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Fatigue and fracture mechanical properties of selected concrete for subtle precast structural elements

机译：微妙的预制结构元素所选混凝土的疲劳和裂缝力学性能

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Precast concrete elements used as a civil structure are usually made of a cement-based matrix and natural aggregates (such as sand, gravel, crushed stone, etc.). These structures are usually exposed not only to a static load but also to a cyclic load if they load the bearing part of a bridge (traffic etc.). The knowledge of fatigue and fracture mechanical characteristics is important in designing and modelling new structures. This paper introduces and compares fracture mechanical properties obtained from static and fatigue tests for three kinds of concrete. The focus was set on the bulk density, flexural and compressive cube strength, fracture toughness and fatigue properties (S?N ? W?hler curve). All of these tests are important for a practical application in the design of precast concrete structures. The experimental results were statistically analysed and they showed that the fatigue and mechanical fracture properties improved with improved mechanical parameters of concrete.
机译：用作民用结构的预制混凝土元件通常由水泥基质和天然骨料（如沙，砾石，碎石等）制成。如果装载桥梁的轴承部分（交通等），则这些结构通常不仅暴露于静载荷，而且还暴露于静载荷。疲劳和骨折机械特性的知识在设计和建模新结构方面是重要的。本文介绍了三种混凝土静态和疲劳试验中获得的骨折机械性能。该重点设定在堆积密度，弯曲和压缩立方体强度，断裂韧性和疲劳性能（s≤n≤w≤hler曲线）上。所有这些测试对于对预制混凝土结构设计的实际应用非常重要。实验结果在统计学上分析，并表明疲劳和机械骨折性能改善了混凝土的机械参数。

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