until two weeks before testing. At that time they were removed from their molds and

sulfur cement caps were placed on each end. The total curing time for all cylinder

specimens was 125 days.

Table 3-1. Cylinder test matrix
Cylinder Number CFRP Grid Grid
type of grid layers dia.
 specimens (in.)
 Control 3 No 0 N/A
 Grid 3 Yes 2 5.25
 Grid 3 Yes 2 5.5


(a) (b)

Figure 3-1. CFRP grid round tubes: (a) cross sectional view and (b) longitudinal view








 ('FRP Gr'idl


 j!; >;;I
(a) (b)

Figure 3-2. CFRP grid cylinder casting in the field: (a) beginning and (b) end