Flexural and toughness properties of NiTi shape memory alloy, polypropylene and steel fibres in self-compacting concrete

Aslani, Farhad; Liu, Yinong; Wang, Yu

doi:10.1177/1045389x19880613

Cited by 18 publications

(8 citation statements)

References 27 publications

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“…When the volume fraction of fiber was greater than 0.5%, the slump values were significantly reduced by more than 64.7% compared with those of ordinary FRAC, which might be due to the fact that the addition of fiber consumed extra water and cement paste to cover the surface of the fiber during the mixing process, increasing the roughness of the mixture and thus reducing the fluidity of the mixture [ 32 ]. Furthermore, compared with PF, the incorporation of SF could improve the adhesion between different materials of the paste and hinder the flow of the mixture, leading to a decrease in the slump value of FRAC [ 33 ]. Therefore, it is recommended to consider the influence of total fiber volume fraction on the slump value in the calculation of the unit water consumption of a concrete mixture to ensure the actual workability of FRAC.…”

Section: Test Results and Discussionmentioning

confidence: 99%

Mechanical Properties of Fully Recycled Aggregate Concrete Reinforced with Steel Fiber and Polypropylene Fiber

Zhang,

Li,

et al. 2024

Materials

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The study and utilization of fully recycled aggregate concrete (FRAC), in which coarse and fine aggregates are completely replaced by recycled aggregates, are of great significance in improving the recycling rate of construction waste, reducing the carbon emission of construction materials, and alleviating the ecological degradation problems currently faced. In this paper, investigations were carried out to study the effects of steel fiber (0.5%, 1.0%, and 1.5%) and polypropylene fiber (0.9 kg/m3, 1.2 kg/m3 and 1.5 kg/m3) on the properties of FRAC, including compressive strength, splitting tensile strength, the splitting tensile load–displacement curve, the tensile toughness index, flexural strength, the load–deflection curve, and the flexural toughness index. The results show that the compressive strength, splitting tensile strength, and flexural strength of fiber-reinforced FRAC were remarkably enhanced compared with those of ordinary FRAC, and the maximum increase was 56.9%, 113.3%, and 217.0%, respectively. Overall, the enhancement effect of hybrid steel–polypropylene fiber is more significant than single-mixed fiber. Moreover, the enhancement of the crack resistance, tensile toughness, and flexural toughness obtained by adding steel fiber to the FRAC is more significant than that obtained by adding polypropylene fiber. Furthermore, adding polypropylene fiber alone and mixing it with steel fiber showed different FRAC splitting tensile and flexural properties.

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Section: Test Results and Discussionmentioning

confidence: 99%

Mechanical Properties of Fully Recycled Aggregate Concrete Reinforced with Steel Fiber and Polypropylene Fiber

Zhang,

Li,

et al. 2024

Materials

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“…Therefore, scholars have improved the flexural properties of concrete from different angles by mixing in other materials or fibres such as nanosilica and steel fibre mixtures [30], rubber powder and steel fibre mixtures [31], silicon powder (SF) and ground granulated blast furnace slag (GGBS) [32], alkali-activated slag-fly ash [33], and rice husk ash [34]. Fruitful research results have been achieved on steel fibre-polypropylene fibre mixing [35]; modified olefin fibre (MOF) and steel fibre mixing [36]; steel fibre and polyethylene fibre mixing [37]; NiTi shape-memory alloy, polypropylene, and steel fibre mixing [38]; natural fibre (coconut shell fibre) and circular straight steel fibre mixing [39]; steel fibre and glass fibre mixing [40]; and different types of steel fibre mixing [41]. In addition, due to the large probability of defects such as pores, cracks, and local defects in large-sized specimens, the flexural properties of concrete are different.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Flexural Properties of Steel-Fibre-Reinforced Concrete Specimens with Different Heights

Yuan,

Ren,

Xie

2024

Sustainability

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Flexural strength is an important mechanical property of steel-fibre-reinforced concrete. By designing three-point bending tests of concrete with five specimen heights, three steel fibre types, and two steel fibre mixing methods, the effects of the specimen height, steel fibre mixing method, and steel fibre type on the peak load, effect of size, section characteristics, strain characteristics, and characteristics of the load–displacement curve of concrete specimens were studied. The results show that the peak load of the control group is basically linear with the height of the specimen. After adding three kinds of steel fibres, the peak load of the specimen is greater than that of the control group in the same case. The peak load of the specimen increases by adding three kinds of steel fibres, and the increase is closely related to the height of the specimen. The residual stage of the load–displacement curve of the milling steel fibre and the end hook steel fibre are relatively flat, while the residual stage of the load–displacement curve of the shear steel fibre is relatively large, and the residual load is also greater than the residual load of the shear steel fibre. The specimens in the control group show brittle failure characteristics. As the height of the specimens increases, the failed section of the specimens is smoother. The development of cracks in the steel fibre specimens is more tortuous than that of the control group, showing ductile failure characteristics. Some tensile failure zones are still present where the fibres are densely distributed, and the failure characteristics of the specimens are further explained and proven by the strain characteristics.

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“…SMA shows two different crystal phases: Martensite and austenite. Phase change can happen because of internal stresses or temperature changes [39][40][41]. Studies have been conducted to explore the application of nickel-titanium (NiTi)-SMA fibers to enhance the mechanical behavior of regular concrete structures [42,43].…”

Section: Introductionmentioning

confidence: 99%

Improving the Mechanical Properties of Concrete Mixtures by Shape Memory Alloy Fibers and Silica Fume

Xie,

Far,

Mortazavi

et al. 2024

Buildings

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Concrete, as one of the most widely applied materials in buildings, has high environmental impacts. Researchers are continually seeking solutions to mitigate these environmental issues while enhancing the mechanical strength and durability of concrete. However, there is a lack of studies on the effect of combining silica fume (SF) as pozzolanic materials and shape memory alloy (SMA) fibers on the mechanical properties of concrete. Moreover, there is very limited research on the influence of these materials on concrete mixtures after primary failure cracks using the secondary compressive strength test. In this research, 0.1, 0.2, and 0.3% SMA and 5, 7.5, and 10% SF were applied and then subjected to compressive strength, splitting tensile strength, flexural strength, secondary compressive strength, and ultrasonic pulse velocity tests. According to the results, 10% SF is more economical, which increases the compressive, splitting tensile, and flexural strength by 14%, 7%, and 10%, respectively. Also, using 0.3% SMA improves the compressive, splitting tensile, and flexural strength by 2%, 5%, and 8%, respectively. Furthermore, SMA has the ability to reduce the secondary compressive strength compared to other samples, indicating the quality of this material in controlling stress after cracking. Finally, it was indicated that the combined use of these two materials increases the strength parameters.

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Flexural and toughness properties of NiTi shape memory alloy, polypropylene and steel fibres in self-compacting concrete

Cited by 18 publications

References 27 publications

Mechanical Properties of Fully Recycled Aggregate Concrete Reinforced with Steel Fiber and Polypropylene Fiber

Mechanical Properties of Fully Recycled Aggregate Concrete Reinforced with Steel Fiber and Polypropylene Fiber

Experimental Study on the Flexural Properties of Steel-Fibre-Reinforced Concrete Specimens with Different Heights

Improving the Mechanical Properties of Concrete Mixtures by Shape Memory Alloy Fibers and Silica Fume

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