VA 04 72 00-2011 CAST STONE MASONRY.pdf

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1、09-11 04 72 00 - 1 SECTION 04 72 00 CAST STONE MASONRY SPEC WRITER NOTE: 1. Use this section for a building stone manufactured from a mixture of Portland Cement and aggregates to simulate natural stone; generally limestone, and used as unit masonry product such as trim, copings, sills, small panels,

2、 belt courses, stools, and quoins. 2. Use Section 03 45 00, PRECAST ARCHITECTURAL CONCRETE, for large units over 600 mm (2 feet) square. 3. Delete between / _/ if not applicable to project. Also delete any other item or paragraph not applicable in the section and renumber the paragraphs. 4. Investig

3、ate use of natural cut stone before cast stone is used. 5. The designer is to prepare a narrative listing the pros and cons along with a cost estimate that leads him/her to the use of cast stone. PART 1 - GENERAL 1.1 DESCRIPTION A. This sections specifies manufactured concrete units to simulate a na

4、tural stone. B. Installation of cast stone units. 1.2 RELATED WORK A. Setting and pointing mortar: Section 04 05 13, MASONRY MORTARING / Section 04 05 16, MASONRY GROUTING. B. Joint sealant and application: Section 07 92 00, JOINT SEALANTS. C. Color and texture specified in Section 09 06 00, SCHEDUL

5、E FOR FINISHES. 1.3 SUBMITTALS A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES. B. Samples: 1. Cast stone, sample panel, size 100 by 300 by 300 mm (4 by 12 by 12 inches) each color and finish. 2. Show finish on two 100 mm (4-inch) edges and 300 by 300 mm (12 b

6、y 12 inch) surface. C. Shop Drawings: 1. Cast stone showing exposed faces, profiles, cross sections, anchorage, reinforcing, jointing and sizes. 2. Setting drawings with setting mark. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-11 04 72 00 - 2

7、 D. Certificates: Test results indicating that the cast stone meets specification requirements and proof of plant certification. E. Submit manufacturers test results of cast stone previously made by manufacturer. F. Laboratory Data: Description of testing laboratories facilities and qualifications o

8、f its principals and key personnel. G. List of jobs furnished by the manufacturer, which were similar in scope and at least three (3) years of age. 1.4 PRODUCT DELIVERY, STORAGE AND HANDLING A. Store cast stone under waterproof covers on planking clear of ground. B. Protect from handling, dirt, stai

9、n, and water damage. C. Mark production units with the identification marks as shown on the shop drawings. D. Package units and protect them from staining or damage during shipping and storage. E. Provide an itemized list of product to support the bill of lading. 1.5 WARRANTY Warranty exterior mason

10、ry walls against moisture leaks, any defects and subject to terms of “Warranty of Construction“, FAR clause 52.246-21, except that warranty period shall be two years. 1.6 APPLICABLE PUBLICATIONS A. Publications listed below form a part of this specification to extent referenced. Publications are ref

11、erenced in text by the basic designation only. Comply with applicable provisions and recommendations of the following, except as otherwise shown or specified. B. Cast Stone Institute Technical Manual and Cast Stone Institute standard specifications. C. American Society for Testing and Materials (AST

12、M): A167-99(R2009) . Stainless and Heat Resisting Chromium-Nickel Steel Plate, Sheet, and Strip A185-07 Steel, Welded Wire Fabric, Plain for Concrete A615/A615M-09 Deformed and Plain Billet-Steel Bars for Concrete Reinforcement C33-11 . Concrete Aggregates C150-09 Portland Cement C503-10 Marble Dime

13、nsion Stone (Exterior) C568-10 Limestone Dimension Stone C615-11 Granite Dimension Stone C616-10 Quartz-Based Dimension Stone C979-10 Pigments for Integrally Colored Concrete C1194-03 . Compressive Strength of Architectural Cast Stone Provided by IHSNot for ResaleNo reproduction or networking permit

14、ted without license from IHS-,-,-09-11 04 72 00 - 3 C1195-03 . Absorption of Architectural Cast Stone C1364-10 . Architectural Cast Stone. D2244-09 . Calculation of Color Differences from Instrumentally Measured Color Coordinates. 1.7 QUALITY ASSURANCE A. The Manufacturer: 1. Must have ten (5) years

15、 minimum continuous operating experience and have facilities for manufacturing cast stone as described herein. Manufacturer shall have sufficient plant facilities to produce the shapes, quantities and size of cast stone required in accordance with the project schedule. 2. Must be a member of the Cas

