Land development theory that an urban area expands, in rings. The inner ring being the business district; ring 2 has manufacturing, warehousing and some commercial activity; ring 3 is low social economic status housing; ring 4 has middle-income housing; ring 5 has new high social economic status housing.
Conceptual design
Detailed design showing an object in question.
Concession
Benefits granted by a seller/lessor to induce a sale/lease. Alternately, right granted by a governmental body, to use property for a particular type of business in a specific area.
Conclusive presumption
When evidence cannot be supported to disclaim an obvious claim such as water being wet.
Concrete
A common construction material often used for foundations, ground level floors, and sidewalks. Most concrete is made out of (1) portland cement, (2) sand, and (3) gravel or aggregate. It is commonly reinforced with steel rods (rebar) or wire screening (mesh).
Concrete block
A hollow concrete 'brick' often 8" x 8" x 16" in size. Often used in low rise commercial and some residential construction. The original design and use is attributed to the architect frank lloyd wright.
Concrete block segmental retaining wall systems
Retaining wall, mortarless concrete block made to interlock and can be fastened with fiberglass pins. A wall can be up to 5 1Ú2 feet and withstand being toppled by a combination of the weight of the block and the incline on which it is set. Higher walls need additional support or certain hardware to hold them steady. Heavier than regular block, they weigh about 70 pounds each and also come in varying colors. Walls may be straight or curved.
Concrete block wall
Wall of concrete blocks cemented with mortar.
Concrete board or wonderboard (tm)
A panel made out of concrete and fiberglass usually used as a tile backing material.
Concrete brick
Portland cement and aggregates like sand or cinders mixed into brick-sized, solid masonry blocks.
