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By wrapping a concrete column with an FRP jacket, the shear, moment, and axial capacity are improved. In addition, the ductility of the member may be significantly improved. The FRP jacket is formed by wrapping the column with the FRP fibers oriented in the transverse (hoop) direction. Sometimes in the FRP jacket fiber in axial direction are presents for flexural strengthening. The jacket provides significant confinement to the concrete, which leads to the mechanical performance improvements.

Carbopree, Arapree and Glasspree sheet systems are very effective in enhancing the axial performance of concrete columns. When columns are subjected to axial and flexural loads the use of 0/90 degrees Carbopree sheet is recommended.

To select the rigth FRP, please remark:

• the significant problem with GFRP, creep rupture, is not a concern with column wrapping because under sustained loads, the FRP jacket remains virtually stress free.
• the strength improvements afforded with GFRP are lower than those achieved with CFRP;
• The ductility of a column wrapped with GFRP or AFRP sheets is superior to that of a CFRP jacketed column.
• CFRP anyhow is much more durable than GFRP or AFRP.

In this respect, if the criteria is:

• strength improvement and/or durability, Carbopree Sheet HS 300 and then Arapree Sheet 300 must be preferred in the specification;
• ductility and durability, Arapree Sheet 300 and then Glasspree Sheet 900 must be preferred in the specification;

Click the name to download the technical data sheets:

• Carbopree Sheet HS 300 (pdf);
• Glasspree Sheet 600 (pdf);
• Arapree Sheet 300 (pdf);