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Structural Engineering and Mechanics Volume 64, Number 6, December25 2017 , pages 793-802 DOI: https://doi.org/10.12989/sem.2017.64.6.793 |
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Numerical prediction of stress and displacement of ageing concrete dam due to alkali-aggregate and thermal chemical reaction |
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Nik Zainab Nik Azizan, Angshuman Mandal, Taksiah A. Majid, Damodar Maity and Fadzli Mohamed Nazr
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| Abstract | ||
| The damage of concrete due to the expansion of alkali-aggregate reaction (AAR) and thermal-chemical reactions affecting the strength of concrete is studied. The empirical equations for the variations of expansion of AAR, compressive strength and degradation of the modulus of elasticity with time, and compressive strength with degradation of the modulus of elasticity are proposed by analysing numerous experimental data. It is revealed that the expansion of AAR and compressive strength increase with time. The proposed combination of the time variations of chemical and mechanical parameters provides a satisfactory prediction of the concrete strength. Seismic analysis of the aged Koyna dam is conceded for two different long-term experimental data of concrete incorporating the proposed AAR based properties. The responses of aged Koyna dam reveal that the crest displacement of the Koyna dam significantly increases with time while the contour plots show that major principal stress at neck level reduces with time. As the modulus of elasticity decreases with ages the stress generated in the concrete structure get reduces. On the other hand with lesser value of modulus of elasticity the structure becomes more flexible and the crest displacement becomes very high that cause the seismic safety of the dam reduce | ||
| Key Words | ||
| degradation of concrete; alkali-aggregate reaction; aged concrete dam; thermo-chemical reaction; compressive strength of aged concrete; numerical modeling | ||
| Address | ||
| Nik Zainab Nik Azizan : School of Civil Engineering, Universiti Sains Malaysia, Penang, Malaysia; School of Environmental Engineering, Universiti Malaysia Perlis, Perlis, Malaysia Angshuman Mandal : Department of Civil Engineering, Indian Institute of Technology, Kharagpur, India Taksiah A. Majid : School of Civil Engineering, Universiti Sains Malaysia, Penang, Malaysia Damodar Maity : Department of Civil Engineering, Indian Institute of Technology, Kharagpur, India Fadzli Mohamed Nazr : School of Environmental Engineering, Universiti Malaysia Perlis, Perlis, Malaysia | ||