板式无砟轨道充填层快修换填CA砂浆的制备与早强机理

高义; 李好新; 马聪; 杨旭; 董必钦; 李辉; 杜彦良

doi:10.19818/j.cnki.1671-1637.2025.02.020

板式无砟轨道充填层快修换填CA砂浆的制备与早强机理

doi: 10.19818/j.cnki.1671-1637.2025.02.020

高义¹,
李好新¹,
马聪^{2, 3, ,},
杨旭⁴,
董必钦²,
李辉¹,
杜彦良^{2, 3}

1.
同济大学材料科学与工程学院, 上海 201804
2.
深圳大学土木与交通工程学院, 广东深圳 518060
3.
深圳大学极端环境绿色长寿道路工程全国重点实验室(深圳), 广东深圳 518060
4.
长安大学公路学院, 陕西西安 710064

基金项目:

国家重点研发计划 2023YFB2604000

国家自然科学基金项目 52178233

国铁集团重大课题 K2022G038

广东省珠江学者岗位计划资助项目 2021QN02G957

深圳市科技创新专项 JCYJ20240813143059040

深圳市科技创新专项 JCYJ20220531101605012

深圳市科技创新专项 20231121085626001

详细信息

作者简介:
高义(1986-)，女，山东菏泽人，同济大学博士研究生，从事高性能修复材料研究

通讯作者:
马聪(1989-)，男，山东菏泽人，深圳大学研究员，工学博士

中图分类号: U415.6
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- 被引次数: 0
出版历程
- 收稿日期: 2024-03-18
- 刊出日期: 2025-04-28

Preparation and early-strength mechanism of CA mortar for rapid repair and replacement of slab ballastless track filling layer

GAO Yi¹,
LI Hao-xin¹,
MA Cong^{2, 3
, ,},
YANG Xu⁴,
DONG Bi-qin²,
LI Hui¹,
DU Yan-liang^{2, 3}

1.
School of Material Sciences and Engineering, Tongji University, Shanghai 201804, China
2.
College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China
3.
National Key Laboratory of Green and Long-Life Road Engineering in Extreme Environment (Shenzhen), Shenzhen University, Shenzhen 518060, Guangdong, China
4.
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

Funds:

National Key R&D Program of China 2023YFB2604000

National Natural Science Foundation of China 52178233

Major Project of China Railway K2022G038

Project Supported by GDUPS 2021 2021QN02G957

Shenzhen Science and Technology Innovation Special Fund JCYJ20240813143059040

Shenzhen Science and Technology Innovation Special Fund JCYJ20220531101605012

Shenzhen Science and Technology Innovation Special Fund 20231121085626001

More Information

Corresponding author: MA Cong (1989-), male, research fellow, PhD, msk2017@188.com

Article Text (Baidu Translation)

摘要

摘要: 为解决中国高速铁路CRTS Ⅱ型板充填层大修更换问题，开发了满足施工天窗期和早期性能要求的快速硬化水泥乳化沥青(CA)砂浆；分别以磷酸镁水泥和硫铝酸钙水泥混合阳离子乳化沥青制备了磷酸镁水泥基乳化沥青(MCA)砂浆和硫铝酸盐水泥基乳化沥青(SCA)砂浆，采用Bingham模型拟合流变参数，量化浆体屈服应力和塑性黏度，利用动弹性模量测试仪测定7 d弹性模量，通过加速溶蚀试验量化Mg²⁺/Ca²⁺溶出速率，结合SEM-EDS微观分析揭示沥青相与水泥水化产物的界面作用机制。研究结果表明：2种体系终凝时间均小于60 min，满足高铁维修天窗期要求；MCA砂浆2 h抗压强度达11.5~29.3 MPa，SCA砂浆为5.1~9.3 MPa，28 d弹性模量均大于7 GPa；随A/C比增加，MCA流动性从170 mm降至140 mm，屈服应力提升至9.284 Pa，而SCA体系的流动性更优，同时SCA砂浆比MCA砂浆表现出更好的体积稳定性及耐水性；微观结构显示沥青膜与鸟粪石、钙矾石相互交织形成致密网络。可见，SCA型CA砂浆在早期强度、耐水性和离子稳定性方面表现更优，可作为CRTS Ⅱ型充填层快修材料的优选方案。
- 高速铁路 /
- CRTS Ⅱ型无砟轨道 /
- 充填层 /
- 乳化沥青砂浆 /
- 磷酸镁水泥 /
- 硫铝酸盐水泥
Abstract: Targeted at major repair and replacement of China railway track system (CRTS) Ⅱ type slab filling layers in high-speed railway, fast-hardening cement emulsified asphalt (CA) mortar satisfying the construction window time and early performance was developed. Magnesium phosphate cement-based emulsified asphalt (MCA) mortar and sulphate aluminium cement-based emulsified asphalt (SCA) mortar were prepared by using magnesium phosphate cement and sulphate aluminium cement combined with cationic emulsified asphalt. The Bingham model was employed to fit the rheological parameters, quantifying the yield stress and plastic viscosity of the slurry. A dynamic elastic modulus tester was used to measure the 7 d elastic modulus, and accelerated leaching tests were conducted to quantify the leaching rates of Mg²⁺/Ca²⁺. Scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM-EDS) microstructural analysis was used to reveal the interfacial interaction mechanism between the asphalt phase and cement hydration products. Research results show that the final setting time of both systems is under 60 min, satisfying the maintenance window time of high-speed railways. The 2 h compressive strength of MCA mortar is 11.5-29.3 MPa, and that of SCA mortar is 5.1-9.3 MPa. Both have a 28 d elastic modulus exceeding 7 GPa. As the A/C ratio increases, the fluidity of MCA drops from 170 mm to 140 mm, with the yield stress rising to 9.284 Pa. SCA shows better fluidity and outperforms MCA in volume stability and water resistance. Microstructurally, the asphalt film intertwines with struvite and ettringite to form a dense network. Therefore, SCA-type CA mortar is preferable for rapid repair of the CRTS Ⅱ filling layers due to its superior early strength, water resistance, and ionic stability.
- high-speed railway /
- CRTS Ⅱ type ballastless track /
- filling layer /
- emulsified asphalt mortar /
- magnesium phosphate cement /
- sulphate aluminium cement

