New Method Manufacturing High-Quality Recycled Aggregates by Mechanical Grinding

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Title: New Method Manufacturing High-Quality Recycled Aggregates by Mechanical Grinding

Author(s): K. Yoda, A. Shintani, F. Sakuramoto, and K. Aoki

Publication: Special Publication

Volume: 235

Issue:

Appears on pages(s): 203-216

Keywords: carbon dioxide emission; cost; energy consumption; grinding equipment; recycled aggregate

Date: 3/22/2006

Abstract:
Recycled aggregates manufactured on a trial basis with newly developed mechanical grinding equipment was evaluated in terms of quality, cost and carbon dioxide gas emission when applied to a construction site. For practical reasons, recycled aggregate processing rate was assumed to be 30 ton per hour. The recycled coarse aggregate met the quality requirements for structural concrete specified in JIS A 5308, while recycled fine aggregate satisfied a tempered specification. The proposed recycling system resulted in a 1.6 times higher estimated cost than the conventional systems, while further curtailment is possible with a more precise analysis. Estimated carbon dioxide emission was reduced 10 percent compared with conventional systems, contributing to reduction of environmental burdens.