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Influence of water consumption and the content of addition of staple fibers in the volumetric changes of concretes used in floors

Author(s): J.A. de L. Senisse, D.C.C. Dal Molin, A.L.R. Abitante
Paper category: Conference
Book title: 8th RILEM International Symposium on Fiber Reinforced Concrete: challenges and opportunities (BEFIB 2012)
Editor(s): Joaquim A.O. Barros
Print ISBN: 978-2-35158-132-2
e-ISBN: 978-2-35158-133-9
Publisher: RILEM Publications SARL
Pages: 749 - 759
Total Pages: 10
Language: English

Shrinkage of concrete is most often the main origin of crack formation. The shrinkage occurs from volumetric changes present in the cement paste matrix as a result of the process of hydration and drying of cementitious composites. The presence of cracking due to the phenomenon of drying shrinkage is extremely worrying within elements such as concrete floors. Therefore, this paper investigates the mechanical properties, using the tests of compressive strength and flexural tensile strength as well as the dimensional deformation, through unrestrained and restrained drying shrinkage of concretes with different characteristics. The proportioning of mixtures was differentiated as to what concerns water consumption (175l/m³, 190l/m³ and 205l/m³) as well as the content of the addition of polypropylene microfibers (staple) of polypropylene (0g/m³, 300g/m³, 450g/m³, 600g/m³ and 900g/m³). According to the results of the study, the content of addition of polypropylene microfibers changed the consistency of fresh concrete. The level of water consumption influenced significantly on the results of mechanical properties as well as unrestrained and restrained drying shrinkage. In addition, the results indicated that, first, the incorrect dispersion of microfibers decreased the levels of strength (compressive and flexural tensile), second, the intensity of unrestrained drying shrinkage increased; finally, it influenced the tendency of cracking within the different types of concretes analysed.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00

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