2021 International Civil Engineering and Architecture Conference (CEAC 2021) was held online during March 11-14, 2021. Due to the evolving public health concerns and travel advisories issued for the avoidance of non-essential travel in view of COVID-19, the conference CEAC 2021 has been held virtually hosted on Zoom video conference platform. It was a fully synchronized online conference that had live Q&A, participants jointly listened to presentations, and attended other live events associated with the conference.Scientists from China, Indonesia, Thailand, Qatar, Pakistan, Japan, and so on took part in the scientific forum. And for plenary speech, each plenary speech lasted for 40 minutes, including 5 minutes for Q&A while for other sessions, there was 15 minutes for each presentation, including 2 minutes for Q&A. The interaction session was real experience to the participants and they had good exposure with foreign researchers, students and other delegates.The objective of CEAC was to provide a platform for engineers, scientists and industrial partners to discuss and disseminate recent research findings in wide aspects of theoretical, experimental, and practical civil engineering and architecture fields. Professionals, experts, and scholars from various engineering disciplines were invited to share experiences, innovations, achievements and knowledge. The conference brought together academics, researchers, and practitioners with the aim of bridging the gap between theory and practice in all civil engineering aspects. All papers in this proceeding were subject to peer-review by conference committee members and international reviewers. The papers were selected for the proceedings based on quality and relevance to the conference.We express our gratitude to the Organising Committee for its valuable contribution to this successful edition of CEAC 2021. We also express our sincere gratitude to all people who contributed to the review process and did all their best to enhance the scientific merit and quality of the Proceedings. We are also grateful to the authors for their contributions, to the speakers and participants of the CEAC 2021. We wish to extend our warmest welcome to all interested participants to the next CEAC 2022. We also address thanks to all those involved in organising this edition of the conference, as well as to IOP Conference Series: Materials Science and Engineering.List of CEAC Committees, Conference Chairs, Program Chairs, Publicity Committee, Technical Committees are available in this pdf.