Crack Resistance of Concretes Reinforced with Polypropylene Fiber

2020 ◽  
pp. 474-481
Author(s):  
Yurii Turba ◽  
Sergii Solodkyy
Keyword(s):  
Crack Resistance ◽  
Polypropylene Fiber

Silica Modified PP Fiber for Improving Crack-Resistance of Cementitious Composites

2011 ◽  
Vol 332-334 ◽  
pp. 2058-2064 ◽  
Author(s):  
Zhi Qian Yang ◽  
Jian Zhong Liu ◽  
Jia Ping Liu ◽  
Chang Feng Li ◽  
Hua Xin Zhou
Keyword(s):  
Crack Resistance ◽  
Sol Gel ◽  
Polypropylene Fiber ◽  
Chemical Deposition ◽  
Cementitious Materials ◽  
Nano Particles ◽  
Cement Matrix ◽  
Interfacial Property ◽  
Nano Silica ◽  
Fiber Matrix

To improve the interfacial bonding properties of polypropylene fiber-cement matrix, a new type of nano-silica modified polypropylene fibers was prepared by direct blend-spinning. As a comparison, Another polypropylene fiber was modified by surface chemical deposition of the silica particles by sol-gel method. The distribution of nano-particles on the fiber surface was observed with scanning electron microscope (SEM). This paper focuses on the effects on crack-resistance properties of fiber reinforced mortar(FRM) and present the mechanism of improving fiber-matrix interfacial properties, especially. The results demonstrate that the modified fiber with well-distributed of nano-silica has excellent mechanical properties, and crack resistance. The interfacial property of fiber-matrix is improved because of silica’s hydration activity. As the use of two kinds of modified fiber, the cementitious materials crack area is significantly decreased. In conclusion, the modified fiber by chemical deposition method which has slightly better overall performance.

Preparation and Performances of Self-Compacting Concrete Used in the Joint Section between Steel and Concrete Box Girders of Edong Yangtze River Highway Bridge

2010 ◽  
Vol 168-170 ◽  
pp. 334-340
Author(s):  
Bei Xing Li ◽  
Ai Jun Guan ◽  
Ming Kai Zhou
Keyword(s):  
Crack Resistance ◽  
Yangtze River ◽  
Steel Fiber ◽  
Polypropylene Fiber ◽  
Scale Model ◽  
Fiber Reinforced ◽  
Freezing And Thawing ◽  
Self Compacting Concrete ◽  
Box Girders ◽  
Joint Section

The joint section between steel and concrete box girders is the key localization of the super-long span hybrid girder cable-stayed bridge in the Edong Yangtze River, a high strength self-compacting concrete (SCC) was required to use in the joint section. This paper systematically investigated the performances of three types of C55 grade self-compacting concretes (SCCs), such as plain SCC, micro-expansion and polypropylene fiber reinforced SCC and steel fiber reinforced SCC. The results indicated that the steel fiber reinforced SCC had the best workability and mechanical properties. The flexural toughness of the steel fiber reinforced SCC was much better than that of the other two types of concretes. The addition of steel fiber, or polypropylene fiber and expansive agent improved the crack resistance of SCC, and the micro-expansion and polypropylene fiber SCC reinforced had better crack resistance than steel fiber reinforced SCC. The three types of SCCs have very high chloride penetration resistance and advanced freezing and thawing resistance. Moreover, the test achievement of concrete casting technology for the full-scale model of steel girder chambers in the joint section is introduced. The steel fiber reinforced SCC was preferred to be used in the steel-concrete joint section.

Experimental Study on Flexural Toughness of Steel-Polypropylene Fiber Reinforced Concrete

2011 ◽  
Vol 261-263 ◽  
pp. 156-160 ◽  
Author(s):  
Zhi Gang Ren ◽  
Peng Tao Hu ◽  
You Zou
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Crack Resistance ◽  
Polypropylene Fiber ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Flexural Toughness ◽  
Macro Scale ◽  
Polypropylene Fiber Reinforced Concrete

The Steel-polypropylene fiber reinforced concrete take full advantage of steel fiber’s macro-scale crack resistance function on the concrete as well as the polypropylene fiber’s micro-scale crack resistance and toughening effect on the concrete matrix. In this paper, the three kinds of concrete specimens including plain high-strength concrete, steel fiber reinforced concrete and steel-polypropylene fiber concrete are selected for a flexural toughness experimental study, their compressive strength and deformation performance are analyzed, and their toughness index are investigated with ASTM-C1018 and PCS(post-crack strength) method. The results show that steel-polypropylene fiber reinforced concrete has better strength and toughness property as well as deformation performance.

