Comparative of emissions from production and construction of hot mix and warm mix asphalt pavement(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2020年1期
- Page:
- 30-39
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Comparative of emissions from production and construction of hot mix and warm mix asphalt pavement
- Author(s):
- QIU Yanjun1; 2; LUO Haoyuan1; 2; ZHANG Jiakang1; 2; LENG Huikang1; 2; AI Changfa1; 2
- 1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China;
2. Key Laboratory of Highway Engineering of Sichuan Province, Southwest Jiaotong
University, Chengdu 610031, Sichuan, China
- Keywords:
- road engineering; asphalt pavement; warm mix additive; emission reduction; construction temperature; emission from construction discharge
- PACS:
- -
- DOI:
- -
- Abstract:
- To quantify the emission reduction effect of warm mix additives, field research was carried out on the production and construction of hot mix and warm mix asphalt pavement and three typical test environments, namely, “mixing station discharge” “openair general road paving” and “tunnel paving”, were selected for air sampling. Nine substances (CO, CO2, H2S, SO2, NOx, PM2.5, PM10, Benzoapyrene (BaP, volatile organic compounds, a primary carcinogen), and asphalt smoke (also carcinogen)) were selected as characteristic emissions for quantitative analysis. The results were compared with the harmful concentration limit values and the test results of similar studies. The results show that the warm mix additive is selected by the project can effectively reduce the mixing and compaction temperature of a mixture by
20 ℃, at the same time as the above three test environments, the warm mix additive reduces the concentration of the nine emissions by averages of 28.6%, 20.8%, and 26.4%, respectively, making the excessive CO concentration in the “mixing station discharge” environment and the excessive asphalt smoke concentration in the “tunnel paving” environment satisfy the limit value. The warm mix additive has the best emission reduction effect on the carcinogen BaP (reduced by more than 40%) and asphalt smoke (reduced by more than 30%), followed by gaseous emissions CO, CO2, SO2, and NOx, However, for H2S, PM2.5, and PM10, no significant emission reduction effects are observed. A comparison with similar studies shows that the carbon dioxide emission reduction effect has the highest correlation with the temperature drop, and the emission of SO2 is related to the acidity and alkalinity of the aggregate in addition to temperature. The emission reduction effect of NOx comes from the saving of heating fuel and the reduction of heating temperature of asphalt also leads to the weakening of the volatilization of BaP. Furthermore, the warm mix additive can effectively reduce the discharge of the asphalt mixture in construction and production.
Last Update: 2020-01-17