This study aimed at developing SBPCI (Sidewalk Block Pavement Condition Index) with sidewalk pavement condition survey data of Seoul city in order to attain a quantitative evaluation method of sidewalk pavement condition. The distress patterns of sidewalk pavement were classified into four groups of Crack/Loss, Roughness, Aging, and Corner Break. AHP (Analytic Hierarchy Process) technique was employed on the basis of the raking process of 31 pavement managers in order to analyze the influence of the distress patterns on the sidewalk pavement condition. The AHP analysis result indicated the weight of pop out, roughness, surface abrasion, and corner break were 0.521, 0.244, 0.164, and 0.070, respectively, by distress type. A model equation was derived by using the sidewalk pavement condition data from 420 sections. The correlation analysis between the result of the model equation and distress type revealed that the correlation of corner break was low to be excluded from SBPCI model; while pop out, roughness, and surface abrasion were statistically significant to be used as three variables of the developed SBPCI model.

Concrete structures under cyclic exposure to chlorides entail a higher risk of embedded steel corrosion along with accelerated ionic ingress from the environment. This study proposes a coupled transport model considering moisture and chloride distribution in concrete to investigate the influence of a cyclic exposure condition on chloride penetration. In this model, pore size distribution to quantify the effective pore space for moisture and chloride mobilizations was determined to establish the governing equation for chloride transport through non-saturated concrete. From the simulation results, the rate of chloride penetration increases with decreasing ambient humidity levels due to the enhanced chloride convection. Finally, the coupled transport model was verified by comparing in-situ data, showing reasonable correlations with 0.83 and 0.93 of determinant coefficients for 22 and 44 years of exposure, respectively, while those obtained from LIFE 365 were much lower.

The choice between continuously reinforced concrete pavement(CRCP) and jointed concrete pavement(JCP) for different concrete pavement applications has long been controversial. Research on these two types of pavement has been conducted continuously for decades, but existing studies have mostly focused on life cycle costs (LCCs) with numerous assumptions or have predicted life expectancy by using short-term performance results. In this study, comparing CRCP and JCP based on real performance data and actual maintenance and rehabilitation (M&R) cost data collected over 30 years from the Jungbu Expressway in Korea. To assess performance, the service life and pavement conditions of each pavement type were compared. To assess the cost, construction cost and M&R cost data collected over 30 years were compared. In terms of performance, CRCP was superior to JCP based on the 31-year service life of CRCP and the 28-year service life of JCP. In terms of pavement conditions, CRCP was also superior to JCP based on the Highway Pavement Condition Index (HPCI) and International Roughness Index (IRI). Furthermore, in terms of cost, although the construction cost of CRCP was slightly higher than that of JCP, the total cost of CRCP, including the M&R cost, was 8.5% less than that of JCP.