Road American
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Aggregate surface charge and mineralogy control how quickly an emulsion breaks and how strongly residue bonds. Many siliceous aggregates are acidic and tend to bond better with cationic emulsions that carry positive charge, producing faster break and stronger adhesion. Limestone and other basic aggregates can work well with anionic emulsions, depending on the system and additives. Water chemistry and dust also matter: clay contamination can cause unpredictable break. The correct practice is to run coating and breaking compatibility tests with your local aggregates before locking a grade for production procurement.
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