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Development of porosity and autogenous shrinkage of early age concrete

Title: Development of porosity and autogenous shrinkage of early age concrete
Author(s): Yilmaz Akkaya, Maria Konsta-Gdoutos, Karthik Obla, Surendra P. Shah
Paper category : conference
Book title: International RILEM Symposium on Concrete Science and Engineering: A Tribute to Arnon Bentur
Editor(s): J. Weiss, K. Kovler, J. Marchand, and S. Mindess
Print-ISBN: None
e-ISBN: 2912143926
Publisher: RILEM Publications SARL
Publication year: 2004
Nb references: 20
Language: English

Abstract: Autogenous shrinkage is one of the major properties that develop during the early ages due to the hydration of cement and self-desiccation of the matrix. In this study, fly ash, silica fume and ultra fine fly ash are incorporated into the binder phase by replacing part of cement in order to evaluate the autogenous shrinkage development of the early age high performance concretes. The autogenous shrinkage of the two binary binder concretes and two ternary binder concretes are measured and compared. Thermogravimetry analysis (TGA) and Mercury Intrusion Porosimetry (MIP) tests are performed at early ages in order to evaluate the properties of the developing pore system and hydration process of the binary and ternary systems.
MIP and TGA results indicated that incorporation of fly ash and ultra fine fly ash decrease the autogenous shrinkage strains due to a reduced hydration rate and a tailored pore structure. The ternary binder concretes exhibited a well connected pore structure at early ages. Connectivity of the pore structure and a large size critical pore radius provided the transportation of free water in the system and reduced the autogenous shrinkage.

Online publication: 2004-03-25
Classification: Measuring W/C and Porosity
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143926.016

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