Numerical Simulation of Early Age Cracking of Reinforced Concrete Bridge Decks with a Full-3D Multiscale and Multi-Chemo-Physical Integrated Analysis
Numerical Simulation of Early Age Cracking of Reinforced Concrete Bridge Decks with a Full-3D Multiscale and Multi-Chemo-Physical Integrated Analysis
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DOI：
10.3390/app8030394
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发表时间：
2018-03
期刊：
影响因子：
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通讯作者：
T. Ishida;Kolneath Pen;Yasushi Tanaka;Kosuke Kashimura;I. Iwaki
中科院分区：
文献类型：
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作者：
T. Ishida;Kolneath Pen;Yasushi Tanaka;Kosuke Kashimura;I. Iwaki
2011年11月，日本政府决定在东北地区建设“复兴之路”，以加速2011年3月东日本大地震后的恢复。由于东北地区在冬季经历了如此寒冷和多雪的天气，预计会因霜冻损坏、除冰剂的氯化物侵蚀、碱-硅反应、开裂和疲劳的组合而发生复杂的降解。因此，为了提高道路结构，特别是钢筋混凝土（RC）桥面板的耐久性性能，提出了多种对策：混合料中的低水灰比，矿物掺合料，如粉碎粒化高炉矿渣和/或粉煤灰，以减轻氯化物侵蚀和碱-硅反应的风险，防腐钢筋和6%的夹带空气的冻害。这里应该注意的是，这种高耐久性规格可能会相反地增加由于大量水泥和矿物掺合料的使用而导致的温度和收缩引起的早期开裂的风险。在此背景下，本文对钢筋混凝土桥面板的早期变形和开裂进行了全三维多尺度、多物理化学综合分析的数值模拟。首先，简要介绍了一个基于系统知识耦合微观热力学现象和微观结构力学的固化胶凝材料多尺度本构模型。为了评估早期的温度和收缩引起的裂缝在真实的桥面，研究开始广泛的模型验证，通过应用多尺度和多物理集成分析系统，以小样本和模拟RC桥面试件。然后，通过当前的计算系统的应用，影响早期的温度和收缩引起的裂缝的产生和扩展的因素，确定通过实验验证和全尺寸的数值模拟上真实的RC板桥面。
In November 2011, the Japanese government resolved to build “Revival Roads” in the Tohoku region to accelerate the recovery from the Great East Japan Earthquake of March 2011. Because the Tohoku region experiences such cold and snowy weather in winter, complex degradation from a combination of frost damage, chloride attack from de-icing agents, alkali–silica reaction, cracking and fatigue is anticipated. Thus, to enhance the durability performance of road structures, particularly reinforced concrete (RC) bridge decks, multiple countermeasures are proposed: a low water-to-cement ratio in the mix, mineral admixtures such as ground granulated blast furnace slag and/or fly ash to mitigate the risks of chloride attack and alkali–silica reaction, anticorrosion rebar and 6% entrained air for frost damage. It should be noted here that such high durability specifications may conversely increase the risk of early age cracking caused by temperature and shrinkage due to the large amounts of cement and the use of mineral admixtures. Against this background, this paper presents a numerical simulation of early age deformation and cracking of RC bridge decks with full 3D multiscale and multi-chemo-physical integrated analysis. First, a multiscale constitutive model of solidifying cementitious materials is briefly introduced based on systematic knowledge coupling microscopic thermodynamic phenomena and microscopic structural mechanics. With the aim to assess the early age thermal and shrinkage-induced cracks on real bridge deck, the study began with extensive model validations by applying the multiscale and multi-physical integrated analysis system to small specimens and mock-up RC bridge deck specimens. Then, through the application of the current computational system, factors that affect the generation and propagation of early age thermal and shrinkage-induced cracks are identified via experimental validation and full-scale numerical simulation on real RC slab decks.