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Author(s): Faez Sayahi, Mats Emborg, Hans Hedlund, Ingemar Löfgren
Paper category: Proceedings
Book title: proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference segment on Service Life of Cement-Based Materials and Structures
Editor(s): Miguel Azenha, Ivan Gabrijel, Dirk Schlicke, Terje Kanstad and Ole Mejlhede Jensen
e-ISBN: 978-2-35158-173-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 609-619
Total Pages: 11
Language : English

Abstract: Plastic shrinkage cracking, often the first type of cracks occurring even before initial setting,
causes enormous expenses for the building industry annually. The main reason behind the
phenomenon is believed to be rapid and excessive surface water evaporation of the concrete
element in the plastic stage which in turn leads to the so-called plastic or capillary shrinkage.
These cracks mainly occur in horizontal concrete elements with large surface to volume ratio
(such as slabs, pavements, etc.). This paper reports results from experiments performed, using
ring test method (NORDTEST-method NT Build 433). During the experiments, influence of
water-cement (w/c) ratio, cement type, coarse aggregate content and super plasticizer dosage
was investigated. Moreover, effort was made to explain the difference in cracking tendency of
different concretes based on water evaporation rate and capillary pressure. It seems that
various parameters have different influences on the cracking tendency, the evaporation rate,
as well as the hydration rate and capillary pressure. Although, capillary pressure is local and
its maximum value differs in different locations, it seems that its development rate, especially
in the first few hours, is almost identical everywhere in the specimen. This may be used as a
plastic shrinkage indicator.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00

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