沥青胶结磷石膏对其性能影响及微观分析

毛润; 何东升; 杨帆; 张泽强; 李智力

doi:10.3969/j.issn.1000-6532.2024.04.028

沥青胶结磷石膏对其性能影响及微观分析

武汉工程大学　资源与安全工程学院，湖北　武汉　430073

基金项目: 湖北省高等学校优秀中青年科技创新团队计划项目（T2021006）；云南省技术创新中心项目（202305AK340002）；湖北省国际科技合作项目（2023EHA071）；湖北省技术创新计划重点研发专项(2023BCB076)

详细信息

作者简介: 毛润（1997-），男，硕士研究生，研究方向为二次资源综合利用

通讯作者: 何东升（1979-），男，博士，教授，研究方向为矿物分选理论与技术、固体废弃物综合利用等。

中图分类号: TD989;X754

收稿日期: 2022-10-09

刊出日期: 2024-08-25

Effect of Asphalt Cemented Phosphogypsum on its Performance and Microscopic Analysis

School of Resources & Safety Engineering, Wuhan Institute of Technology, Wuhan 430073, Hubei, China

More Information

Corresponding author: HE Dongsheng, hds@wit.edu.cn

Received Date: 09 October 2022

Publish Date: 25 August 2024

摘要

摘要:
这是一篇陶瓷及复合材料领域的论文。为探索磷石膏在道路材料应用新途径，采用磷石膏粉与沥青胶浆搅拌混合，制备磷石膏改性沥青混料。研究搅拌温度、粉胶比及多聚磷酸掺入量对磷石膏改性沥青三大指标的影响。研究结果表明：搅拌温度的增加，软化点也随之提升，延度先升高随后不再提升，考虑能效及老化温度，沥青的加工温度应在135～145 ℃之间；增大粉胶比可以提升改性沥青的软化点，同时会使沥青的延度下降，故以磷石膏为改性剂改性沥青时粉胶比不应大于0.9；多聚磷酸掺入改性沥青对软化点有较大的提升，但会使其延度和针入度下降，多聚磷酸较佳掺入量应为1.5%；红外光谱(FTIR)和热重分析(TG-DSC)表明，磷石膏与沥青仅为物理胶结，多聚磷酸掺入沥青时会与沥青发生化学反应。研究结果可为磷石膏在道路材料的工程应用和理论研究提供参考。
- 陶瓷及复合材料 /
- 磷石膏 /
- 改性沥青 /
- 粉胶比 /
- 三大指标
Abstract:
This is an article in the field of ceramics and composites. In order to explore a new way for the application of phosphogypsum in road materials, phosphogypsum powder and asphalt mortar were mixed to prepare phosphogypsum modified asphalt. The effects of mixing temperature, powder-binder ratio and polyphosphoric acid content on the three major indicators of phosphogypsum modified asphalt were studied. The research results show that the softening point increases as the mixing temperature increases, and the ductility increased first and then kept constant. Considering energy efficiency and aging temperature, the processing temperature of asphalt should be in the range 135 °C and 145 °C. increasing the powder gum ratio can increase the softening point of the modified asphalt and decrease the ductility of the asphalt. Therefore, the ratio of filler bitumen should not be greater than 0.9 using phosphogypsum as the modifier. The addition of polyphosphoric acid greatly increases the softening point of modified asphalt, but reduces its ductility and penetration. The optimal amount of polyphosphoric acid should be around 1.5%. Infrared spectroscopy (FTIR) and thermogravimetric analysis (TG-DSC) showed that phosphogypsum physically functioned with Asphalt. When polyphosphoric acid was mixed into asphalt, it would react chemically with asphalt. The research results could provide references for the engineering application and theoretical research of phosphogypsum in road materials.
- Ceramics and composites /
- Phosphogypsum /
- Modified asphalt /
- Powder-binder ratio /
- Three leading indicators

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图 1 磷石膏XRD

Figure 1.

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图 2 搅拌温度对沥青性能影响

Figure 2.

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图 3 不同粉胶比对沥青性能影响

Figure 3.

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图 4 多聚磷酸的掺入量对改性沥青性能的影响

Figure 4.

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图 5 沥青及改性沥青红外光谱图谱

Figure 5.

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图 6 沥青及改性沥青的同步热分析

Figure 6.

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表 1 磷石膏样品XRF分析结果/%Table 1 XRF analysis results of phosphogypsum samples

Al₂O₃	P₂O₅	SiO₂	Na₂O	K₂O	CaO	TiO₂	SO₂	SrO	F	其他
1.10	4.63	2.31	1.62	0.24	34.33	0.12	49.04	0.67	2.86	3.08

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表 2 SHELL-70^#基质沥青三大指标性能实验结果

Table 2. SHELL-70^#matrix asphalt three index performance results

项目	实测值	技术要求
针入度（25 ℃）/0.1 mm	74.5	60～80
软化点/℃	48.5	>45
延度（25 ℃）/cm	114.4	>100

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表 3 沥青及改性沥青的DSC分析

Table 3. DSC analysis of asphalt and modified asphalt

样品	焓/（J/g）	峰值温度/℃	峰宽度/℃
基质沥青	2.85	460.0	242.3～498.9
磷石膏改性沥青	1.27	462.3	238.9～498.5
多聚磷酸复合改性沥青	1.04	461.3	235.6～490.5

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