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.

混凝土路面除了受到交通的机械影响外，还会受到气候条件和不断变化的温度和湿度暴露，以及由于混凝土路面的建筑技术等施工特点而产生的进一步应力的影响。根据情况，这种基本暴露遇到了碱-硅酸反应(ASR)，导致了独特的膨胀。尽管并非不可避免，但由此隐含的总体压力往往会导致车道上不断扩大的宽阔裂缝。ASR在这方面的比例几乎是未知的。此外，ASR会导致混凝土的抗力降低，从而可能导致裂缝。尽管如此，目前还无法量化这一点。因此，裂缝的实际形成机制尚不清楚。这也排除了有针对性的反措施的适用，例如，这些反措施可以由不同阶段的建设性手段组成。该研究项目的目的是填补现有的知识空白，即分析在实践中发生的复杂暴露和阻力下复合材料混凝土路面因ASR而产生的需求，预测损坏风险，并获得关于复合材料改进结构设计的知识。为此，除了进行广泛的实验断裂力学检验外，还利用实际本构方程进行了基于复杂数值模型的计算分析，以确定混凝土由于ASR而产生的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