scholarly journals Study on Mechanical Properties and Pore Structure of Hybrid Fiber Reinforced Rubber Concrete

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1307
Author(s):  
Yushan Liu ◽  
Jianyong Pang ◽  
Qiaoqiao Chen ◽  
Weijing Yao
Keyword(s):  
Mechanical Properties ◽  
Polyvinyl Alcohol ◽  
Pore Structure ◽  
Volume Fraction ◽  
Basalt Fiber ◽  
Hybrid Fiber ◽  
Hybrid Fibers ◽  
Polyvinyl Alcohol Fiber ◽  
Rubber Particles ◽  
Rubber Concrete

In this work, to reduce the probability of brittle failure in the support structure of deeply buried high-stress soft rock roadways, hybrid-fiber reinforced rubber concrete (HFRRC) was investigated using the orthogonal test, and the effects of various factors on the performance were studied. The mechanical properties, pore structure, and microstructure of rubber concrete reinforced by basalt fiber (BF) and polyvinyl alcohol fiber (PF) were studied from macroscale, mesoscale, and microscale perspectives. The results revealed that the content of the rubber particles has a significant impact on strength. Further, the addition of the hybrid fibers to the concrete was found to have a positive effect on the splitting tensile strength and the flexural strength. However, no significant effect was observed on the compressive strength. Furthermore, it was found that the content of BF and PF have a significant impact on the energy dissipation capacity and ductility, and the influence of the PF content is greater than that of the BF content. The concrete with 10% rubber particles of 1–3 mm, a volume fraction 0.3% basalt fiber, and a volume fraction 0.2% polyvinyl alcohol fiber was obtained as the optimal mix proportions. Moreover, it was found that the random distribution of the rubber particles and the hybrid fibers optimized the pore structure, inhibited the expansion of the cracks, and reduced the brittleness of the concrete. The findings of this study can provide a useful reference for the application of an environmentally friendly material with recycled rubber aggregate and hybrid fiber.

Study on Performance about Hybrid Fiber Concrete of Airport Pavement

2014 ◽  
Vol 1065-1069 ◽  
pp. 706-709 ◽  
Author(s):  
Xiao Jun Liu ◽  
Che Fei Zhu ◽  
Yong Gen Wu ◽  
Qing Tao Liu
Keyword(s):  
Mechanical Properties ◽  
Steel Fiber ◽  
Volume Fraction ◽  
Orthogonal Experiment ◽  
Basalt Fiber ◽  
Fiber Reinforced Concrete ◽  
Hybrid Fiber ◽  
Airport Pavement ◽  
Fiber Concrete ◽  
Pavement Concrete

In order to meet the requirements of the use of aircraft, improve mechanical properties of pavement concrete, the steel fiber mixed basalt hybrid fiber reinforced concrete technical route was proposed, by using the method of orthogonal experiment, steel fiber with 1.2%,1.5%,1.8% these 3 volume fraction and basalt fiber in 0.05%,0.1%,0.15% these 3 volume fraction mixed, research the rules of its effect on the performance of airport pavement concrete.

scholarly journals Mechanical properties and microstructure of recycled mortar reinforced with hybrid fiber

2018 ◽  
Vol 7 (4) ◽  
pp. 2178 ◽  
Author(s):  
Sallehan Ismail ◽  
Mohammad Asri Abd Hamid ◽  
Zaiton Yaacob ◽  
Dzulkarnaen Ismail ◽  
Hazizan Md Akil
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Mechanical Strength ◽  
Mechanical Performance ◽  
Volume Fraction ◽  
High Strength ◽  
Strength Properties ◽  
Recycled Aggregate ◽  
Hybrid Fiber ◽  
Hybrid Fibers

