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dacitea fine-grained, extrusive (volcanic) rock, intermediate in color and composition between basalt and rhyolite
dago floata 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.
dago sticka 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.
damp-proofingone or more coatings of a compound that is impervious to water applied to a surface above grade.
darbya 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.
dash-bond coata 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.
d-crackingthe 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.)
deckthe form on which concrete for a slab is placed, also the floor or roof slab itself. (see also bridge deck.)
deck or floor mortarmortar commonly used for decks or floors. it consists of sand and regular portland cement mixed with water to a firm consistency.
decoratedadorned, embellished, or made more attractive by means of color or surface detail. 
decorating firesee fire, decorating.
decorationsee decoration, inglaze; decoration, overglaze; decoration, underglaze.
decoration, inglazea ceramic decoration applied on the surface of an unfired glaze and matured with the glaze. 
decoration, overglazea ceramic or metallic decoration applied and fired on the previously glazed surface of ceramic ware. 
decoration, underglazea ceramic decoration applied directly on the surface of ceramic ware and subsequently covered with a transparent glaze. 
decorative tiletile with a ceramic decoration on the surface. (see heading under decorated and decoration.)
defectthose features which affect or have the potential of affecting the structural soundness of building stone, or may affect the durability of the building stone. sometimes used for visual features such as xenoliths or veins.
deflectiona 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.
deformation eutecticsee eutectic, deformation.
delft warea calcareous earthenware having an opaque white glaze and monochrome overglaze decorations. (originated in delft, holland.) 
dentil coursethe lower part of the cornice with dentils. the cornice is jointed to allow machines production of the dentils.
dentilssmall, rectangular blocks under a classical cornice, resembling a row of teeth.
diamond sawedfinish produced by sawing with diamound-toothed circular or gang saw.
diea covering layer of interior stone from wall to ceiling.
dimension stonequarried stones, generally two feet or more square, of a specified thickness. usually with one or more mechanically dressed surfaces.
dinnerwareceramic whiteware made in a given pattern and in a full line of articles comprising a dinner service. 
discolorationdeparture of color from that which is normal or desired.
divider stripsin 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.
d-loada constant load that in structures is due to the mass of the members, the supported structure, and permanent attachments or accessories.
dolomitethe double carbonate of lime and magnesia having the general formula caco3 mgca3. 
dolomitic limestonea limestone rich in magnesium carbonate, frequently somewhat crystalline in character, found in ledge formations in a wide variety of color tones and textures. generally speaking, its crushing and tensile strengths are greater than the oolitic limestones and its appearance shows greater variety in texture.
dope coatneat cement applied to the setting bed. double bullnose. a type of trim with the same convex radius on two opposite sides.
double headed naila nail with two heads at, or near, one end to permit easy removal; widely used in concrete formwork.
dovetail slota continuous groove with a trapezoid section resembling a dove’s tail. used to hold support rods in the back of the stone element.
dowela 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.
drain castingsee casting, drain.
dressed or hand-dressedthe cutting of rough chunks of stone by hand to create a square or rectangular shape. a stone which is sold as dressed stone generally refers to stone ready for installation. sometimes called scabbling.
dripa recess cut beneath and slightly behind projecting stone to prevent water from running down the face of the wall below.
dripstonea projecting moulding over the heads of doorways, windows and archways to throw off the rain. also known as a “hoodmould” and, when rectangular, as a “label”.
dryan open or unhealed joint plane not filled with calcite and not structurally sound.
dry edgingrough edges and corners of glazed ceramic ware due to insufficient glaze coating.  dry mix. see process, dry.
dry packconcrete or mortar mixtures deposited and consolidated by dry packing.
dry packingplacing of zero slump, or near zero slump, concrete, mortar, or grout by ramming into a confined space.
dry pressingsee pressing, dry.
dry processsee process, dry.
dry spotssmall areas on the face of tile which have been insufficiently glazed.
dry walla dry wall is a stone wall that is constructed one stone upon the other without the use of any mortar. generally used for retaining walls.
dryingremoval by evaporation, of uncombined water or other volatile substance from a ceramic raw material or product, usually expedited by low temperature heating. 
dry-set mortara 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.
dual finishtwo finishes, such as thermal and polished, on one piece of stone.
duntingthe cracking that occurs in fired ceramic bodies due to thermally induced stresses.
durabilitythe measure of the ability of natural stone to endure and to maintain its essential and distinctive characteristics of strength, resistance to decay, and appearance, with relation to a specific manner, purpose, and environment of use.
dustingthe 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.
dutchmana cut tile used as a filler in the run of a wall or floor area.
dynamitea slang term used by tilesetters when referring to a mortar accelerator.