Perhaps you should try some spelling variations:
recast prestressed » precast prestressed, cast prestressed, precast prestress
concrete piles » concrete plates, concrete panel, concrete problems
concrete pipe » concrete pipes, concrete pile, concrete pore

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "recast prestressed ((concrete pipe) OR (concrete piles))".
• Adding a wildcard symbol may retrieve word variants: recast prestressed ((concrete pipe) OR (concrete piles))*.