선택한 단어 수는 입니다.
최소 단어 이상 선택하여야 합니다.
최소 단어 이상 선택하여야 합니다.
선택한 단어 수는 30입니다.
최대 10 단어까지만 선택 가능합니다.
최대 10 단어까지만 선택 가능합니다.
제안 방법
- The probability distribution of the carbonation rate and the concrete cover depth measured in field was determined by the goodness of fit test in order to invoke the Monte Carlo simulation method. Then, the Monte Carlo simulation were used to predict the service life of box culverts due to carbonation induced corrosion of steel in concrete. In order to deal with some special but frequently facing problem for the crack effect on the durability of reinforced concrete, the accelerated carbonation test for the cracked beam specimen was performed and the accelerated carbonation rate measured from the experiment was reflected in the Monte Carlo simulation.
- In the present study, the Monte Carlo simulation technique was used to assess the carbonation risk. For the simulation, mean value and standard derivation of the parametric values (i.e. carbonation depth and concrete cover depth) were obtained from the underground field investigation. Then, 100,000 of random samples for each parametric value were generated in the Monte Carlo simulation.
- The used period in each box culvert is ranged from 11 years to 29 years, in which inner surface of concrete box culvert has been exposed to carbon dioxide environment, as tabulated in Table 1. The investigation was performed in three parts inside box culvert: the upper slab and opposite wall surfaces. The concrete mix proportion for the box culverts was designed for 24 MPa of compressive strength and the cover concrete de pth to the reinforcement was designed for 50 mm.
- In fact, mass transport in crack can best be described if the crack itself is modeled as separated finite elements which have the free diffusivity for carbon dioxide in numerical analysis on the carbonation process. However, in this study, in order to experimentally consider the concrete crack effect on the service life due to carbonation of box culverts, the accelerated carbonation test for the cracked specimen was performed. Beam specimen with the same compressive strength of box culvert, a design strength 24 MPa, was newly manufactured for the accelerated carbonation test.
대상 데이터
- Box culverts for power transmission constructed in five regions in Korea, as shown in Photo 1, were investigated to estimate carbonation risk and service life due to carbonation.
데이터처리
- In the same manner as the service life estimated for five box culvers in the former section, the service life considering crack effect is obtained from the Monte Carlo simulation by employing the statistical coefficients defined by Eq. (7).
이론/모형
- From the measured carbonation depth from the field cores, the carbonation rate was determined in five regional sites in our nation : Seoul A, Seoul B, Seoul C, Kwangju and Mokpo. The probability distribution of the carbonation rate and the concrete cover depth measured in field was determined by the goodness of fit test in order to invoke the Monte Carlo simulation method. Then, the Monte Carlo simulation were used to predict the service life of box culverts due to carbonation induced corrosion of steel in concrete.
- In order to deal with some special but frequently facing problem for the crack effect on the durability of reinforced concrete, the accelerated carbonation test for the cracked beam specimen was performed and the accelerated carbonation rate measured from the experiment was reflected in the Monte Carlo simulation.
- The service life due to the risk of carbonation at the depth of the steel was calculated by one of the probabilistic method, the Monte Carlo simulation. The probability of corrosion due to carbonation was calculated and dotted with an increment of 1 years of time, as depicted in Fig.
- The distribution of the concrete cover depth was best fitted to the normal distribution, determined by the goodness of fit test such as the Kolmogorov-Smirnov test.
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