Most of the research conducted in the Concrete Laboratory is directly related to PhD-research on one of the two research lines of ‘Assessment of existing structures’ or ‘Application of new types of concrete’. A PhD student investigates one topic for a period of four years. During that time experiments can be performed in order to investigate a phenomenon or failure mechanism. In addition to that, the PhD student has time to analyse data thoroughly and make a model to explain the experimental results in a better or more comprehensive way. Sometimes finite element models are used, but also analytical or physical models are developed. Furthermore, PhD students work on their personal development via a training program of the Graduate School of TU Delft.