CRACK FORMATION RISK REDUCTION OF HPC/HSC BY SUITABLE CHOICE OF THE PLASTICIZER

Kód výsledku v IS VaVaI

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RIV/00216305:26110/03:PU38394

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

čeština

Název v původním jazyce

CRACK FORMATION RISK REDUCTION OF HPC/HSC BY SUITABLE CHOICE OF THE PLASTICIZER

Popis výsledku v původním jazyce

Development of HPC/HSC is focused on properties improvement by porosity reduction. Low porosity means lower permeability and low permeability guarantee mechanical properties and better durability. At practical production of these types of concrete the aim of the mix designers is to lower W/C ratio, which could be primarily achieved by superplasticizers. Concrete with low W/C ratio - achieved by the use of super plasticizers - tend to early age cracking in higher rate. These cracks decrease final perforrmance of the concrete - mechanical properties, durability etc. One of the reasons of the early age crack formation and subsequent decrease of concrete performance is due to thermal expansivity. Thermal expansivity of HPC/HSC is higher then of other typesof concrete due to higher amount of binder (generally CEM I 42,5 R or 52,5R) with higher and faster hydration heat development. Reactive kinetics highly depends on additives. It is possible to remarkably influence the hydration kinetics

Název v anglickém jazyce

CRACK FORMATION RISK REDUCTION OF HPC/HSC BY SUITABLE CHOICE OF THE PLASTICIZER

Popis výsledku anglicky

Development of HPC/HSC is focused on properties improvement by porosity reduction. Low porosity means lower permeability and low permeability guarantee mechanical properties and better durability. At practical production of these types of concrete the aim of the mix designers is to lower W/C ratio, which could be primarily achieved by superplasticizers. Concrete with low W/C ratio - achieved by the use of super plasticizers - tend to early age cracking in higher rate. These cracks decrease final perforrmance of the concrete - mechanical properties, durability etc. One of the reasons of the early age crack formation and subsequent decrease of concrete performance is due to thermal expansivity. Thermal expansivity of HPC/HSC is higher then of other typesof concrete due to higher amount of binder (generally CEM I 42,5 R or 52,5R) with higher and faster hydration heat development. Reactive kinetics highly depends on additives. It is possible to remarkably influence the hydration kinetics

Druh

D - Stať ve sborníku

CEP obor

JN - Stavebnictví

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2003

Kód důvěrnosti údajů

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

Název statě ve sborníku

2. mezinárodní sympósium FC a HPC

ISBN

80-86604-08-X

ISSN

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e-ISSN

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Počet stran výsledku

10

Strana od-do

100-109

Název nakladatele

Skurkon

Místo vydání

Praha

Místo konání akce

Praha

Datum konání akce

22. 9. 2003

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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