Lightweight Concrete for High Strength - Expanded Shale & Clay

deflection readings were taken upon arrival and prior to beginning deck construction. Two weeks
after the girders were delivered to the Georgia Tech Structures Lab, composite decks were cast
on each girder. The concept for deck placement was to cast the entire deck on all six girders in
one placement. Figure C.18 shows a cross section of the formwork used to place the composite
decks.
Figure C.18 Formwork for Composite Deck
The type of concrete used for the composite deck was the standard Georgia Department
of Transportation 3,500 psi normal weight bridge deck mix. Thomas Concrete, of Atlanta,
Georgia delivered the concrete to the Structures Lab in readymix trucks.
C.3 Direct Pull-Out Test
During girder placement, 24-inch x 36-inch x 24-inch specimen blocks were cast from
the G1 and G2 series mixes for the “Mostafa”prestressing strand direct pull-out test as shown in
Figure C.19.
C-11