Schadensrisiko und Schadensentwicklung in Betonfahrbahndecken als Folge einer Alkali-Kieselsäure-Reaktion

碱-硅反应导致混凝土路面损坏和损坏的风险

• 批准号: 202349668
• 负责人: Professor Dr.-Ing. Harald S. Müller
• 金额: --
• 依托单位: Abteilung Baustoffe und Betonbau
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/202349668?language=en
• 关键词: Schadensrisiko; und; Schadensentwicklung; Betonfahrbahndecken; als

Concrete pavements are, apart from mechanical influence of traffic, especially subject to climatically conditioned and continuously changing thermal and hygric exposure as well as further stress due to constructional features arising e.g. from the building technique of a concrete pavement. As the case may be, this basic exposure meets an alkali-silica reaction (ASR), causing distinctive expansions. Although not inevitably, the thusly implied overall strain often leads to expanding broad cracks in carriageways. The proportion of ASR to this is practically unknown. Besides, ASR leads to decreased resistance of the concrete, which may as well result in cracks. Nonetheless, this cannot be quantified at this moment. Therefore, the actual mechanisms of the formation of cracks are unknown. This also excludes the appliance of well-directed countermeasures, which could e.g. consist of constructive means in different stages. The goal of the research project is to fill the existing knowledge gaps that is to analyse the demand due to ASR in the composite material concrete pavement under the complex exposure and resistance occurring in practice, to forecast the damage risk as well as gaining knowledge regarding an improved constructive design of the composite material. For this purpose, calculative analyses based on a complex numerical model using realistic constitutive equations are executed in addition to extensive experimental fracture mechanical examinations aiming at a determi-nation of the temporal variation of strength and deformation of concrete due to ASR.

除了交通的机械影响外，混凝土路面还特别受到气候条件和不断变化的热、湿暴露的影响，以及由于混凝土路面的建筑技术等建筑特征而产生的进一步应力。视情况而定，这种碱性暴露会发生碱-硅反应（ASR），引起明显的膨胀。尽管并非不可避免，但由此隐含的总应变往往会导致车道上的宽裂缝扩大。ASR在其中的比例实际上是未知的。此外，ASR还会导致混凝土阻力降低，从而产生裂缝。尽管如此，目前还无法对其进行量化。因此，裂缝形成的实际机制尚不清楚。这也不包括采用定向良好的对策，例如，这种对策可以由不同阶段的建设性手段组成。该研究项目的目标是填补现有的知识空白，即分析复合材料混凝土路面在复杂暴露和阻力下的ASR需求，预测损伤风险，并获得有关改进复合材料结构设计的知识。为此，除了广泛的断裂力学试验外，还进行了基于复杂数值模型的计算分析，使用现实的本构方程，旨在确定由于ASR引起的混凝土强度和变形的时间变化。

项目成果

Damage risk and development in concrete pavements caused by an Alkali-Silica Reaction

碱硅反应引起的混凝土路面损坏风险和发展

• DOI: 10.1201/b18972-14
• 发表时间: 2015
• 作者: Wiedmann;Müller
• 通讯作者: Müller

Auswirkungen von Ermüdungsbeanspruchungen auf Struktur und Eigenschaften von Fahrbahndeckenbeton

疲劳应力对路面混凝土结构与性能的影响

• DOI: 10.1002/best.201400096
• 发表时间: 2015
• 期刊: Beton‐ und Stahlbetonbau
• 作者: Wiedmann;Voland;Müller
• 通讯作者: Müller

Effects of fatigue loading and alkali–silica reaction on the mechanical behavior of pavement concrete

• DOI: 10.1002/suco.201600179
• 发表时间: 2017-05
• 期刊: Structural Concrete
• 影响因子: 3.2
• 作者: A. Wiedmann;F. Weise;E. Kotan;H. Müller;B. Meng