VA 09 66 13-2011 PORTLAND CEMENT TERRAZZO FLOORING.pdf

1、10-11 09 66 13 - 1 SECTION 09 66 13 PORTLAND CEMENT TERRAZZO FLOORING SPEC WRITER NOTE: Delete between /-/ if not applicable to project. Also delete any other item or paragraph not applicable in the section and renumber the paragraphs. PART 1 - GENERAL 1.1 DESCRIPTION This section covers the require

2、ments for poured-in-place cementitious terrazzo including adhesively bonded monolithic terrazzo. 1.2 RELATED WORK A. Concrete Sub Floor: Section 03 30 00, CAST-IN-PLACE CONCRETE. B. Color and location of each Terrazzo Formula: Section 09 06 00, SCHEDULE FOR FINISHES. C. Precast Terrazzo: Section 09

3、66 16, TERRAZO FLOOR TILE/Section 09 66 13, PORTLAND CEMENT TERRAZO FLOORING. 1.3 QUALITY ASSURANCE A. Comply with recommendations of National Terrazzo and Mosaic Association, Inc. (NTMA). B. Provide certification that materials provided meet or exceed specified NTMA properties. 1.4 SUBMITTALS A. In

4、 accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES, furnish following: B. Samples: Preliminary samples for approval: Each terrazzo formula size 300 mm x 300 mm (12 x 12 inches) not more than 25 mm (1 inch) thick. Divider strips: one, 150 mm (6 inch) length of each type and k

5、ind of divider strip as herein specified. C. Manufacturers Literature and Data: Cleaning and preservative solutions for terrazzo Terrazzo formula Nonslip aggregate Divider strips Adhesive for adhesively bond monolithic terrazzo 1.5 APPLICABLE PUBLICATIONS A. The publications listed below form a part

6、 of this specification to the extent referenced. The publications are referenced in the text by the basic designation only. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 09 66 13 - 2 B. American Society for Testing and Materials (ASTM): A185-

7、07 Steel Welded Wire Reinforcement, Plain, for Concrete C33-11 . Concrete Aggregates C150-09 Portland Cement C. National Terrazzo and Mosaic Association (NTMA): Terrazzo Specifications and Design Guide PART 2 - PRODUCTS 2.1 PORTLAND CEMENT ASTM C150, Type 1, nonstaining, white. 2.2 SAND ASTM C33 for

8、 fine aggregate. 2.3 MARBLE GRANULES Comply with NTMA requirements. Crushed marble chips not containing any foreign matter. Uniformly graded from 3 mm to 9 mm (1/8 inch to 3/8 inch). 2.4 COLORANT Alkali - resistant and nonfading mineral oxide pigment. 2.5 NONSLIP AGGREGATE Aluminum oxide or carborun

9、dum particles, uniformly graded from 0.8 mm to 6 mm (1/32 to 1/4 inch) and black or dark color. 2.6 NONSLIP NOSING INSERTS Precast semivitreous, dark color containing not less than thirty-five percent of nonslip aggregate bonded by vitrified ceramic material; not less than 100 mm (four inches) wide,

10、 nor less than 13 mm (1/2 inch) thick. Color as selected. 2.7 BASE BEADS Flush / projecting / type with / zinc-alloy / brass / nosing, and 24 gage galvanized steel backing. 2.8 METAL STRIPS A. / Zinc alloy / Brass / types specified below. B. Base Divider Strips: One piece, 3 mm (1/8 inch) thick, sha

11、ped to profile of base from top edges to toe edge of base. C. Floor Divider Strips (Strips): 32 mm (1-1/4 inch) deep strip with / 3 mm / 6 mm / (/ 1/8 / 1/4 / inch) thick top and / 20 / 16/ gage bottom member. D. Floor Divider Strips (T-Strips): / 3 mm / 6 mm / (/ 1/8 / 1/4 / inch) thick top with /

12、16 / 12 / gage backing 38 mm (1-1/2 inches) wide. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 09 66 13 - 3 E. Floor Divider Strips (Special): / 3 mm / 6 mm / (/ 1/8 / 1/4 / inch) thick top with offset on one side to provide bearing surface

