Porosity has been used widely as an index for the void volume fraction within the microstructure of cement paste. However, the porosity has its limitations as a scalar parameter so that alternative measures could help further identifying the characteristics of pore microstructure and better correlating microstructure with properties. The lineal-path function has been shown its potential to describe the characteristics of complex microstructures. In this study, the centroid of the lineal-path function is investigated as a supplement or alternative parameter to porosity for characterizing pore microstructure and correlating the characteristics with mechanical properties. In particular, the parameter is used to determine the diffusive crack length parameter, one of the material modeling parameters of the crack phase field model. The centroid of the lineal-path function identifies the bimodal distribution of the pore microstructures within cement paste, which cannot be captured with porosity. The evaluated mechanical properties such as stiffness and tensile strength using the crack phase field model whose parameter is determined from the centroid of the lineal-path function are in the range of expected values. It is shown that the centroid of the lineal-path function has a potential as an alternative or supplement parameter for microstructure characterization and for determining the modeling parameter of the crack phase field model.
|Title of host publication||Computational Modelling of Concrete Structures - Proceedings of the conference on Computational Modelling of Concrete and Concrete Structures, EURO-C 2018|
|Editors||Bernhard Pichler, Jan G. Rots, Günther Meschke|
|Number of pages||6|
|Publication status||Published - 2018|
|Event||Conference on Computational Modelling of Concrete and Concrete Structures, EURO-C 2018 - Bad Hofgastein, Austria|
Duration: 2018 Feb 26 → 2018 Mar 1
|Name||Computational Modelling of Concrete Structures - Proceedings of the conference on Computational Modelling of Concrete&amp;amp;amp;amp;amp;amp;amp;nbsp;and Concrete Structures, EURO-C 2018|
|Conference||Conference on Computational Modelling of Concrete and Concrete Structures, EURO-C 2018|
|Period||18/2/26 → 18/3/1|
Bibliographical noteFunding Information:
This research was supported by a grant from the Korea Research Foundation, funded by the Korean Government (NRF-2015K1A3A1A59073929 and NRF-2016R1D1A1B03931635). Parallel computation in this work was supported by the PLSI supercomputing resources of the Korea Institute of Science and Technology Information and the resources of the UNIST Supercomputing Center. The μ-CT images were obtained from the synchrotron operated by the Pohang Accelerator Laboratory (PAL) in Korea. Authors gratefully acknowledge Mr. Xiaoxuan Zhang and Prof. Chri-tian Linder at Stanford University for sharing their knowledge and implementation of the crack phase field model.
All Science Journal Classification (ASJC) codes
- Modelling and Simulation
- Civil and Structural Engineering