Effect of steel reinforcement on temperature and pressure within a porous concrete slab subjected to microwave heating
Conference
Li, W, Ebadian, MA, White, TL et al. (1993). Effect of steel reinforcement on temperature and pressure within a porous concrete slab subjected to microwave heating
. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 240 1-10.
Li, W, Ebadian, MA, White, TL et al. (1993). Effect of steel reinforcement on temperature and pressure within a porous concrete slab subjected to microwave heating
. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 240 1-10.
Li, W; Ebadian, MA; White, TL; Grubb, RG; Foster, D
abstract
In the present paper, the concrete decontamination and decommissioning (D&D) problem using microwave technology is investigated theoretically. A one-dimensional, uniform plane microwave model is modified to determine the electromagnetic fields and microwave power dissipation within the concrete, which is influenced by steel reinforcement. The temperature variable concrete dielectric properties are coupled in the model of electromagnetic fields. Also, a one-dimensional heat and mass transfer model within the porous concrete and the evaporation of residual water due to the microwave power dissipation are considered. The microwave power dissipation, and the temperature and inner steam pressure distributions and their variations are computed during the D&D process. The effects of the presence of varying steel reinforcements and their location on the microwave power dissipation and the temperature and inner stream pressure distributions are discussed accordingly. In order to compare the present results with the experimental findings, only two microwave frequencies (2.45 and 10.6 GHz) are utilized in the analysis. Due to the presence of varying steel reinforcements for the 2.45 GHz microwave frequency, more microwave energy will be dissipated between the front surface of the concrete and the reinforcement, this causing a short concrete spalling-off time (ts). Since the microwave penetration distance for a 10.6 GHz frequency is very short, the effect of the reinforcement is barely noticeable. It is further noted that for the same reinforcement, the concrete spalling-off time (ts varies with different positions of the reinforcement (Ls) at 2.45 GHz or lower.
