compression failure. Specimen 3 had no grid in the 6-foot center section of the length

(see Fig 5-4) while specimen 4 had identical CFRP grid arrangement as specimen 2 (see

Fig. 5-3).

 Centerline


 616

 1 Grid Layer No Grid 1 Grid Layer
 7' 6' 7'

 20'


Figure 5-4. Longitudinal view of specimen 3

 All specimens were cast using a standard concrete pump mixture with a maximum

aggregate size of 0.375 in. The specified 28-day compressive strength of the mixture was

5000 psi.

 Round Sonotubes, 16-in. diameter, were used as formwork for specimen 2, 3 and 4

(see Fig. 5-5). Wood formwork was used for specimen 1 (see Fig. 5-6).



 I7baaa/


Figure 5-5. Placement of concrete (specimens 2, 3 and 4)