Background for a new Eurocode 2-annex: Evaluation of early-age and long-term cracking due to restrained deformations

Author(s): Terje Kanstad, Anja Klausen
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: 85-90
Total Pages: 6
Language : English

Abstract: It is agreed within the relevant CEN-committees that Eurocode 2 should give regulations that clearly describe how imposed deformations including early age effects can be accounted for in structural serviceability limit state design. This paper aims to give background for some of the proposed methods and text in a new annex including literature references, verifications and explanations of the applied methods and parameters. A new equation for development of mechanical properties is included as basis for stress calculation. It is accounting particularly for the time right after setting, and can also be applied for general reference ages between 28 and 91 days. A simplified approach based on the age adjusted effective E-modulus, which has been proven to work well also at early ages is included. It applies an effective E-modulus accounting both for aging and creep. The most recent draft of the annex considers the largest tensile stress for two particular stages, at temperature equilibrium at early ages, and at the design life. The crack strain is described, while the crack spacing is found in the main SLS- chapter as for ordinary loads, and thus the surface crack width may be calculated.

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