D-cracking |
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The progressive formation on a concrete surface of a
series of fine cracks at rather close intervals,
often of random patterns, but in slabs on grade
paralleling edges, joints, and cracks and usually
curving across slab corners. (Also termed D-cracks
and D-line cracks.)
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D-load |
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A constant load that in structures is due to the
mass of the members, the supported structure, and
permanent attachments or accessories.
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Dago float |
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A slang term used to describe the use of a fresh
mortar screed in lieu of float strips to rod floor
mortar. This method is commonly used in floor work.
Italian terrazzo workers use this technique to align
"concrete" for placement of brass or aluminum strips
to the desired grade.
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Dago stick |
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A slang term used by tilesetters when referring to a
small piece of wood used to rod off mortar that has
been applied to fill the holes caused by the removal
of float strips.
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Darby |
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A hand-manipulated straightedge, usually 3 to S ft.
(1 to 2.5) long, used in the early stage leveling
operations of concrete or plaster, preceding
supplemental floating and finishing.
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Dash-bond coat |
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A thick slurry of portland cement, sand, and water
flicked on surfaces with a paddle or brush to
provide a base for subsequent portland cement
plaster coats; sometimes used as a final finish on
plaster.
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Deck |
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The form on which concrete for a slab is placed,
also the floor or roof slab itself. (See also Bridge
deck.)
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Deck or floor mortar |
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Mortar commonly used for decks or floors. It
consists of sand and regular portland cement mixed
with water to a firm consistency.
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Decorated |
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Adorned, embellished, or made more attractive by
means of color or surface detail. (ASTM C 242).
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Decorating fire |
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See Fire, decorating.
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Decoration |
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See Decoration, inglaze; Decoration, overglaze;
Decoration, underglaze.
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Decoration, inglaze |
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A ceramic decoration applied on the surface of an
unfired glaze and matured with the glaze. (ASTM C
242).
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Decoration, overglaze |
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A ceramic or metallic decoration applied and fired
on the previously glazed surface of ceramic ware.
(ASTM C 242).
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Decoration, underglaze |
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A ceramic decoration applied directly on the surface
of ceramic ware and subsequently covered with a
transparent glaze. (ASTM C 242).
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Decorative tile |
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Tile with a ceramic decoration on the surface. (See
heading under Decorated and Decoration.)
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Deflection |
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A variation in position or shape of a structure or
structural element due to effects of loads or volume
change, usually measured as a linear deviation from
an established plane rather than an angular
variation.
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Deformation eutectic |
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See Eutectic, deformation.
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Delft ware |
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A calcareous earthenware having an opaque white
glaze and monochrome overglaze decorations.
(Originated in Delft, Holland.) (ASTM C 242).
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Dinnerware |
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Ceramic whiteware made in a given pattern and in a
full line of articles comprising a dinner service.
(ASTM C 242).
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Discoloration |
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Departure of color from that which is normal or
desired.
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Divider strips |
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In terrazzo work, nonferrous metal or plastic strips
of different thickness, and embedded depths usually
5/s to 1'/4 in. (10 to 40 mm), used to form panels
in the topping.
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Dolomite |
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The double carbonate of lime and magnesia having the
general formula CaCO3 MgCA3. (ASTM C 242).
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Dope coat |
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Neat cement applied to the setting bed. Double
bullnose. A type of trim with the same convex radius
on two opposite sides.
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Double headed nail |
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A nail with two heads at, or near, one end to permit
easy removal; widely used in concrete formwork.
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Dowel |
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A steel pin, commonly a plain round steel bar, which
extends into two adjoining portions of a concrete
construction, as at a joint in a pavement slab, so
as to connect the portions and transfer shear loads.
Also, as used in the construction of column and wall
sections, a deformed steel reinforcing bar placed so
as to transmit tension or compression as well as
shear loads.
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Drain casting |
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See Casting, drain.
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Dry edging |
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Rough edges and corners of glazed ceramic ware due
to insufficient glaze coating. (ASTM C 242). Dry
mix. See Process, dry.
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Dry pack |
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Concrete or mortar mixtures deposited and
consolidated by dry packing.
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Dry packing |
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Placing of zero slump, or near zero slump, concrete,
mortar, or grout by ramming into a confined space.
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Dry pressing |
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See Pressing, dry.
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Dry process |
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See Process, dry.
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Dry spots |
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Small areas on the face of tile which have been
insufficiently glazed.
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Dry-set mortar |
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A water-retentive hydraulic cement mortar usable
with or without sand. When this mortar is used,
neither the tile nor walls have to be soaked during
the installation process.
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Drying |
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Removal by evaporation, of uncombined water or other
volatile substance from a ceramic raw material or
product, usually expedited by low temperature
heating. (ASTM C 242).
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Dunting |
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The cracking that occurs in fired ceramic bodies due
to thermally induced stresses. (ASTM C 242-72)
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Dusting |
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The application of dry portland cement to a wet
floor or deck mortar surface. A pure coat is thus
formed by suction of the dry cement.
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Dutchman |
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A cut tile used as a filler in the run of a wall or
floor area.
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Dynamite |
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A slang term used by tilesetters when referring to a
mortar accelerator. |
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