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"Behaviour of lump-grout material filled PVC tubular column under uniax" by Hongchao Zhao, Ting Ren et al.

The hybrid structural form made of the polyvinyl chloride (PVC) and lump-grout (LG) material, termed LGFPT column, was developed as the alternative standing support for deep underground mines. To explore the mechanical response of this structural form under the uniaxial compression, various critical parameters (i.e., the water-to-powder ratio of the cementitious grout material, length-to-diameter ratio of the PVC tube, loading mode and loading speed) were investigated. Test results showed that the LGFPT column had an excellent ductility (>30% of the column length) associated with the strain hardening behaviour. Compared to its counterparts, the effect of the water-to-powder ratio of the grout material is most significant when the peak load of the LGFPT is evaluated. In parallel, the compressive behaviour of the cementitious grout material-filled PVC tubular (GFPT) column was investigated. When the ultimate axial compressive strength of the LGFPT and the GFPT are compared, the streng ....

Hybrid Columns , Ump Grout Material , Polyvinyl Chloride , Train Hardening Behaviour , Underground Mines ,

"Standing support incorporating FRP and high water-content material for" by Hongchao Zhao, Ting Ren et al.

Abstract
The integrity and stability of underground space mainly depend upon the coordination of primary and secondary support system. This paper presents a novel secondary standing support system, termed fibre-reinforced polymer (FRP)-confined high-water content cementitious grout material column (FCCM), being an alternative structural form for underground space. The attractive feature of the FCCM is its exterior container made of FRP composite with high strength-to-weight ratio and high corrosion resistance. A total of 30 FCCM specimens were prepared and tested to demonstrate its expected structural behaviour under compression. The critical parameters covered the type and the thickness of FRP tube as well as the strength of infill material. Test results verified that the cementitious grout material in the FCCM was effectively confined by the exterior FRP tube, resulting in the significant enhancement of load carrying capacity and deformation ability. The test results also in ....

Cementitious Grout Material , Ibre Reinforced Polymer Frp , High Water Content , Train Hardening Behaviour , Underground Space ,