Title: Technical Committee on Aggregate Qualities and Effective Use of Poor Quality Aggregates

Author(s): Katsuro KOKUBU, Shigeyuki SOGO, Hirotaka KAWANO, Takafumi NOGUCHI, Makoto HISADA, Ryuichi CHIKAMATSU

Publication: JCI

Volume:

Issue:

Appears on pages(s): 1-16

Keywords: Aggregate, aggregate quality, performance of concrete, standards

DOI:

Date: 7/1/2007

Abstract:
Amid the demand for various performances of concrete, deterioration in the quality of aggregate has been posing problems, while the effective use of natural resources has been a significant issue facing society. With this as a background, the Committee clarified the actual state of the deterioration of aggregate qualities, particularly regarding fines in crushed rock, grading, and absorption, by a questionnaire survey to aggregate manufacturers and users, with the aim of making efficient use of limited resources for concrete while ensuring its qualities. The relationship between the aggregate qualities and concrete performances was then organized, based on which the Committee summarized the problems of the current standards and proposed a concept of future quality specifications for aggregate.