Benchmark for reactive transport codes with application to concrete alteration in subsurface and geological disposal conditions

摘要: We present a set of three benchmark problems, pertaining to relevant processes of concrete alteration in the context of radioactive and hazardous waste immobilization and disposal:(1) atmospheric carbonation of concrete,(2) a concreteclay interactions problem in a saturated geological disposal concept, and (3) calcium leaching from fractured concrete. These problems can be used to demonstrate simulation tools’ conformance with norms established by the subsurface science and engineering community. In each case, the objective is to present a problem that tests conceptual model capabilities, numerical implementation, process coupling, and accuracy. Each benchmark contribution consists of several cases with gradually increasing complexity. This approach is used to isolate key attributes and the most sensitive parameters of the benchmark problem for higher scrutiny before addressing the full complement of interacting processes, properties, and conditions. The intent is to provide a better basis for resolving discrepancies between code, but should also increase the number of problems that can be attempted by interested modelers.