Invetigation of Moisture Exchange and Shrinkage of Concrete with Different Water-Cement Ratio

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Invetigation of Moisture Exchange and Shrinkage of Concrete with Different Water-Cement Ratio

Popis výsledku v původním jazyce

The paper deals with characteristics of moisture transfer and shrinkage of concrete with respect to variable water-cement ratio and cement content. An experiment including four different concrete mixtures with water-cement ratio in the range 0,25-0,52 was conducted at the Faculty of Civil Engineering CTU in Prague in order to provide unique set of data containing measurements of moisture loss, pore relative humidity profiles, self-desiccation, drying shrinkage and autogenous shrinkage. Specimen types were chosen carefully with respect to quantities which were desired to be determined experimentally. Characteristic sizes of used specimens (cubes, cylinders, slabs) varied between 10 to 30 cm. Surfaces of these specimens not intended to dry were sealed with synthetic resin. Measurements were carried out for the period of 419 day in uncontrolled environment, where ambient temperature and relative humidity were recorded every 5 minutes by datalogger. Using the set of measured data, qualitative and quantitative relations were determined between: 1) moisture loss and drying shrinkage, 2) ultimate self-desiccation and water-cement ratio, 3) ultimate moisture loss and water-cement ratio, 4) parts of shrinkage (autogenous, drying, total) and water-cement ratio. Also, the dependencies of these quantities on cement content of individual mixtures are analysed as well. An explanation for recorded early-age swelling is stated considering hypothesis published recently in the literature.

Název v anglickém jazyce

Invetigation of Moisture Exchange and Shrinkage of Concrete with Different Water-Cement Ratio

Popis výsledku anglicky

The paper deals with characteristics of moisture transfer and shrinkage of concrete with respect to variable water-cement ratio and cement content. An experiment including four different concrete mixtures with water-cement ratio in the range 0,25-0,52 was conducted at the Faculty of Civil Engineering CTU in Prague in order to provide unique set of data containing measurements of moisture loss, pore relative humidity profiles, self-desiccation, drying shrinkage and autogenous shrinkage. Specimen types were chosen carefully with respect to quantities which were desired to be determined experimentally. Characteristic sizes of used specimens (cubes, cylinders, slabs) varied between 10 to 30 cm. Surfaces of these specimens not intended to dry were sealed with synthetic resin. Measurements were carried out for the period of 419 day in uncontrolled environment, where ambient temperature and relative humidity were recorded every 5 minutes by datalogger. Using the set of measured data, qualitative and quantitative relations were determined between: 1) moisture loss and drying shrinkage, 2) ultimate self-desiccation and water-cement ratio, 3) ultimate moisture loss and water-cement ratio, 4) parts of shrinkage (autogenous, drying, total) and water-cement ratio. Also, the dependencies of these quantities on cement content of individual mixtures are analysed as well. An explanation for recorded early-age swelling is stated considering hypothesis published recently in the literature.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

CONCRETE Innovations in Materials, Design and Structures - Proceedings of the fib Symposium 2019

ISBN

978-2-940643-00-4

ISSN

2617-4820

e-ISSN

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Počet stran výsledku

6

Strana od-do

401-406

Název nakladatele

Fédération Internationale du Béton

Místo vydání

Lausanne

Místo konání akce

Krakow

Datum konání akce

27. 5. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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