Dynamic Properties of High Volume Fly Ash Nanosilica (HVFANS) Concrete Subjected to Combined Effect of High Strain Rate and Temperature

Mussa, Mohamed H.; Mutalib, Azrul A.; Hamid, Roszilah; Raman, Sudharshan Naidu

doi:10.1590/1679-78254900

Cited by 17 publications

(13 citation statements)

References 58 publications

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“…Strain rate sensitivity was defined for the concrete and rebar by using dynamic increase factor (DIF) curves, as shown in Figure 2. The DIF curve was obtained during a laboratory test conducted in UKM University on concrete with a compressive strength of 61.18 MPa via the split Hopkinson pressure bar (SHPB) impact test within a strain rate range of up to 103.87 s -1 [37] . For steel, the DIF of grade 60 rebar was determined by using Malvar's equation [38].…”

Section: Geometry Details and Meshingmentioning

confidence: 99%

Blast Damage Assessment of Symmetrical Box-Shaped Underground Tunnel According to Peak Particle Velocity (PPV) and Single Degree of Freedom (SDOF) Criteria

et al. 2018

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This study aimed to determine the reliability of the damage criteria that was adopted by the peak particle velocity (PPV) method and the single degree of freedom (SDOF) approach to assess the damage level of a box-shaped underground tunnel. An advanced arbitrary Lagrangian Eulerian (ALE) technique available in LS-DYNA software was used to simulate a symmetrical underground tunnel that was subjected to a surface detonation. The validation results of peak pressure into the soil revealed a good consistency with the TM5-855-1 manual within differences that were much less than previous numerical studies. The pressure contours revealed that the blast waves travelled into the soil in a hemispherical shape and the peak reflected the pressure of the tunnel that occurred immediately before the incident pressure reached its highest value. The assessment results proved that the criteria of the above methods could efficiently predict the damage level of a box-shaped tunnel under different circumstances of explosive charge weight and lining thickness at a depth of 4 m within slight differences that were observed during van and small delivery truck (SDT) explosions. However, the efficiency of both the methods was varied with the increase of burial depth. Whereas, using the PPV method significantly underestimated or overestimated the damage level of the tunnel, especially during SDT and container explosions with a lining thickness of 250 mm at burial depths of 6 and 8 m, respectively, the damage level that was obtained by the SDOF method greatly matched with the observed failure modes of the tunnel. Furthermore, new boundary conditions and equations were proposed for the damage criteria of the PVV method.

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Section: Geometry Details and Meshingmentioning

confidence: 99%

Blast Damage Assessment of Symmetrical Box-Shaped Underground Tunnel According to Peak Particle Velocity (PPV) and Single Degree of Freedom (SDOF) Criteria

et al. 2018

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“…Mussa et al [27] studied concrete dynamic and static properties using Ns and high-volume fly ash subjected to elevated temperatures of 400°C and 700°C for a fire duration of 2 hours. And found that at 700°C, both concrete mixtures showed a significant decrease in compressive strength; however, the concrete using Ns and high-volume fly ash showed a higher residual strength of 85.13%, compared to the control concrete.…”

Section: Literature Reviewmentioning

confidence: 99%

Behavior of concrete using alccofine and nano-silica under elevated temperature

Ashwini¹,

Rao²

2021

IJATEE

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Infrastructural development is multiplying worldwide, which has raised the demand for raw materials used in producing concrete [1]. Fine aggregates, coarse aggregates, and cement are used to make concrete. Cement acts as the glue that binds concrete together, but cement manufacturing causes significant environmental impact [2]. Extensive research is being done to create concrete to minimize this effect by finding an alternative to cement [2]. Supplementary cementitious materials (SCM) used entirely or partially as a substitute enhances concrete efficiency. Still, their reactivity is affected by factors such as chemical composition, surface area, shape, and size of the SCM, percentage replacement, and cement type [3]. Unique properties like high strength, compact morphology, reduced permeability, and enhanced durability are achieved using SCM to produce highperformance concrete [4].

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“…The voltage signals were converted into digital data that can be saved into a computer and analysed via MATLAB software by using a data logger (OMB-DAQ-3000). All the recorded pulses were used to calculate the stress ( ), strain rate (t), and strain ( ), respectively, according to the following equations [47,[52][53][54]: Quarterly connected strain gauges (SGD-3/350-LY11) were utilised to record the elongation of incident and transmitter bars during the test. These gauges were connected to bridge sensors model (OM2-163) to amplify the voltage change.…”

Section: Recorded Signals Of Dynamic Testmentioning

confidence: 99%

“…All the recorded pulses were used to calculate the stress σ(t), strain rate . ε(t), and strain ε(t), respectively, according to the following equations [47,[52][53][54]:…”

Section: Recorded Signals Of Dynamic Testmentioning

confidence: 99%

Late Age Dynamic Strength of High-Volume Fly Ash Concrete with Nano-Silica and Polypropylene Fibres

Mussa

Abdulhadi

Abbood³

et al. 2020

Crystals

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The dynamic behaviour of high-volume fly ash concrete with nano-silica (HVFANS) and polypropylene fibres at curing ages of 7 to 90 days was determined by using a split Hopkinson pressure bar (SHPB) machine. At each curing age, the concrete samples were laboratory tested at different temperatures conditions under strain rates reached up to 101.42 s−1. At room temperature, the results indicated that the dynamic compressive strength of plain concrete (PC) was slightly higher than HVFANS concrete at early curing ages of 7 and 28 days, however, a considerable improvement in the strength of HVFANS concrete was noted at a curing age of 90 days and recorded greater values than PC owing to the increase of fly ash reactivity. At elevated temperatures, the HVFANS concrete revealed a superior behaviour than PC even at early ages in terms of dynamic compressive strength, critical strain, damage and toughness due to increase of nano-silica (NS) activity during the heating process. Furthermore, equations were suggested to estimate the dynamic increase factor (DIF) of both concretes under the investigated factors.

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Dynamic Properties of High Volume Fly Ash Nanosilica (HVFANS) Concrete Subjected to Combined Effect of High Strain Rate and Temperature

Cited by 17 publications

References 58 publications

Blast Damage Assessment of Symmetrical Box-Shaped Underground Tunnel According to Peak Particle Velocity (PPV) and Single Degree of Freedom (SDOF) Criteria

Blast Damage Assessment of Symmetrical Box-Shaped Underground Tunnel According to Peak Particle Velocity (PPV) and Single Degree of Freedom (SDOF) Criteria

Behavior of concrete using alccofine and nano-silica under elevated temperature

Late Age Dynamic Strength of High-Volume Fly Ash Concrete with Nano-Silica and Polypropylene Fibres

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