporation of PVC coated welded wire mesh increases the tensile strength of concrete, when the percentage of the fiber is 1.5%, with the length of 3.6cm, and the interlocking of 1.2cm. However, the compressive strength is slightly reduced from the normal ones. The elastic modulus results show that the introduction of PVC coated welded wire mesh tends to reduce the flexibility, as the value reduced 15-50% as compared to the normal ones without any fiber

scholarly journals Uniaxial Dynamic Mechanical Properties Of Tunnel Lining Concrete Under Moderate-Low Strain Rate After High Temperature

2015 ◽  
Vol 61 (2) ◽  
pp. 35-52 ◽  
Author(s):  
L. X. Xiong
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Strain Rate ◽  
High Temperatures ◽  
Concrete Specimen ◽  
Tunnel Lining ◽  
Strain Rates ◽  
Peak Strain ◽  
Increasing Temperature

AbstractTo investigate the mechanical properties of tunnel lining concrete under different moderate-low strain rates after high temperatures, uniaxial compression tests in association with ultrasonic tests were performed. Test results show that the ultrasonic wave velocity and mass loss of concrete specimen begin to sharply drop after high temperatures of 600 °C and 400 °C, respectively, at the strain rates of 10-5s-1 to 10-2s-1. The compressive strength and elastic modulus of specimen increase with increasing strain rate after the same temperature, but it is difficult to obtain an evident change law of peak strain with increasing strain rate. The compressive strength of concrete specimen decreases first, and then increases, but decreases again in the temperatures ranging from room temperature to 800 °C at the strain rates of 10-5s-1 to 10-2s-1. It can be observed that the strain-rate sensitivity of compressive strength of specimen increases with increasing temperature. In addition, the peak strain also increases but the elastic modulus decreases substantially with increasing temperature under the same strain rate.

Mechanical Properties of Polypropylene Fiber Concrete after High Temperature

2014 ◽  
Vol 662 ◽  
pp. 24-28 ◽  
Author(s):  
Xi Du ◽  
You Liang Chen ◽  
Yu Chen Li ◽  
Da Xiang Nie ◽  
Ji Huang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Reinforced Concrete ◽  
Polypropylene Fiber ◽  
Plain Concrete ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Fiber Concrete ◽  
Compressive Strength Of Concrete ◽  
Polypropylene Fiber Reinforced Concrete

With cooling tests on polypropylene fiber reinforced concrete and plain concrete that were initially subjected to different heating temperatures, the change of mechanical properties including mass loss, uniaxial compressive strength and microstructure were analyzed. The results show that the compressive strength of concrete tend to decrease with an increase in temperature. After experiencing high temperatures, the internal fibers of the polypropylene fiber reinforced concrete melted and left a large number of voids in it, thereby deteriorating the mechanical properties of concrete.

Research on the Basic Mechanical Properties of Fly Ash Fiber Reinforced Concrete

2011 ◽  
Vol 261-263 ◽  
pp. 8-12
Author(s):  
Shu Shan Li ◽  
Ming Xiao Jia ◽  
Dan Ying Gao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Fly Ash ◽  
Compressive Modulus ◽  
Fiber Reinforced Concrete ◽  
Cement Ratio ◽  
Influence Mechanism ◽  
Fiber Concrete ◽  
Early Strength

The basic mechanical properties of fly ash fiber concrete were tested. The influences to the compressive strength, splitting tensile strength and compressive modulus of elasticity of fiber concrete by water-cement ratio, dosage of fly ash and other factors were analyzed. The influence mechanism of fly ash to concrete is discussed. The results indicate that with the increase of the dosage of fly ash, the early strength of double-doped concrete is reduced, while the later strength of concrete was obviously increased.

The Equal Projection Model and Application of Short Fiber Reinforced Concrete

2012 ◽  
Vol 594-597 ◽  
pp. 959-962
Author(s):  
Yan Ru Li ◽  
Hai Bo Jiang ◽  
Ze Bao Kan
Keyword(s):  
Elastic Modulus ◽  
Reinforced Concrete ◽  
Three Dimensional ◽  
Vertical Direction ◽  
Short Fiber ◽  
Fiber Reinforced Concrete ◽  
Fiber Direction ◽  
Fiber Reinforced ◽  
Projection Model ◽  
Fiber Concrete

In order to determine the fiber direction distribution statistical characteristic of short fiber reinforced concrete, this paper put forward the equal projection model. According to the isotropic assumption of large volume of short-fiber reinforced concrete, in the three-dimensional coordinate system, when the concrete loads along all coordinate axes are equal, it is believed that a representative short fiber projection components in all axes are equal. According to the deduction, the cosine of the angle of the representative fiber and the force direction is equal to the reciprocal value of the square root of 3. On this basis, as an application example, the formula for the prediction of fiber reinforced concrete elastic modulus was deduced. The formula shows that the elastic modulus of short fiber reinforced concrete is equal to the sum of 1/3 of the elastic modulus of long fiber concrete in fiber length direction and 2/3 of the elastic modulus of long fiber concrete in the vertical direction.

