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Modelling of Hydration and Microstructure Formation of Irregular-shaped Cement

Liu, C; Zhang, M; (2017) Modelling of Hydration and Microstructure Formation of Irregular-shaped Cement. In: Proceedings of the 37th Annual Cement and Concrete Science Conference. The Institute of Materials, Minerals and Mining: London, UK. (In press). Green open access

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Abstract

The shape of cement powder particles plays a crucial role in particle packing and hydration of cement. However, cement powder is generally regarded as sphere for simplification in most cement hydration models. This paper aims to investigate the influence of cement particle shapes on hydration of Portland cement and microstructure of cement paste. A novel central growth model is proposed to generate cement particles with irregular shapes. The particle shape library for single particles and particle packing algorithm are then developed to reconstruct initial 3D microstructures. Afterwards, the hydration process of cement with different shapes are simulated using CEMHYD3D model. The simulated hydration heat, degree of hydration and setting of cement paste with water-to-cement (w/c) ratio of 0.35 are compared with experimental data. The results indicate that the reconstructed irregular-shaped particles have good description for real cement particles in terms of surface area, particle size distribution and geometry. The effect of particle shapes on hydration is significant due to difference in surface area and geometric discrepancy, whereas this effect becomes less obvious with decreasing w/c ratio. The cement hydration model accounting for irregular-shaped particles can serve as an effective tool to better understand cement hydration mechanisms and microstructure formation.

Type: Proceedings paper
Title: Modelling of Hydration and Microstructure Formation of Irregular-shaped Cement
Event: 37th Annual Cement and Concrete Science Conference
Dates: 11 September 2017 - 12 September 2017
Open access status: An open access version is available from UCL Discovery
Publisher version: https://www.iom3.org/cementitious-materials-group/...
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.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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
URI: https://discovery.ucl.ac.uk/id/eprint/10060577
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