What is the whole procedure from start to finish?
A. (i) Wet System With the wet system a finer rubber crumb (30 mesh) is added either at the asphalt cement terminal or with an on-site mixer set up. A finer crumb is preferable as it will stay in suspension better than a coarser crumb. Usually when we off load asphalt cement with the rubber crumb, we circulate continuously at the asphalt plant. We add up to 12% of this rubber crumb into the asphalt cement (this is by volume and not by weight). If on-site mixing is done, the temperature of the asphalt cement should be at 1770C rather than the normal temperature of 1600C. It should be noted that with the addition of rubber into the asphalt cement, the viscosity changes from 500 centi-poise to around 35 centi-poise. This asphalt cement mixture is then added at the asphalt cement into the aggregates in the same method as conventional mixes. (ii) Dry System With the dry system, rubber crumb 2 to 2.5 mm (4 to 10 mesh size) is added at the asphalt plant. This rubber crumb is added directly to
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