Sealed-space-filling SCC: A special SCC applied in high-speed rail of China

• Seal-spaced-filling SCC (SSFSCC), a special SCC applied in high-speed rail, was introduced.
• The property requirements of SSFSCC and corresponding testing methods were elaborated.
• Raw material and mix proportioning of SSFSCC were presented.
• The construction technology of SSFSCC was addressed.

Sealed-space-filling self-compacting concrete (SSFSCC) is used in China Rail Track System (CRTS) III ballastless slab track of high-speed rail, which has been originally developed in China recently. In this track system, SSFSCC needs to be grouted into a flat, narrow, and sealed space (90 mm × 2500 mm × 5600 mm) which is enclosed by above prefabricated slab and bottom base plate. Good bonding between SSFSCC filling layer and above prefabricated slab has to be secured since these two layers are required to work as a composite plate. SSFSCC presents some special characteristics in comparison with normal SCC. This paper elaborated the property requirements of SSFSCC and the structural characteristics of SSFSCC layer of CRTS III ballastless slab track of high-speed rail. The compositions and mix proportioning of SSFSCC as well as construction technology were briefly introduced. The challenges of the application of this special SCC were also addressed.

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