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Open AccessArticle

Influence of the Aggregate Surface Conditions on the Strength of Quick-Converting Track Concrete

1
Department of Civil and Environmental Engineering, Sejong University, 98 Gunja-Dong, Gwangjin-Gu, Seoul 05006, Korea
2
Korea Railroad Research Institute, 176 Railroad Museum Road, Uiwang-si, Gyeonggi-do 16105, Korea
3
School of Urban and Environmental Engineering, Ulsan National Institute of Sciences and Technology (UNIST), 50 UNIST-gil, Ulju-gun, Ulsan 44919, Korea
*
Authors to whom correspondence should be addressed.
Crystals 2020, 10(6), 543; https://doi.org/10.3390/cryst10060543
Received: 25 May 2020 / Revised: 15 June 2020 / Accepted: 17 June 2020 / Published: 24 June 2020
This experimental study investigates the effects of the aggregate surface conditions on the compressive strength of quick-converting track concrete (QTC). The compressive strength of QTC and interfacial fracture toughness (IFT) were investigated by changing the amount of fine abrasion dust particles (FADPs) on the aggregate surface from 0.00 to 0.15 wt% and the aggregate water saturation from 0 to 100%. The effects of aggregate water saturation on the compressive strength of the QTC and IFT were notably different, corresponding to the amount of FADPs. As the aggregate water saturation increased from 0 to 100%, in the case of 0.00 wt% FADPs, the IFT decreased from 0.91 to 0.58 MPa∙mm1/2, and thus, the compressive strength of the QTC decreased from 34.8 to 31.4 MPa because the aggregate water saturation increased the water/cement ratio at the interface and, consequently, the interfacial porosity. However, as the aggregate water saturation increased from 0 to 100%, in the case of 0.15 wt% FADPs, the compressive strength increased from 24.6 to 28.1 MPa, while the IFT increased from 0.41 to 0.88 MPa∙mm1/2 because the water/cement ratio at the interface was reduced as a result of the absorption by the FADPs on the surface of the aggregates and the cleaning effects of the aggregate surface. View Full-Text
Keywords: Interfacial transition zone; quick-converting track concrete; aggregate surface condition; railway ballast Interfacial transition zone; quick-converting track concrete; aggregate surface condition; railway ballast
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Hwang, R.; Lee, I.-W.; Pyo, S.; Kim, D.J. Influence of the Aggregate Surface Conditions on the Strength of Quick-Converting Track Concrete. Crystals 2020, 10, 543.

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