Predicting Radon Exhalation in Reinforced Concrete: A Multiphysics Approach

Abstract

Radon-222 accumulation in indoor environments represents a significant health hazard, yet standard assessment protocols largely focus on the initial properties of building materials, neglecting the temporal evolution of the concrete microstructure. This research addresses this omission by proposing a multiphysics simulation framework that links structural mechanics with radiation protection. Central to this approach is the Concrete-Surface-Radon (CSR) Simulator, a numerical tool acting as a digital twin for radon accumulation testing. By coupling a mechanical characterization engine with a mass transport solver, the simulator translates stressstrain states and rheological phenomena into local diffusivity variations. The comparative analysis reveals that ignoring the mechanical history of structural elements can lead to a significant underestimation of radiological risks.