Overview of the 2025 Revision of the Guidelines for Control of Cracking of Mass Concrete
By T. Mizobuchi, S. Miyazawa, M. Ishikawa, M. Kojima, S. Asamoto and K. Yokozeki
Concrete Journal, Vol.64, No.4, Apr. 2026
- Synopsis
- Nearly nine years have passed since the Guidelines for Control of Cracking of Mass Concrete were last revised in 2016. Accordingly, the Committee for Preparing the Draft Revision of the Guidelines has been working on the 2025 revision since FY2022. In this latest revision, the Guidelines are organized into three parts: Main Part, Thermal Crack Control, and DEF Crack Prevention; the applicable scopes of thermal cracking and DEF cracking are clearly specified, and in principle, thermal cracking assessment (verification) is to be conducted based on the probability of crack occurrence. In addition, based on results of analyses conducted using the thermal stress analysis software (JCMAC3) proposed by the Committee for Promoting Mass Concrete Software, the revision proposes a new method for estimating thermal crack width and a simplified evaluation method for a new thermal cracking index.
- Keywords:
- Mass concrete, Thermal cracking, DEF cracking, Crack control, Crack assessment (verification)
