In March 2019, the Concrete Committee of the Japan Society of Civil Engineers published a revised version of “Guideline on Design and Application Methods of Galvanized Steel Reinforcement for Concrete Structures”. This latest version updates the previous guideline published in 1980, while introducing the concept of performance design to allow durability design of concrete structures using galvanized steel reinforcement. This paper introduces the content of the main parts of the revised guideline.

The Research Sub-Committee on Precast Concrete Members with Granulated Blast Furnace Slag Fine Aggregate of the Concrete Committee of the Japan Society of Civil Engineers has been conducting research for two years on how to ensure the quality of precast products, in view of the shortage of skilled workers in the near future. The results of this research have been compiled as a Concrete Library No 155. Granulated blast furnace slag, whether used as fine powder or fine aggregate, improves chloride penetration resistance and frost resistance. Especially when used as fine aggregate, granulated blast furnace slag sand (BFS) is known to reduce the time-dependent strain such as drying shrinkage strain and creep. This guideline covers the points that must be kept in regarding design, manufacture, and construction to ensure durable precast products that use to advantage the characteristics of BFS.

JIS A 5011-3 (Slag Aggregate for Concrete─Part 3: Copper Slag Aggregate) , which covers copper slag fine aggregate, a by-product aggregate, was revised in April 2016, and regulations on environmental safety quality were introduced accordingly. As a result, in the Kansai area, where the establishment of a supply system for copper slag fine aggregate will be relatively easy, the Kinki Chapter Research Committee of JCI, the Kinki Chapter Materials and Construction Subcommittee of the Architectural Institute of Japan, and the Technical Committee of the Osaka Hyogo Ready-mixed Concrete Industrial Association have been working together to investigate the setting of use amounts according to the environmental safety quality of copper slag fine aggregate in addition to the characteristics of concrete using copper slag fine aggregate for civil engineering use and for building use, and to conduct surveys and research activities for practical application. This paper reports on the main achievements of each committee regarding concrete using copper slag fine aggregate.