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图 1 浆体流变参数剪切制度

Figure 1. Shear procedures for rheological parameters of slurry

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图 2 动态弹性模量测试

Figure 2. Dynamic elastic modulus test

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图 3 MCA与SCA净浆的凝结时间

Figure 3. Setting time of MCA and SCA paste

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图 4 MCA与SCA砂浆流动度

Figure 4. Fluidities of MCA and SCA mortar

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图 5 MCA与SCA砂浆流变曲线

Figure 5. Rheological curves of MCA and SCA mortar

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图 6 MCA与SCA砂浆抗折和抗压强度

Figure 6. Flexural and compressive strengths of MCA and SCA mortar

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图 7 7天龄期MCA和SCA的动态弹性模量

Figure 7. Dynamic elastic moduli of MCA and SCA at 7 d age

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图 8 MCA与SCA砂浆体积稳定性

Figure 8. Volume stabilities of MCA and SCA mortar

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图 9 MCA与SCA砂浆浸水后强度保留系数

Figure 9. Strength retention coefficients of MCA and SCA mortar after water soaking

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图 10 累积离子溶出量变化曲线

Figure 10. Variation curves of cumulative ion leaching amount

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图 11 在加速溶蚀下的离子溶出速率

Figure 11. Ion leaching rates under accelerated leaching

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图 12 MCA与SCA砂浆养护28 d的微观结构

Figure 12. Microstructures of MCA and SCA mortar after curing 28 d

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图 13 加速溶蚀后砂浆微观结构

Figure 13. Microstructures under accelerated leaching

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表 1 重烧氧化镁的化学组成

Table 1. Chemical composition of MgO %

SiO₂	Al₂O₃	Fe₂O₃	MgO	CaO	Na₂O
4.67	2.12	1.35	89.21	2.65

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表 2 SAC的化学组成

Table 2. Chemical composition of SAC %

SiO₂	Al₂O₃	Fe₂O₃	MgO	CaO	K₂O	SO₃	TiO₂
8.74	15.06	1.66	2.27	44.44	0.61	18.07	0.67

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表 3 MCA与SCA砂浆基本配比

Table 3. Proportions of MCA and SCA mortar

编号	M/P	R/M	P/S/%	T/S/%	A/C	W/C
1	3∶1	0.15			0.0	0.15
2	3∶1	0.15			0.1	0.15
3	3∶1	0.15			0.2	0.15
4			0.1	1	0.0	0.45
5			0.1	1	0.2	0.45
6			0.1	1	0.4	0.45

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表 4 硝酸铵溶液更换准则

Table 4. Replacement criterion of ammonium nitrate solution

pH值	< 8.1	8.1~ 8.2	8.2~ 8.3	8.3~ 8.4	8.4~ 8.5	>8.5
更换体积/mL	100	150	250	350	450	500

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表 5 MCA与SCA砂浆流变曲线拟合结果

Table 5. Rheological curve fitting results of MCA and SCA mortar

样品编号	τ₀/Pa	η/(Pa·s)	R²
1	2.460	0.300	0.994
2	3.870	0.354	0.993
3	9.284	0.566	0.996
4	0.930	0.100	0.986
5	1.604	0.136	0.988
6	7.828	0.244	0.991

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