This paper presents an overview of the revision of the “Recommendations for Practice of Concrete with Fly Ash” published by the Architectural Institute of Japan (AIJ). In recent years, consideration for environmental aspects have become increasingly important when using fly ash in concrete for construction. The main revisions this time include the introduction of new chapters on the environmental performance of fly ash concrete, the use of fly ash concrete as a measure to suppress chloride ion ingress, and underwater concrete. Additionally, a separate chapter has been dedicated to concrete in which fly ash replaces part of the fine aggregate. In terms of mix design, the section on setting the water-binder ratio using the strength contribution coefficient (k-value) has been enhanced, reflecting research results and practical achievements since the last revision in 2007.

The application of self-compacting concrete is considered a means to enhance productivity in concrete construction; however, issues such as cost and manufacturing complexity have prevented its widespread use in conventional RC structures. To address this issue, we have developed a self-compacting concrete aimed at general use, which minimizes cost increases compared to ordinary concrete. In this paper, we propose a new evaluation test method for this self-compacting concrete and establish a mix design methodology. Furthermore, by applying this concrete to an actual structure, we verified the validity of the mix design methodology and demonstrated that using this concrete can suppress cost increases while ensuring quality and improving productivity through labor reduction.