Liu, C;
Zhang, M;
Fang, G;
Bai, Y;
Zhang, Y;
(2018)
Modelling of capillary pore structure evolution in Portland cement pastes based on irregular-shaped cement particles.
In: Basheer, P, (ed.)
6th International Conference on Durability of Concrete Structures, ICDCS 2018.
(pp. pp. 771-780).
ICDCS: Leeds, UK.
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Abstract
The pore structure plays a crucial role in durability performance of cement-based materials. However, the pore structure in cement pastes is highly dependent on the initial packing of cement particles and cement hydration process, which seems to be related to the shapes of cement particles. This paper proposed a numerical method to investigate the effect of cement particle shapes on capillary pore structures in cement pastes. In this study, irregular-shaped cement particles with various shapes are generated using a novel central growth model, and then incorporated into CEMHYD3D model to simulate Portland cement hydration. Some home-made programs of determining pore structure parameters including porosity, pore size distribution, connectivity and tortuosity are subsequently performed on the extracted three-dimensional network of capillary pore structure in cement pastes. The modelling results indicate that shape-induced large surface area in more non-equiaxed irregular-shaped cement particles can improve pore structure parameters in hardened cement pastes, but this effect will be slight in the later curing period and at a low water-tocement ratio. In addition, the less considered geometric difference plays a role in pore structure evolution especially for extremely non-equiaxed cement particle. However, the geometric attribute has a weak effect on pore structure parameters overall. The modelling results can provide a new insight into durability design in cement-based materials by means of manipulating cement particle shape in the future.
| Type: | Proceedings paper |
|---|---|
| Title: | Modelling of capillary pore structure evolution in Portland cement pastes based on irregular-shaped cement particles |
| Event: | Sixth International Conference On Durability Of Concrete Structures (ICDCS 2018) |
| ISBN: | 1849953945 |
| ISBN-13: | 9781849953948 |
| Open access status: | An open access version is available from UCL Discovery |
| Publisher version: | https://docs.lib.purdue.edu/icdcs/2018/dsm/1/ |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | modelling; cement particle shape; irregular shapes; hydration; capillary pore; microstructure. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10093088 |
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