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Author(s): Markus Krüger, Rok Bregar, Gheorghe Alexandru David, Joachim Juhart
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: 503-512
Total Pages: 10
Language : English

Abstract: Ultrasonic methods have been developed in the past to study properties of cement based
materials in the fresh and hardening state. However, most of the methods only consider a
certain type of ultrasonic waves. To derive elastic parameters of fresh concrete like the
Poisson’s ratio and elastic modules it is required to obtain shear waves as well as
compressional waves. It is certainly much more difficult to establish a setup to transmit and
record shear waves in a way that the onset of these slower waves (compared to compressional
waves) can be detected as clear as necessary to calculate shear wave velocity values with the
required accuracy. A test setup for testing cement paste with different ultrasonic waves is
presented. Tests have been conducted that show reasonable ultrasonic compressional and
shear wave transmission right after mixing. Thus ultrasound is found to be suited for the
characterisation of paste mixtures and the determination of changes in the rheological
properties already before setting. Test results from different cementitious mixes with a special
focus on eco-pastes are presented. These eco-pastes show optimized packing density (using
micro and eco fillers as replacement of Portland cement clinker).

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

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