"Multi-scale transport modelling and its application to the service life prediction of concrete structures"
Who: Ye Guang, TU Delft
Place: Donostia International Physics Center
Date: Thursday, 29 November 2018, 12:00
Cement-based materials are the most widely used man-made materials in the world. The durability of cement-based materials has been a major concern due to the premature failure and serviceability issues of many reinforced concrete structures. Durability of cement-based materials is to a large content dependent on their resistance to the ingress of aggressive species, such as chloride, sulfates and carbon dioxide, which is governed by different mechanisms including permeation, absorption, diffusion, or their combinations. Therefore, the primary factors governing the durability of reinforced concrete structures are the transport properties in cement-based materials, e.g. permeability and diffusivity, which depend on the evolution of their underlying microstructures over a wide range of length scales, concentration of aggressive species and environmental conditions, such as temperature, humidity and their variations. In this lecture a multiscale modelling scheme to estimate the transport properties in cement-based materials (MMTC model) is introduced. The MMTC model can capture the structural information at each scale and taking into account the influences of w/c ratio, time, chloride binding, degree of water saturation, chloride concentration, interfacial transition zone (ITZ), and aggregate content and shape. In general, chloride-induced corrosion of steel rebars in the concrete is considered to be one of the major causes of deterioration in reinforced concrete structures. The potential applications of the MMTC model for predicting the service life of reinforced concrete structures induced by chloride ingression is demonstrated and compared to the DuraCrete model.
Host: Jorge Sánchez Dolado