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2. Rigid-frame bridge - Wikipedia

   en.wikipedia.org/wiki/Rigid-frame_bridge

   Single span rigid-frame bridges are typically made of reinforced concrete and are commonly used on parkways and other roadways. [4] This design is an efficient use of material as the cross section at mid-span is relatively narrow and the amount of concrete needed at the abutments is reduced. [4]

3. Volumetric concrete mixer - Wikipedia

   en.wikipedia.org/wiki/Volumetric_concrete_mixer

   A volumetric concrete mixer (also known as volumetric mobile mixer) is a concrete mixer mounted on a truck or trailer that contains separate compartments for sand, stone, cement and water. On arrival at the job site, the machine mixes the materials to produce the exact amount of concrete needed.

4. Vibration isolation - Wikipedia

   en.wikipedia.org/wiki/Vibration_isolation

   All mechanical systems in the real world contain some amount of damping. Damping dissipates energy in the system, which reduces the vibration level which is transmitted at the natural frequency. The fluid in automotive shock absorbers is a kind of damper, as is the inherent damping in elastomeric (rubber) engine mounts.

5. Reinforced concrete - Wikipedia

   en.wikipedia.org/wiki/Reinforced_concrete

   Concrete is a mixture of coarse (stone or brick chips) and fine (generally sand and/or crushed stone) aggregates with a paste of binder material (usually Portland cement) and water. When cement is mixed with a small amount of water, it hydrates to form microscopic opaque crystal lattices encapsulating and locking the aggregate into a rigid shape.

6. Permeable paving - Wikipedia

   en.wikipedia.org/wiki/Permeable_paving

   Permeable interlocking concrete pavements are concrete units with open, permeable spaces between the units. [ 28 ] : 2 More recently manufacturers have introduced styles with smaller joint allowing for better ADA compliance and still capturing a significant amount of stormwater.

7. Waffle slab - Wikipedia

   en.wikipedia.org/wiki/Waffle_slab

   A waffle slab is flat on top, while joists create a grid like surface on the bottom. The grid is formed by the removal of molds after the concrete sets. This structure was designed to be more solid when used on longer spans and with heavier loads. [3]