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터널내 환경을 고려한 콘크리트 포장의 양생제 살포기준 연구
류성우,권오선,송거름수,이민경,조윤호 한국도로학회 2014 한국도로학회논문집 Vol.16 No.3
PURPOSES: This study is to suggest tunnel length to spray curing compound, based on the field tests. METHODS : At first field test, length from the entrance of tunnel to wet wall was checked by visual survey. The second and third test, various sensors were installed in concrete or in tunnel, such as RH sensor, temperature sensor, portable weather station and etc.. And also, test for bleeding and retaining water of concrete were conducted to evaluate environmental effect on concrete pavement. RESULTS: The result of the field experiment for tunnel length to spray curing compound indicates that length changes depending on tunnel length, season, and location. Environmental condition of a short tunnel was not much different between location near entrance and at center of tunnel. However, in case of a medium and long tunnel, effect of outside environmental condition decreased, when location moved into tunnel center of it. CONCLUSIONS: From the testing results, it can be proposed that optimum tunnel length to spray curing compound is 60m for a medium and long tunnel, and whole length for a short tunnel.
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터널내 환경을 고려한 콘크리트 포장의 양생제 살포기준 연구
류성우,권오선,송거름수,이민경,조윤호 한국도로학회 2014 한국도로학회논문집 Vol.16 No.3
PURPOSES: This study is to suggest tunnel length to spray curing compound, based on the field tests. METHODS : At first field test, length from the entrance of tunnel to wet wall was checked by visual survey. The second and third test,various sensors were installed in concrete or in tunnel, such as RH sensor, temperature sensor, portable weather station and etc.. And also, testfor bleeding and retaining water of concrete were conducted to evaluate environmental effect on concrete pavement. RESULTS: The result of the field experiment for tunnel length to spray curing compound indicates that length changes depending on tunnellength, season, and location. Environmental condition of a short tunnel was not much different between location near entrance and at center oftunnel. However, in case of a medium and long tunnel, effect of outside environmental condition decreased, when location moved into tunnelcenter of it. CONCLUSIONS: From the testing results, it can be proposed that optimum tunnel length to spray curing compound is 60m for a mediumand long tunnel, and whole length for a short tunnel. PURPOSES: The dynamic modulus can be determined by applying the various theories from the Impact Resonance Testing(IRT) Method. The objective of this paper is to determine the best theory to produce the dynamic modulus that has the lowest error as the dynamic modulusdata obtained from these theories(Complex Wave equation Resonance Method related to either the transmissibility loss or not, DynamicStiffness Resonance Method) compared to the results for dynamic modulus determined by using the Universal Testing Machine. The ultimateobject is to develop the predictive model for the dynamic modulus of a Linear Visco-Elastic specimen by using the Complex Wave equationResonance Method(CWRM) came up for an existing study(S. O. Oyadiji; 1985) and the Optimization. METHODS: At the destructive test which uses the Universal Testing Machine, the dynamic modulus results along with the frequency can beused for determining the sigmoidal master curve function related to the reduced frequency by applying Time-Temperature SuperpositionPrinciple. RESULTS: The constant to be solved from Eq. (11) is a value of 14.13. The reduced dynamic modulus obtained from the IRT consideringthe loss factor related to the impact transmissibility has RMSE of 367.7MPa, MPE of 3.7%. When the predictive dynamic modulus model wasapplied to determine the master curve, the predictive model has RMSE of 583.5MPa, MPE of 3.5% compared to the destructive test results forthe dynamic modulus. CONCLUSIONS: Because we considered that the results obtained from the destructive test had the most highest source credibility in thisstudy, the dynamic modulus data obtained respectively from DSRM, CWRM were compared to the results obtained from the destructive testby using th IRT. At the result, the reduced dynamic modulus derived from DSRM has the most lowest error.
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