What is the correct treatment of mineral matter when using the chemical method for extraction?

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In the chemical extraction method, you must account for all solids that were in the original sample. The asphalt binder is dissolved away by the solvent, leaving the mineral matter behind. To accurately determine the asphalt content, you combine what’s left of the solid material (the extracted aggregate) with the mineral matter that remains. In other words, add the mineral matter mass to the extracted aggregate mass to reconstruct the total solids that were present before extraction. This ensures the calculation uses the full basis (original solids) rather than a partial portion, giving the correct asphalt content.

If you ignored the mineral matter or treated it separately, you’d either understate or misstate the total solids, leading to an incorrect asphalt percentage. Subtracting it would similarly skew the result, since the original mix consisted of both asphalt and mineral matter that together determine the final content.