This study investigated the hybrid effects of two types of microfiber, namely, polypropylene and nylon, on the mechanical properties of high-strength mortar, which produced fine recycled aggregate (FRA). The amount of microfibers was maintained at a volumetric fraction of 0.6%. The microstructure and mechanical strength properties (compressive strength and flexural strength) of recycled mortar reinforced with hybrid-size microfibers were evaluated at various curing ages. Experimental results show that the inclusion of hybrid fibers significantly influenced the mechanical performance of the recycled mortar. The hybridization fiber at volume fraction 0.3% polypropylene + 0.3% nylon yielded the most promising mechanical performance. Enhancements of 8% on compressive and 11% flexural strength were achieved at 28 days. Scanning electron microscopy observations revealed that reinforcement at the microscale prohibited the initiation and growth of cracks at the micro level. High loads were required to form macrocracks within composites, thereby improving the mechanical strength of the mortar matrix.  

scholarly journals Mechanical Properties of Hybrid Fiber Reinforced Rubber Concrete

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6028
Author(s):  
Qiang Su ◽  
Jin-Ming Xu ◽  
Yong-Dong Wang
Keyword(s):  
Mechanical Properties ◽  
Resistance Mechanism ◽  
Basalt Fiber ◽  
Volume Ratio ◽  
Hybrid Fiber ◽  
Fiber Volume ◽  
Hybrid Effect ◽  
Orthogonal Experiments ◽  
Pva Fiber ◽  
Rubber Concrete

Orthogonal experiments were designed for hybrid fiber rubber concrete (HFRC). The mechanical properties of HFRC were tested and compared with ordinary concrete. The effects of basalt fiber volume ratio (VBF), PVA fiber volume ratio (VPF) and rubber volume ratio (VR) on the compressive strength, splitting tensile strength and flexural strength of HFRC were analyzed. The results show that the strength of HFRC is the best when the volume ratio of basalt fiber is 0.3%, the volume ratio of PVA fiber is 0.2% and the volume ratio of rubber is 5%. Basalt fiber has the greatest influence on the strength of HFRC. The strength of HFRC mixed with hybrid fiber is greatly improved, which reflects the good fiber “positive hybrid effect”. With the increase of rubber volume ratio, the strength of HFRC decreases gradually. With the help of SEM and EDS, the toughening and cracking resistance mechanism of the fiber to HFRC was analyzed. Finally, the strength of HFRC was predicted by model.

scholarly journals Crack Resistance and Mechanical Properties of Polyvinyl Alcohol Fiber-Reinforced Cement-Stabilized Macadam Base

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Yi Zhao ◽  
Xuan Yang ◽  
Qingyu Zhang ◽  
Naixing Liang ◽  
Yangkai Xiang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polyvinyl Alcohol ◽  
Crack Resistance ◽  
Fiber Length ◽  
Cement Content ◽  
Strength Test ◽  
Fiber Reinforced ◽  
Polyvinyl Alcohol Fiber ◽  
Reinforced Cement ◽  
Shrinkage Property

A series of tests were carried out to evaluate crack resistance and mechanical properties of polyvinyl alcohol fiber-reinforced cement-stabilized macadam, which is widely used as pavement base or subbase composite material. Three series of cement-stabilized macadam mixtures with cement content of 3.2%, 3.6%, and 4.0% were prepared by incorporating four various contents (0, 0.6, 0.9, and 1.2 kg/m3) and lengths (12, 18, 24, and 30 mm) of polyvinyl alcohol fiber. The optimum polyvinyl alcohol fiber content, fiber length, and cement content were determined based on the mechanical properties of cement-stabilized macadam mixtures. Then, unconfined compressive strength test, compressive resilience modulus test, splitting strength test, flexural tensile strength test, drying shrinkage test, and temperature shrinkage test were carried out in this study. The results show that polyvinyl alcohol fiber-reinforced cement-stabilized prepared by optimum proportions (cement 3.6%, fiber content 0.9 kg/m3, and fiber length 24 mm) has good crack resistance. The incorporation of polyvinyl alcohol fiber can effectively improve compressive strength and splitting strength, while its effect on CRM of cement-stabilized macadam is not remarkable. The anti-dry-shrinkage property and anti-temperature-shrinkage property of the specimens are also drastically improved due to the reinforcement effect of polyvinyl alcohol fiber. Moreover, the crack resistance index is proposed to evaluate the crack resistance of materials. The crack resistance of PVA fiber-reinforced cement-stabilized macadam prepared by optimum proportions is improved by 44.4%. Consequently, the mechanical properties and crack resistance of cement-stabilized macadam are obviously improved by adding polyvinyl alcohol fiber.

