Mechanical and durability properties of high-strength concrete containing steel and polypropylene fibers

Afroughsabet, Vahid; Ozbakkaloglu, Togay

doi:10.1016/j.conbuildmat.2015.06.051

Cited by 687 publications

(321 citation statements)

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“…Moreover, polypropylene has a hydrophobic surface-it does not absorb water nor it does interfere in the concrete hydration reaction [13]. Nonetheless, owing to drying shrinkage in hardened concrete, cracks generally develop over time which weaken the waterproofing capabilities and expose the concrete microstructure to destructive substances [14][15][16]. Therefore, a chief aim in concrete science is to enhance the properties of hardened concrete [17].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a chief aim in concrete science is to enhance the properties of hardened concrete [17]. Factors, such as the fiber-matrix properties, fiber geometry, volume of fiber inclusion, type of fiber, and fiber orientation in the concrete mixture, determine fiber efficiency [14,[18][19][20]. Hence, applying different fibers of various lengths and qualities is a useful method to resolve the issue of cracks of assorted sizes appearing at various stages of concrete structure exploitation.…”

Section: Introductionmentioning

confidence: 99%

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Property Assessment of Hybrid Fiber-Reinforced Ultra-High-Performance Concrete

Smarzewski

Barnat-Hunek

2017

Int J Civ Eng

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early 1990s [1]. UHPC is characterized by a compressive strength above 120 MPa and high durability [2]. At present, some limitations remain regarding the use of standard concrete, such as its low tensile strength and ductility; however, it is possible that ultra-high-performance concrete reinforced with hybrid fibers can overcome these limitations. The main advantages of the UHPC mixture are: low values of water/binder ratio, the elimination of coarse aggregate, namely, the use of only fine aggregate, a limited amount of fine aggregate, and a packing density in which the grains fill the voids [3]. Besides utilizing a water-reducing agent, an addition of silica fume in UHPC mixtures is recommended to improve the workability [1,4] as silica fume has a diameter small enough to fill the interstitial voids between the cement and quartz sand particles. What is more, to reduce labor costs and provide architects and designers greater architectural freedom in structural member shapes and forms, it is advisable to either to reduce or completely eliminate the implementation of steel reinforcement bars. Nonetheless, the drawbacks of UHPC are that, on the whole, it is expensive and cannot substitute standard concrete in the majority of applications [5]. It is due to the composition of its mixtures that make the UHPC microstructure different from ordinary concrete. For UHPC at W/C = 0.20, its capillary pores become discontinuous when only 26% of the cement has been hydrated, instead of 54% for HPC, where W/C = 0.33 [1,6]. The pore size of UHPC basically varies between 2 and 3 nm, and its total porosity is 2.23% [1]. Studies on UHPC have been carried out by several researchers; nevertheless, the information on UHPC materials and structural properties is still rather lacking. A great deal of this research has revealed that a combination of steel-polypropylene fibers in concrete could take advantage of the material properties of both the fibers to Abstract The purpose of this study was to determine the effect of steel/polypropylene hybrid fibers on the mechanical properties and microstructure of ultra-highperformance concrete (UHPC). Tests were carried out on UHPC without and with fibers (steel and/or polypropylene in amounts of 0.25-1%). In this study, granite or granodiorite coarse aggregate with a grain size of about 2/8 mm was employed. The three-point bending tests displayed prolonged post-peak softening behavior. In addition, increasing the content of polypropylene fibers reduced the fracture energy. Moreover, the SEM results illustrated that adding a certain amount of fibers to concrete considerably changes the microstructure. It was observed that the smallest microcracks in the interfacial transition zone between the paste and aggregate occurred in the concrete containing steel fibers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Property Assessment of Hybrid Fiber-Reinforced Ultra-High-Performance Concrete

Smarzewski

Barnat-Hunek

2017

Int J Civ Eng

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“…Concrete deterioration is associated with destructive chemical attacks and the impact of freezing and thawing (Chemrouk 2015;Bondar et al 2015). Another factor that affects concrete durability is resistance to the ingress of aggressive ions (Afroughsabet and Ozbakkaloglu 2015). The most frequent sulphate salts are calcium sulphate (Ca 2 SO 4 ), sodium sulphate (Na 2 SO 4 ), potassium sulphate (K 2 SO 4 ) and magnesium sulphate (MgSO 4 ), the most aggressive salts of which are sodium sulphate and potassium sulphate (Chemrouk 2015).…”

Section: Introductionmentioning

confidence: 99%

Effect of Fiber Hybridization on Durability Related Properties of Ultra-High Performance Concrete

Smarzewski

Barnat-Hunek

2017

Int J Concr Struct Mater

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The purpose of the paper is to determine the influence of two widely used steel fibers and polypropylene fibers on the sulphate crystallization resistance, freeze-thaw resistance and surface wettability of ultra-high performance concrete (UHPC). Tests were carried out on cubes and cylinders of plain UHPC and fiber reinforced UHPC with varying contents ranging from 0.25 to 1% steel fibers and/or polypropylene fibers. Extensive data from the salt resistance test, frost resistance test, dynamic modulus of elasticity test before and after freezing-thawing, as well as the contact angle test were recorded and analyzed. Fiber hybridization relatively increased the resistance to salt crystallization and freeze-thaw resistance of UHPC in comparison with a single type of fiber in UHPC at the same fiber volume fraction. The experimental results indicate that hybrid fibers can significantly improve the adhesion properties and reduce the wettability of the UHPC surface.

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“…The increase in the fiber content of both polyproplene fibers and steel fibers in fiber-reinforced concretes improves mechanical properties of the concrete [5]. In this study the polypropylene fiber-reinforced concrete and concrete without fiber (Y0) were produced by adding different amounts of polypropylene fibers (1 kg/m 3 (PP1), 3 kg/m 3 (PP3) and 5 kg/m 3 (PP5)) to dry mix shotcrete.…”

Section: Methodsmentioning

confidence: 99%

Investigation of Radiation Shielding Properties of Polypropylene Fiber Reinforced Shotcrete

Çakiroğlu

2016

Acta Phys. Pol. A

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Fibre concrete has emerged in order to improve the properties of concrete and to create an economical building material. In this study, the radiation permeability of shotcrete reinforced with polypropylene fiber was investigated. For this purpose, linear attenuation coefficient was measured for shotcrete reinforced with polypropylene fiber, produced using the dry mixing process. The linear attenuation coefficients for dry mixed shotcrete have been measured at photon energies of 1173, 1332 and 662 keV. Measurements were carried out using gamma spectrometer containing NaI (Tl) detector and a Multichannel Analyzer (MCA). The linear attenuation coefficients have increased with the increasing fiber percentage for all studied gamma energies.

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Mechanical and durability properties of high-strength concrete containing steel and polypropylene fibers

Cited by 687 publications

References 43 publications

Property Assessment of Hybrid Fiber-Reinforced Ultra-High-Performance Concrete

Property Assessment of Hybrid Fiber-Reinforced Ultra-High-Performance Concrete

Effect of Fiber Hybridization on Durability Related Properties of Ultra-High Performance Concrete

Investigation of Radiation Shielding Properties of Polypropylene Fiber Reinforced Shotcrete

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