According to the discontinuous structural characteristics of a gas turbine, by considering the contact thermal resistance of the rough surface, a contact thermal resistance measurement experiment was conducted in this study. The main objectives of this work were to investigate the influence mechanism and change law of the contact thermal resistance characteristics on flange installation. Furthermore, this study conducted a theoretical analysis of contact thermal resistance and the calculation of a typical flange mounting edge based on actual operating conditions. The research results show that the contact thermal resistance of a typical flange mounting edge increases with an increase in flange clearance under different tightening torques, which is essentially proportional to the flange clearance. As the flange clearance increases, the unit contact thermal conductivity firstly decreases rapidly. Then, as the flange clearance reaches 0.4 mm, the decreasing rate of unit contact thermal conductivity tends to flatten. In addition, the contact thermal resistance of the typical flange mounting edge decreases with the increase in the tightening torque under different flange clearances. Furthermore, the contact area ratio is not related to the material, and the contact thermal resistance under actual working conditions can be calculated using the unit contact area.
The corrosion of reinforcements in recycled aggregates (RA) structures could be triggered by chloride attack. Ground granulated blast furnace slag (GGBS) has been recognized a significant cement replacement to improve chloride resistant of concrete. However, the study aimed at time-dependent chloride diffusion of recycled aggregates concrete (RAC) with GGBS was still scarce. Thus, with the data generated at varying immersion durations from long-term bulk immersion tests, the effects of the content of ground granulated blast furnace slag (GGBS) and immersion time on time-dependent chloride diffusion were studied. The results indicated that the apparent diffusion coefficient (D
app) of recycled aggregates concrete decreases with immersion time. Moreover, the total chloride concentration decrease with the increase of GGBS replacement. When increasing the content of GGBS from 0% to 30%, the value of D
app decreases from 28.9% to 52.2%, while 67.2%∼40.6% of reduction was observed on D
app with the addition of 60% GGBS at different immersion time.
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