If you are making hollow core plank, you must be in a plant that routinely makes that type of product.
If this is true, join or contact the PCI for technical assistance and the manufactured of the extruder (if it is extruded). If it is wet cast, this may not be an option and your best sources would be the strand supplier and the PCI.
It sould not be necessaey to wash and baby strands because of the limitation of the strand supplier to provide a usable product.
When it comes to material specifications, ASTM standards really only guidelines. Even if a material meets the loose ASTM requirements it may not be, it may not be suitable for your situation. Particle size, shape and physical properties are very important and the handling of the aggregate can degrade the properties of some aggregates between the sampling and use locations. Factory operations require far more sophistication, uniformity and quality control than field or ready-mix applications.
Dick