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Advances in Materials Science and Engineering
Volume 2016, Article ID 2372835, 10 pages
Research Article

Calculation of Constrained Stress in Expansive Mortar with a Composite Creep Model

1Graduate School of Engineering, Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran, Hokkaido 080-8585, Japan
2Slag Utilization Research Team, Research Institute of Industrial Science & Technology, 32 Hyoja-dong, Nam-ku, Pohang 37673, Republic of Korea

Received 26 February 2016; Revised 11 May 2016; Accepted 29 May 2016

Academic Editor: Antônio G. de Lima

Copyright © 2016 Hyeonggil Choi and Bongsuk Cho. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The creep phenomenon of hardening cement paste mixed with an expansive additive was modeled by considering the creep performance of hydration products of cement and expansive additive. A new composite model that is appropriate for particle conditions is proposed by considering the balance of the hydration products of cement and expansive additive and the stress redistribution phenomenon of hydration products newly generated by the progress of hydration. The creep of mortar and concrete mixed with the expansive additive was evaluated using a composite model of the paste and aggregate. Under the assumption that the modeled creep deformation is proportional to the stress and the gel volume of the hydration products, which allows the law of superposition to be applied, the distribution stress was predicted by applying the step-by-step method at each time increment. By predicting the maximum tensile stress applied to an inner steel ring through a creep analysis based on the measured deformation of the inner steel ring, it is possible to predict the stress progression with age to some degree.