scholarly journals Orthogonal Analysis on Mechanical Properties of Basalt–Polypropylene Fiber Mortar

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2937
Author(s):  
Huimin Chen ◽  
Chunyan Xie ◽  
Chao Fu ◽  
Jing Liu ◽  
Xiuli Wei ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Volume Content ◽  
Fiber Length ◽  
Content Volume ◽  
Polypropylene Fiber ◽  
Basalt Fiber ◽  
Test Method ◽  
Test Results ◽  
Fiber Volume

Orthogonal test method was applied to analyze the strength properties of basalt-polypropylene mortar. The effect of basalt fiber length, polypropylene fiber length, basalt fiber volume content and polypropylene fiber volume content on the 28 d cube compressive strength and flexural strength were investigated. Test results show that comparing with flexural strength, the influence of basalt fiber length and polypropylene fiber length on compressive strength of mortar was greater than on flexural strength. The length of polypropylene fibers contributes the highest to the flexural strength. The effect of basalt fiber on mortar strength is the largest with 6 mm length and 4% content. Polypropylene fiber length has the greatest influence on the compressive strength of fiber mortar, followed by basalt fiber volume content. Volume content of polypropylene fiber has the greatest influence on flexural strength of fiber mortar, followed by polypropylene fiber length. According to the scoring of the efficacy coefficient method, the best ratio combination for compressive and flexural strength was the basalt fiber length of 9 mm, polypropylene fiber length of 6 mm, basalt fiber volume content of 4% and polypropylene fiber volume content of 4%. Compared with the blank samples, the 28 d compressive strength and 28 d flexural strength of the cement mortar samples were increased by 27.4% and 49% respectively. According to the test results, the properties of the fiber were analyzed and evaluated and the mechanism of fiber action and fiber microstructure were analyzed.

scholarly journals Studying the behavior of geopolymer concretes under repeated loadings

2021 ◽  
Vol 68 (1) ◽  
Author(s):  
Osamah M. G. Al-Kerttani ◽  
Ammar Mutar
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Dynamic Loading ◽  
Brittle Material ◽  
Volume Content ◽  
Polypropylene Fiber ◽  
Statistical Test ◽  
Geopolymer Concrete ◽  
Fiber Reinforced ◽  
Fiber Volume

AbstractThis article investigates utilization of polypropylene microfibers as reinforcement in geopolymer concrete to enhance the ductility characteristics since the geopolymer concrete is considered a brittle material. The polypropylene microfibers were added to geopolymer concrete at the fiber volume content of 0.5%, 1.0%, and 1.5%. In this article, a slump test and compressive strength were tested for geopolymer concretes to measure the effect of polypropylene microfibers on geopolymer concretes. Also, static flexural strength and dynamic loading were applied to find out the attitude of polypropylene fiber-reinforced geopolymer concrete and to measure both the deflection and number of load cycles until failure. While comparing the results with reference geopolymer concrete, all samples were tested at 28 days and, finally, a statistical test was carried out. The results concluded that the use of polypropylene microfibers improves the compressive strength and enhances the properties of polypropylene fiber-reinforced geopolymer concretes, increases the loading for the appearance of the first crack, and decreases the deflection of polypropylene fiber-reinforced geopolymer concretes compared with reference geopolymer concrete.

scholarly journals Influence of the Fiber Volume Content on the Durability-Related Properties of Polypropylene-Fiber-Reinforced Concrete

2020 ◽  
Vol 12 (2) ◽  
pp. 549
Author(s):  
Chenfei Wang ◽  
Zixiong Guo ◽  
Ditao Niu
Keyword(s):  
Reinforced Concrete ◽  
Flexural Strength ◽  
Volume Content ◽  
Polypropylene Fiber ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Freeze Thaw ◽  
Chloride Environment ◽  
Polypropylene Fiber Reinforced Concrete

