--> Figure 7. After abrasion.

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Figure 7. After abrasion. Breakdown trends in the samples are apparent under ESEM. Exposed cement between the grains in the aggregates is preferentially abraded so that, after abrasion, samples in the 500-1000 micron range appear to be much knobbier; with constituent grains protruding excessively out of a reduced cement matrix (see inset).