Combination and automation of computer-aided methods for quantitative crack analysis of concrete - Part 2

薄片二维图像分析逐渐自动化并得到验证。除此之外，可以在预处理和分析过程中实现优化。一种类似的方法已被用于使用计算机断层扫描对标本进行三维分析。为了获得进一步的数据，将这些二维和三维图像分析相互结合。在量化整个标本体积方面还不能取得令人满意的结果，但证明了它们的可行性。该项目的进一步工作将使这最后一步成为可能。继续进行的研究项目分为三个阶段。第三阶段工程将继续进行并完成。该阶段包括试样总裂纹体积的最终量化以及二维和三维图像分析的比较。后者通过两种方法的结合得到关键信息。在此基础上，制作了试验样品，验证了组合方法在实际中的应用。因此，这种方法的局限性和优点可以用一种易于理解的方式来展示。在第四阶段，将根据裂缝在混凝土基质中的位置对裂缝进行自动分类。这将有可能对裂缝的各种原因，如冻结和解冻、碱-硅反应或收缩，得出更有效的结果。在阶段V中，上面描述的工作将伴随着到目前为止开发的工作流程的迭代适应。此外，其目的是为科学界发布工作流程。该方法将免费提供，包括描述、应用程序示例和源代码。

The 2D image analysis of thin sections was gradually automated and validated. Apart from this, optimisations could be realised regarding pre-processing and in the analysis process. A comparable approach has been adopted for the 3D analysis of specimens using computer tomography. To acquire further data, these 2D and 3D image analyses were combined with each other. Satisfactory results in quantifying the entire specimen volume could not yet be achieved, but their feasibility was demonstrated. Further work on the project will make this final step possible. The research project to be continued is divided into three phases. Phase III will be continued and completed. The phase includes the final quantification of the total crack volume of a specimen as well as the comparison of 2D and 3D image analysis. From the latter the key information is obtained by combining the two methods. Further on, test specimens are produced which test the application of the combined methods in practice. As a result, the limits and advantages of this method can be demonstrated in a comprehensible way. In phase IV, an automated classification of the cracks based on their location in the concrete matrix will be implemented. This will make it possible to derive more efficient results with regard to the various causes of cracks, such as freezing and thawing, the alkali-silica reaction or shrinkage. In phase V, the work described above will be accompanied by an iterative adaptation of the workflow developed so far. In addition, the aim is to publish the workflow for the scientific community. The method will be made freely accessible, including a description, application examples and source code.