硅藻土⁃玄武岩纤维复合改性沥青混合料路用性能试验

doi:10.13229/j.cnki.jdxbgxb20180495

摘要/Abstract

摘要：

针对吉林省季节性冻土区对沥青路面高温稳定性和低温抗裂性的要求，在沥青混合料中同时掺加硅藻土和玄武岩纤维，通过对复合改性沥青混合料低温稳定性、高温稳定性、水稳定性和疲劳性能等性能指标进行研究，评价硅藻土玄武岩纤维复合改性沥青混合料的路用性能，为硅藻土-玄武岩纤维复合改性沥青混合料在沥青路面中的应用提供参考。研究结果表明：硅藻土-玄武岩纤维复合改性沥青混合料具有良好的路用性能，掺加硅藻土和玄武岩纤维后沥青混合料的高温稳定性显著提高，低温抗裂性得到改善，疲劳寿命得到大幅提高，水稳定性也有一定程度的提高。

关键词: 道路工程, 硅藻土, 玄武岩纤维, 复合改性沥青混合料, 路用性能

Abstract:

In order to meet the requirement of high temperature stability and low temperature crack resistance of asphalt pavement in seasonal frozen soil region of Jilin Province, in this research the diatomite and basalt fiber are simultaneously added into asphalt mixture. Then through the analyses of high temperature stability, low temperature stability, water stability and fatigue properties of compound modified asphalt mixture, the pavement performance of diatomite-basalt fiber composite modified asphalt mixture is evaluated. The results show that the diatomite-basalt fiber composite modified asphalt mixture has good road performance, can significantly improve the high temperature stability of the asphalt mixture, and effectively improve the low temperature crack resistance of the asphalt mixture. The fatigue life of asphalt mixture is greatly improved and the water stability is improved to some extent.

Key words: road engineering, diatomite, basalt fiber, composite modified asphalt mixture, road performance

中图分类号:

U416.2

朱春凤,程永春,梁春雨,肖波. 硅藻土⁃玄武岩纤维复合改性沥青混合料路用性能试验[J]. 吉林大学学报(工学版), 2020, 50(1): 165-173.

Chun-feng ZHU,Yong-chun CHENG,Chun-yu LIANG,Bo XIAO. Road performance experiment of diatomite⁃basalt fiber composite modified asphalt mixture[J]. Journal of Jilin University(Engineering and Technology Edition), 2020, 50(1): 165-173.

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指标	试验结果	规范要求
软化点T _R＆B/℃	46.9	≥45
粘度(135 ℃，mPa·s)	306.9	—
针入度(25 ℃，0.1 mm）	91.8	80-100
延度(15 ℃，cm）	＞150	≥100
密度(15 ℃,g/cm³)	1.016	—

指标	规范要求	测试结果
长度/mm	6	—
直径/μm	10~13	—
线密度/Tex	2 400±120	2 398
断裂强度/(N?tex^-1)	≥0.40	0.55
拉伸弹性模量/GPa	≥85	86.3
抗拉强度/MPa	≥2 000	2 320
断裂伸长率/%	≥2.5	2.84
可燃物含量/%	—	0.56
吸水率/%	≤0.2	0.030