;Due to limited natural resource in Taiwan, the reclaimed asphalt is, therefore, chosen as a raw material that the country could reuse in road pavement. Since 1996, the government of Taiwan has pursued a project of recycling reclaimed asphalt. However, according to The Chapter Outline Section, published by Public Construction Commission, Executive Yuan, it has a stipulation that the maximum quantity of reclaimed asphalt pavement (RAP) added is 40%, and thus the rest of the RAP cannot be used in the asphalt pavement. Besides this, the local governments have urged the Road-Smoothing Project actively. As a result, the project significantly increases the quantity of RAP after road maintenance, causing environmental pollution.
Based on the foamed bitumen stabilization technique, this paper examines whether the recycled asphalt with the mixing of foam bitumen would be suitable and applicable in Taiwan by using RAP as the base layer of the pavement. The result of this study shows that, after foamed asphalt effectiveness test, RAP would not only meet the industry legislation in Taiwan, but also provide superior quality compared with bitumen treated base and natural aggregate. In terms of the production process, the carbon emission of hot mix asphalt (HMA) is 109.91 times greater than the carbon emission of cold mix asphalt (CMA). In addition, HMA energy cost per ton is up to 55.32 times higher than the cost of CMA. From a perspective of production material, the carbon emission of HMA material is also more than CMA materials by 26 percent. What is more, the cost of HMA material per ton is 2.04 times more than what CMA material costs.
According to the effectiveness and efficiency test, which conducted by the laboratory where the researcher worked, the foamed asphalt base could be used in the base layer of the pavement to reduce the cost and the carbon emission.