吉林大学学报(工学版) ›› 2025, Vol. 55 ›› Issue (12): 3964-3975.doi: 10.13229/j.cnki.jdxbgxb.20241186

• 交通运输工程·土木工程 • 上一篇    

疏水降溶性磷石膏填充沥青路面的水稳特性

郭威1(),顾凯鹏2,王思莹1,任东亚3,李学友4,田伟2()   

  1. 1.中国矿业大学 矿业工程学院,江苏 徐州 221116
    2.吉林建筑大学 交通科学与工程学院,长春 130119
    3.西南交通大学 土木工程学院,成都 610031
    4.中铁二局第四工程有限公司,成都 610306
  • 收稿日期:2024-11-05 出版日期:2025-12-01 发布日期:2026-02-03
  • 通讯作者: 田伟 E-mail:weiguo@cumt.edu.cn;weitianjljz@outlook.com
  • 作者简介:郭威(1993-),男,讲师,博士.研究方向:矿山固废的路用处置.E-mail:weiguo@cumt.edu.cn
  • 基金资助:
    国家自然科学基金青年科学基金项目(52408499);吉林省科技发展计划重点研发项目(20230203169SF)

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

摘要:

针对磷石膏填充沥青路面遇水后的溶融软化现象,提出了一种路用磷石膏的疏水降溶处置方法,并对其填充沥青路面的水稳特性和疏水降溶机理进行了研究。结果表明,未改性磷石膏沥青路面浸水残留稳定度以及冻融劈裂强度比均不满足路用水稳要求,其浸水600 h后,磷石膏填料颗粒数量减少了52.60%。经疏水降溶改性处理后,磷石膏的表面极性分量降低了72.46%,与沥青的黏附功提高了11.15%,界面过渡区厚度提高了546%。其作用机理在于,硅烷偶联剂可在磷石膏表面发生脱水缩合反应,接枝形成硅醇基团覆膜,通过覆膜改变磷石膏的表面亲水特性,有效阻止水分的入侵以及水分对沥青膜的置换,进而提高水稳性能。本文研究成果可为拓展磷石膏的路用场景提供理论指导。

关键词: 磷石膏, 疏水降溶, 路面充填, 水稳特性, 降溶机理

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

中图分类号: 

  • U414

图1

磷石膏的渣场堆积及微观形貌"

图2

磷石膏的主要矿物成分"

图3

AC-16级配形式"

表1

沥青的技术参数"

技术指标测试结果技术要求测试方法
密度/(g?cm-31.036N/AT0603
针入度/25 °C, 0.1 mm6560~80T0604
软化点/℃100≥ 100T0606
延度/15 ℃, cm> 100≥ 43T0605

图4

沥青的分子模型"

图5

磷石膏及其他填料的分子模型"

图6

填料-沥青界面分子模型"

图7

沥青混合料的浸水马歇尔试验结果"

图8

沥青混合料的冻融劈裂试验结果"

图9

沥青样本浸水前、后的储能模量和损耗模量"

图10

浸水前、后填料吸附沥青膜厚度"

图11

3组沥青胶浆样本浸水前、后的填料3D分布图"

表2

沥青胶浆浸水前、后填料的体积参数"

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

表3

填料的表面自由能参数与黏附功 (mJ/m2)"

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

图12

沥青胶浆样本的EDX试验结果"

图13

沥青与填料的界面过渡区"

图14

沥青组分与填料的静电电位分布图"

图15

沥青分子与填料接触界面的电位分布图"

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