Influences of Polypropylene Fiber on Properties of Foam Concrete with Iron Tailings

2014 ◽  
Vol 1004-1005 ◽  
pp. 1575-1578
Author(s):  
Li Guang Xiao ◽  
Chang Liu ◽  
Shi Ting Zhang
Keyword(s):  
Crack Resistance ◽  
Frost Resistance ◽  
Polypropylene Fiber ◽  
High Strength ◽  
Pore Wall ◽  
High Porosity ◽  
Foam Concrete ◽  
Insulation Property ◽  
Industrial Processing ◽  
Thermal Insulation Property

Iron tailings are mineral wastes obtained from industrial processing and magnetic separation of iron ore. Foam concrete with iron tailings can be made with iron tailings, cement, fly ash, silica fume, polypropylene fiber, superplasticizer, early strength agent, accelerating agent and foaming agent. The influences of polypropylene fiber on the crack resistance and frost resistance of foam concrete have been investigated in this study. Further, the microstructure of foam concrete was observed. This result demonstrates that polypropylene fiber has greatly increased the crack resistance and frost resistance of foam concrete. The pore structure of foam concrete is improved obviously by polypropylene fiber. Due to the uniformly distributed pores, high porosity and rather complete pore wall, the mechanical properties and thermal properties of foam concrete are excellent. The foam concrete with high-strength and excellent thermal insulation property develops a new route for the comprehensive utilization of iron tailings.

The Effect of Organic Fibers on Crack Resistance of Concrete and Applicable for Secondary Lining

2011 ◽  
Vol 374-377 ◽  
pp. 811-814 ◽  
Author(s):  
Qing Yu Cao ◽  
Wei Sun ◽  
Li Ping Guo
Keyword(s):  
Crack Resistance ◽  
Work Performance ◽  
Polypropylene Fiber ◽  
Cellulose Fiber ◽  
Concrete Surface ◽  
Wall Rock ◽  
Polyethylene Fiber ◽  
Secondary Lining ◽  
Pva Fiber ◽  
Resistance Performance

In this paper, concrete incorporated organic fibers, i.e., polyvinyl alcohol fiber (PVA fiber), polypropylene fiber (PP fiber), cellulose fiber (UF fiber), polyethylene fiber (PETF) was produced. The properties measured included strength and crack resistance performance of the concrete. The effect of organic fibers on the crack resistance properties was investigated. Test results indicated that the organic fibers of different types could reduce the size and amount of crack source; organic fibers provided better enhancement for shrinkage resistance of concrete; Cellulose fiber concrete applied for secondary lining under the Ⅲ wall rock, both work performance and strength index satisfy the design demand, and concrete surface cannot detect crack after 280 days.

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.

The Effect of Organic Fibers on Crack Resistance and Permeability of High Performance Concrete

2011 ◽  
Vol 94-96 ◽  
pp. 1531-1534
Author(s):  
Qing Yu Cao ◽  
Wei Sun ◽  
Li Ping Guo
Keyword(s):  
Crack Resistance ◽  
High Performance ◽  
High Performance Concrete ◽  
Volume Fraction ◽  
Polypropylene Fiber ◽  
Cellulose Fiber ◽  
Organic Fiber ◽  
Water Permeation ◽  
Polyethylene Fiber ◽  
Pva Fiber

In this paper, high-performance concrete (HPC) incorporated organic fibers, i.e., polyvinyl alcohol fiber (PVA fiber), polypropylene fiber (PP fiber), cellulose fiber (UF fiber), polyethylene fiber (PETF) was produced. The properties measured included strength, crack resistance performance and water permeation of the concrete. The effect of organic fibers on the shrinkage and water permeation properties was investigated. Test results indicated that the organic fibers of different types could reduce the size and amount of crack source; organic fibers provided better enhancement for shrinkage resistance and impermeability of HPC; the improvement of the shrinkage resistance and the impermeability of the concrete resulted from the use of organic fiber, which was dependent on the types, total volume fraction and of fibers, proportions of organic fiber.

