Issue |
EPJ Web Conf.
Volume 221, 2019
XXVI Conference on Numerical Methods for Solving Problems in the Theory of Elasticity and Plasticity (EPPS-2019)
|
|
---|---|---|
Article Number | 01001 | |
Number of page(s) | 7 | |
DOI | https://doi.org/10.1051/epjconf/201922101001 | |
Published online | 30 October 2019 |
https://doi.org/10.1051/epjconf/201922101001
In-situ curing mechanism of Portland cement
Tomsk State University of Architecture and Building, 2, Solyanaya Sq., 634003, Tomsk, Russia
* Corresponding author: abzaev2010@yandex.ru
Published online: 30 October 2019
The paper presents the results of predictive modelling of the curing mechanism of the type CEM I 42.5B Portland cement using the VCCTL tool. The curing lasts during 28 days at 20 оС and the water-cement (W/C) ratio of 0.26, 0.30, 0.35 and 0.40. It is shown that the degree of Portland cement hydration is ~0.70 after 28-day curing. The growth in the W/C ratio significantly intensifies the hydration rate and the dissolution of clinker minerals. The amount of the main hydration products calcium silicate hydrate (C-S-H) and portlandite considerably increases with the W/C ratio. In Portland cement, the fraction of hydrated cement achieves 0.60 of the solid phase and the pore space. It is found that the effective elastic moduli rapidly increase during 400 hours, and then monotonely lower down to 16.79 GPa for the bulk modulus, 8.90 GPa for the shear modulus and 22.69 GPa for Young’s modulus. Relatively high values of the effective elastic moduli are explained by the higher content of the clinker phases and, probably, the higher degree of C-S-H crystallinity. The dependence between the yield stress and Young’s modulus is in good agreement with the VCCTL microstructural model of Portland cement curing.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.