Study on the effect and mechanism of microwave excitation on the activity of recycled powder of waste concrete

Yang, Yonggan; Tian, Deyin; Gao, Peng; Zhan, Binggen; Yu, Qijun; Wang, Jingfeng; Wang, Aiguo; Ni, Mingxing; Zhao, Peng; Zhang, Yunsheng; Su, Changbin; Tan, Lei; Ding, Zhaowen

doi:10.1016/j.conbuildmat.2024.136410

Cited by 5 publications

(1 citation statement)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The application of microwave heating technology in pavement engineering can achieve different purposes, such as induction heating and the self-healing of cracks [14,15], as well as improving the early strength of the pavement [16,17], production and recycling of road pavement materials [18] and microwave de-icing [10,19]. The design of microwave-heated pavement is determined by the final purpose.…”

Section: Introductionmentioning

confidence: 99%

Microwave De-Icing Efficiency Improvement of Asphalt Mixture with Structural Layer Optimization and Heat-Resistance Design

Zhang,

Zhou,

Guo

et al. 2024

Materials

View full text Add to dashboard Cite

The application of microwave de-icing technology in road engineering is constrained by its low energy utilization rate, which can be attributed to low heat production rates and ineffective heat dissipation to the underlying pavement. In this work, asphalt mixtures are designed as an upper layer (heating layer) and a lower layer (thermal-resistance layer). Magnetite slag was selected as a microwave-sensitive source for generating heat, and expanded perlite powder was incorporated into the lower layer as a thermal resistance material. Structural layer optimization and thermal-resistance layer design of the asphalt mixture were carried out by changing the thickness of the upper and lower layers to further improve the heat production rates. The design effectiveness is comprehensively evaluated by factors such as the changing law of the average surface temperature of mixtures, ice-melting time, and cost-effectiveness analyses. The results show that EP possesses better thermal stability, lower microwave energy conversion ability and more excellent heat-resistance potential compared with mineral powder. The heat-resistance layer with EP can prevent heat from being conducted to the lower layer and promote it to concentrate on the specimen surface, which can endow the microwave heating efficiency of specimens to be further improved by up to 26.97% and the de-icing time reduced by 10%, ascribed to the heat-resistance design. Furthermore, the collaborative design of the structural layer optimization and heat-resistance layer can increase energy utilization efficiency and save microwave-absorbing materials while ensuring excellent microwave de-icing efficiency.

show abstract