Report No.	CP2 (jot this number down to order)
Title	Evaluation of Rubber Modified Asphalt Demonstration Projects
Authors	Kennephol, G.J.
Publisher	Ministry of Transportation, Ontario, Canada
Pub. Date	February, 1994
Pages	5
Keywords
Description	Eleven Ontario Demonstration projects (wet and dry processes) were evaluated in terms of pavement performance, environmental impacts, life cycle costs and recyclability. Conclusions are included on performance where the dry process should produce performance equivalent to conventional hot mix and the wet process appears to enhance performance. Air emission testing showed rubber mixes produce higher MIBK (skin and mucus irritant that is moderately toxic but is not considered to be a carcinogen) but other emissions appeared to be the same as for conventional hot mix. Recyclability appears to be feasible but repeated recycling that reduces rubber effectiveness could cause disposal problems. Life cycle costs of rubber mixes appear to be higher than conventional mixes but sufficient time has not elapsed to monitor long term performance which could impact life cycle costs.
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