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5. Binders <strong>AAPA</strong> <strong>2011</strong> <strong>Study</strong> <strong>Tour</strong> Group ReportManufacture of CRBOnly the preblend or ‘wet’ method is utilised in RSA for blending CRB for use in both spray sealingand asphalt. Blending of the CRB is also done closest to the point of use. High speed mixingtechnology is used to blend the rubber crumb with bitumen which is super heated to 210°C priorto digestion. The blend is digested for a minimum of 45 minutes and the maximum self life atspraying or mixing temperature is 6 hours. The blended CRB is either digested in the sprayer or acompartmented tank. Both the sprayers and compartmented tank have belly augers to agitate theCRB.Schematic of a typical high speed CRB blenderSource: Sabita Manual 19Compartment CRB tank and central discharge pointV4-2 Page 51
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