Impact of Superplasticizing Agents on Physical and Mechanical Properties of Cellular Concrete

2019 ◽  
Vol 974 ◽  
pp. 181-186
Author(s):  
V.A. Perfilov ◽  
V.V. Gabova ◽  
Inessa A. Tomareva
Keyword(s):  
Mechanical Properties ◽  
Pore Structure ◽  
Pore Space ◽  
Experimental Studies ◽  
Basalt Fiber ◽  
Physical And Mechanical Properties ◽  
Foam Concrete ◽  
Cellular Concrete

The effect of superplasticizing, foam agents, various fiber aggregates on the physical and mechanical properties of cellular concrete has been studied. The article covers the results of experimental studies conducted to determine the effect of foam agents PO-6 and PB-2000, as well as polymeric and basalt fiber on the pore structure of foam concrete. The dependence between the change in density and strength of cellular concrete and the structure of its pore space has been determined.

scholarly journals Experimental Study on Mechanical Properties and Fractal Dimension of Pore Structure of Basalt–Polypropylene Fiber-Reinforced Concrete

2019 ◽  
Vol 9 (8) ◽  
pp. 1602 ◽  
Author(s):  
Ditao Niu ◽  
Daguan Huang ◽  
Hao Zheng ◽  
Li Su ◽  
Qiang Fu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Fractal Dimension ◽  
Pore Structure ◽  
Polypropylene Fiber ◽  
Splitting Tensile Strength ◽  
Fiber Reinforced Concrete ◽  
Hybrid Fibers ◽  
Air Content

This study investigates the effects of basalt–polypropylene fibers on the compressive strength and splitting tensile strength of concrete and calculates the fractal dimension of the pore structure of concrete by using a fractal model based on the optical method. Test results reveal that hybrid fibers can improve the compressive strength and splitting tensile strength of concrete, and the synergistic effect of the hybrid fibers is strongest when the contents of basalt fiber (BF) and polypropylene fiber (PF) are 0.05% each, and that the maximum increments in compressive strength and splitting tensile strength are 5.06% and 9.56%, respectively. The effect of hybrid fibers on splitting tensile strength is greater than on compressive strength. However, hybrid fibers have adverse effects on mechanical properties when the fiber content is too high. The pore structure of basalt–polypropylene fiber-reinforced concrete (BPFRC) exhibits obvious fractal characteristics, and the fractal dimension is calculated to be in the range of 2.297–2.482. The fractal dimension has a strong correlation with the air content and spacing factor: the air content decreases significantly whereas the spacing factor increases with increasing fractal dimension. In addition, the fractal dimension also has a strong positive correlation with compressive strength and splitting tensile strength. Therefore, the fractal dimension of the pore structure can be used to evaluate the microscopic pore structure of concrete and can also reflect the influence of the complexity of the pore structure on the macroscopic mechanical properties of concrete.

Development of environment-friendly CF/BF hybrid composites according to the arrangement angle and volume fraction of basalt fiber

2019 ◽  
Vol 33 (14n15) ◽  
pp. 1940024
Author(s):  
Ji-Su Choi ◽  
Soo-Jeong Park ◽  
Zixuan Chen ◽  
Yun-Hae Kim
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Environmental Problem ◽  
Volume Fraction ◽  
Hybrid Composites ◽  
External Environment ◽  
Basalt Fiber ◽  
Basalt Fibers ◽  
Shear Tests ◽  
Environment Friendly

Basalt fiber (BF) is an environmentally friendly material which can reduce environmental problem. In this study, CF/BF composite materials that can reduce the volume of carbon fiber (CF) by hybridizing BF and CF were studied. BF was specially laminated on the surface of CF so that the CF does not come into contact with the external environment. Basalt fibers were designed based on the arrangement angles and volume fraction. Evaluation by tensile, bending and intermittent shear tests, showed that the volume fraction of BF was more influential than the arrangement angles. When the volume fraction of BF was approximately 27%, high mechanical properties were obtained at all arrangement angles used in this experiment.

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