13、for resilient flooring 32 mm (1-1/4 inches) deep. F. Floor Divider Strips (Adhesively Bonded Monolithic Terrazzo): 16 (B hold in place with cement mortar, except where specified to be held with adhesive. B. Use floor divider strips /, T-strips, / 3 mm (1/8 inch thick top) between cast-in-place terra

14、zzo base and floors, and to divide floors into approximately 750 mm (30 inch) squares, or pattern shown. C. Use floor divider strips /, T-strips, / 6 mm (1/4 inch thick top) where terrazzo abuts cement or ceramic tile. Where joints occur at door openings, set strips directly under center of doors. D

15、. Use special floor divider strips where cast-in-place terrazzo abuts resilient flooring. E. Set base divider strips plumb for cast-in-place base. Anchor and space them not over 1500 mm (5 feet) on centers, or to align with floor divider strips. Set them symmetrically at door and other openings and

16、wall breaks and in line with field divider strips of floor. SPEC WRITER NOTE: If floor divider spacing is not shown on drawings, consult Architect for spacing. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 09 66 13 - 4 F. Use floor divider, T

17、-strips for adhesive bonded monolithic terrazzo floors, located as shown on drawings. Set strips with same adhesive used for bonding terrazzo topping, and shim where necessary to produce a straight and level floor. Tightly butt strips at intersection, and install 24 hours prior to floor installation

18、. 3.2 INSTALLING TERRAZZO FLOORS A. Bonded to Concrete Terrazzo: Shall consist of an underbed and terrazzo topping on a rough concrete slab. Finish terrazzo floors a minimum of 44 mm (1-3/4 inches) above rough concrete slab. Surfaces of concrete slabs to receive terrazzo shall be cleaned of plaster,

19、 oil, grease, and foreign matter. Saturate slabs with water, remove all excess and then, immediately before placing underbed, slush and broom concrete with neat cement. Underbed shall be a minimum of 32 mm (1-1/8 inches) thick. Wet cement-sand mix to proper consistency and spread evenly over surface

20、s to receive terrazzo. Provide shrinkage reinforcement of 50 mm (2 inch) wire mesh (16 gage). Finish underbed to true, level surface, and prepare and condition it to receive terrazzo topping and ensure permanent bond. B. Monolithic Terrazzo: Shall consist of terrazzo topping placed integrally on pre

21、pared concrete slab. Broom clean concrete slabs to receive terrazzo. Before placing of terrazzo topping, saturate slabs with water until all absorption by concrete has stopped. Remove all excess water. Place terrazzo over prepared slab in one continuous operation. C. Adhesively Bonded Monolithic Ter

22、razzo: Shall consist of terrazzo topping adhesively applied to concrete slab. 1. Concrete slabs shall be clean and free of dirt, dust, oil, paint and other foreign materials. Damp mop surface before applying adhesive. On porous concrete slabs, apply a prime coat of same adhesive used for bonding ter

23、razzo topping, 24 hours in advance of application of bonding coat. 2. Install specified divider strips. 3. Apply adhesive evenly to concrete slabs to approximately 10 mils thickness. When spray or broom application is used reduce viscosity of adhesive with solvents as recommended by adhesive manufac

24、turer. Allow minimum of 1/2 hour lapse before applying bond coat. Immediately broadcast marble chips over adhesive film and continue with placing terrazzo topping in one continuous operation. D. Topping: Spread topping to provide finished thickness of 10 mm (3/8 inch) (after grinding) on vertical su

25、rfaces, and 16 mm (5/8 inch) on horizontal surfaces. Provide topping in uniform composition, and use same marble granules that appear on surface for its entire thickness. Trowel and pack base to proper form, and roll floor and thresholds with Provided by IHSNot for ResaleNo reproduction or networkin

26、g permitted without license from IHS-,-,-10-11 09 66 13 - 5 heavy roller so that terrazzo will be dense with even surface showing at least 70 percent marble granules. Lay terrazzo topping full above strips to permit grinding terrazzo down to finish floor level. 3.3 INSTALLING BASES A. Provide base 1

27、40 mm (5-1/2 inches) high, and with 25 (one inch) radius cove at bottom. Make external corners of base conform to contour of wall finish above. Provide square toe or cove at corners of floor field. B. Round top of projecting base to 6 mm (1/4 inch) radius. C. At openings having metal door frames, re