The Analysis on how the Polypropylene Fiber Reinforced Concrete Works

2010 ◽  
Vol 163-167 ◽  
pp. 4580-4584
Author(s):  
Shi Jie Wang ◽  
Xun Zhu ◽  
Wei Wang ◽  
Jun Li
Keyword(s):  
Reinforced Concrete ◽  
Crack Resistance ◽  
Load Transfer ◽  
Polypropylene Fiber ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Starting Point ◽  
Intrinsic Quality ◽  
Load Transfer Effect ◽  
The Impact

In this paper, we take the polypropylene fibers in concrete mechanisms as the starting point, then analysis the impact of the following four effects on the properties of polypropylene fiber concrete: thickening effect, toughening effect, crack resistance effect, load transfer effect, from which was out the following useful conclusions: the rate of low-doped fiber reinforced concrete with polypropylene fiber content increases, can further reduce the spacing between fibers in concrete to enhance crack resistance effect, the intrinsic quality of concrete with high resistance to dynamic load characteristics of sensitivity is also can be improved, and after the concrete has better crack toughness, with due extension of time to eliminate vibration molding concrete thickening effect on the strength of the adverse effects; incorporation activity of mixed materials.

Analysis of Crack Resistance for Hybrid Fiber Mortar

2013 ◽  
Vol 779-780 ◽  
pp. 222-225 ◽  
Author(s):  
Yi Li ◽  
Jin Xia Dong ◽  
Shuang Zhang ◽  
Ke Hui Tong
Keyword(s):  
Crack Resistance ◽  
Cement Mortar ◽  
Polypropylene Fiber ◽  
Basalt Fiber ◽  
Fiber Types ◽  
Performance Tests ◽  
Hybrid Fiber ◽  
Plate Method ◽  
Cracking Performance ◽  
The Impact

Due to the poor reproducibility of traditional plate method, the new knife-edge binding method is chosen to study the effects and the impact law in the crack resistance of the cement mortar with fiber in it. Mortar specimens with an equal volume of ash (0.1%) single-doped, mixed-doped polypropylene fiber and basalt fiber compared to the plain matrix mortar specimens on cracking performance tests within 24h. The results showed that: For the single-doped specimen, the longer the fiber the more excellent of its crack resistance, 30mm basalt fiber mortar improves the cracking performance by 99.1%; for the mixed-doped specimen, with the similar length of polypropylene fibers and basalt fiber mixed in have the optimal performance,the cracking performance improves 99.5%; With mixed fiber types (three kinds of fiber mixed-doped) increasing, although the specimen crack resistance decreased, but still increase the rate of 75.6% in the cracking performance.

Fracture Property of Mass Concrete with Inclusion of Fibers

2010 ◽  
Vol 156-157 ◽  
pp. 534-539
Author(s):  
Hua Quan Yang ◽  
Xia Chen ◽  
Yun Dong
Keyword(s):  
Elastic Modulus ◽  
Flexural Strength ◽  
Crack Resistance ◽  
Physical Performance ◽  
Fracture Property ◽  
Steel Fiber ◽  
Polypropylene Fiber ◽  
Mass Concrete ◽  
Strength Capacity ◽  
Better Than

In order to obtain the effect of fibers on fractural property of mass concrete, it had investigated physical performance, elastic modulus and bending toughness of mass concrete with the presence of steel fiber and polypropylene fiber(PPF). Results showed that the inclusion of PPF caused a slight decrease in initial cracking strength, flexural strength and elastic modulus, yet resulted in small increase in equivalent flexural strength, capacity-carrying loading variation coefficient and toughness.The presence of steel fiber was of significance to increase initial-cracking strength, flexural strength and equivalent flexural strength, and produced a slight increase in elastic modulus and significant improvement in capacity-carrying variation coeffecient and flexural toughness. Overall, the inclusion of steel fiber is rated better than PPF in improving ductility and crack resistance of concrete.

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