8. Procedure 实验步骤
8.1 Wash the sample over the sieve designated for determination of fractured particles to remove any remaining fine material, and dry to constant mass. Determine the mass of the test sample, and any subsequent determinations of mass, to the nearest 0.1 % of the original dry sample mass.
8.2 Spread the dried test sample on a clean flat surface large enough to permit careful inspection of each particle. To verify that a particle meets the fracture criteria, hold the aggregate particle so that the face is viewed directly. If the face constitutes at least one quarter of the maximum cross-sectional area of the rock particle, consider it a fractured face.
8.3 Using the spatula or similar tool separate into two categories: (1) fractured particles based on whether the particle has the required number of fractured faces, and (2) particles not meeting the specified criteria. Use Figs. 2-7 to aid in this determination. Be aware that some of the particles in Figs. 2-4 do show more than one fractured face. If the required number of fractured faces is not given in the applicable specifications, the determination will be made on the basis of a minimum ofone fractured face.
8.4 Determine the mass or count of particles in the fractured particle category and the mass or count of the particles not meeting the specified fracture criteria. Use mass to calculate percent fractured particles unless percentage by particle count is specified.
8.5 If more than one number of fractured faces is specified (for example, 70 % with one or more fractured faces and 40 % with two or more fractured faces), repeat the procedure on the same sample for each requirement.