CONMOD2018 is a symposium on Concrete Modelling which is jointly organised by Delft University and Ghent University as part of the RILEM week 2018 in Delft, The Netherlands. The symposium is the 5th in a series dealing with all aspects concerning modelling of concrete at various scales. The symposium consist of 3 key-note papers and 62 regular papers presented over 3 days. Parallel to the CONMOD2018 symposium a conference on Service Life Design (SLD4) and a workshop honouring Professor Klaas van Breugel were organised with topics that are related to concrete modelling. In total more than 350 participants took part in the events organised during the RILEM week 2018.