The meeting at which the Biobío industrial bridge's EIS was approved was marked by protests from local residents who oppose the project.
Fraport plans to expand the airport serving Porto Alegre in southern Brazil.
Seven companies are accused of forming a cartel to carry out infrastructure works in Salvador city.
The work will need some US$8mn and take five months to complete, according to the mayor of Brazil's largest city.
The Brazilian firm is seeking US$1.1bn in reparations from the Colombian state over the cancellation of the Ruta del Sol II highway concession.
The local firm will become the sole owner of the concession.
The three contracts awarded involve total investments of US$66mn and entail building a new beltway in Amambay department and rehabilitating other roads.
The modernization of Peru's Salaverry port got underway as Grupo Romero began dredging work.