Influence of Concrete Constituents on Mode I Fracture Characteristics of Portland Cement Concrete

由于裂纹的产生和生长过程， 混凝土的断裂必然受到各种因素的影响， 混合物中的组分（以及应力状态、固化 条件、水分含量等），希望能够 验证拟议的测试标准适用于广泛的 关键混合参数的范围。 与此同时， 不同的混合参数对断裂性能的影响， 也可以确定裂纹前沿和加工区的位置。 这项工作的顺利完成将进一步提供 证据表明，断裂力学是一个可行的和有用的工具， 胶凝材料性能的表征 和发展的设计公式， 剪切强度、粘结强度、挠度响应和裂缝宽度 钢筋混凝土结构的尺寸和脆性 可以明确地考虑效果。

Since the process of initiation and growth of cracks which lead to fracture in concrete must surely be influenced by the various components in the mixture (as well as state of stress, curing conditions, moisture content, etc.), it would be desireable to verify that the proposed testing standards are suitable for a wide range of key mix parameters. Concomitantly, the influence of different mix parameters on fracture properties including the shape of the crack front and process zone also may be determined. The successful completion of this work will provide further evidence that fracture mechanics is a viable and useful tool for the characterization of the behavior of cementitious materials subjected to stress and for the development of design formulas for shear strength, bond strength, deflection response and crack width of reinforced concrete structures in which size and brittleness effects can be considered explicitly.