Revision of JIS A 5308 (Ready-mixed Concrete):2014
By Y. Tsuji, S. Shirokuni and Y. Itoh
Concrete Journal, Vol.52, No.8, Aug. 2014
- Synopsis
- This paper describes the history and background of revisions of JIS A 5308 (Ready-mixed Concrete) standard and explains the major amendments mentioned below. This latest revision of JIS A 5308 prescribes a framework that allows producers to use "recovered aggregate" collected from the newly defined "returned concrete" without consulting purchasers, and it adds ground granulated blast furnace slag and silica fume to the environmental label of "recycled materials" newly established in the 2011 addendum (revision), in the aim to promote the reduction of environmental loads. Furthermore, the normative reference for mixers has been changed from the old 1994 edition to the 2010 revised edition, and terminology changes have been made. Finally, this paper mentions also matters that were issues during deliberations, namely international harmonization with the ISO standards, advanced use of sludge water with solid content greater than 3%, and traceability.
- Keywords:
- ready-mixed concrete, revision of JIS A 5308, recovered aggregate, returned concrete, recycled materials, mixer standard, international harmonization
