Numerical Simulation of Early Age Deformation and Cracking of RC Structures with Full-3D Multi-scale and Multi-physical Integrated Analysis
Author(s): Tetsuya Ishida, Naoya Ohno, Yasushi Tanaka and Ichiro Iwaki
Paper category: Proceedings
Book title: 3rd International RILEM Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): Changwen Miao, Wei Sun, Jiaping Liu, Huisu Chen, Guang Ye and Klaas van Breugel
Publisher: RILEM Publications SARL
Publication year: 2016
Total Pages : 10
Language : English
Abstract: Much of Japan’s infrastructures was constructed during the last half century, and parts of this infrastructure are undergoing severe deterioration due to environmental and loading actions. Among them, road structures in cold and snowy region are reported to show faster and severer deterioration than expected due to combined frost damage, chloride attack from de-icing agent, ASR, cracking, fatigue, and so on. For such structures, it is necessary to assure durability performance in design considering conceivable environmental and loading actions during service. In November 2011, the Japanese government resolved to build “reconstruction roads” in the Tohoku region to accelerate recovery from the Great East Japan Earthquake of March 2011. Since the Tohoku region experiences cold and snowy weather in winter, complex degradation involving multiple factors such as those mentioned above is anticipated. Thus, in order to enhance the durability performance of road structures, more particularly RC slab decks, the authors propose multiple countermeasures: low water-to-cement ratio in the mix, use of mineral admixtures such as blast furnace slag and/or fly ash to mitigate the risks of chloride attack and ASR, anti-corrosion rebar, and 6% entrained air for frost damage. It should be noted here that such a high-durability specification may conversely increase the risk of early age cracking caused by temperature and shrinkage due to the large amount of cement and use of the mineral admixtures.
Against this background, this paper presents numerical simulation of early age deformation and cracking of RC structures with full 3D multi-scale and multi-physical integrated analysis.
First, a multi-scale constitutive model of solidifying cementitious materials is briefly introduced based on systematic knowledge coupling microscopic thermodynamic phenomena and microscopic structural mechanics. Then, model validations are done by applying the multi-scale and multi-physical integrated analysis system to the early-age behavior of small sized specimens, full-size RC deck slab specimens, and real RC slab decks to be constructed.
Through experimental validation and full-scale numerical simulation, factors affecting cracking generation and propagation are identified.
Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00