Evaluation of heat of hydration, temperature evolution and thermal cracking risk in high-strength concrete at early ages

• Published in: Case studies in thermal engineering 2020-10, Vol.21, p.100658, Article 100658
• Main Authors: Do, Tu Anh, Hoang, Tuyet Thi, Bui-Tien, Thanh, Hoang, Hai Viet, Do, Tuan Duc, Nguyen, Phan Anh
• Format: Article
• Language: English
• Subjects: Adiabatic temperature rise; Early-age thermal cracking; Heat of hydration; High-strength concrete; Hydration parameters; Thermal stress
• ISSN: 2214-157X; 2214-157X
• DOI: 10.1016/j.csite.2020.100658

Adiabatic temperature rise (ATR), early-age strength development for a normal-strength concrete (NC) and a high-strength concrete (HSC) mixes widely used in bridge construction were experimentally determined. The hydration parameters and the heat of hydration of the two concrete mixes were compared. The temperature and developments and early-age cracking risk in a bridge pier using NC and HSC were then evaluated. The results show that when replacing NC with HSC, the pier cross section could be reduced by 35%, however, the temperature difference was slightly greater and the thermal cracking was very high. To effectively use HSC with a minimal cracking risk, the concrete should be covered with insulation materials during construction. The study is of great significance to notice the engineers to take special measures in the design and construction of modern concrete materials (e.g., high-strength and high-performance concrete) for minimizing risk of cracking in the structures and optimizing the construction schedules. •Adiabatic temperature rises of normal and high-strength concretes were compared.•HSC with reduced cross section developed slightly higher temperature than NC.•HSC pier with reduced cross section had much higher cracking risk than NC one.•Measures (e.g., insulation) must be taken during construction of HSC structures.