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정성규(Sung-Gyu Jung),이광우(Kwang-Wu Lee),김주형(Ju-Hyong Kim),조삼덕(Sam-Deok Cho),구현진(Hyun-Jin Koo),조항원(Hang-Won Cho) 한국지반신소재학회 2012 한국지반신소재학회 학술발표회 Vol.2012 No.11
Creep reduction factor(RF<sub>cr</sub>) of geosynthetics can be determined through conventional creep test and accelerated creep test such as Tim-Temperature Superposition(TTS) or Stepped Isothermal Method(SIM) specified in KS K ISO TR 20432. In this study, Stepped Isothermal Method(SIM) and conventional creep test of strip geosynthetic reinforcement are conducted to evaluate creep tensile deformation. Conventional creep test is being performed about 7,000 hours to compare with the results from accelerated creep test. The behaviour of creep deformation of conventional creep test is similar to that of SIM so far.
정성규(Sung-Gyu Jung),이광우(Kwang-Wu Lee),김주형(Ju-Hyong Kim),조삼덕(Sam-Deok Cho),구현진(Hyun-Jin Koo),조항원(Hang-Won Cho) 한국지반신소재학회 2013 한국토목섬유학회 학술발표회 Vol.2013 No.11
In this study, creep reduction factor(RFcr) of geosynthetic strip for reinforcement is estimated by using guideline specified in KS K ISO TR 20432. Time-Temperature Superposition(TTS) and conventional creep test are conducted for the case of 66% ~ 82% of ultimate tensile strength(UTS) of the reinforcement. The creep deformation for the conventional method is slightly different compared to the creep deformation for the SIM. Based on the results, Creep reduction factors are 1.733 using conventional method, and 1.406 using accelerated creep test at 50 years of design life. It makes a large difference in creep reduction factors for both cases because rupture time of the case for applying 70% of UTS appears to be early. Therefore, additional creep rupture data of conventional method is needed to determine reasonable value.