Dynamic Bending Test with in-Situ X-Ray Radiography for Investigation of Ultra High Performance Concrete Reinforced by Steel Fibers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21260%2F24%3A00379344" target="_blank" >RIV/68407700:21260/24:00379344 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21610/24:00379344

Výsledek na webu

<a href="https://doi.org/10.1007/978-3-031-70145-0_69" target="_blank" >https://doi.org/10.1007/978-3-031-70145-0_69</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/978-3-031-70145-0_69" target="_blank" >10.1007/978-3-031-70145-0_69</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dynamic Bending Test with in-Situ X-Ray Radiography for Investigation of Ultra High Performance Concrete Reinforced by Steel Fibers

Popis výsledku v původním jazyce

he Ultra high-performance steel fibres reinforced concrete (UHPFRC) investigated in this paper is a fine-grained cement-based composite material with outstanding mechanical properties. Its key attributes include an ultra-high compressive strength in excess 150 MPa and a permanent post-cracking strength in excess 5 MPa. To increase its structural integrity, steel fibres 13 mm long and 0.2 mm in diameter are added to the matrix to reinforce it. In order to assess the properties of the UHPFRC under varying loading conditions, the prism-shaped specimens are subjected to three-point bending tests over a range of loading rates from quasi-static regime to dynamic impacts at intermediate strain rates. The experiments are performed using an in-house developed testing machine based on linear motors and are conducted at 4 different loading velocities with at least 5 specimens tested at each strain rate. The tests are observed using a high-speed camera. For a better understanding of the material behaviour, the testing equipment is combined with a laboratory high power X-ray imaging set-up that allows internal inspection of the samples to analyze the effect of imperfections, inhomogeneities, voids and dominant fibre orientation. X-ray imaging is performed before and after mechanical testing and also in-situ during the loading using a high-speed X-ray imaging camera. A significant dynamic increase factor is observed between the individual strain rates, while the dominant fibre orientation is identified as a crucial aspect causing the differences between the specimens. This innovative experimental approach provides invaluable insights into the material response to dynamic loading conditions and offers a comprehensive understanding that is crucial for optimizing its performance in a variety of real-world applications.

Název v anglickém jazyce

Dynamic Bending Test with in-Situ X-Ray Radiography for Investigation of Ultra High Performance Concrete Reinforced by Steel Fibers

Popis výsledku anglicky

he Ultra high-performance steel fibres reinforced concrete (UHPFRC) investigated in this paper is a fine-grained cement-based composite material with outstanding mechanical properties. Its key attributes include an ultra-high compressive strength in excess 150 MPa and a permanent post-cracking strength in excess 5 MPa. To increase its structural integrity, steel fibres 13 mm long and 0.2 mm in diameter are added to the matrix to reinforce it. In order to assess the properties of the UHPFRC under varying loading conditions, the prism-shaped specimens are subjected to three-point bending tests over a range of loading rates from quasi-static regime to dynamic impacts at intermediate strain rates. The experiments are performed using an in-house developed testing machine based on linear motors and are conducted at 4 different loading velocities with at least 5 specimens tested at each strain rate. The tests are observed using a high-speed camera. For a better understanding of the material behaviour, the testing equipment is combined with a laboratory high power X-ray imaging set-up that allows internal inspection of the samples to analyze the effect of imperfections, inhomogeneities, voids and dominant fibre orientation. X-ray imaging is performed before and after mechanical testing and also in-situ during the loading using a high-speed X-ray imaging camera. A significant dynamic increase factor is observed between the individual strain rates, while the dominant fibre orientation is identified as a crucial aspect causing the differences between the specimens. This innovative experimental approach provides invaluable insights into the material response to dynamic loading conditions and offers a comprehensive understanding that is crucial for optimizing its performance in a variety of real-world applications.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

<a href="/cs/project/GM22-18033M" target="_blank" >GM22-18033M: Dynamika rázů s využitím rychlé rentgenové radiografie a zábleskového rentgenového zdroje</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Transforming Construction: Advances in Fiber Reinforced Concrete

ISBN

978-3-031-70144-3

ISSN

2211-0844

e-ISSN

2211-0852

Počet stran výsledku

8

Strana od-do

573-580

Název nakladatele

Springer Nature

Místo vydání

—

Místo konání akce

Drážďany

Datum konání akce

15. 9. 2024

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

001333028600069