Oh no. The expansion packs are used for multiplayer. The guns, maps and assignments are for multiplayer, not for campaign. You said you downloaded them, but did you install them?
To check, go to my soldier in the main menu and check assignments. If you see new weapons like the X bow, Jng-90 or Acw-r for example, that means you have it.
PS3: After downloading the packs, go to the XMB screen and below games you should see the packs. Hit X and download them.
X box: It is the same as PS3.
If its on PC, start the game on Origin. Click the BF3 icon in your games library and select "show game details" then on each expansion pack right click and select download.
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