Journal of Jilin University(Engineering and Technology Edition) ›› 2026, Vol. 56 ›› Issue (9): 2317-2328.doi: 10.13229/j.cnki.jdxbgxb.20250164

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Preparation of hybrid fiber⁃modified asphalt and reinforcement and toughening mechanism

Lu-chuan CHEN1(),Kai ZHANG2,Liang WANG1,Xiao-kang ZHAO2,Jiu-peng ZHANG2(),Ming WANG2,Yin-zhang HE2   

  1. 1.Shandong Expressway Group Co. ，Ltd. ，Jinan 250032，China
    2.School of Highway，Chang'an University，Xi'an 710064，China
  • Received:2025-02-25 Online:2026-09-01 Published:2026-09-07
  • Contact: Jiu-peng ZHANG E-mail:17671698242@chd.edu.cn;jiupengzhang@chd.edu.cn

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Abstract:

To study the mechanism of hybrid fiber enhancement of asphalt toughening， calcium sulfate whisker and basalt fiber hybrid fiber reinforced asphalt materials were prepared. The temperature scanning test of dynamic shear rheometer， multiple stress creep recovery test， and scanning electron microscope test and other tests were conducted to analyze the the effects of hybrid fibers on asphalt rheological properties， microstructure， etc. The results show that both calcium sulfate whisker and basalt fiber can significantly improve the high-temperature stability of asphalt binder， and the effect of calcium sulfate whisker is especially prominent； when the content of calcium sulfate whisker is 5% and the content of basalt fiber is 1.0%， the failure temperature of hybrid fiber-modified asphalt is improved by about 19.58% compared with that of matrix asphalt. However， calcium sulfate whisker is detrimental to the flexibility performance at low temperatures， and the addition of basalt fiber can effectively alleviate the excessive hardening problem caused by calcium sulfate whisker. In addition， the temperature sensitivity of asphalt increased and then decreased with the increase of basalt fiber proportion， and reached the optimal equilibrium point when the basalt fiber doping was 1%. Scanning electron microscope analysis confirmed that calcium sulfate whisker had good dispersion and compatibility in asphalt， and that basalt fiber mainly played the role of toughening in the system.

Key words: road engineering, modified asphalt, calcium sulfate whisker, basalt fiber, hybrid fiber, rheological property

CLC Number: 

  • U414

Table 1

Technical index of Donghai 90# base asphalt"

技术指标试验值规范要求试验方法
针入度（25 °C）/0.1 mm8480~100T0604
软化点（环球法）/°C46.3≥45T0606
延度（10 °C）/cm24≥20T0605
密度（15 °C）/（g·cm-3）1.032—T0603
蜡含量/%1.91<2.2T0615

Table 2

Basic physical indexes of anhydrous CSW"

指标数值与描述单位
外观白色粉末—
松散密度0.15~0.3g/cm
密度2.69g/cm
直径1~15μm
平均长度20~35μm
长径比20~35—
莫氏硬度3—

Table 3

Basic technical indexes of basalt fiber"

参数数值单位
长度6mm
直径15μm
密度2.64g/cm
拉伸强度3 000MPa
弹性模量65.2GPa
断裂伸长率2.58%
熔点79.1°C
质量损失（热稳定性）0.47%
吸湿率（水稳定性）0.8%
吸油倍数（吸油性）6.048—

Table 4

Types of modified asphalt"

沥青类型CSW掺量/%BF掺量/%
DH~90#（基质沥青）00
0%BF（加入矿粉）00
5%CSW50
1.0%BF01.0
5%CSW+0.4%BF50.4
5%CSW+1.0%BF51.0
5%CSW+1.6%BF51.6

Fig.1

Relationship between complex shear modulus and phase angle versus temperature"

Fig.2

Relationship curve between rutting factor and temperature"

Fig.3

Curve of shear strain of asphalt with time under different loads"

Fig.4

MSCR test results"

Table 5

Matrix asphalt equivalent viscosity"

温度/℃兰氏温度/°R剪切模量/Pa相位角/（°）剪切黏度/（Pa?s）lg（η*）/（Pa?s）lg（lg（η*））/（Pa?s）
30545.67170 90071.8721 891.891 894.340 2830.637 518
40563.6746 12776.045 336.675 7683.727 2710.571 391
50581.6712 89580.311 382.830 4963.140 7690.497 036
60599.673 102.584.40317.552 193 62.501 8150.398 255
70617.67900.2386.8990.670 524 861.957 4660.291 694
80635.67291.8388.4429.235 654 61.465 9130.166 108

Fig.5

Main curve of frequency scanning"

Fig.6

S value of bending creep stiffness modulus of various asphalts at different temperatures"

Fig.7

m value of bending creep rate of various asphalts at different temperatures"

Fig.8

Distribution of whiskers in CSW modified asphalt"

Fig.9

Fiber distribution in BF modified asphalt"

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