仿形轻骨料的制备及在热阻式沥青混合料中的应用

doi:10.16552/j.cnki.issn1001-1625.2025.0817

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (11): 4147-4161.DOI: 10.16552/j.cnki.issn1001-1625.2025.0817

仿形轻骨料的制备及在热阻式沥青混合料中的应用

肖月^1,2, 李超^2,3, 陈宗武^1,4, 王凤¹

1.长安大学材料科学与工程学院,西安 710061;
2.武汉理工大学硅酸盐科学与先进建材全国重点实验室,武汉 430070;
3.潮州三环集团有限公司成都研究院,成都 610036;
4.中国地质大学(武汉)工程学院,武汉 430074

收稿日期:2025-08-11 修订日期:2025-09-14 出版日期:2025-11-15 发布日期:2025-12-04
通信作者: 陈宗武,博士,副教授。E-mail:chenzw@cug.edu.cn
作者简介:肖月(1986—),男,博士,教授。主要从事低环境负荷高韧性道路工程材料方面的研究。E-mail:xiaoy@chd.edu.cn
基金资助:
国家自然科学基金项目(52378460,52408455);海南省重点研发计划(ZDYF2023GXJS147);长安大学中央高校基本科研业务费资助项目(300102314301,300102315101)

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

XIAO Yue^1,2, LI Chao^2,3, CHEN Zongwu^1,4, WANG Feng¹

1. School of Materials Science and Engineering, Chang'an University, Xi'an 710061, China;
2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;
3. Chengdu Research Institute of Chaozhou Three-Circle (Group) Co., Ltd., Chengdu 610036, China;
4. Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China

Received:2025-08-11 Revised:2025-09-14 Published:2025-11-15 Online:2025-12-04

摘要/Abstract

摘要： 为解决传统热阻轻骨料形态不佳导致的沥青混合料性能劣化问题,并促进粉煤灰、赤泥等固废的高值化利用,本研究以天然骨料为形态原型,设计仿形轻骨料成型方法,优化原材料配比与烧结温度制度,制备出仿形轻骨料,并系统研究其性能及在热阻式沥青混合料中的应用效果。结果表明,粉煤灰和赤泥在成陶、助熔和产气组分上具有良好互补性,粉煤灰、1#赤泥、2#赤泥的最佳质量配比为4∶1∶1,水泥和水的适宜用量分别为5%和24%。基于“天然骨料原型-复刻形态特征模具-仿形轻骨料”形态传递路径成型轻骨料,采用两阶段保温制度(500和900 ℃下各保温30 min),于1 175 ℃烧结30 min,可制得性能优异的仿形轻骨料:表观密度低至1.731 g·cm^-3,筒压强度超出规范下限20.6%,磨耗损失低于规范上限33.6%,形态保持率不低于67.5%,且富含低导热的斜长石矿物和孔隙构造。仿形轻骨料掺量为18%时,沥青混合料的性能比较均衡:-15~45 ℃宽温域内的间接拉伸回弹模量提升了5.6%~134.3%;水稳定性与温度稳定性均优良;热导率与热扩散率分别减小了29.4%和45.1%,在室内辐照试验的升降温阶段,轻骨料均显著降低了试件内部温度的变化速率。

关键词: 仿形轻骨料, 粉煤灰, 赤泥, 热阻式沥青混合料, 力学性能, 稳定性, 阻热性能

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

中图分类号:

TU528.42

肖月, 李超, 陈宗武, 王凤. 仿形轻骨料的制备及在热阻式沥青混合料中的应用[J]. 硅酸盐通报, 2025, 44(11): 4147-4161.

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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仿形轻骨料的制备及在热阻式沥青混合料中的应用

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

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