EARLY AGE CREEP AND RELAXATION MODELLING OF CONCRETE UNDER TENSION AND COMPRESSION

Author(s): B. Delsaute and S. Staquet
Book Title: RILEM International Symposium on Concrete Modelling - CONMOD 2014
Editor: Kefei Li, Peiyu Yan and Rongwei Yang
ISBN: 978-2-35158-139-1
e-ISBN: 978-2-35158-140-7
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 168-175
Total Pages: 8
Language: English

Abstract: In case of special concrete structures (tanks, nuclear containers, dams…), cracking may occur at early age. Thermal and autogenous strains can be restraint by boundary conditions. If the magnitude of the stresses induced in concrete is too high, cracks appear at early age. At this stage, creep plays an important role in the determination of the effective stress. It is therefore important to consider the creep at early age for the design of concrete structures with restraint deformation. However, it is still difficult to assess creep at early age in concrete, especially in tension. The purpose of this paper is to present a new experimental and modelling methodology to determine the creep and relaxation function in tension and compression by means of one cyclic test with a low duration of loading (5 min) and one test with duration of loading of 7 days. Experimental results are used to develop a new model which considers the aging of the concrete. This model is based on experimental observations and used 3 Kelvin-Voigt chains in series. For the sake of the study, an ordinary concrete has been used at a constant temperature (20°C) and in sealed conditions.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00