Relaxation Assessment of Steel Wire Strand for Prestressing of Concrete
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Abstract
This research aim to study the relaxation of stranded steel wire for prestressed concrete. Low relaxation type. By using the test method according to TIS 420-2540 standard. When using the initial tensile strength 60%, 70% and 80% of the maximum tensile, respectively. The maximum relaxation value at 1,000 hours is lower than 1%, 2.5% and 4.5% respectively. The results from this research can use to confirm the compliance with the mechanical testing requirements of stranded wire TIS. 420-2540, Clause 6.3.3
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References
Suarez, F., J. Galvez, J. Atienza, D. Cendon and M. Elices. 2012. Influence of the storage conditions on prestressing steel relaxation losses. Materials de Construction. 62: 531-546.
Thailand Industrial Standard. 1997. TIS 420-1997: Stranded Wire for Prestressed Concrete. Thailand
Industrial Standard Institute., Thailand. (in Thai)
Torill, Y., H. Iwata and T. Katsumata. 1962. Relaxation of PC Steel Wire. Journal of the Japan Society
for Testing Materials. 11: 768-774.
Zdenek, P., M. Hon and Q. Yu. 2013. Relaxation of prestressing steel at varying strain and temperature: viscoplastic constitutive Relation. Journal of Engineering Mechanics. 139:814-823.
Zeren, A. and M. Zeren. 2003. Stress relaxation properties of prestressed steel wires. Journal of
Materials Processing Technology. 141: 86-92.