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PLASTIC SHRINKAGE CRAKING IN SELF-COMPACTING CONCRETE:: A PARAMETRIC STUDY
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
Chalmers University of Technology.
Number of Authors: 4
2016 (English)In: International RILEM conference on Materials, Systems and Structures in Civil Engineering 2016 (MSSCE 2016): Service Life of Cement-Based Materials and Structures / [ed] Miguel Azenha; Ivan Gabrijel; Dirk Schlicke; Terje Kanstad; Ole Mejhede Jensen, Paris, France: Rilem publications, 2016, Vol. 2, 609-619 p.Conference paper (Refereed)
Abstract [en]

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.

Place, publisher, year, edition, pages
Paris, France: Rilem publications, 2016. Vol. 2, 609-619 p.
Keyword [en]
Plastic Shrinkage, Cracking, Evaporation, Capillary pressure, Dormant period, NORDTEST-method NT Build 433, Materials science - Construction materials
Keyword [sv]
Teknisk materialvetenskap - Konstruktionsmaterial
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-35371Local ID: 9e2dae36-20fb-4d92-9733-2793d99619a6ISBN: 978-2-35158-171-4ISBN: 978-2-35158-173-5 (PDF)OAI: oai:DiVA.org:ltu-35371DiVA: diva2:1008624
Conference
MSSCE2016 : RILEM 22/08/2016
Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2016-11-10Bibliographically approved

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