Research on the Application and Environmental Impact of Foamed Warm-mix Asphalt Mixture in Maintenance Engineering
Foamed warm-mix asphalt technology has been rapidly developed and applied in recent years.In the paper,studies are carried out focusing on the optimal foaming conditions of mechanical foaming,mixture design,maintenance engineering application and quantitative evaluation of environmental impact.The results show that the optimal foaming conditions for road asphalt No.70 are asphalt temperature of 160℃ and water consumption of 2％.The pavement performance of foamed warm-mix Sup-20 mixture is basically the same as that of hot mix asphalt mixture.Under the condition of lowering the temperature of 30℃,the foamed warm-mix Sup-20 mixture has good construction workability.According to the field measurement,the smoke emission of foamed warm-mix Sup-20 is reduced by more than 50％.Using the life cycle assessment method,the foamed warm-mix Sup-20 mixture saves 10.6％energy and reduces greenhouse gas emissions by 12.1％compared with the hot mix Sup-20 mixture.
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