Influence of Moisture Content and Loading Rate on Flexural Toughness of Fiber Reinforced Shotcrete Remarked

2012 ◽  
Vol 450-451 ◽  
pp. 472-477 ◽  
Author(s):  
Feng Wei Ning ◽  
Jian Tong Ding ◽  
An Shuang Su ◽  
Yue Bo Cai
Keyword(s):  
Flexural Strength ◽  
Moisture Content ◽  
Steel Fiber ◽  
Loading Rate ◽  
Polypropylene Fiber ◽  
Test Method ◽  
Bending Test ◽  
Synthetic Fiber ◽  
Fiber Reinforced ◽  
Flexural Toughness

Influences of moisture content and loading rate on flexural toughness were experimentally studied for fiber reinforced shotcrete (FRSC) with steel fiber or macro synthetic polypropylene fiber. According to the four-point bending test method specified in ASTM C1609 and Chinese standard CECS 13, the flexural toughness of specimens after drying for 0h, 16h, 24h and 72h in condition of (20±2)°C and (60±5)% relative humidity was tested at a loading rate of 0.05 mm/min. For specimens after drying for 24h and 72h, flexural toughness was tested at loading rates of 0.05 mm/min, 0.10 mm/min, and 0.20 mm/min respectively. With the moisture content decreasing, the flexural toughness T100,2.0, first-peak flexural strength, and residual flexural strength at prescribed deflections of FRSC exhibited decreasing tendency. The specimens with 0.5 vol% of steel fiber showed higher T100,2.0 value than that with 0.9 vol% of macro synthetic fiber. The residual strength and flexural toughness of FRSC increased with the increase of loading rate.

Influence of Aspect Ratio of Macro Synthetic Fiber on Mechanical Properties of Shotcrete

2013 ◽  
Vol 652-654 ◽  
pp. 1226-1232
Author(s):  
An Shuang Su ◽  
Yue Bo Cai
Keyword(s):  
Flexural Strength ◽  
Moisture Content ◽  
Steel Fiber ◽  
Loading Rate ◽  
Polypropylene Fiber ◽  
Test Method ◽  
Bending Test ◽  
Synthetic Fiber ◽  
Flexural Toughness ◽  
Four Point Bending

Influences of moisture content and loading rate on flexural toughness were experimentally studied for fiber reinforced shotcrete (FRSC) with steel fiber or macro synthetic polypropylene fiber. According to the four-point bending test method specified in ASTM C1609 and Chinese standard CECS 13, the flexural toughness of specimens after drying for 0h, 16h, 24h and 72h in condition of (20±2)°C and (60±5)% relative humidity was tested at a loading rate of 0.05 mm/min. For specimens after drying for 24h and 72h, flexural toughness was tested at loading rates of 0.05 mm/min, 0.10 mm/min, and 0.20 mm/min respectively. With the moisture content decreasing, the flexural toughness T100,2.0, first-peak flexural strength, and residual flexural strength at prescribed deflections of FRSC exhibited decreasing tendency. The specimens with 0.5 vol% of steel fiber showed higher T100,2.0 value than that with 0.9 vol% of macro synthetic fiber. The residual strength and flexural toughness of FRSC increased with the increase of loading rate.

Flexural Toughness of Hybrid Fiber Reinforced Concrete under Notched Beam Three-Point Bending

2014 ◽  
Vol 906 ◽  
pp. 311-317
Author(s):  
Si Hui Xiong ◽  
Dong Tao Xia ◽  
Xiang Kun Liu
Keyword(s):  
Reinforced Concrete ◽  
Energy Absorption ◽  
Steel Fiber ◽  
Polypropylene Fiber ◽  
Fiber Reinforced Concrete ◽  
Test Method ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Flexural Toughness ◽  
Polypropylene Fiber Reinforced Concrete

