Preparation of Shape-Imitated Lightweight Aggregate and Its Application in Thermal Resistance Asphalt Mixture

doi:10.16552/j.cnki.issn1001-1625.2025.0817

Abstract

Abstract: To address the issue of performance degradation in asphalt mixtures caused by the poor morphology and shape of traditional thermal resistance lightweight aggregates, while promoting the high-value utilization of solid wastes such as fly ash and red mud, this study takes natural aggregates as shape prototypes, designs a molding method for shape-imitated lightweight aggregates, and prepares such lightweight aggregates through the optimization of raw material proportions and temperature regimes. Additionally, their performance and application effects in thermal resistance asphalt mixtures are systematically investigated. Results show that fly ash and red mud have good complementarity in terms of ceramic-forming components, fluxing components, and gas-generating components. The optimal mass ratio of fly ash, 1# red mud, and 2# red mud is 4∶1∶1, and the suitable dosages of cement and water are 5% and 24%, respectively. Based on the morphological transmission pathway from natural aggregate prototype to mold with replicated shape features, and then to shape-imitated lightweight aggregate, lightweight aggregate pellets are shaped. Using a two-stage holding system (30 min at 500 and 900 ℃ respectively) and sintering at 1 175 ℃ for 30 min, high-performance shape-imitated lightweight aggregates are prepared. The apparent density is as low as 1.731 g/cm³, the tube strength exceeds the lower limit of the specification by 20.6%, the abrasion loss is 33.6% lower than the upper limit, the morphology retention rate is not less than 67.5%, and the shape-imitated lightweight aggregates are rich in low-thermal-conductivity plagioclase minerals and porous structures. When the content of shape-imitated lightweight aggregates is 18%, the asphalt mixture exhibits balanced performance. The indirect tensile resilience modulus in the wide temperature range of -15~45 ℃ increases by 5.6%~134.3%. Both water stability and temperature stability are excellent. The thermal conductivity and thermal diffusivity decrease by 29.4% and 45.1%, respectively. During the heating and cooling stages in indoor irradiation test, lightweight aggregates both significantly reduce the temperature change speed inside the samples.

Key words: shape-imitated lightweight aggregate, fly ash, red mud, thermal resistance asphalt mixture, mechanical performance, stability, thermal resistance performance

CLC Number:

TU528.42

XIAO Yue, LI Chao, CHEN Zongwu, WANG Feng. Preparation of Shape-Imitated Lightweight Aggregate and Its Application in Thermal Resistance Asphalt Mixture[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(11): 4147-4161.

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