Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (11): 3244-3254.doi: 10.13229/j.cnki.jdxbgxb.20230073

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Evaluation of high-temperature rheological properties of asphalt mastic and its filler stiffening effect

Song LI1,2(),Xing-xing SHI1,3,Chun-di SI1,2,Ji-wang JIANG4,Bin-shuo BAO5   

  1. 1.School of Traffic and Transportation，Shijiazhuang Tiedao University，Shijiazhuang 050043，China
    2.State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures，Shijiazhuang Tiedao University，Shijiazhuang 050043，China
    3.School of Civil Engineering，Shijiazhuang Tiedao University，Shijiazhuang 050043，China
    4.School of Transportation，Southeast University，Nanjing 211102，China
    5.School of Management，Shijiazhuang Tiedao University，Shijiazhuang 050043，China
  • Received:2023-01-28 Online:2024-11-01 Published:2025-04-24

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Abstract:

In order to evaluate the effect of filler particles on the properties of asphalt mastic， its high-temperature rheological performance of asphalt mastic is investigated by using a modified multiple stress creep recovery （MSCR） test. The difference in Jnr values between an asphalt binder and its corresponding asphalt mastic is proposed as an index to evaluate the filler stiffening effect in asphalt mastic quantitatively. The results showed that the filler stiffening effect was highly related with the type of asphalt binder. For the SBS-modified asphalt mastic， the addition of mineral filler tends to stiffen the binder until a critical filler content where any further addition of filler would not yield any stiffening effect in the resulting asphalt mastic. It was found that the critical filler contents can be regarded as appropriate filler content for the SBS-modified mastic. It was also found that the critical filler contents can be regarded as appropriate filler content for the SBS-modified mastic and they are found to be 120% and 100% of asphalt binder by mass for the asphalt mastics made by modified binders with 3.5% and 4.0% SBS respectively. Multiple linear regression modelsfor quantifying the filler stiffening effect are derived and the effect of creep stress， SBS content and filler content on filler stiffening is discussed.

Key words: pavement engineering, asphalt mastic, high-temperature rheological properties, filler stiffening effect, appropriate filler content, multiple stress creep recovery test

CLC Number: 

  • U416

Table 1

Performance of asphalt binders"

技术指标沥青种类
基质沥青SBS改性沥青-ⅠSBS改性沥青-Ⅱ
SBS含量/%03.54.0
软化点/°C476576
延度/cm（5 cm/min， 5 ℃）-5043
延度/cm（5 cm/min， 15 ℃）60--
针入度（0.1 mm， 100 g， 15 ℃， 5 s）252121
针入度（0.1 mm， 100 g， 25 ℃， 5 s）705254
针入度（0.1 mm， 100 g， 30 ℃， 5 s）1258786
针入度指数-1.004 5-0.228 0-0.115 3
PG高温分级PG 64-××PG 70-××PG 76-××

Fig.1

Framework of MSCR test for asphalt mastic"

Fig.2

Illustration of strain-time relationship for asphalt mastic at one creep stress level of the MSCR test"

Fig.3

Jnr values for NM with different filler contents"

Fig.4

Jnr values for 3.5M and 4.0M with different filler contents and creep stresses"

Fig.5

ΔJnr results of different asphalt mastics"

Fig.6

Linear regression of Ⅰ and Ⅱ phases of 3.5M and 4.0M"

Table 2

Results of linear model for Ⅰ and Ⅱ phases of SBS-modified mastics"

沥青

胶浆

应力

/kPa

模型模型

转折点

矿粉掺量/%

转折点矿粉掺量

平均值/%

Ⅰ阶段R2Ⅱ阶段R2
3.5M25.6y=0.786 6x+0.315 30.993y=0.142 7x+1.078 80.980118.57124.84
12.8y=0.510 9x+0.226 10.983y=0.064 3x+0.786 40.830125.46
6.4y=0.282 2x+0.316 00.922y=0.013 1x+0.661 60.845128.43
3.2y=0.119 8x+0.387 50.958y=0.002 9x+0.531 60.839123.27
0.1y=0.025 4x+0.342 60.800y=0.001 5x+0.373 30.920128.45
4.0M25.6y=1.006 6x-0.379 50.999y=0.148 8x+0.503 70.839102.96102.30
12.8y=0.615 2x-0.210 60.976y=0.073 6x+0.360 00.778105.35
6.4y=0.279 7x+0.033 40.990y=0.017 1x+0.304 30.732103.16
3.2y=0.098 5x+0.166 30.996y=0.005 3x+0.261 60.729102.25
0.1y=0.033 1x+0.146 40.974y=0.002 0x+0.176 80.79197.75

Fig.7

Fitting results of the multiple linear regression models"

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