STRENGTHENING OF CONCRETE STRUCTURES USING UHPC

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F22%3A00362653" target="_blank" >RIV/68407700:21110/22:00362653 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21610/22:00362653

Výsledek na webu

<a href="https://www.fib-international.org/publications/fib-proceedings/6th-i-fib-i-international-congress-in-oslo,-norway-2022-proceedings-em-pdf-em-detail.html" target="_blank" >https://www.fib-international.org/publications/fib-proceedings/6th-i-fib-i-international-congress-in-oslo,-norway-2022-proceedings-em-pdf-em-detail.html</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

STRENGTHENING OF CONCRETE STRUCTURES USING UHPC

Popis výsledku v původním jazyce

UHPC (ultra-high performance concrete) is a material with very high mechanical properties, as well as with an excellent durability. It is very suitable for strengthening of existing structures. Additional layer of UHPC cast on the top of existing slabs or beams provides substantial increase of load carrying capacity and it can also provide a barrier against water. Such strengthening is very promising because of several reasons. 1. High strength of UHPC layer makes the strengthening very efficient. 2. Relatively thin layer of UHPC represents only a small additional load of an existing structure. 3. Excellent bond between UHPC and existing concrete makes it possible to omit mechanical connectors. 4. At bridges, the UHPC layer can substitute a waterproofing. Extensive experimental program was executed in co-operation of the University with the producer of ready-mixed concrete and with the contracting company. The different structural elements strengthened by the UHPC layer were tested in bending, shear, punching and compression. Old precast elements were used for strengthening, so that an interaction of old concrete and UHPC could be realistically modelled. Long-term tests were executed on strengthened slabs subjected to bending. Small models of concrete columns strengthened by jacketing with UHPC were subjected to short-term tests and to long-term tests. The long-term load of about 1000 kN was developed using special loading frames with springs. A self-compacting UHPC was modified for applications, where casting of the top layer in slope up to 8% is necessary. The experimental results including the bond tests were evaluated and the conclusions for design were drawn. The results of experimental works and conclusions applicable for the design are presented in the paper.

Název v anglickém jazyce

STRENGTHENING OF CONCRETE STRUCTURES USING UHPC

Popis výsledku anglicky

UHPC (ultra-high performance concrete) is a material with very high mechanical properties, as well as with an excellent durability. It is very suitable for strengthening of existing structures. Additional layer of UHPC cast on the top of existing slabs or beams provides substantial increase of load carrying capacity and it can also provide a barrier against water. Such strengthening is very promising because of several reasons. 1. High strength of UHPC layer makes the strengthening very efficient. 2. Relatively thin layer of UHPC represents only a small additional load of an existing structure. 3. Excellent bond between UHPC and existing concrete makes it possible to omit mechanical connectors. 4. At bridges, the UHPC layer can substitute a waterproofing. Extensive experimental program was executed in co-operation of the University with the producer of ready-mixed concrete and with the contracting company. The different structural elements strengthened by the UHPC layer were tested in bending, shear, punching and compression. Old precast elements were used for strengthening, so that an interaction of old concrete and UHPC could be realistically modelled. Long-term tests were executed on strengthened slabs subjected to bending. Small models of concrete columns strengthened by jacketing with UHPC were subjected to short-term tests and to long-term tests. The long-term load of about 1000 kN was developed using special loading frames with springs. A self-compacting UHPC was modified for applications, where casting of the top layer in slope up to 8% is necessary. The experimental results including the bond tests were evaluated and the conclusions for design were drawn. The results of experimental works and conclusions applicable for the design are presented in the paper.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/FV20472" target="_blank" >FV20472: Aplikace vysokohodnotných cementových kompozitů na rekonstrukce betonových staveb</a><br>

Návaznosti

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

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název statě ve sborníku

Concrete Innovation for Sustainability. Proceedings for the 6th fib International Congress

ISBN

978-2-940643-15-8

ISSN

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e-ISSN

2617-4820

Počet stran výsledku

10

Strana od-do

2248-2257

Název nakladatele

fib - fédération internationale du béton

Místo vydání

Lausanne

Místo konání akce

Oslo

Datum konání akce

12. 6. 2022

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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