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2. Roof pitch - Wikipedia

   en.wikipedia.org/wiki/Roof_pitch

   Roof pitch is the steepness of a roof expressed as a ratio of inch(es) rise per horizontal foot (or their metric equivalent), or as the angle in degrees its surface deviates from the horizontal. A flat roof has a pitch of zero in either instance; all other roofs are pitched .

3. Permeable paving - Wikipedia

   en.wikipedia.org/wiki/Permeable_paving

   Wood paver blocks made of Black Locust provide a highly permeable, durable surface that will last for decades because of the characteristics of the wood. [33] Black Locust Lumber wood pavers exceed 10.180 PSI (pounds per square inch) and have a Janka Hardness 1,700 lbf. [34]

4. Lift slab construction - Wikipedia

   en.wikipedia.org/wiki/Lift_slab_construction

   Lift slab construction (also called the Youtz-Slick Method) is a method of constructing concrete buildings by casting the floor or roof slab on top of the previous slab and then raising (jacking) the slab up with hydraulic jacks. This method of construction allows for a large portion of the work to be completed at ground level, negating the ...

5. Pavement condition index - Wikipedia

   en.wikipedia.org/wiki/Pavement_Condition_Index

   The pavement condition index (PCI) is a numerical index between 0 and 100, which is used to indicate the general condition of a pavement section.The PCI is widely used in transportation civil engineering [1] and asset management, and many municipalities use it to measure the performance of their road infrastructure and their levels of service. [2]

6. Waffle slab - Wikipedia

   en.wikipedia.org/wiki/Waffle_slab

   Waffle slabs are preferred for spans greater than 40 feet (12 m), because, for a given mass of concrete, they are much stronger than flat slabs, flat slabs with drop panels, two-way slabs, one-way slabs, and one-way joist slabs. [2] Section of a waffle slab including beam, ribs, and column head

7. Asphalt concrete - Wikipedia

   en.wikipedia.org/wiki/Asphalt_concrete

   Asphalt batch mix plant A machine laying asphalt concrete, fed from a dump truck. Asphalt concrete (commonly called asphalt, [1] blacktop, or pavement in North America, and tarmac or bitumen macadam in the United Kingdom and the Republic of Ireland) is a composite material commonly used to surface roads, parking lots, airports, and the core of embankment dams. [2]