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P.S.I. or psi
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Pounds per square inch, a unit measure of pressure.
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Packing house tile
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Similar to quarry tile but usually of greater thickness.
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Paper and wire
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'far paper and wire mesh (or metal lath) that are used as a hacking; f
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Paper mounted ceramic mosaics
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Ceramic mosaic tiles mounted on paper. Paper is applied to face of til
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Pate dure (hard paste)
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A French term designating; ceramic whitewares fired at relatively high
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Pate tendre (soft paste)
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A French term designating ceramic whitewares fired at relatively low t
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Pavers
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Unglazed porcelain or natural clay tile formed by the dust-pressed met
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Peeling
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See Orangepeel; Shivering.
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Pencil rod
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Reinforcing steel rod with a diameter of Y4".
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Petalite
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A lithium mineral of theorical composition Li,O - A 120a ' 8Si02 which
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pH
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A simplified system of measuring acidity or alkalinity irrespective of
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Physical properties of ceramic tile
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Those properties as measured by ASTM tests.
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Pinholes
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Imperfections in the surface of a ceramic body or glaze resembling pin
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Pitted
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Indentations in the finished surface of individtial tiles other than a
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Pitting
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Development of relatively small cavities in a surface, due to phenomen
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Plaster
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A cementitious material or combination of cementitious material and ag
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Plastic cracking
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Cracking that occurs in the surface of fresh concrete soon after it is
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Plastic flow
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See Creep.
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Plastic pressing
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See Pressing, wet.
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Plasticity
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A complex property of a material involving a combination of qualities
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Plasticizer
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A material that increases plasticity of a cement paste, mortar, or con
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PLI
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Pounders per lineal inch.
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Plumb
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Perpendicular to a true level.
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Plumb scratch
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An additional scratch coat that has been applied to obtain a uniform s
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Pointing mix
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Mortar with a consistency of stiff paste. The mix is forcibly compress
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Pointing trowel
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The pointing trowel or pointer is probably the most essential tool in
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Poisson's ratio
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The ratio of transverse (lateral) strain to the corresponding axial (l
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Polychrome decoration
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A multicolor decoration. (ASTM C 242).
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Polyethylene
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A thermoplastic high-molecular-weight organic compound used in formula
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Popout
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The breaking away of small portions of a concrete surface due to inter
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Porcelain
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A glazed or unglazed vitreous ceramic white,.vare used for technical p
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Porcelain process
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The method of producing glazed ware by which a ceraunic body and glaze
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Porcelain tile
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A ceramic mosaic tile or paver that is generally made by the dust-pres
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Porosity, apparent
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The relationship of the open pore space to the bulk volume, expressed
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Post-tensioning
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A method of prestressing reinforced concrete in which tendons are tens
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Pot life
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The period of time during which a material maintains its workable prop
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Pottery
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All fired ceramic wares that contain clay when formed, except technica
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Pozzolan
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A siliceous or siliceous and aluminous material, which in itself posse
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Precast
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A concrete member that is cast and cured in other than its final posit
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Precast concrete
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Concrete cast elsewhere than its final position.
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Prefloat
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The term used to describe mortar that has been placed and allowed to h
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Pregrouted tile
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A surface unit consisting of an assembly of ceramic tile bonded togeth
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Pressing
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See Pressing, dry; Pressing, hot; Pressing, wet.
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Pressing, dry
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Forming ceramic ware in dies from powdered or granular material by dir
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Pressing, hot
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A jiggering process wherein a heated profile tool or plunger is employ
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Pressing, wet (plastic pressing)
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Forming ceramic ware in dies from a plastic body by direct pressure. (
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Prestressed concrete
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Concrete in which internal stresses of such magnitude and distribution
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Pretensioning
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A method of prestressing reinforced concrete in which the tendons are
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Primary clay (residual clay)
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A clay which remains geologically at its site of formation. (ASTM C 24
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Process
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See Process, dry; Process, wet.
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Process, dry (dry mix)
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The method of preparation of a ceramic body wherein the constituents a
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Process, wet (slip process)
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The method of preparation of a ceramic body wherein the constituents a
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Pumice
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A highly porous and vesicular lava usually of relatively high silica c
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Pumped concrete
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Concrete which is transported through hose or pipe by means of a pump.
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Pure
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See Neat cement.
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Pure coat
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A thin coat of pure portland cement which is used to bond tile to mort
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Pyrophyllite
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A hydrated aluminum silicate mineral of the theoretical composition A1
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