POLYMER-MODIFIED CEMENT ASPHALT MORTAR AS INTERLAYER IN THE NON-BALLASTED TRACK OF HIGH-SPEED TRAIN

Authors

  • Aditya Wahyu Erlangga Department of Civil and Environmental Engineering, Universitas Gadjah Mada, Yogyakarta 55284, Indonesia
  • Latif Budi Suparma Department of Civil and Environmental Engineering, Universitas Gadjah Mada, Yogyakarta 55284, Indonesia
  • Suprapto Siswosukarto Department of Civil and Environmental Engineering, Universitas Gadjah Mada, Yogyakarta 55284, Indonesia

Keywords:

Non-ballasted track, Cement asphalt mortar, Polymer-modified cement asphalt mortar, Polymer-modified asphalt emulsion, SBR polymer, Polymer pH, Workability, Compatibility

Abstract

Non-ballasted track consists of a concrete slab bonded firmly to the concrete base by a cement asphalt mortar (CAM) as an interlayer for damping. In practice, interface bonding failure occurs on CAM. Styrene-butadiene rubber (SBR) polymer is proposed as a modifying material to increase the interface bonding strength of CAM. The problem of polymer modification in CAM is probably related to poor compatibility and workability. This study aims to investigate the effect of the SBR polymer pH value on the compatibility and workability in CAM. Compatibility is determined by separation rate. Zeta potential value describes polymer-modified asphalt emulsion (PMAE) activity. Workability is determined by funnel fluidity time and slump flow time. Results showed that increasing the SBR polymer pH value decreased the zeta potential of PMAE. Decreasing zeta potential to be value-neutral results in destabilized asphalt droplets, demulsified, separated water, and asphalt coalescence. Finally, the asphalt coalescence is covered by polymer and forms a binding film on cement. It is affecting the compatibility between PMAE and cement hydration. It results in a low separation rate. Compatibility is achieved by SBR polymer pH 10.0 doses ranging from 1% to 6%. SBR polymer dosage of 1% to 3% led to a deceleration in funnel fluidity time and slump flow time associated with elevated demulsification. Their 4% to 6% dose accelerates funnel fluidity time and slump flow time associated with delaying demulsification. Acceptance of compatibility and workability in CAM is proposed using SBR polymer pH 10.0 dosage of 4% to 6%.

Author Biography

Latif Budi Suparma, Department of Civil and Environmental Engineering, Universitas Gadjah Mada, Yogyakarta 55284, Indonesia

Dear Editor-in-Chief

International Journal of Geomate

On behalf of my co-authors, I am submitting the enclosed manuscript for possible publication in International Journal of Geomate

Hereby I confirm that this manuscript has not been submitted to this journal previously. This manuscript has been submitted solely to this journal and is not published, in press, or submitted elsewhere.

This study aimed to examine the effect of SBR polymer pH modification on the compatibility between asphalt emulsion and cement hydration, as well as the workability characteristics of CAM, the zeta potential was found to decrease as the pH value of the SBR polymer increased. The decrease from a strongly cationic to an approximately neutral resulted in the destabilization of asphalt emulsion droplets. This destabilization led to rapid flocculation and demulsification, adversely affecting the compatibility between asphalt emulsion and cement hydration.  

We believe that the findings presented in our paper will appeal to the specific scientists who subscribe to the International Journal of Geomate

We have no conflict of interest to disclose. Please address all correspondence concerning this manuscript to me at lbsuparma@ugm.ac.id

 

Thank you for your consideration of this manuscript.

Sincerely,

Latif Budi Suparma

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Published

2024-03-30

How to Cite

Erlangga, A. W., Suparma, L. B. ., & Siswosukarto, S. . (2024). POLYMER-MODIFIED CEMENT ASPHALT MORTAR AS INTERLAYER IN THE NON-BALLASTED TRACK OF HIGH-SPEED TRAIN. GEOMATE Journal, 26(115), 18–26. Retrieved from https://geomatejournal.com/geomate/article/view/4155

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