Abstract
A sulphoaluminate cement-asphalt emulsion mortar was developed for the repair of damaged cement asphalt emulsion mortar. Various sulfoaluminate/Portland cement and asphalt emulsion/cement mass ratios, as well as emulsion types, were studied with respect to the setting time, rheological properties, volume stability, and mechanical properties of the repair materials in order to determine a reasonable mix proportion. The proper contents of cementitious materials and asphalt emulsion were determined. A possible relationship between the mechanical properties and the asphalt emulsion/cement mass ratio was found based on scanning electron microscopy analysis. Moreover, the shrinkage rates of the repair mortar in the fresh and hardened states showed different trends with an increase in the asphalt emulsion/cement mass ratio. The results shed light on the repair mortar for CA mortar with high efficiency and low cost.
Highlights
Cement and asphalt mortar (CA mortar) is the key component of high-speed railways, supporting the weight of the slab track and train and acting as a shock-absorber (Leiben et al, 2018; Najjar et al, 2019)
The purpose of this study is to develop, using high asphalt content, sulphoaluminate cement-based repair materials with low modulus and ensure the cost is kept low
The setting time of the Sulphoaluminate cement (SAC)/PC-AE paste is governed by both the cement hydration speed and the asphalt emulsion demulsification speed
Summary
Cement and asphalt mortar (CA mortar) is the key component of high-speed railways, supporting the weight of the slab track and train and acting as a shock-absorber (Leiben et al, 2018; Najjar et al, 2019). Under the coupling effects of high-frequency loading and environmental erosion (Zhu et al, 2014; Fu et al, 2015; Le et al, 2019), the CA mortar tends to be damaged or broken, which significantly influences the structural and driving safety (Zhu et al, 2014; Liu et al, 2016). The modulus of the CA mortar for the Max Bögl slab would be 800∼1,200 MPa if tested with the same methods used for the Shinkansen slab
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