In order to focus on hybrid fiber reinforced concrete flexural toughness,mixed 0.7% steel fiber/0.3% modified polypropylene fiber reinforced concrete, mixed 0.89% steel fiber/0.11% Dura fiber reinforced concrete were chosen to perform flexural toughness test. The test method is giving a central point load to the notched beam specimens (H*B*L1:150mm*150mm*550mm, h1*B1:2mm*25mm) with a 0.2 mm/min loading rate. The load we carry out should not stop until the mid span deflection is more than 3mm.Based on calculating the contribution of the fiber to the energy absorption value Dcr when the concrete cracking,the contribution of the fiber to the energy absorption value D1f when mid-span deflection is δ1,the contribution of the fiber to the energy absorption value D2f when mid-span deflection isδ2 and the equivalent flexural tensile strength feq1,feq2,the effect of the way use to hybrid fiber on the flexural toughness of concrete were investigated. The results shows that the hybrid fiber can significantly improve the flexural toughness of concrete, have favorable deformability and the ability to control crack. The result of 0.7% steel fiber/0.3% modified polypropylene fiber reinforced concrete is shown: Dcr=2185 Nmm,D1f=7634.26 Nmm,D2f=2198.67 Nmm, feq1=4.89 MPa,feq2=2.83 MPa, hence it shows the positive enhancement effect of hybrid fiber and flexural toughness increase significantly.

Influence of Moisture Content and Loading Rate on Flexural Toughness of Fiber Reinforced Shotcrete Remarked

2012 ◽  
Vol 450-451 ◽  
pp. 472-477
Author(s):  
Feng Wei Ning ◽  
Jian Tong Ding ◽  
An Shuang Su ◽  
Yue Bo Cai
Keyword(s):  
Moisture Content ◽  
Loading Rate ◽  
Fiber Reinforced ◽  
Flexural Toughness

Orthogonal Experimental Study on Properties of Hybrid Fiber Reinforced Cement Mortar

2010 ◽  
Vol 168-170 ◽  
pp. 456-459
Author(s):  
Hai Yan Yuan ◽  
Shui Zhang ◽  
Guo Zhong Li
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Steel Fiber ◽  
Cement Mortar ◽  
Polypropylene Fiber ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Factors Affecting ◽  
Fiber Fraction ◽  
Reinforced Cement

By adopting the method of orthogonal experimental design, the effect of three independent variables, that is steel fiber fraction, polypropylene fiber fraction and silica fume fraction on the compressive strength, flexural strength and shrinkage of cement mortar was studied. The results indicate that steel fiber is one of the most important factors affecting compressive strength and shrinkage, and polypropylene fiber is one of the most important factors affecting flexural strength and shrinkage of cement mortar. By using deviation analysis to analyze the orthogonal experiment results, the optimized mix proportion of hybrid fiber reinforced cement mortar is determined. The hybrid effect of steel fiber and polypropylene fiber on the properties of cement mortar is discussed.

scholarly journals Flexural Performance of a New Hybrid Basalt-Polypropylene Fiber-Reinforced Concrete Oriented to Concrete Pipelines

Fibers ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 43
Author(s):  
Zhiyun Deng ◽  
Xinrong Liu ◽  
Ninghui Liang ◽  
Albert de la Fuente ◽  
Haoyang Peng
Keyword(s):  
Reinforced Concrete ◽  
Flexural Strength ◽  
Crack Width ◽  
Polypropylene Fiber ◽  
Basalt Fiber ◽  
Fiber Reinforced Concrete ◽  
Bending Test ◽  
Fiber Reinforced ◽  
Flexural Performance ◽  
Polypropylene Fiber Reinforced Concrete

The bending performance of a basalt-polypropylene fiber-reinforced concrete (HBPFRC) was characterized by testing 24,400 × 100 × 100 mm3 prismatic specimens in a four-point bending test JSCE-SF4 configuration. The type and content of both fibers were varied in order to guarantee different target levels of post-cracking flexural performance. The results evidenced that mono-micro basalt fiber reinforced concrete (BFRC) allows the increase of the flexural strength (pre-cracking stage), while macro polypropylene fiber reinforced concrete (PPFRC) can effectively improve both bearing capacity and ductility of the composite for a wide crack width range. Compared with the plain concrete specimens, flexural toughness and equivalent flexural strength of macro PPFRC and the hybrid fiber-reinforced concrete (HFRC) increased by 3.7–7.1 times and 10–42.5%, respectively. From both technical and economic points of view, the optimal mass ratio of basalt fiber (BF) to polypropylene fiber (PPF) resulted in being 1:2, with a total content of 6 kg/m3. This HFRC is seen as a suitable material to be used in sewerage pipes where cracking control (crack formation and crack width control) is of paramount importance to guarantee the durability and functionality of the pipeline as well as the ductility of the system in case of local failures.

