基于有机-无机改性的赤泥沥青混合料综合性能

doi:10.6040/j.issn.1672-3961.0.2022.137

摘要/Abstract

摘要：

聚焦赤泥的资源化利用与筑路材料紧缺问题，提出采用赤泥替代石灰岩矿粉制备沥青混合料。针对赤泥-沥青界面遇水强度衰减问题，提出无机粉体共混(水泥、消石灰)和有机偶联剂表面修饰(硅烷偶联剂KH-550、KH-560)的改性工艺，并研究改性前后的赤泥对沥青混合料性能的影响规律。通过动稳定度试验、马歇尔试验、汉堡车辙试验、动态模量试验和两点弯曲试验对改性前后的赤泥沥青混合料进行系统评价，发现普通赤泥可以提高沥青混合料的高温稳定性，但是对水稳定性、低温抗裂性与疲劳性能有不利影响。通过对赤泥改性处理，赤泥沥青混合料的高低温性能、水稳定性与长期耐久性均得到不同程度提高，而采用硅烷偶联剂表面修饰改性效果更好。证实了使用赤泥进行沥青混合料生产的可行性，为赤泥的资源化利用开拓了方向。

关键词: 赤泥, 沥青混合料, 改性, 水稳定性, 疲劳

Abstract:

Focused on the issues of red mud utilization and road building material shortage, this paper put forward the research idea of utilizing red mud as the succedaneum of limestone powder to prepare asphalt mixture. Modification methods which included inorganic powder blending (cement, slaked lime) and organic coupling agent surface modification (silane coupling agent KH-550, KH-560) were proposed with the view of solving moisture sensitivity of red mud-bitumen interface, with the influence of modification means on performance of red mud asphalt mixture were also studied. The performance of red mud asphalt mixture before and after modification were systematically evaluated by using dynamic stability test, Marshall test, Hamburg rut test, dynamic modulus test and two-point bending fatigue test. It was found that the red mud could improve the high-temperature performance of asphalt mixture, but had negative effects on the moisture stability, cracking resistance and fatigue life. After red mud modification, the high and low temperature performance, moisture stability and long-term durability of red mud asphalt mixture were improved to varying degrees, and the surface modification effect of silane coupling agent performed better. It was proved the feasibility of using red mud to produce asphalt mixture and provided a new approach for red mud utilization.

Key words: red mud, asphalt mixture, modification, moisture stability, fatigue

中图分类号:

U414

张吉哲,刚子璇,毕玉峰,岳红亚,徐润,丁婷婷,齐仕杰. 基于有机-无机改性的赤泥沥青混合料综合性能[J]. 山东大学学报 (工学版), 2023, 53(1): 1-10.

Jizhe ZHANG,Zixuan GANG,Yufeng BI,Hongya YUE,Run XU,Tingting DING,Shijie QI. Comprehensive properties of red mud asphalt mixture based on organic and inorganic modification[J]. Journal of Shandong University(Engineering Science), 2023, 53(1): 1-10.

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指标	软化点/℃	针入度(25 ℃)/(0.1 mm)	延度(15 ℃)/cm
结果	46.2	68.3	>150
规范要求	≥46.0	60.0~80.0	≥100

粉体种类	比表面积/(m²·g^-1)
矿粉	0.502
赤泥	22.265
消石灰	9.693
水泥	1.538

矿料组成	筛孔尺寸/mm	级配组成/%
集料	15~20	24
	10~15	20
	5~10	21
	3~5	11
	0~3	19
矿粉		5

填料	密度/(g·cm^-3)
矿粉	2.775
赤泥	2.613
消石灰	2.319
水泥	3.210
KH-550改性赤泥	2.587
KH-560改性赤泥	2.598

样品编号	填料组成
AC-LP	石灰岩矿粉
AC-RM	赤泥
AC-RH	m(赤泥)∶m(消石灰)=9∶1
AC-RP	m(赤泥)∶m(水泥)=9∶1
AC-R550	m(赤泥)∶m(硅烷偶联剂550)=100∶1
AC-R560	m(赤泥)∶m(硅烷偶联剂560)=100∶1