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Determination and modelling of bond properties of synthetic macro-fibres in concrete

Abstract

Bond behaviour of a synthetic macro-fibre in concrete is the object of this research. The bond strength and stiffness are the parameters characterising the bonding mechanism that determines the efficiency of the reinforcing material. However, there is no general methodology developed to evaluate fibre efficiency. There also exists neither a straightforward procedure to estimate the bond quality of a synthetic macro-fibre nor a reliable numerical model to simulate the bond behaviour of such fibres. In this work, the bond mechanisms of 40 mm long synthetic macro-fibres are investigated using pull-out tests: 16 concrete cubes were made for that purpose. One type of synthetic macro-fibre available at the market is considered. In each test sample, three fibres were inserted perpendicular to the top and two side surfaces; two bonding lengths (10 mm and 20 mm) were used. A gripping system was developed to protect the fibres from local damage. A physically non-linear finite element model of the pull-out sample was developed. A bond model was proposed to simulate deformation behaviour of the fibres.


Article in English.


Betono ir sintetinio makroplaušo sukibties savybių nustatymas ir modeliavimas


Santrauka


Šio tyrimo objektas – sintetinio makroplaušo sukibties elgsena betone. Sukibties stiprumas ir standumas yra parametrai, apibūdinantys sukibties mechanizmą, kuris lemia armatūrinės medžiagos efektyvumą. Tačiau nėra bendros metodikos, kuria būtų galima įvertinti plaušo efektyvumą. Taip pat nėra nei paprasčiausios sintetinio makroplaušo sukibties kokybės įvertinimo procedūros, nei patikimo skaitmeninio modelio, kuris imituotų tokių plaušų sukibties elgesį. Šiame darbe 40 mm ilgio sintetinių makroplaušų sukibties mechanizmai tiriami atliekant ištraukimo bandymus. Tam buvo pagaminta 16 betono kubelių. Išbandoma viena iš rinkoje esančių sintetinių makroplaušų rūšių. Kiekviename bandinyje trys plaušai buvo įgilinami statmenai viršutiniam ir dviem šoniniams paviršiams. Buvo naudojami du įgilinimo ilgiai (10 mm ir 20 mm). Sukurta įtvirtinimo sistema, apsauganti plaušus nuo vietinių pažeidimų. Buvo sukurtas fiziškai netiesinis iš betono ištraukiamų plaušų baigtinių elementų modelis, pasiūlytas sukibties modelis, siekiant imituoti plaušų elgseną deformuojantis.


Reikšminiai žodžiai: sintetiniai plaušai, ištraukimas, bandymas, sukibties elgsena, skaitmeninis modeliavimas.

Keyword : synthetic fibres, pull out, test, bond behaviour, numerical modelling

How to Cite
Garnevičius, M., Plioplys, L., & Gribniak, V. (2021). Determination and modelling of bond properties of synthetic macro-fibres in concrete. Mokslas – Lietuvos Ateitis / Science – Future of Lithuania, 13. https://doi.org/10.3846/mla.2021.12807
Published in Issue
Jan 6, 2021
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This work is licensed under a Creative Commons Attribution 4.0 International License.

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