탄산화된 RC구조물의 표면보수에 대한 확률론적 LCC 평가

Abstract

본 연구에서는 콘크리트의 내구 수명과 보수비용만을 고려하여 결정론 및 확률론적 기법을 적용하였으며 각 마감재의 변동계수에 따른 보수시기 및 보수비용을 분석하였다. 이를 위해 탄산화가 진행된 콘크리트를 대상으로 표면 보수를 실시하고 보수후의 내구수명을 확률변수로 가정하여 보수후 LCC를 산출하였다. 결정론적인 모델에서는 내구수명에 도달할때, 보수비용이 적층식으로 평가되지만, 확률론적인 모델을 적용할 경우, 보수 비용과 보수 횟수가 동시에 평가되어 합리적인 보수시기 및 보수비용을 확률적으로 평가할 수 있다고 판단된다. Carbonation is one of the major detrimental factors to the reinforced concrete structures owing to penetration of atmospheric CO2 through the micro pores, thereby it reduces the durability of the concrete. The maintenance periods and cost for concrete according to the coefficient variation of different finishing materials is documented in literature. However, it is required to carry out the systematic and well planned studies. Therefore, keeping them in mind, surface repair was carried out to the carbonated concrete and the maintenance cost was calculated to measure the durability life after repair with different variable. The deterministic and probabilistic methods were applied for durability and repair cost of the concrete. In the existing deterministic model, the cost of repair materials increases significantly when the concrete structure reaches its service life. In present study using a stochastic model, the maintenance period and cost was evaluated. According to obtained results, there was no significant difference in the number of maintenance of the coefficient variation. The initial durability has a great influence on the maintenance time and cost of the structure. Unlike the deterministic model, the probabilistic cost estimating model reduces the number of maintenance to the target service life expectancy.