Abstract
water stability of warm mix asphalt mixture based on foamed asphalt is the key evaluation index affecting its road performance. The moisture content in the production process of foamed asphalt is unfavorable to the water stability of warm mix asphalt mixture. In order to improve its water stability, through immersion Marshall test and freeze-thaw splitting test, taking foaming effect, asphalt temperature, foaming water consumption and polymer fiber content as influencing factors, the control variable method is used to study and analyze the influence of factors on the water stability of warm mix asphalt mixture. The test results show that the foaming effect of asphalt, asphalt temperature, foaming water consumption and fiber content are the direct factors affecting the water stability of warm mix asphalt mixture. According to the importance analysis of random forest variables, foaming water consumption, foaming effect and asphalt temperature are the most important variables, while fiber content is the least. Taking the asphalt used in this paper as an example, it is suggested to improve the water stability of warm mix asphalt mixture with the combination of the best foaming effect, asphalt temperature 155 °C, foaming water consumption 2% and fiber content 0.3%.
Highlights
Compared with hot mix asphalt mixture, warm mix asphalt mixture has the advantages of saving resource consumption and reducing environmental pollution; compared with cold mix asphalt mixture, warm mix asphalt mixture can significantly improve pavement performance
Asphalt temperature has a strong correlation with the foaming effect of foamed asphalt and the mixing of warm-mix asphalt mixture, which directly restricts the mechanical properties of warm-mix asphalt mixture
The random forest algorithm is completed by the statistical language R, with the four influencing factors of A asphalt foaming effect, B asphalt temperature, C foaming water consumption, and D fiber content as input variables
Summary
Compared with hot mix asphalt mixture, warm mix asphalt mixture has the advantages of saving resource consumption and reducing environmental pollution; compared with cold mix asphalt mixture, warm mix asphalt mixture can significantly improve pavement performance. The warm mix process based on foamed asphalt does not need to add additives It is completely physical reaction, low cost and mature technology. Asphalt foaming effect, foaming water consumption, mixing temperature and additive type all have different degrees of water stability of warm mix asphalt mixture. Wang Fu [5] used Sasobit LM and Honeywell titantm to prepare warm mix asphalt mixture, and studied the correlation between anti loose performance and water stability of warm mix asphalt mixture. Huang Chuan [7] used orthogonal test to evaluate the influence of rap content, warm mix agent content, mixture particle size and other factors on the water stability of warm mix recycled asphalt mixture. Residual stability and freeze-thaw splitting tensile strength ratio were used to evaluate the water stability of the mixture, so as to provide feasible technology for the study of water stability of warm mix asphalt mixture. support
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