Effect of Fiber on Mechanical Properties and Fire Resistance of C100 Ultra High Strength Concrete

2014 ◽  
Vol 629-630 ◽  
pp. 245-251
Author(s):  
Liang Huo ◽  
Xi Qiang Lin ◽  
Guo You Li ◽  
Tao Zhang
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Reinforced Concrete ◽  
Fire Resistance ◽  
Elevated Temperatures ◽  
Steel Fiber ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Fiber Concrete

It used conventional techniques and materials prepared high strength fiber reinforced concrete whose strength class is above C100 and it studied the effect of fiber content on the mechanical properties and elastic modulus. It also studied the fire resistance of fiber reinforced concrete. Results suggest that the strength of 28d concrete is above 100MPa and the highest strength is 126.4MPa. Under the same ratio conditions, the greater the volume content of steel fiber concrete flexural strength, the splitting tensile strength is higher. The steel fiber volume only affect elastic modulus of concrete little. When it heats to 300 °C, the no fiber concrete comminuted burst while the fiber concrete does not damaged at elevated temperatures up to 300 °C and continue to heat up, the crushing damage occurs at about 460 °C. Has not been damaged concrete specimens at 300 °C, the quality have emerged about 3% decline, while the compressive strength increased by 35%-52%, the highest strength reached 180.3MPa.

Thermal properties of jute fiber concrete at high temperature

2016 ◽  
Vol 7 (3) ◽  
pp. 182-192 ◽  
Author(s):  
Mitsuo Ozawa ◽  
Gyu-Yong Kim ◽  
Gyeong-Choel Choe ◽  
Min-Ho Yoon ◽  
Ryoichi Sato ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
High Temperatures ◽  
High Performance Concrete ◽  
Synthetic Fiber ◽  
Jute Fiber ◽  
Explosive Spalling ◽  
Content Type ◽  
Fiber Addition

Purpose The behavior of high-performance concrete (HPC) at high temperatures is very complex and also affects the global behavior of heated HPC-based structures. Researchers have also reported how various types of fibers affected the mechanical properties of cement-based materials at high temperatures. This study aims to discuss the effects of high temperatures on the compressive strength and elastic modulus of HPC with polypropylene (PP) and jute fiber. Design/methodology/approach Adding synthetic fiber (especially the PP type) to HPC is a widely used and effective method of preventing explosive spalling. Although researchers have experimentally determined the permeability of heated PP-fiber-reinforced HPC, few studies have investigated how adding natural fiber such as jute to this type of concrete might prevent spalling. In this study, the effects of high temperatures on the compressive strength and elastic modulus of HPC with PP and jute fiber (jute fiber addition ratio: 0.075 vol.%; length: 12 mm; PP fiber addition ratio: 0.075 vol.%; length: 12 mm) were experimentally investigated. Findings The work was intended to clarify the influence of elevated temperatures ranging from 20°C to 500°C on the material mechanical properties of HPC at 80 MPa. HSC with jute fiber showed a compressive strength loss of about 40 per cent at 100°C before recovering to full strength between 200°C and 300°C. Originality/value The elastic modulus of high-strength concrete decreased by 10-40 per cent between 100°C and 300°C. At 500°C, the elastic modulus was only 30 per cent of the room temperature value. The thermal expansion strain of all specimens was 0.006 at 500°C.

scholarly journals The Effect of Simulated Field Storage Conditions on Dental Restorative Materials for Military Field Use

2019 ◽  
Vol 185 (5-6) ◽  
pp. e831-e838
Author(s):  
David J Lemon ◽  
Wen Chen ◽  
Trevor Smith ◽  
April A Ford ◽  
Steven X Moffett ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Flexural Strength ◽  
High Temperatures ◽  
Flexural Modulus ◽  
Storage Conditions ◽  
Sorption Behavior ◽  
Dental Restorative Materials ◽  
Restorative Materials ◽  
Dental Restorative