16、t Stone Institute. 3. Must have a certified plant (certification by the Cast Stone Institute). B. Stone setter: Must have ten (5) years experience setting cast or natural building stone. C. Testing: One (1) sample from production units may be selected at random from the field for each 500 cubic feet

17、 (14 m3) delivered to the job: 1. Three (3) field cut cube specimens from each of these sample shall have an average minimum compressive strength of not less than 85% with no single specimen testing less than 75% of design strength as specified. 2. Three (3) field cut cube specimens from each of the

18、se samples shall have an average maximum cold-water absorption of 6%. 3. Field specimens shall be tested in accordance with ASTMC 1194 and C 1195. 4. Manufacturer shall submit a written list of projects similar and at least three (3) years of age, along with owner, architect and contractor reference

19、s. 1.8 MANUFACTURING TOLERANCES A. Cross section dimensions shall not deviate by more than + 1/8 in. (3 mm) from approved dimension. B. Length of units shall not deviate by more than length /360 or + 1/8 in. (3mm), whichever is greater, not to exceed + 1/4 in (6 mm). Maximum length of any unit shall

20、 not exceed 15 times the average thickness of such unit unless otherwise agreed by the manufacturer. C. Warp bow or twist of units shall not exceed length/360 or + 1/8 in. (3 mm), whichever is greater. D. Location of dowel holes, anchor slots, flashing grooves, false joints and similar features On f

21、ormed sides of unit, 1/8 in (3 mm), on unformed sides of unit, 3/8 in (9 mm) maximum deviation. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-11 04 72 00 - 4 1.9 MOCK-UP Provide full size unit(s) for use in construction of sample wall. The mock-

22、up becomes the standard of workmanship for the project. PART 2 - PRODUCTS 2.1 ARCHITECTURAL CAST STONE A. Comply with ASTM C 1364 B. Physical properties: Provide the following: 1. Compressive Strength ASTM C 1194: 6,500 psi (45 Mpa) minimum for products at 28 days. 2. Absorption ASTM C 1195: 6% maxi

23、mum by the cold water method, or 10% maximum by the boiling method for products as 28 days. 3. Air Content ASTM C173 or C231, for wet cast product shall be 4-8% for units exposed to freeze-thaw environments. Air entrainment is not required for vibrant dry tamp (VDT) products. 4. Freeze thaw - ASTM C

24、 1364L The cumulative percent weight loss (CPWL) shall be less than 5% after 300 cycles of freezing and thawing. 5. Linear Shrinkage - ASTM C 426L Shrinkage shall not exceed 0.065%. C. Job site testing One (1) sample from production units may be selected at random from the field for each 500 cubic f

25、eet (14m3) delivered to the job site: 1. Three (3) field cut cube specimens from each of these samples shall have an average minimum compressive strength of not less than 85% with no single specimen testing less than 75% of design strength as allowed by ACI 318. 2. Three (3) field cut cube specimens

26、 from each of these samples shall have an average maximum cold-water absorption of 6%. 3. Field specimens shall be tested in accordance with ASTM C 1194 and C 1195. 2.2 RAW MATERIALS A. Portland cement Type I or Type III, white and/or grey, ASTM C 150. B. Coarse aggregates Granite, quartz or limesto

27、ne, ASTM C 33, except for gradation, and are optional for the vibrant dry tamp (VDT) casting method. C. Fine aggregates Manufactured or natural sands, ASTM C 33, except for gradation. D. Colors Inorganic iron oxide pigments, ASTM C 979 except that carbon black pigments shall not be used. E. Admixtur

28、es- Comply with the following: 1. ASTM C 260 for air-entraining admixtures. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-11 04 72 00 - 5 2. ASTM C 494/C 495 M Types A-G for water reducing, retarding, accelerating and high range admixtures. 3. O

29、ther admixtures: integral water repellents and other chemicals, for which no ASTM Standard exists, shall be previously established as suitable for use in concrete by proven field performance or through laboratory testing. 4. ASTM C 618 mineral admixtures of dark and variable colors shall not be used

30、 in surfaces intended to be exposed to view. 5. ASTM C 989 granulated blast furnace slag may be used to improve physical properties. Tests are required to verify these features. F. Water Potable G. Reinforcing bars: 1. ASTM A 615/A 615M. Grade 40 or 60 steel galvanized or epoxy coated when cover is

