Concrete is a jillion time cheaper than plastics, and won't break down from the sun's rays, and is perfectly rigid.
Concrete and steel.
Steel and or prestressed concrete. x
Iqbal Husain has written: 'Performance of integral abutment bridges' -- subject(s): Abutments, Bridges, Bridges, Concrete, Concrete Bridges 'Semi-integral abutment bridges' -- subject(s): Abutments, Bridges, Bridges, Concrete, Concrete Bridges
Concrete and cast Iron pipes are made of cast iron and plastic piping systems normally use plastics
Steel is used for its high tensile strength and the concrete is used for its high compression strength.
Favorite materials for bridges include steel, aluminum, titanium, wood, stone, and reinforced concrete.
Older concrete bridges deteriorate because of vibration and earth movement.
Roy Edward Towe has written: 'Concrete bridge design' -- subject(s): Bridges, Bridges, Concrete, Concrete Bridges, Design and construction
Brian C Best has written: 'Abnormal loading on composite slab bridges [by] B.C. Best and R.E. Rowe' -- subject(s): Bridges, Concrete, Concrete Bridges, Strains and stresses, Testing 'Tests of a prestressed concrete bridge incorporating transverse mild-steel connectors' -- subject(s): Bridges, Concrete, Concrete Bridges, Models, Prestressed concrete, Testing
Most highway bridges and railroad bridges are simple beam bridges. In this type of construction, the road surface or deck is supported by a series of longitudinal beams made of concrete, steel or timber. These in turn rest on bearings, which reston piers or abutments.
Paul Mondorf has written: 'Concrete bridges' -- subject(s): Concrete Bridges, Design and construction, Prestressed concrete construction, Reinforced concrete construction
John R. Salmons has written: 'End connections of pretensioned I-beam bridges' -- subject(s): Bridges, Concrete, Concrete Bridges, Design and construction, Prestressed concrete beams