Strength and elastic properties of cement based materials – contribution of university of Ljubljana to the RRT+ of cost action TU1404

Author(s): Martin Klun, Lucija Strmšek, Violeta Bokan Bosiljkov
Paper category: Proceedings
Book title: SynerCrete’18: Interdisciplinary Approaches for Cement-based Materials and Structural Concrete: Synergizing Expertise and Bridging Scales of Space and Time Vol. 1 & 2
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 55-60
Total Pages: 6
Language : English

Abstract: Research group at the University of Ljubljana carried out extensive test campaign in the framework of the Extended Round Robin Testing program (RRT+) of COST ACTION TU1404. In this paper the first phase test results are given and discussed. The tests were carried out on modified cement paste, ordinary mortar and modified ordinary mortar, at the ages of 24, 30, 36, 48, 72 hours and 7 and 28 days. Hardened properties were evaluated by destructive standard tests and by measurements of compressive and shear ultrasonic waves. The obtained results show big influence of high content of SP with retarding effect on the properties of the modified cement paste and modified ordinary mortar. The age of samples of 2 days was estimated as the time when the retarding effect of the SP stops to act. Formation of micro cracks, due to autogenous shrinkage of the cement paste in the modified compositions, was seen as the source of tensile strength decrease observed at specimens’ age of 7 days.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00