Bitumen and bituminous binders. Determination of acid number of bitumen. Potentiometric method1 Scope This document describes a method for the determination of the free acidic constituents present in bitumen, conventionally known as acid number. WARNING The use of this document may involve hazardous materials, operations and equipment. This document does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this document to establish appropriate safety and health practices and to

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