Polypropylene-fiber-reinforced concrete impacts the early shrinkage during the plastic stage of concrete, and the fiber volume content influences the durability-related properties of concrete. The purpose of this paper was to investigate the influence of fiber volume content on the mechanical properties, durability, and chloride ion penetration of polypropylene-fiber-reinforced concrete in a chloride environment. Tests were carried out on cubes and cylinders of polypropylene-fiber-reinforced concrete with polypropylene fiber contents ranging from 0% to 0.5%. Extensive data from flexural strength testing, dry–wet testing, deicer frost testing, and chloride penetration testing were recorded and analyzed. The test results show that the addition of the fiber improves the failure form of the concrete specimens, and 0.1% fiber content maximizes the compactness of the concrete. The flexural strength of specimen C2 with 0.1% fiber shows the highest strength obtained herein after freeze–thaw cycling, and the water absorption of specimen C2 is also the lowest after dry–wet cycling. The results also indicate that increasing the fiber volume content improves the freeze–thaw resistance of the concrete in a chloride environment. Chlorine ions migrate with the moisture during dry–wet and freeze–thaw cycling. The chlorine ion diffusion coefficient (Dcl) increases with increasing fiber content, except for that of specimen C2 in a chloride environment. The Dcl during freeze–thaw cycling is much higher than that during dry–wet cycling.

Effect of Polypropylene Fiber on Strength and Flexural Properties of Concrete Containing Silica Fume

2011 ◽  
Vol 346 ◽  
pp. 30-33
Author(s):  
Hong Wei Wang
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Silica Fume ◽  
Modulus Of Elasticity ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Flexural Modulus ◽  
Polypropylene Fiber ◽  
Flexural Properties ◽  
Fiber Volume

A designed experimental study has been conducted to investigate the effect of polypropylene fiber on the compressive strength and flexural properties of concrete containing silica fume, a large number of experiments have been carried out in this study. The flexural properties include flexural strength and flexural modulus of elasticity. On the basis of the experimental results of the specimens of six sets of mix proportions, the mechanism of action of polypropylene fiber on compressive strength, flexural strength and flexural modulus of elasticity has been analyzed in details. The results indicate that there is a tendency of increase in the compressive strength and flexural strength, and the flexural modulus of elasticity of concrete containing silica fume decrease gradually with the increase of fiber volume fraction.

The Crack Resistance and Impermeability Properties of Mortar with PP Fiber and Capillary Crystalline Material and their Mechanism

2010 ◽  
Vol 168-170 ◽  
pp. 1381-1387
Author(s):  
Wei Huang ◽  
Ping Wang ◽  
Wan Yun Yin ◽  
Li Zhang ◽  
Wei Shu
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Crack Resistance ◽  
Polypropylene Fiber ◽  
Crystalline Material ◽  
Test Results ◽  
Mortar Matrix

According to the principle that fiber resist crack and cement-based capillary crystalline impermeability, the paper chose the mortar added with polypropylene fiber and SJ capillary crystalline material as the research object. Experiments on mechanical properties, crack resistance and impermeability of mortar were conducted with one material being added to the mortar as well as both materials being added to. The test results indicate that the ratio of compressive strength to flexural strength of mortar could be reduced, the time of cracks occurrence in mortar matrix would be delayed, and the minimum cracking coefficient can amount to 5% on the condition that the two materials are both added to the mortar, moreover, the mortar’s first and second impermeability is significant. Furthermore, the paper also discusses the mechanism of mortar’s crack resistance and impermeability which is mixed with polypropylene fiber and capillary crystalline material.

scholarly journals The Effects of Fiber Length and Volume on Material Properties and Crack Resistance of Basalt Fiber Reinforced Concrete (BFRC)

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Xinzhong Wang ◽  
Jun He ◽  
Ayman S. Mosallam ◽  
Chuanxi Li ◽  
Haohui Xin
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fiber Length ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Basalt Fiber ◽  
Physical And Mechanical Properties ◽  
Fiber Reinforced Concrete ◽  
Fiber Volume ◽  
Shrinkage Cracking

