Retain type of finish from subparagraphs below if needed. If more than one finish is required, add locations to finish descriptions or indicate on Drawings. Add more detailed descriptions of finishes outlined below if required when greater definition is required, such as (light), (medium), or (deep). Remove matrix to a maximum depth of one-third the average diameter of coarse aggregate but not more than one-half the diameter of smallest sized coarse aggregate. See PCI MNL 117 for more information on finishes. An as-cast finish generally results in a mottled surface or non-uniform finish.
As-Cast Surface Finish: Provide surfaces free of excessive air voids, sand streaks, and honeycombs.
Textured-Surface Finish: Impart by form liners to provide surfaces free of excessive air voids, sand streaks, and honeycombs, with uniform color and texture.
Bushhammer Finish: Use power and hand tools to remove matrix and fracture coarse aggregates.
Exposed Aggregate Finish: Use chemical retarding agents applied to concrete forms and washing and brushing procedures to expose aggregate and surrounding matrix surfaces after form removal.
Abrasive-Blast Finish: Use abrasive grit, equipment, application techniques, and cleaning procedures to expose aggregate and surrounding matrix surfaces.
Acid-Etched Finish: Use acid and hot-water solution, equipment, application techniques, and cleaning procedures to expose aggregate and surrounding matrix surfaces. Protect hardware, connections and insulation from acid attack.
Honed Finish: Use continuous mechanical abrasion with fine grit, followed by filling and rubbing procedures.
Polished Finish: Use continuous mechanical abrasion with fine grit, followed by filling and rubbing procedures.
Sand-Embedment Finish: Use selected stones placed in a sand bed in bottom of mold, with sand removed after curing.
B.Finish exposed [top] [bottom] [back] surfaces of architectural precast concrete units to match face-surface finish.
Retain paragraph above or below if applicable. Revise below to float finish or light-broom finish if smooth, steel-trowel finish is unnecessary.
C.Finish unexposed surfaces [top] [bottom] [and back] of architectural precast concrete units by smooth steel-trowel finish.
Revise finish below to light-broom, stippled, or as-cast finish if float finish is unnecessary, or upgrade to smooth, steel-trowel finish.
D.Finish unexposed surfaces of architectural precast concrete units by float finish.
2.21 SOURCE QUALITY CONTROL
Always retain paragraph below because it establishes the minimum standard of plant testing and inspecting. PCI MNL 117 mandates source testing requirements and a plant Quality Systems Manual. PCI certification also ensures periodic auditing of plants for compliance with requirements in PCI