The propagation speed of multiple dynamic cracks in fiber-reinforced cement-based composites measured using DIC

Pan, Kaiming; Yu, Rena C.; Ruiz, Gonzalo; Zhang, Xiaoxin; Wu, Zhimin; Rosa, Ángel De La

doi:10.1016/j.cemconcomp.2021.104140

Cited by 26 publications

(9 citation statements)

References 60 publications

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“…Bending strength and toughness are the main performance indexes used to study the bending behavior of cement-based materials; however, these do not reflect the bending failure process of the material. Digital image correlation (DIC) is an optical technique that can obtain the full-field displacement of the specimens surface and is widely used for crack monitoring due to its simplicity and high resolution [ 30 , 31 , 32 ]. In this paper, the DIC technique was used to study the crack propagation process in prefabricated notched beams.…”

Section: Methodsmentioning

confidence: 99%

Bending and Crack Evolution Behaviors of Cemented Soil Reinforced with Surface Modified PVA Fiber

Liang¹,

2022

Materials

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To improve the flexural properties of cemented soils reinforced with fibers and avoid their brittle failure when subjected to complex loading conditions, a simple and cost-effective technique was explored to facilitate their application in retaining walls. In this study, how different fiber surface modifications, i.e., alkali treatment, acid treatment and silane coupling agent treatment, as well as different fiber contents, i.e., 0%, 0.25%, 0.5% and 1%, affect the bending properties of cemented soils was investigated by conducting three-point bending tests on notched beams. The digital image correlation (DIC) technology was used to examine the crack propagation process and the strain field distribution of cracks in specimens in the flexural tests. The results show that all fiber surface modifications increased peak strength and fracture energy, for example, the fracture energy of specimens AN1, AH1 and AK1 was increased by 180.4%, 121.5% and 155.4%, respectively, compared to PVA1. In addition, the crack tip strain, crack propagation rate and the initial crack width of the modified specimens were lower than those before modification. Lastly, scanning electron microscope (SEM) and mercury intrusion porosimetry tests were adopted to reveal the mechanism of bending performance in cemented soils reinforced by fiber surface modifications.

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Section: Methodsmentioning

confidence: 99%

Bending and Crack Evolution Behaviors of Cemented Soil Reinforced with Surface Modified PVA Fiber

Liang¹,

2022

Materials

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“…There is a rich literature that develops the method and the range of applications. How, is mentioned in several references, such as [20][21][22]. Video Image Correlation (VIC) has proven to be an excellent method for analyzing the deformations and stresses that occur in a structure.…”

Section: Methodsmentioning

confidence: 99%

“…Video Image Correlation (VIC) has proven to be an excellent method for analyzing the deformations and stresses that occur in a structure and there is a rich literature that develops the method and the range of applications [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Video Image Correlation-Based Method Used for the Study of the Torsional Vibrations of an Adder Gearbox

et al. 2021

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In this paper, a study of the vibrations that appear in the transmission shafts of an adder gearbox used for a heavy truck is made. The truck has two engines on only one chassis and the power offered by these engines is summated and transmitted to the truck or the working machine. This type of transmission is used for oil production installation for the army. During the transportation of the installation to the workplace, only one engine is running, after mounting installation, both engines are running. This paper studies the vibrations of the adder gearbox, a complex construction, subjected to multiple operating requirements. In this regard, the authors first performed accuracy (accuracy) tests of the VIC 3D system on an original experimental mini-stand. Measurements performed on a mini disc demonstrated the validity and accuracy of the method, even if the cameras used were not high resolution. The authors applied the same principle in the case of the adder box from the truck, obtaining useful results for those in the field. The experimental method uses the facilities of a contactless optical measurement method (VIC-3D), which provides a high-accuracy quantitative linear and angular vibration analysis. The VIC measurement method offers, based on a frontal viewing of the disk during the resonance phenomenon and by simple calculus on the monitored linear displacements, the corresponding angular amplitude.

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“…Multi-walled carbon nanotubes (MWCNTs) are the most commonly used in the field of cement-based materials. Generally, the diameter of single-walled carbon nanotubes is between 0.4–2 nm, and the diameter of multi-walled carbon nanotubes is 1.4–100 nm, and they have extremely high strength, toughness, and elastic modulus [ 8 ]. However, there are strong van der Waals forces between the tubes; therefore, carbon nanotubes are generally agglomerated.…”

Section: Introductionmentioning

confidence: 99%

Study on the Properties of Multi-Walled Carbon Nanotubes (MWCNTs)/Polypropylene Fiber (PP Fiber) Cement-Based Materials

Niu,

Chen,

et al. 2023

Polymers

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In order to improve the mechanical properties and durability of cement-based materials, a certain amount of multi-walled carbon nanotubes (MWCNTs) and polypropylene fiber (PP fiber) were incorporated into cement-based materials. The mechanical properties of the multi-walled carbon nanotubes/polypropylene fiber cement-based materials were evaluated using flexural strength tests, compressive strength tests, and splitting tensile tests. The effects of multi-walled carbon nanotubes and polypropylene fiber on the durability of cement-based materials were studied using drying shrinkage tests and freeze–thaw cycle tests. The effects of the multi-walled carbon nanotubes and polypropylene fibers on the microstructure and pore structure of the cement-based materials were compared and analyzed using scanning electron microscopy and mercury intrusion tests. The results showed that the mechanical properties and durability of cement-based materials can be significantly improved when the content of multi-walled carbon nanotubes is 0.1–0.15%. The compressive strength can be increased by 9.5% and the mass loss rate is reduced by 27.9%. Polypropylene fiber has little effect on the compressive strength of the cement-based materials, but it significantly enhances the toughness of the cement-based materials. When its content is 0.2–0.3%, it has the best effect on improving the mechanical properties and durability of the cement-based materials. The flexural strength is increased by 19.1%, and the dry shrinkage rate and water loss rate are reduced by 14.3% and 16.1%, respectively. The three-dimensional network structure formed by the polypropylene fiber in the composite material plays a role in toughening and cracking resistance, but it has a certain negative impact on the pore structure of the composite material. The incorporation of multi-walled carbon nanotubes can improve the bonding performance of the polypropylene fiber and cement matrix, make up for the internal defects caused by the polypropylene fiber, and reduce the number of harmful holes and multiple harmful holes so that the cement-based composite material not only has a significant increase in toughness but also has a denser internal structure.

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The propagation speed of multiple dynamic cracks in fiber-reinforced cement-based composites measured using DIC

Cited by 26 publications

References 60 publications

Bending and Crack Evolution Behaviors of Cemented Soil Reinforced with Surface Modified PVA Fiber

Bending and Crack Evolution Behaviors of Cemented Soil Reinforced with Surface Modified PVA Fiber

Video Image Correlation-Based Method Used for the Study of the Torsional Vibrations of an Adder Gearbox

Study on the Properties of Multi-Walled Carbon Nanotubes (MWCNTs)/Polypropylene Fiber (PP Fiber) Cement-Based Materials

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