Crack propagation speed in ultra high performance concrete (UHPC)

Pyo, Sukhoon; Alkaysi, Mo; El‐Tawil, Sherif

doi:10.1016/j.conbuildmat.2016.03.148

Cited by 61 publications

(27 citation statements)

References 34 publications

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“…The major concern is that the cable may be broken by the tensile force induced by open crack of concrete. According to Pyo and El-Tawil (2013) and Pyo et al (2016), the crack propagation velocity of concrete increases with increasing strain rate. Its value is from tens of meters per second to about one thousand meters per second with strain rate increasing from 10 −4 /s to 10 3 /s.…”

Section: Grid-net Measuring Systemmentioning

confidence: 99%

A grid-net method to study the dynamic responses of steel-reinforced concrete target and projectile

Chen

et al. 2017

International Journal of Protective Structures

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In order to study the dynamic responses of a high-speed projectile striking into the steel-reinforced concrete target, a grid-net method has been developed in this article. The measuring system is composed of the grid nets fabricated by fine cables, light-emitting diode lamps, power supply systems, high-speed photography, and so on. Each grid net was pre-embedded along the rebar net. Multilayers of the grid nets were distributed with given space. The light-emitting diode lamp turns down when the cable is cut off. The status of the lamps is recorded by the high-speed photography. The basic idea is to trace the projectile by the on-off states of light-emitting diode lamps. In association with the high-speed photograph, the variation of the projectile velocity and the final depth of penetration could also be obtained. The depth of penetration value given by the grid measurement method was validated by the experimental result and the prediction of empirical formula and they show good agreement with each other.

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Section: Grid-net Measuring Systemmentioning

confidence: 99%

A grid-net method to study the dynamic responses of steel-reinforced concrete target and projectile

Chen

et al. 2017

International Journal of Protective Structures

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“…Cement-based materials without coarse aggregate were chosen in this research to systematically investigate the effects of various forms of silica-based materials on the laser cutting quality. It should be noted that UHPC is one of the most advanced cement-based materials, and active research has been carried out to explore its material characteristics [15][16][17][18]. A multimode fiber laser is used for the experiment.…”

Section: Introductionmentioning

confidence: 99%

High-Power Fiber Laser Cutting for 50-mm-Thick Cement-Based Materials

2020

Self Cite

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This experimental research highlights the applicability of laser cutting to cement-based materials using multimode fiber lasers. A 9 kW multimode fiber laser is used, and the experimental variables are the water-to-cement ratio, laser speed, and material compositions such as cement paste, cement mortar and ultra high performance concrete (UHPC). The laser cutting performance on the cement-based materials is investigated in the downward laser direction. The kerf width and penetration depth of the cement-based materials are quantitatively evaluated with the parameters in the surface and cross section of the specimens after the laser cutting. Moreover, the material removal zone of each specimen is compared in terms of the penetration shapes in the cross-sectional view. Based on experimental observations, the interaction mechanism between the laser and cement-based materials is proposed.

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“…HPC and HSC), the innovations including the exclusion of coarse grains, addition of active fly ash and fibers as well as curing under special pressure and high temperature, are applied. Great strength and rupture capacity together with considerable durability are regarded as particular characteristics of the RPC (Pyo et al, 2016;Su et al, 2016;Zheng et al, 2012Zheng et al, , 2015.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on the performance of fine-grained concrete incorporating recycled steel spring exposed to acidic conditions

Pachideh

Gholhaki

2020

Advances in Structural Engineering

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This article aims to study the effects of adding steel fibers and galvanized recycled spring on mechanical properties and crack development in the fine-grained concrete exposed to the acidic environment containing magnesium sulfate. To this end, specimens containing 0.3% and 0.6% of steel fibers and springs, respectively, by concrete volume, were built in normal temperature using 10 cm × 20 cm standard steel formworks so as to conduct the compressive and tensile strength tests. All specimens were cured in 28 days exposed to the environment containing 0%, 5%, and 10% of magnesium sulfate. Based on the results, addition of steel fibers and recycled spring improves the compressive and tensile strength by 50% and 60%, respectively. Moreover, the specimens containing recycled spring better withstood against the acidic environments in comparison with the specimens including steel fibers. In general, it was found that due to the negligible difference between the strength of the specimens, the application of metal-recycled spring in the fine-grained concrete is technically and economically justifiable.

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Crack propagation speed in ultra high performance concrete (UHPC)

Cited by 61 publications

References 34 publications

A grid-net method to study the dynamic responses of steel-reinforced concrete target and projectile

A grid-net method to study the dynamic responses of steel-reinforced concrete target and projectile

High-Power Fiber Laser Cutting for 50-mm-Thick Cement-Based Materials

An experimental study on the performance of fine-grained concrete incorporating recycled steel spring exposed to acidic conditions

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