Abstract Introduction Dental readiness, one critical component of medical readiness, is adversely impacted by dental emergencies. Many dental emergencies require restorative materials such as glass ionomers, resins, and zinc oxide eugenols to remedy them. The Authorized Dental Allowance List (ADAL) and Authorized Medical Allowance List (AMAL) contain the equipment and materials used by Navy dentists to treat Sailors and Marines. These supplies are subjected to harsh storage conditions on deployments. Much is known about how materials behave when stored at room temperature, but less is known about how their properties are affected after exposure to high temperatures and humidity. We subjected five dental restorative materials to storage in aggravated conditions, and then tested them to determine which products are more robust. Materials and Methods Unopened packages of Fuji Triage, Fuji IX GP (both GC America Inc., Alsip, Illinois), TPH Spectra ST Low Viscosity, Intermediate Restorative Material (both Dentsply Sirona, York, Pennsylvania), and Herculite XRV (Kerr Corporation, Orange, California) were exposed to 0, 5, or 10 days’ storage at 30–60°C with 95% relative humidity. After storage in these aggravated conditions, we tested the compressive strength, hardness, elastic modulus, flexural strength, flexural modulus, sorption, and solubility of each material. Results The physical properties of all materials were affected by storage in aggravated conditions, though the properties of some materials degraded more than others. Both glass ionomers, Fuji Triage (P = 0.0012) and Fuji IX GP (P = 0.0031), and the composite Herculite XRV (P = 0.0253) lost compressive strength after 5 or 10 days in aggravated conditions. The hardness values for all materials were affected (P < 0.05) by the aggravated conditions, though the elastic modulus of TPH Spectra was not affected (P > 0.05). None of the materials lost flexural strength (P > 0.05) or had changes in their flexural modulus (P > 0.05). The water sorption behavior of Fuji Triage (P = 0.0426) and Fuji IX GP (P = 0.0201) changed after 10 days of aggravated storage, and the solubility of all materials was altered by the harsh conditions. Conclusion Some materials degrade more than others in aggravated conditions. Both resin composite materials were more resistant to high temperatures and humidity levels than the glass ionomers tested. These changes in physical characteristics should be considered when reviewing or optimizing the ADAL/AMAL for different projected operational environments.

scholarly journals Effect of Varying Steel Fiber Content on Strength and Permeability Characteristics of High Strength Concrete with Micro Silica

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5739
Author(s):  
Babar Ali ◽  
Rawaz Kurda ◽  
Bengin Herki ◽  
Rayed Alyousef ◽  
Rasheed Mustafa ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Steel Fiber ◽  
Volume Fraction ◽  
Interactive Effects ◽  
Mineral Admixtures ◽  
Fiber Volume ◽  
Permeability Characteristics ◽  
High Fiber ◽  
Micro Silica

For the efficient and durable design of concrete, the role of fiber-reinforcements with mineral admixtures needs to be properly investigated considering various factors such as contents of fibers and potential supplementary cementitious material. Interactive effects of fibers and mineral admixtures are also needed to be appropriately studied. In this paper, properties of concrete were investigated with individual and combined incorporation of steel fiber (SF) and micro-silica (MS). SF was used at six different levels i.e., low fiber volume (0.05% and 0.1%), medium fiber volume (0.25% and 0.5%) and high fiber volume (1% and 2%). Each volume fraction of SF was investigated with 0%, 5% and 10% MS as by volume of binder. All concrete mixtures were assessed based on the results of important mechanical and permeability tests. The results revealed that varying fiber dosage showed mixed effects on the compressive (compressive strength and elastic modulus) and permeability (water absorption and chloride ion penetration) properties of concrete. Generally, low to medium volume fractions of fibers were useful in advancing the compressive strength and elastic modulus of concrete, whereas high fiber fractions showed detrimental effects on compressive strength and permeability resistance. The addition of MS with SF is not only beneficial to boost the strength properties, but it also improves the interaction between fibers and binder matrix. MS minimizes the negative effects of high fiber doses on the properties of concrete.

scholarly journals Low impact fiber reinforced material composite

2017 ◽  
Vol 7 (2) ◽  
pp. 135-147 ◽  
Author(s):  
César Antonio Juárez Alvarado ◽  
Javier Rodrigo Gonzalez Lopez ◽  
José Manuel Mendoza ◽  
Antonio Alberto Zaldivar Cadena
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Fly Ash ◽  
Environmental Impact ◽  
Flexural Strength ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Fiber Reinforced Material ◽  
Material Composite ◽  
Fiber Reinforced Cementitious Composites

Low impact fiber reinforced material compositeABSTRACTThis article investigates the mechanical behavior of fiber-reinforced cementitious composites using moderate to high contents of fly ash (FA) as a replacement for cement; the goal is to create primary building elements with low environmental impact. The experimental results showed that the compressive strength, modulus of elasticity, and post-cracking flexural strength for specimens with w/cm = 0.60 and 20% FA substitution increased with respect to the control. Moreover, the specimens with high FA substitutions had significantly lower mechanical strength values and elastic modulus values. The results indicate that it is feasible to use fiber-reinforced concrete composites as an alternative for low-environmental impact primary construction.Keywords: fiber; cementitous; composites; fly ash, impact material.

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