Outline of AIJ Recommendation for Mix Design, Production and Construction Practice of Concrete with Recycled Concrete Aggregate

Abstract

Architectural Institute of Japan (AIJ) established and published "Recommendation for Mix Design, Production and Construction Practice of Concrete with Recycled Concrete Aggregate" in October 2014 based on the Japan Industrial Standards for recycled aggregate and recycled aggregate concrete. The recommendation shows the standard specifications for the investigation of demolished reinforced concrete structures which become the resource of recycled aggregate and the production and quality control of recycled aggregate. It also recommends the appropriate type of recycled aggregate concrete according to the condition of the part or the component of a building, and prescribes the mix proportioning, production technique, transportation method, execution technique, quality control method for recycled aggregate concrete. In the appendices, lists of recycled aggregates and recycled aggregate concretes certified by the Japanese government are shown, and typical application cases of these recycled aggregate concretes to buildings are outlined. 1. INTRODUCTION In view of the large environmental loads of reinforced concrete buildings throughout their lifecycle, the Architectural Institute of Japan (AIJ) published the Recommendation for Environment-friendly Construction of Reinforced Concrete Structures in 2008 with the aim of working life extension, energy saving, resource conservation, resource circulation, etc., of reinforced concrete buildings. However, these Recommendation do not include methods and procedures of utilizing recycled aggregate (RA) for concrete. A subcommittee for studying recycled aggregate concrete (RAC) was therefore organized in AIJ, and after four years of activities, Recommendation for Design, Production, and Placement of Concrete Containing Recycled Aggregate (hereafter referred to as the Recommendation for RAC) were established and published in October 2014. These Recommendation for RAC show desirable methods of investigating demolished reinforced concrete buildings, which are the sources of the materials for RA, and methods of production and quality control of RA. The Recommendation also propose the types of RAC recommended for respective segments and members of buildings, describing desirable methods of proportioning, production, transportation, placement, and quality control. Also, the appendix