SELECTION METHOD FOR ULTRAHIGH STRENGTH CONCRETE AGGREGATE

摘要

PROBLEM TO BE SOLVED: To efficiently obtain aggregate suitable for obtaining ultrahigh strength concrete.;SOLUTION: A selection method for ultrahigh strength concrete aggregate includes steps of: collecting five or more crushed-stone samples from raw aggregate in a quarry; providing a cut plane to each of the samples; producing a polished surface by polishing the cut plane; measuring a unit damage resistance load (N/μm) of the polished surface of each of the samples by a method of using a micro-hardness tester in compliance with ISO 14577 to put an indenter into a region 2 mm or more distant from an edge of the cut plane; determining an average unit damage resistance load by averaging the measured values of all the samples; and, when the average unit damage resistance load is 1.0 to 1.7 N/μm, selecting aggregate obtained from the raw aggregate similar to the crushed-stone samples collected in the quarry as ultrahigh strength concrete aggregate.;COPYRIGHT: (C)2013,JPO&INPIT