31、less than 1.5 in. (37 mm). 2. Welded Wire Fabric: ASTM A 185 where applicable for wet cast units. H. All anchors, dowels and other anchoring devices and shims shall be standard building stone anchors commercially available in a non-corrosive material such as zinc plated, galvanized steel, brass, or

32、stainless steel Type 302 or 304. 2.3 COLOR AND FINISH A. Match sample on file. B. All surfaces intended to be exposed to view shall have a fine-grained texture similar to natural stone, with no air voids in excess of 1/32 in. (0.8 mm) and the density of such voids shall be less than 3 occurrences pe

33、r any 1 in2 (25mm2) and not obvious under direct daylight illumination at a 5 ft. (1.5m)distance. C. Units shall exhibit a texture approximately equal to the approved sample when viewed under direct daylight illumination at a 10 ft (3m) distance. D. ASTM D 2244 permissible variation in color between

34、 units of comparable age subjected to similar weathering exposure. 1. Total color difference not greater than 6 units. 2. Total hue difference-not greater than 2 units. 2.4 REINFORCING A. Reinforce the units as required by the drawings and for safe handling and structural stress. 1. Minimum reinforc

35、ing shall be 0.25 percent of the cross section area. B. Reinforcement shall be non-corrosive where faces exposed to weather are covered with less than 1.5in. (38 mm) of concrete material. All reinforcement shall have minimum coverage of twice the diameter of the bars. Provided by IHSNot for ResaleNo

36、 reproduction or networking permitted without license from IHS-,-,-09-11 04 72 00 - 6 C. Minor chipping resulting from shipment and delivery shall not be grounds for rejection. Minor chips shall not be obvious under direct daylight illumination from a 20-ft (6m) distance. D. The occurrence of crazin

37、g or efflorescence shall not constitute a cause for rejection. E. Remove cement film, if required, from exposed surface prior to packaging for shipment. 2.5 CURING Cure units in a warm curing chamber 1000 F (537.8 C) at 95 percent relative humidity for approximately 12hours, or cure in a 95 percent

38、moist environment at a minimum 700F (371.1 C) for 16 hours after casting. Additional yard curing at 95 percent relative humidity shall be 350-degree-days (i.e. 7 days 500F (260.0 C) or 5 days 700F (371.1 C) prior to shipping. Form cured units shall be protected from moisture evaporation with curing

39、blankets or curing compounds after casting. PART 3 - EXECUTION 3.1 EXAMINATION Installing contractor shall check cast stone materials for fit and finish prior to installation. Do not set unacceptable units. 3.2 SETTING TOLERANCES A. Comply with Cast Stone Institute SM Technical Manual. B. Set stones

40、 1/8 in. (3 mm) or less, within the plane of adjacent units. C. Joints, plus 1/6 in. (1.5 mm), minus 1/8 in. (3 mm). 3.3 JOINTING A. Joint size: 1. At stone/brick joints 3/8 in. (9.5 cm). 2. At stone/stone joints in vertical position 1/4 in. (6 mm) (3/8 in. (9.5 mm) optional). 3. Stone/stone joint e

41、xposed on top 3/8 in. (.5 mm). B. Joint Materials: 1. Mortar, Type N, ASTM C 270. 2. Use a full bed of mortar at all bed joints. 3. Flush vertical joints full with mortar. 4. Leave all joints with exposed tops or under relieving angles open for sealant. 5. Leave head joints in coping and projecting

42、components open for sealant. B. Location of joints: 1. As shown on shop drawings. 2. At control and expansion joints unless otherwise shown. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-11 04 72 00 - 7 3.4 SETTING A. Drench units with clean wat

43、er prior to setting. B. Fill dowel holes and anchor slots completely with mortar or non-shrink grout. C. Set units in full bed of mortar, unless otherwise detailed. D. Rake mortar joints 3/4 in. (18 mm) in. for pointing. E. Remove excess mortar from unit faces immediately after setting. F. Tuck poin

44、t unit joints to a slight concave profile. 3.5 JOINT PROTECTION A. Comply with requirements of Section 07 92 00, JOINT SEALANTS. B. Prime ends of units, insert properly sized backing rod and install required sealant. 3.6 REPAIR AND CLEANING A. Repair chips with touchup materials furnished by manufac

45、turer. B. Saturate units to be cleaned prior to applying an approved masonry cleaner. C. Consult with manufacturer for appropriate cleaners. 3.7 INSPECTION AND ACCEPTANCE Inspect finished installation according to Bulletin #36 published by the Cast Stone Institute. - - - E N D - - - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-