Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (12): 3964-3975.doi: 10.13229/j.cnki.jdxbgxb.20241186

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Moisture stability of hydrophobicity⁃desolubilization phosphogypsum filled asphalt pavement

Wei GUO1(),Kai-peng GU2,Si-ying WANG1,Dong-ya REN3,Xue-you LI4,Wei TIAN2()   

  1. 1.School of Mining Engineering，China University of Mining and Technology，Xuzhou 221116，China
    2.School of Traffic Science & Engineering，Jilin Jianzhu University，Changchun 130119，China
    3.School of Civil Engineering，Southwest Jiaotong University，Chengdu 610031，China
    4.China Railway ERJU 4th Engineering Co. ，Ltd，Chendu 610306，China
  • Received:2024-11-05 Online:2025-12-01 Published:2026-02-03
  • Contact: Wei TIAN E-mail:weiguo@cumt.edu.cn;weitianjljz@outlook.com

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Abstract:

To address the melting and softening issues of phosphogypsum （PG）-filled asphalt pavement after exposure to water， a hydrophobicity treatment of PG was introduced to reduce solubility. An in-depth investigation was conducted into the moisture stability characteristics and solubility reduction mechanisms of asphalt pavement incorporating modified PG. The results showed that the immersion residual stability and freeze-thaw splitting strength ratio did not meet the moisture stability requirements for pavements. Additionally， after 600 hours of immersion， the number of PG filler particles decreased by 52.60%. Following hydrophobic modification， the polar component of PG decreased by 72.46%， the interface adhesion strength improved by 11.15%， and the thickness of the interface transition zone increased by 546%. The mechanism is that silane coupling agent can undergo dehydration condensation reaction on the surface of phosphogypsum and graft to form a silanol group coating. The hydrophilic property of the phosphogypsum surface is altered by the coating， which effectively prevents the intrusion of water and the displacement of the asphalt film， thereby improving the water stability performance. These results provide a theoretical basis for expanding the application of PG in road construction.

Key words: phosphogypsum, hydrophobicity desolubilization, pavement filling, moisture stability, hydrophobicity mechanism

CLC Number: 

  • U414

Fig.1

Accumulation and micromorphology of PG"

Fig.2

Main mineral composition of PG"

Fig.3

Gradation of AC-16"

Table 1

Technical parameters of asphalt"

技术指标测试结果技术要求测试方法
密度/（g?cm-3）1.036N/AT0603
针入度/25 °C， 0.1 mm6560~80T0604
软化点/℃100≥ 100T0606
延度/15 ℃， cm> 100≥ 43T0605

Fig.4

Asphalt molecular model"

Fig.5

PG and other fillers molecular model"

Fig.6

Filler-asphalt interface molecular model"

Fig.7

Immersion Marshall test results of asphalt mixture"

Fig.8

Freeze-thaw split test results of asphalt mixture"

Fig.9

Storage modulus and loss modulus of asphalt samples before and after immersion"

Fig.10

Thickness of asphalt film adsorbed by fillers before and after immersion"

Fig.11

3D distribution of fillers in three asphalt mortar samples before and after immersion"

Table 2

Volumetric parameters of filler in asphalt mortar before and after immersion"

参 数MP-AMPG-AMSPG-AM

填料体积

/m3

浸水前4.14×10-62.59×10-62.99×10-6
浸水后3.73×10-61.59×10-62.53×10-6
下降幅度/%9.9038.6115.38
填料表面积/m2浸水前1.75×10-21.34×10-21.50×10-2
浸水后1.59×10-27.87×10-31.28×10-2
下降幅度/%9.1441.2614.67

填料颗粒

数量/n

浸水前5 3425 2895 030
浸水后4 8122 5074 353
下降幅度/%9.9252.6013.46

Table 3

Surface free energy parameters and adhesion work of fillers"

填料类型MPPGSPG
色散分量11.561.055.52
极性分量11.3571.5719.71
表面自由能22.9172.6325.23
黏附功41.7030.4833.88

Fig.12

EDX test results of asphalt mortar samples"

Fig.13

Transition zone thickness of asphalt-fillers interface"

Fig.14

Electrostatic potential distribution between asphalt components and fillers"

Fig.15

Potential distribution of the contact interface between asphalt components and fillers"

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