论文标题
碱性反应的中尺度有限元建模
Meso-scale Finite Element Modeling of Alkali-Silica-Reaction
论文作者
论文摘要
混凝土中的碱 - 硅氧硅反应（ASR）是一种化学反应，它产生膨胀产物，通常称为“ ASR凝胶”，并随着时间的推移导致混凝土的破裂和损害。在过去的几十年中，ASR影响了世界各地的许多基础设施，一直是许多研究的主题。尽管如此，该反应的许多方面仍然未知。在此数值调查纸中，使用有限元方法模拟了三维混凝土中间结构模型。明确表示粗骨料，水泥糊和ASR凝胶。依赖温度的欧吉人应变应用于模拟的ASR凝胶口袋，以捕获其膨胀行为。这对周围的聚集体和水泥糊施加压力，从而导致裂缝的启动和传播。使用实验数据对ASR引起的混凝土样品的自由扩展进行建模和验证。讨论了不同关键因素对骨料产生损伤的影响，粘贴和宏观扩张的影响。
The alkali-silica reaction (ASR) in concrete is a chemical reaction, which produces an expansive product, generally called ''ASR gel'', and causes cracking and damage in concrete over time. Affecting numerous infrastructures all around the world, ASR has been the topic of much research over the past decades. In spite of that, many aspects of this reaction are still unknown. In this numerical-investigation paper, a three-dimensional concrete meso-structure model is simulated using the finite-element method. Coarse aggregates, cement paste, and ASR gel are explicitly represented. A temperature dependent eigen-strain is applied on the simulated ASR gel pockets to capture their expansive behavior. This applies pressure on the surrounding aggregates and the cement paste, leading to cracks initiation and propagation. Free expansion of concrete specimens due to ASR is modeled and validated using experimental data. Influence of different key factors on damage generation in aggregates and paste and macroscopic expansion are discussed.
