Abstract
This paper investigates the strain behavior of normal concrete and expansive concrete used in three different newly constructed reinforced concrete structures, i.e., slabs, water tank walls, and pavements. Expansive additives with different chemical compositions were used for expansive concrete structures. Strain gauges and thermocouples are installed in different locations in each of the structures to study the effects of restraints from reinforcement, adjacent structural member, base friction, as well as effects of environment, such as moisture loss due to drying and sunlight. The results indicated that expansive concrete could reduce contraction strain due to shrinkage at long term. Environmental conditions, such as ambient temperature and relative humidity, causing drying of the concrete surface resulted in non-uniform strain along the thickness of the structure. Reinforcement as an internal restraint is also a significant factor for the expansion and shrinkage strains of the structures. Moreover, the level of expansion and shrinkage strains can also be affected by external restraints, such as base friction, provided by the subbase materials, adjacent walls, and base slab, etc. The characteristics of strains in concrete and reinforcing bars, with various mentioned restraint and environment conditions can be observed in this study.
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Acknowledgements
The first author would like to acknowledge Sirindhorn International Institute of Technology, Thammasat University for the scholarship for the master’s degree study. The authors would like to express appreciation to Research and Innovation Center SCG Cement Co., Ltd and Denka Co., Ltd for supporting a part of research funds, also Ritta Co., Ltd for permission to conduct measurement at the construction site. This study is also supported by the Center of Excellence in Material Science, Construction and Maintenance Technology Project, Thammasat University and National Science and Technology Development Agency (NSTDA) chair professor grants.
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Myint, S.H., Tanapornraweekit, G. & Tangtermsirikul, S. Investigation of expansive concrete structures through strain monitoring in field structures. Asian J Civ Eng 22, 565–578 (2021). https://doi.org/10.1007/s42107-020-00332-1
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DOI: https://doi.org/10.1007/s42107-020-00332-1