scholarly journals Study of the Influence of Fibres Type and Dosage on Properties of Concrete for Airport Pavements

2019 ◽  
Vol 8 (1) ◽  
pp. 102-113
Author(s):  
Mihai Dicu ◽  
Andreea Matei ◽  
Constantin Dorinel Voiniţchi
Keyword(s):  
Flexural Strength ◽  
High Performance ◽  
Steel Fiber ◽  
Fiber Type ◽  
Polypropylene Fiber ◽  
Plain Concrete ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Portland Cement Concrete ◽  
Bearing Strength

Abstract The paper follows the potential practice of fiber reinforced concrete (FRC) as a solution for airport`s runway pavements, in order to increase the bearing strength, resulting in decreasing the height of the concrete layer that is currently used. Experimentally, the study focuses on the properties of fiber reinforced Portland cement concrete using 3 different percentages (0.5%, 1% and 1.5% of the concrete volume) and 4 different types of fiber (for 1% percentage – hooked steel fiber 50 mm length, hooked steel fiber 30 mm length, crimped steel fiber 30 mm length and polypropylene fiber 50 mm lenght), using as reference a plain concrete with 5 MPa flexural strength. More exactly, the study presents the change in compressive and flexural strength, shrinkage, thermal expansion factor, elastic modulus and Poisson`s ratio over fiber type and dosage. For the highest performance concrete (7 MPa flexural strength), it has been made a study using two methods for rigid airport pavements design (general method and optimized method), and one method for evaluation of bearing strength (ACN – PCN method), which is compared to a plain 5 MPa concrete. Furthermore, the decrease in the slab`s thickness proportionally to the growth of the flexural strength is emphasized by evaluating the slab`s height for a high performance 9 MPa concrete using both design methods.

Flexural Toughness of Hybrid Fiber Reinforced High-Performance Concrete under Three-Point Bending

2013 ◽  
Vol 357-360 ◽  
pp. 1110-1114
Author(s):  
Dong Tao Xia ◽  
Xiang Kun Liu ◽  
Bo Ru Zhou
Keyword(s):  
Tensile Strength ◽  
High Performance ◽  
Steel Fiber ◽  
High Performance Concrete ◽  
Volume Fraction ◽  
Polypropylene Fiber ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Fiber Volume ◽  
Flexural Toughness

A set of new hybrid fiber reinforced high-performance concrete was developed and studied by experiment. The fibers incorporated the concrete are the collection of the steel fiber, modified polypropylene fiber and polypropylene with total fiber content not more than 1%. And the compressive test, splitting tensile test and the flexural toughness test were performed on eight groups of specimens. Based on the load-deflection and load-CMOD curves and the equivalent flexural tensile strength, the effect of fiber volume fraction and hybrid mode upon concrete's mechanical properties and post-peak behavior were investigated. The test results show that the mixing of the three different fibers can increase concrete's splitting tensile strength and flexural toughness more effectively with no significantly effect on compressive strength. The mixture of the three different fibers exist the optimization problem. Based on the results of the analysis, the compatible proportion of the three fibers is 0.7% steel fiber, 0.19% modified polypropylene fiber and 0.11% polypropylene fiber.

