AN EXPERIMENT-BASED FE APPROACH TO ANALYZE EARLY- AGE TEMPERATURE AND STRAIN DISTRIBUTION IN LARGE- DIMENSION CONCRETE WALL

Author(s): Yan Geng (1), Suduo Xue (1), Xiongyan Li (1), Jinguang Li (2)
Paper category: Proceedings
Book title: SynerCrete’18 International Conference on Interdisciplinary Approaches for Cement-based Materials and Structural Concrete
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: 647-652
Total Pages: 6
Language : English

Abstract: Hydration heat and thermal cracking is a main concern for large-dimension concrete structures. In order to investigate the early-age properties of concrete under research, a set of time-varying experiments were conducted, namely the hydration experiment, standard thermal and mechanical tests. Then a finite-element (FE) method based on the material
experiments was proposed with User Subroutine UMATHT, USDFLD and UEXPAN. In order to verify the accuracy of the proposed FE method and investigate the temperature distribution and strain development of large-dimension concrete structures, an experimental wall of 3.6m×0.8m×3.6m in dimension was constructed. According to the temperature
measurement, the highest temperature reached a maximum of 52.3! at the central point after 36 hours of pouring. The maximum temperature difference between the core and ambient environment was 41.5!, with a maximum cooling rate of 9.0! per day. Compared with the FE analysis results, the average temperature difference at the peak was only 3.6%. As for the strain results, the computed curves reflected the trend of measured strain development with a maximum difference of 9.5% despite some local deviations. Overall, the computed result agreed well with test data, indicating the effectiveness of the proposed FE approach.

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