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The T31 laboratory test method is used to quantify the adhesion between a bituminous binder dosed with adhesion agent and a mineral aggregate. The use of adhesion agents is mandatory in cutback bitumen sued for chip sealing and T31 provides a process to optimise the dosage rate of adhesion agents in binders.

The areas covered by the method include:

• materials and apparatus required
• testing procedures—two alternatives are described
• reporting requirements.

T31 is a new specification.