Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (1): 220-225.doi: 10.13229/j.cnki.jdxbgxb20210541

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Mixing power test and viscosity model of asphalt mixture

Nie-yang-zi LIU1(),Xin RONG2,Hong-hai LIU2(),Qing-hua BIAN3,Hai LAN2   

  1. 1.School of Transportation Engineering，Chang'an University，Xi'an 710064，China
    2.Key Laboratory of Road Construction Technology and Equipment，Ministry of Education，Chang'an University，Xi'an 710064，China
    3.Research and Development Center of Highway Construction and Maintenance Technology，Materials and Equipment，Transportation Industry，Gansu Road and Bridge Construction Group Co. ，Ltd. ，Lanzhou 730030，China
  • Received:2021-06-18 Online:2023-01-01 Published:2023-07-23
  • Contact: Hong-hai LIU E-mail:liunieyangzi@chd.edu.cn;liuhonghai@chd.edu.cn

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Abstract:

In view of the large gap between the theoretical construction temperature of mixture determined by asphalt viscosity-temperature test curve and the actual construction temperature of mixture， theoretical analysis and experimental research were carried out on construction temperature determination method based on the mixing power test of asphalt mixture. Through a modified mixer， measuring the mixing power of the mixture at different temperatures and stirring speeds， the relationship between the three could be obtained and the viscosity model of the asphalt mixture based on the mixing power was established. The model shows that： the generalized plastic viscosity of the asphalt mixture depends on the temperature of the mixture， physical properties of the aggregate， gradation， type and amount of asphalt and other material factors， and has nothing to do with the mixer rotating speeds， which represents the rheological properties of the asphalt mixture. By measuring the generalized plastic viscosity of the asphalt mixture at different temperatures， a curve of the generalized plastic viscosity with temperature is obtained. The temperature at which the gradient of the curve change slows down significantly can be used as the construction control temperature of the asphalt mixture.

Key words: road engineering, asphalt mixtures, viscosity model, mixing power, construction temperature

CLC Number: 

  • U414

Fig.1

Composition diagram of mixer for test"

Fig.2

Mixer frequency conversion speed regulation circuit diagram"

Table 1

Mixing test machine parameters"

参 数数 值备 注
容量/kg16?
转速/（r·min-1）0~50采用变频器调速

电机功率/kW

电机转速/（r·min-1）

0.75三相异步电动机
1480?
加热功率/kW0.4电加热自动控温

Fig.3

Mixer for test"

Table 2

Asphalt parameters"

参 数试验结果技术 要求

方法

试验

针入度（5 ℃，5 s，100 g）/0.1mm7560~80T0604
延度（15 ℃）/cm150≥100T0605
软化点/℃49≥45T0606

Table 3

Coarse aggregate parameters"

参 数

结果

试验

技术 要求

方法

试验

表观相对密度3.010≥2.6T0304
吸水率/%0.65≤3T0304
压碎值/%12.5≤25T0316
洛杉矶磨耗值/%16.5≤26T0317
针片状含量/%10.4≤20T0312
黏附性等级5≥4T0616
坚固性/%3.5≤12T0314
软石含量/%0.6≤5T0320
0.075 mm以下含量/%0.7≤5T0320

Table 4

Fine aggregate parameters"

参 数试验结果技术 要求

试验

方法

表观相对密度2.934≥2.6T0328
砂当量/%75≥60T0334
棱角性（流动时间）/s46.7≥45T0344

Table 5

Mineral powder parameters"

参 数结果试验技术要求试验方法
表观相对密度2.679≥2.5T0352
亲水系数0.80＜1.0T0353
0.075 mm筛孔通过率/%88.775~100T0351
0.15 mm筛孔通过率/%98.975~100T0351

Table 6

Mineral grading"

筛孔尺寸/mm通过率/%筛孔尺寸/mm通过率/%
0.0755.04.7539.6
0.156.79.563.1
0.39.813.274.3
0.612.619.094.0
1.1817.526.5100
2.3626.0

Table 7

Mixture parameters"

参 数测试值技术要求
最大理论密度/（g·cm-3）2.736—
试件密度/ （g·cm-3）2.613—
空隙率/%4.53~6
马歇尔稳定度/kN9.7>8
流值/mm3.32~4
残留稳定度比/%86.3>75

Table 8

Test parameters"

参 数数值
试验温度/℃130、140、150、160、170
搅拌转速/（r·min-1）20、30、40、50

Fig.4

Mixing power curve （P?N curve）"

Fig.5

Relationship between plastic viscosity and temperature of asphalt mixture"

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