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

GAO Yi; LI Hao-xin; MA Cong; YANG Xu; DONG Bi-qin; LI Hui; DU Yan-liang

doi:10.19818/j.cnki.1671-1637.2025.02.020

Volume 25 Issue 2

Apr. 2025

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GAO Yi, LI Hao-xin, MA Cong, YANG Xu, DONG Bi-qin, LI Hui, DU Yan-liang. Preparation and early-strength mechanism of CA mortar for rapid repair and replacement of slab ballastless track filling layer[J]. Journal of Traffic and Transportation Engineering, 2025, 25(2): 311-321. doi: 10.19818/j.cnki.1671-1637.2025.02.020

Citation:

GAO Yi, LI Hao-xin, MA Cong, YANG Xu, DONG Bi-qin, LI Hui, DU Yan-liang. Preparation and early-strength mechanism of CA mortar for rapid repair and replacement of slab ballastless track filling layer[J]. Journal of Traffic and Transportation Engineering, 2025, 25(2): 311-321. doi: 10.19818/j.cnki.1671-1637.2025.02.020

Citation:

GAO Yi, LI Hao-xin, MA Cong, YANG Xu, DONG Bi-qin, LI Hui, DU Yan-liang. Preparation and early-strength mechanism of CA mortar for rapid repair and replacement of slab ballastless track filling layer[J]. Journal of Traffic and Transportation Engineering, 2025, 25(2): 311-321. doi: 10.19818/j.cnki.1671-1637.2025.02.020

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

doi: 10.19818/j.cnki.1671-1637.2025.02.020

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
Received Date: 2024-03-18
Publish Date: 2025-04-28

Abstract

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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References(29)

References

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

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