28、turn base on itself, with toe or cove in line with back edge of metal frame. 3.4 INSTALLING TERRAZZO CONCRETE STAIRS A. Divide landings and intermediate platforms into approximately 300 mm (12 inch) squares with 3 mm (1/8 inch) thick top floor divider strips. Stair treads, landings, and platforms sh

29、all finish 38 mm (1-1/2 inches) above rough concrete slab except as shown. B. Nonslip Aggregate: Sprinkle 113 grams (1/4 pound) of nonslip aggregate to each square foot of terrazzo surface for stair treads, platforms, and floor within stair wells. At stairs treads and nosing areas of stair platforms

30、, and floor landing provide tile nosing inserts or nonslip filled-grooves in addition to nonslip aggregate. C. Nosings: In addition to nonslip abrasive, install nosing edge on terrazzo treads, platforms and landings. Nosing shall be nonslip inserts extending to within four inches of ends of treads a

31、nd landings; bond them to terrazzo. In lieu of inserts, three grooves, 6 mm (1/4 inch) wide and not less than 9.5 mm (3/8 inch) deep, approximately 32 mm (1-1/4 inches) on centers, filled flush with nonslip aggregate mixed with suitable binder which will bond with terrazzo, may be used. Start groove

32、s approximately 19 mm (3/4 inch) from nosing edges and extend them continuously to within four inches of ends of treads and landings. 3.5 CURING Cure terrazzo topping at least six days before grinding and until it sets sufficiently hard to permit coarse stone grinding without dislodging surface aggr

33、egate. Curing time for terrazzo base may be reduced to four days, subject to approval of Resident Engineer. During curing period, cover terrazzo with either water proof paper, cotton mats, or one inch of clean wet sand. Lap and secure against displacement of joints in paper or mats. Keep sand (if us

34、ed) wet by sprinkling with clean water at intervals of not more than eight hours. Do final grinding or rubbing of terrazzo before finish coat of plaster or other connecting wall finish is applied. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11

35、 09 66 13 - 6 3.6 GRINDING A. After curing, wet-grind terrazzo to smooth even surface, then grout with neat white portland cement paste of creamy consistency, filling voids. Grout shall remain on surfaces not less than two days and be removed by final grinding. Grind terrazzo surfaces with electric

36、grinding machines. Where impossible to use machines, hand rub surfaces. Dry grinding of terrazzo is prohibited. B. Final grinding or rubbing to terrazzo shall remove scratches, and produce true surface of uniform color and texture, without irregularities. When tested with steel straight edge, terraz

37、zo base surfaces shall not show wave exceeding 1.6 mm (1/16 inch) between divider strips. When tested with steel straight edge 900 mm (three feet) long, floor surfaces shall not show wave exceeding 0.8 mm (1/32 inch). Protect adjacent walls, floors, and other connecting work from rubbing stones and

38、from splashing, while grinding is in progress. 3.7 CLEANING After final grinding, clean terrazzo and condition to counteract efflorescence. Apply mixture of not less than one part of liquid cleaner to three parts of water and allow it to soak uniformly into terrazzo from fifteen to thirty minutes, k

39、eeping surfaces wet. 3.8 SEALING A. After surfaces are dry, wash and rinse terrazzo and (except on terrazzo surfaces containing nonslip aggregate) apply coat of sealer. Buff terrazzo surfaces with a weighted polishing brush or electric buffing machine. B. After plastering work is completed and terra

40、zzo cleaned, wash terrazzo work with soap and water and leave in finished, polished condition. Cover and protect terrazzo until completion of the work of all other trades. 3.9 ALTERATIONS In altered rooms and areas where terrazzo floors and base occurs, patch, repair and replace existing terrazzo, a

41、nd provide new terrazzo to match existing similar work in composition, color, height, shape and finish. Use divider strips to match existing. Cure terrazzo at least six days before grinding. Then grout with neat portland cement to fill voids. After two days, remove grout by final grinding. Dry grind

42、ing is prohibited. After final grinding, clean terrazzo. After surfaces are dry, wash and rinse terrazzo, and apply coat of sealer. Buff terrazzo surfaces with electric buffing machine. - - - E N D - - - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-