Basalt fiber reinforced concrete (BFRC) has been widely utilized in various constructions such as buildings, large industrial floors, and highways, due to its excellent physical and mechanical properties, as well as low production cost. In order to address the influence of basic parameters such as fiber volume fraction (0.05∼0.40%), fiber length (12∼36 mm) of BF, and compressive strength (30, 40, and 50 MPa) of concrete on both physical and mechanical properties of BFRC including compressive strength, tensile and flexural strength, workability, and anti-dry-shrinkage cracking properties, a series of standard material tests were conducted. Experimental results indicated that clumping of fibers may occur at relatively higher fiber volume fraction resulting in mixing and casting problems. Based on experimental values of mechanical properties and anti-dry-shrinkage cracking resistance of BFRC, the reasonable basalt fiber length and fiber volume fractions are identified. The addition of a small amount of short basalt fibers can result in a considerable increase in both compressive strength and modulus of rupture (MoR) of BFRC and that the proposed fiber length and content are 12.0 mm and 0.10%∼0.15%, respectively. As the length of basalt fibers increases, the development of early shrinkage cracks decreases initially and then increases slowly and the optimal fiber length is 18.0 mm. Results of the study also indicated that early shrinkage cracks decrease with the increase of fiber volume fraction, and when the volume fraction of 0.20% is used, no cracks were observed. All the findings of the present study may provide reference for the material proportion design of BFRC.

scholarly journals Impermeability Durability of SCC Reinforced with Fibrillated Polypropylene Fiber

2015 ◽  
Vol 9 (1) ◽  
pp. 159-166
Author(s):  
X.B. He ◽  
Y. Li ◽  
Q. Shen
Keyword(s):  
Volume Content ◽  
Fiber Length ◽  
Slenderness Ratio ◽  
Polypropylene Fiber ◽  
Total Porosity ◽  
Fiber Content ◽  
Fiber Volume ◽  
Flexural Tensile Strength ◽  
Mix Proportion ◽  
Relative Water

The paper studied the influences of the volume content and slenderness ratio of fibrillated polypropylene fiber on the impermeability durability of self-consolidating concrete (SCC) reinforced with the fibrillated polypropylene fiber, and proposed to use the modified relative permeability coefficient method to evaluate the water-resistant properties of SCC reinforced with the fiber. Also, the influence mechanism of the fiber on the permeability of the concrete has been analyzed according to the mercury injection test, scanning electronic microscope (SEM) observation and the basic principles of fracture mechanics. Results showed that: 1) the total porosity of SCC gradually increased with the increase in the fiber content; 2) the harmful porosity of SCC decreased firstly and then increased with the increase in the fiber content, while the harmful porosity increased with the increase in the fiber length; 3) when the reference mix proportion of SCC was kept constant, the fiber volume content was not more than 0.10 %, and the appropriate fiber length ranged from 12 to 15mm; 4) when the volume content is no more than 0.15%, the hardened SCC reinforced with fibrillated polypropylene fiber possessed good water impermeability gradation (＞P12); the splitting strength and flexural tensile strength of the hardened SCC reinforced with fibrillated polypropylene fiber increased with the addition of the fiber content; the relative water penetration coefficient of the hardened SCC reinforced with fibrillated polypropylene fiber decreased with the addition of the fiber content firstly and then increased; the Coulomb value first increased smoothly (the maximum Coulomb value is less than 2000C, and low according to JTJ/T 193-2009 and ASTM C 1202), and then increased sharply.

scholarly journals Strength characteristics of fiber-reinforced light shotcrete

2020 ◽  
Vol 192 ◽  
pp. 01020
Author(s):  
Konstantin Alekseev ◽  
Alexsandr Kurilko
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Energy Intensity ◽  
Polypropylene Fiber ◽  
Basalt Fiber ◽  
Fiber Content ◽  
Strength Characteristics ◽  
Pile Driver ◽  
Bending Loads ◽  
Heat Shielding

The article presents the regularities of the flexural and compressive strength variation, as well as the energy intensity of destruction of light heat-shielding vermiculite concrete, depending on the content of polypropylene or basalt fiber. The paper stresses that the greatest increase in flexural strength of 40% is observed at the polypropylene or basalt fiber that the greatest increase in flexural strength of 40% is observed at the polypropylene or basalt fiber of 2 and 2-4% respectively. As the basalt fiber content increases from 1 to 4%, the compressive strength increases from 42 to 83%. The resistance of vermiculite concrete to dynamic bending loads when the polypropylene fiber ranges from 0.5 to 2% by a factor of 2.5 4.2. With basalt fiber content of 1 to 4% the energy intensity of destruction increases 1.5 2.5 times.Specific energy intensity of destruction of samples reinforced with basalt fiber increases by 2.3 ÷ 2.7 times during volumetric destruction of the specimens under study on a vertical pile driver. The regularities obtained in the course of the studies indicate that fiber reinforcement of light heat-shielding vermiculite concrete increase its strength characteristics and thereby expand the scope of its application.

