Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (1): 165-173.doi: 10.13229/j.cnki.jdxbgxb20180495

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Road performance experiment of diatomite⁃basalt fiber composite modified asphalt mixture

Chun-feng ZHU1,2(),Yong-chun CHENG2,Chun-yu LIANG2(),Bo XIAO3   

  1. 1. School of Civil Engineering, Jilin Jianzhu University, Changchun 130118, China
    2. College of Transportation, Jilin University, Changchun 130022, China
    3. Changchun Municipal Engineering Design and Research Institute, Changchun 130033, China
  • Received:2018-05-21 Online:2020-01-01 Published:2020-02-06
  • Contact: Chun-yu LIANG E-mail:zcf-mine@163.com;liangcy@jlu.edu.cn

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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

CLC Number: 

  • U416.2

Table 1

Matrix asphalt performance test results"

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 —

Fig.1

Diatomite"

Fig.2

Basalt fiber"

Table 2

Basalt fiber performance index"

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

Fig.3

"

Fig.4

Low temperature splitting test system"

Fig.5

"

Fig.6

Load-deformation curve of splitting test"

Fig.7

Unit section splitting absorption energy"

Fig.9

"

Fig.9

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