Experimental Research on the Mechanical Property of Hybrid Fiber Reinforced Ferrocement

2013 ◽  
Vol 639-640 ◽  
pp. 329-333
Author(s):  
Sheng Ping Chen ◽  
Gang Tian
Keyword(s):  
Mechanical Property ◽  
Tensile Strength ◽  
Steel Fiber ◽  
Steel Wire ◽  
Polypropylene Fiber ◽  
Wire Mesh ◽  
Bending Test ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Volume Fractions

The tensile and bending behaviour of steel-polypropylene hybrid fiber reinforced ferrocement were investigated in this paper through direct tensile test and four-point bending test. Different volume fractions of steel fiber, polypropylene fiber and steel wire mesh were considered. A total of 42 tensile and bending specimens were tested. Experimental results showed that, compared to plain ferrocement, the cracking tensile strength and the ultimate tensile strength of steel-polypropylene hybrid fiber reinforced ferrocement with 0.5% volume fractions of steel fiber and 1.0% volume fractions of polypropylene fiber increased by 9% and 15% , and the cracking moment and the ultimate moment also increased by 29% and 52%. It can be concluded that this mix ratio had best effect on the mechanical property of ferrocement.

scholarly journals Evaluation of Fiber Type and Water-Binder Ratio Influence on Concrete Properties

2019 ◽  
Vol 9 (1) ◽  
pp. 6444-6450
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Flexural Strength ◽  
Steel Fiber ◽  
Fiber Type ◽  
Linear Regression Analysis ◽  
Polypropylene Fiber ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete

This paper enumerates the experimental study on workability and strength properties of concrete containing different dosage of polypropylene fiber from 0.1% to 0.6% and 1.0% to 3.5% of steel fiber. Water - binder ratio, fiber type and fiber dosage influence on flow behaviour, compressive strength, flexural strength and brittleness ratio were analysed. Experimental results were substantiated by linear regression analysis considering 95% confidence level. Reference mixes with 0.34 and 0.36 water- binder were prepared for results comparison with polypropylene and steel fiber reinforced concretes. Test results showed comparatively higher workability reduction in polypropylene fiber reinforced concrete. Compressive strength test results of fiber reinforced concrete indicted an optimum fiber content of 0.30% of polypropylene fiber and 2.50% of steel fiber. Steel fiber reinforced concrete displayed continuous increase in flexural strength with 44.46% average increase. Brittleness ratio, which was the ratio of flexural strength and compressive strength showed maximum value of 0.24 for concrete with 3.5 % steel fiber and 0.36 w/B ratio. Linear regression analysis revealed good correlation of flow properties with w/B ratio irrespective of fiber type. Though the compressive strength had low correlation with fiber type and w/B ratio, steel fiber reinforced concrete indicated up to 0.987 coefficient of determination with flexural strength.

scholarly journals Flexural Performance of a New Hybrid Basalt-polypropylene Fiber-reinforced Concrete Oriented to Concrete Pipelines

2021 ◽  
Author(s):  
Zhiyun Deng ◽  
Liu Xinrong ◽  
Liang Ninghui ◽  
Albert de la Fuente ◽  
Haoyang Peng
Keyword(s):  
Reinforced Concrete ◽  
Flexural Strength ◽  
Crack Width ◽  
Polypropylene Fiber ◽  
Basalt Fiber ◽  
Fiber Reinforced Concrete ◽  
Bending Test ◽  
Fiber Reinforced ◽  
Flexural Performance ◽  
Polypropylene Fiber Reinforced Concrete

The bending performance of a basalt-polypropylene fiber-reinforced concrete (HBPFRC) was characterized by testing 24 400×100×100 mm3 prismatic specimens in a four-point bending test JSCE-SF4 configuration. The type and content of both fibers was varied in order to guarantee different target levels of post-cracking flexural performance. The results evidenced that mono-micro basalt fiber reinforced concrete (BFRC) allows the increase of the flexural strength (pre-cracking stage), while macro polypropylene fiber reinforced concrete can effectively improve both bearing capacity and ductility of the composite for a wide crack width range. Compared with the plain concrete specimens, flexural toughness and equivalent flexural strength of macro polypropylene fiber-reinforced concrete (PPFRC) and the hybrid fiber-reinforced concrete (HFRC) increased by 3.7~7.1 times and 10%~42.5%, respectively. From both technical and economic points of view, the optimal mass ratio of basalt fiber to polypropylene fiber resulted to be 1:2, with a total content of 6 kg/m3. This HFRC is seen as a suitable material to be used in sewerage pipes where cracking control (crack formation and crack width control) is of paramount importance to guarantee the durability and functionality of the pipeline as well as the ductility of the system in case of local failures.

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