Early-stage road property improvements of cold recycled asphalt emulsion mixture with microwave technology. (1st August 2020)

• Record Type: Journal Article
• Authors: Wang, Zhenjun; Dai, Nan; Wang, Xiaofeng; Li, Gang; Guo, Haoyan
• Is Part Of: Journal of cleaner production. Volume 263(2020)
• Publication Date: 2020-08-01
• Subjects: Cold recycled asphalt emulsion mixture (CRAEM) -- Microwave radiation time -- Heat treatment methods -- Early-stage road properties; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2020.121451
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Cold recycled asphalt emulsion mixture (CRAEM) is widely used in construction and building materials. However, it is necessary to improve road performance at an early curing age for quickly open traffic. In this work, early-stage road properties (at 3 or 7-day curing age) of CRAEM with different heat treatment method (room temperature treatment, oven treatment and microwave treatment) were investigated and compared. The morphology and demulsification behavior of CREAM were also investigated with environmental scanning electron microscope (ESEM) and optical microscopy. Back propagation (BP) neural networks were used to simulate indirect tensile strength (ITS) of CRAEM after microwave irradiation. The gray correlation analysis (GCA) was used to compare the effects of microwave irradiation time on early-stage road properties of CRAEM. The results show that mechanical property is improved due to microwave irradiation. BP neural network can accurately predict early-stage mechanical properties of CRAEM. Microwave radiation has a positive effect on improving the water stability of CRAEM, but the improvement on TSR of CREAM is limited. The linear model can predict dynamic stability of CRAEM under different microwave parameters. The crack resistance at low temperature by microwave radiation is limited. Microwave radiation not only accelerates cement hydration, but also promotes the demulsification of asphalt emulsion. Microwave radiation has the highest influence on rutting resistance at high temperature and ITS performance of CRAEM; while its effect on water stability and crack resistance at low temperature of CRAEM is relatively less.