scholarly journals Impact of Fire on Mechanical Properties of Slurry Infiltrated Fiber Concrete (SIFCON)

2020 ◽  
Vol 6 ◽  
pp. 12-23
Author(s):  
Anwar Saad Abbas ◽  
Mohammed Mansour Kadhum
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Flexural Strength ◽  
Elevated Temperatures ◽  
Partial Replacement ◽  
Test Results ◽  
Fiber Volume ◽  
Design Curve ◽  
Fire Flame

This research aims to shed light on the fire flame effect on some mechanical properties of SIFCON samples, such as compressive strength, flexural strength and modulus of elasticity and comparing the results with CEN design curve and CEB. Higher temperature resistance is one of the most important parameters affecting the durability and service life of the material. This study comprised of casting and testing SIFCON specimens with 6% fiber volume before and after exposure to elevated temperatures. Two fire exposure duration of 1 and2 hours were investigate. In addition to room temperature, Silica fume was used as a partial replacement (10%) by weight of cement. It was found from the results achieved that after exposure to high temperatures, compressive strength, flexural strength and elastic modulus decreased. The drastically reduction of compressive strength took place with increasing temperature.  The residual compressive strength, flexural strength and elastic modulus at 1010 °C were in the range of (58.4 to 80.1%), (81.6 to 78.7%) and (30.4 to 32.8%) respectively. The compressive strength test results of this study together with results obtained by other investigators were compared with CEB strength-reduction curve and that of CEN. It was noticed that the test results agreed with CEN design curve rather than with that of CEB.

scholarly journals Mechanical properties of concrete reinforced with hybrid polypropylene- PET waste fibers

2021 ◽  
Vol 8 (1) ◽  
pp. 10-22
Author(s):  
Sary Hussein ◽  
◽  
Azad Mohammed
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Fiber Length ◽  
Laboratory Experiments ◽  
Polypropylene Fiber ◽  
Strength Reduction ◽  
Hybrid Fiber ◽  
Good Opportunity ◽  
Pet Waste ◽  
Compressive Strength Of Concrete

In this article, flexural strength and compressive strength of concrete containing polypropylene fiber (PP), polyethylene terephthalate (PET) waste fiber and a combination between them were experimentally investigated. For this reason, laboratory experiments were performed on a total of 40 mixes. Results show that compressive strength property of concrete reinforced with PET waste fiber is not comparable to that of concrete reinforced with PP fiber, in which there is a compressive strength reduction, and the effect of PET fiber length on the strength is not important. Behavior of concrete contained PET waste fiber in flexure was found better. There is a good opportunity to use a hybrid fiber (25% PET and 75% PP) to enhance flexural strength of concrete.

scholarly journals Compressive Strength of Modified FRP Hybrid Bars

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1898
Author(s):  
Marek Urbański
Keyword(s):  
Compressive Strength ◽  
Modulus Of Elasticity ◽  
Basalt Fiber ◽  
Test Method ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Free Length ◽  
Compression Properties ◽  
Reinforced Polymer ◽  
Frp Bars

A new type of HFRP hybrid bars (hybrid fiber reinforced polymer) was introduced to increase the rigidity of FRP reinforcement, which was a basic drawback of the FRP bars used so far. Compared to the BFRP (basalt fiber reinforced polymer) bars, modification has been introduced in HFRP bars consisting of swapping basalt fibers with carbon fibers. One of the most important mechanical properties of FRP bars is compressive strength, which determines the scope of reinforcement in compressed reinforced concrete elements (e.g., column). The compression properties of FRP bars are currently ignored in the standards (ACI, CSA). The article presents compression properties for HFRP bars based on the developed compression test method. Thirty HFRP bars were tested for comparison with previously tested BFRP bars. All bars had a nominal diameter of 8 mm and their nonanchored (free) length varied from 50 to 220 mm. Test results showed that the ultimate compressive strength of nonbuckled HFRP bars as a result of axial compression is about 46% of the ultimate strength. In addition, the modulus of elasticity under compression does not change significantly compared to the modulus of elasticity under tension. A linear correlation of buckling load strength was proposed depending on the free length of HFRP bars.

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