This book includes the abstracts of 216 papers from 34 countries and other relevant information about CICE 2020/2021 conference. The great contributions of our keynote speakers, invited theme lecturers and all speakers are highly appreciated. The quality of the contributions submitted to CICE 2020/2021 was very high, and as organizers we had the chance to invite more than 100 papers to special collections/issues of ASCE Journal of Composites for Construction, Construction and Building Materials Journal, and Turkish Journal of Civil Engineering based on the suggestions of the reviewers.