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dec 15, 2020 coarse aggregate. this is any material larger than 9.m. In southern africa and 13,m are the most common size used for the desired final product. sizes of aggregate in this category are: fine gravel: medium gravel: coarse gravel: cobbles: boulders:during the south african heavy vehicle simulator test program during the resulting in the conclusive proof that a properly constructed crushed stone layer can be used for pavements with a bearing capacity up to million standard axles repetitions.tests were conducted on the blended aggregates using the standard south african sieve sizes described in TM method table shows the grading results of blended aggregates for the five mixes. following the grading analyses, the aggregate samples were riffled until the required number of particles needed for scanning was achieved.