JIS A 5021:2018规定了H级混凝土用再生骨料（以下简称再生骨料H），该再生骨料是通过对因建筑物拆除等原因产生的混凝土块进行高水平处理（如破碎、研磨和分类）制成的。

JIS A 5021:2018 specifies the recycled aggregate for concrete class H (hereafter referred to as recycled aggregate H) manufactured by giving high level treatment such as crushing, grinding and classification to the concrete lumps generated as a result of, for example, demolition of a building.