Exam 2 Voc and Quiz Q Flashcards
A concrete surface lying upon, and supported directly by, the ground beneath.
Slab on grade:
The mineral waste that rises to the top of molten iron or steel or to the top of a weld.
Slag:
A slot or groove intended to create an opening too large to be bridged by a drop of water and, thereby, to eliminate the passage of water by capillary action;
Capillary break:
A membrane used to resist the migration of liquid water through a floor, wall, or roof.
Moisture barrier:
A strip of wood, metal, or plaster that establishes the level to which concrete or plaster will be placed.
Screed:
A long-handled tool used for the initial floating of a freshly poured concrete slab.
Bull float:
A stiff straightedge of wood or metal used to level the surface of wet plaster or concrete.
Darby:
In freshly placed concrete, water that rises to the top surface of the concrete as the solid cement and aggregate particles settle.
Bleed water:
A metal-bladed tool used in the final stages of finishing of a concrete slab.
Steel trowel:
A skid-resistant texture imparted to an uncured concrete surface by dragging a stiff-bristled broom across it.
Broom finish:
A step in the finishing of concrete slabs for the purpose of removing minor undulations produced during floating or troweling.
Restraightening:
To strike off the surface of a concrete slab using screeds and a straight piece of lumber or metal; as a noun, a long, straight item, used to perform straightedging, test the flatness of a surface, or trace a straight line.
Straightedge:
A dry powder that is dusted onto the surface of a concrete slab before troweling to react with the concrete and produce a hard wearing surface for industrial use.
Shake-on hardener:
A liquid that, when sprayed on the surface of newly placed concrete, forms a water-resistant layer to prevent premature dehydration of the concrete.
Curing compound:
A concrete slab finished to a high degree of flatness and levelness according to a recognized system of measurement.
Superflat floor:
An index number expressing the statistical flatness or levelness of a concrete slab.
F-number:
An intentional, linear discontinuity in a structure or component designed to form a plane of weakness where cracking can occur in response to various forces so as to minimize or eliminate cracking elsewhere.
Control joint or contraction joint
A type of joint used to separate abutting materials or assemblies that should remain structurally independent, such as where new construction meets old, or where a nonstructural slab on grade abuts structural columns or walls.
Isolation joint:
Specially formulated cement, used to counteract the drying shrinkage that normally occurs during curing.
Shrinkage-compensating cement:
A slot formed into a concrete surface for the purpose of interlocking with a subsequent pour of concrete; a slot at the edge of a precast member into which grout will be poured to lock it to an adjacent member; a mechanical interlocking of plaster with lath.
Key:
A short cylindrical rod of wood or steel
Dowel:
A steel or plastic rod with fasteners on either end, used to hold together the two surfaces of formwork for a concrete wall.
Form tie:
A horizontal beam used to support sheeting or concrete formwork.
Waler:
A depression, typically conical in shape, in a cast-in-place concrete wall that remains after the protruding portions of a form tie are removed.
Form tie hole: