36C24418B0594-0001005.pdf

VA Medical Center, Coatesville Pa

542-18-108 Smoke Shelter

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SECTION 32 05 23

CEMENT AND CONCRETE FOR EXTERIOR IMPROVEMENTS

PART 1 - GENERAL

1. Concrete pour in grade slab shall consist of

A. 6” 4,000 psi concrete slab

B. 6x6 10 gauge Wire fabric

C. 4” Crushed Stone (compact)

D. Geofabric

2. Concrete pour in concrete sidewalks: Contractor shall construct the side walk as per VA design Detail.

A. 4” deep 4,000 psi concrete slab

1.1 SUMMARY

A. Section Includes:

1. Subbase for concrete pavements.

2. Pedestrian Pavement: grade slabs.

1.2 RELATED REQUIREMENTS

A. Field Testing: Section 01 45 29, TESTING LABORATORY SERVICES.

B. Subgrade Preparation and Subbase Compaction: Section 31 20 00, EARTHWORK.

1.3 APPLICABLE PUBLICATIONS

A. Comply with references to extent specified in this section.

B. American Association of State Highway and Transportation Officials

(AASHTO):

1. M147-65-UL-04 - Materials for Aggregate and Soil-Aggregate Subbase, Base and Surface Courses.

2. M233-86 - Boiled Linseed Oil Mixture for Treatment of Portland

Cement Concrete.

C. American Concrete Institute (ACI):

1. 305R-10 - Guide to Hot Weather Concreting.

2. 306R-10 - Guide to Cold Weather Concreting.

D. American National Standards Institute (ANSI):

1. B101.3 - Wet DOCF of Common Hard Surface Floor Materials (Including

Action and Limit Thresholds for the Suitable Assessment of the

Measured Values).

E. ASTM International (ASTM):

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1. A615/A615M-16 - Deformed and Plain Carbon Steel Bars for Concrete

Reinforcement.

2. A996/A996M-15 - Rail-Steel and Axle-Steel Deformed Bars for Concrete

Reinforcement.

3. A1064/A1064M-16 - Carbon-Steel Wire and Welded Wire Reinforcement, Plain and Deformed, for Concrete.

4. C33/C33M-16 - Concrete Aggregates.

5. C94/C94M-16 - Ready Mixed Concrete.

6. C143/C143M-15a - Slump of Hydraulic Cement Concrete.

7. C150/C150M-16 - Portland Cement.

8. C171-16 - Sheet Materials for Curing Concrete.

9. C260/C260M-10a - Air Entraining Admixtures for Concrete.

10. C309-11 - Liquid Membrane Forming Compounds for Curing Concrete.

11. C494/C494M-15a - Chemical Admixtures for Concrete.

12. C618-15 - Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete.

13. C979/C979M-16 - Pigments for Integrally Colored Concrete.

14. C989/C989M-14 - Slag Cement for Use in Concrete and Mortars.

15. C1240-15 - Silica Fume Used in Cementitious Mixtures.

16. D1751-04(2013)e1 - Preformed Expansion Joint Filler for Concrete

Paving and Structural Construction (Nonextruding and Resilient

Bituminous Types).

17. D5893/D5893M-10 - Cold Applied, Single Component, Chemically Curing

Silicone Joint Sealant for Portland Cement Concrete Pavements.

18. D6690-15 - Joint and Crack Sealants, Hot Applied, for Concrete and

Asphalt Pavements.

1.4 PREINSTALLATION MEETINGS

A. Conduct preinstallation meeting at project site minimum 3 days before concrete pour.

1. Required Participants:

a. Contracting Officer's Representative.

b. Contractor.

c. Installer.

1.5 SUBMITTALS

A. Submittal Procedures: Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES.

B. Submittal Drawings:

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1. Show size, configuration, and fabrication and installation details.

2. Show reinforcing.

3. Include jointing plan for concrete pavements, curbs and gutters.

C. Manufacturer's Literature and Data:

1. Description of each product.

2. Installation instructions.

D. Test reports: Certify products comply with specifications.

1. Concrete materials.

2. Select subbase materials.

3. Field test reports.

E. Certificates: Certify products comply with specifications.

1. Reinforcement.

2. Expansion joint filler.

3. Concrete protective coating.

4. Curing Materials.

F. Qualifications: Substantiate qualifications comply with specifications.

1. Installer.

G. Concrete mix design.

H. Select subbase job-mix design.

1.6 QUALITY ASSURANCE

A. Installer Qualifications:

1. Regularly installs specified products.

2. Installed specified products with satisfactory service on five similar installations.

a. Project Experience List: Provide contact names and addresses for completed projects.

B. Land Surveyor: Professional land surveyor or engineer registered to provide land surveys in jurisdiction where project is located.

C. Preconstruction Testing:

1. Engage independent testing laboratory to perform tests and submit reports.

a. Deliver samples to laboratory in number and quantity required for testing.

2. Concrete mix design.

3. Select subbase job-mix design. Report the following:

a. Material sources.

b. Gradation.

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c. Plasticity index.

d. Liquid limit.

e. Laboratory compaction curves indicating maximum density at optimum moisture content.

1.7 DELIVERY

A. Deliver steel reinforcement to prevent damage.

B. Before installation, return or dispose of distorted or damaged steel reinforcement.

C. Bulk Products: Deliver bulk products away from buildings, utilities, pavement, and existing turf and planted areas. Maintain dry bulk product storage away from contaminants.

1.8 STORAGE AND HANDLING

A. Store products indoors in dry, weathertight facility.

B. Protect products from damage during handling and construction operations.

1.9 FIELD CONDITIONS

A. Hot Weather Concreting Procedures: ACI 305R.

B. Cold Weather Concreting Procedures: ACI 306R.

1. Use non-corrosive, non-chloride accelerator admixture.

2. Do not use calcium chloride, thiocyanates or admixtures containing more than 0.05 percent chloride ions.

1.10 WARRANTY

A. Construction Warranty: FAR clause 52.246-21, "Warranty of

Construction."

PART 2 - PRODUCTS

2.1 CONCRETE MATERIALS

A. Portland Cement: ASTM C150/C150M, Type.

B. Coarse Aggregate: ASTM C33/C33M; size ¾” to suit application.

C. Mixing Water: Fresh, clean, and potable.

D. Welded Wire Fabric: ASTM A1064/A1064M, deformed; Grade 485 (70.

E. Expansion Joint Filler: ASTM D1751.

2.2 SELECT SUBBASE

A. Subbase: AASHTO M147; Grade B.

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1. Select granular material composed of sand, sand-gravel, crushed stone, crushed or granulated slag, with or without soil binder, or combinations of these materials.

SUBBASE GRADING REQUIREMENTS

Sieve Size Percentage Passing by Mass

Grades

(mm) (in) A B C D E F

50 2 100 100

25 1 75-95 100 100 100 100

9.5 3/8 30-65 40-75 50-85 60-100

4.47 No. 4 25-55 30-60 35-65 50-85 55-100 70-100

2.00 No. 10 15-40 20-45 25-50 40-70 40-100 55-100

0.425 No. 40 8-20 15-30 15-30 25-45 20-50 30-70

0.075 No. 200 2-8 5-20 5-15 5-20 6-20 8-25

2.3 FORMS

A. Forms: Wood, plywood, metal, or other materials, approved by

Contracting Officer's Representative, of grade or type suitable to obtain type of finish specified.

1. Plywood: Exterior grade, free of defects and patches on contact surface.

2. Lumber: Sound, grade-marked, S4S stress graded softwood, minimum

50 mm (2 inches) thick, free from warp, twist, loose knots, splits, or other defects.

3. Form Coating: As recommended by Architect/Engineer.

B. Provide forms suitable in cross-section, depth, and strength to resist springing during depositing and consolidating concrete.

1. Do not use forms varying from straight line more than 3 mm in

3000 mm (1/8 inch in 10 feet), horizontally and vertically.

C. Provide flexible or curved forms for forming radii.

2.4 CONCRETE MIXES

A. Design concrete mixes according to ASTM C94/C94M, Option C.

B. Concrete Type: Non-air-entrained. See Table I.

TABLE I - CONCRETE TYPES

Concrete Minimum 28 Day Non-Air-Entrained Air-Entrained

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C. Maximum Slump: ASTM C143/C143M. See Table II.

TABLE II - MAXIMUM SLUMP

APPLICATION MAXIMUM SLUMP

Curb & Gutter 75 mm (3 inches)

Pedestrian Pavement 75 mm (3 inches)

Vehicular Pavement 50 mm (2 inches) Machine Finished

100 mm (4 inches) Hand Finished

Equipment Pad 75 to 100 mm (3 to 4 inches)

2.5 ACCESSORIES

A. Equipment and Tools: Obtain Contracting Officer's Representative's, approval of equipment and tools needed for handling materials and performing work before work begins.

B. Maintain equipment and tools in satisfactory working condition.

C. Sealants:

1. Concrete Paving Expansion Joints: ASTM D5893/D5893M, Type SL, single component, self-leveling, silicone joint sealant.

2. Concrete Paving Joints: ASTM D6690, Type IV, hot-applied, single component joint sealant.

D. Concrete Protective Coating: AASHTO M233 linseed oil mixture.

Type Compressive

Strength f'c

MPa (psi)

Min. Cement kg/cu. m

(lbs./cu. yd.)

Max.

Water

Cement

Ratio

Min. Cement kg/cu. m

(lbs./cu. yd.)

Max.

Water

Cement

Ratio

A 35 (5000)1,3 375 (630) 0.45 385 (650) 0.40

B 30 (4000)1,3 325 (550) 0.55 340 (570) 0.50

C 25 (3000)1,3 280 (470) 0.65 290 (490) 0.55

D 25 (3000)1,2 300 (500) * 310 (520) *

Footnotes:

1. If trial mixes are used, achieve compressive strength 8.3 MPa (1,200 psi) in excess of f'c. For concrete strengths greater than 35 MPa (5,000 psi), achieve compressive strength 9.7 MPa (1,400 psi) in excess of f’c.

2. For Concrete Exposed to High Sulfate Content Soils: Maximum water cement ratio is 0.44.

3. Laboratory Determined according to ACI 211.1 for normal weight concrete.

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PART 3 - EXECUTION

3.1 PREPARATION

A. Examine and verify substrate suitability for product installation.

B. Protect existing construction and completed work from damage.

C. Prepare, construct, and finish subgrade. See Section 31 20 00, EARTHWORK.

D. Maintain subgrade in smooth, compacted condition, in conformance with the required section and established grade until the succeeding operation has been accomplished.

3.2 SELECT SUBBASE

A. Placing:

1. Place subbase material on prepared subgrade in uniform layer to required contour and grades, and to maximum 200 mm (8 inches) loose depth.

2. When required compacted thickness exceeds 150 mm (6 inches), place subbase material in equal thickness layers.

3. When subbase elevation is 13 mm (1/2 inch) or more below required grade, excavate subbase minimum 75 mm (3 inches) deep. Place and compact subbase to required grade.

B. Compaction:

1. Perform compaction with approved hand or mechanical equipment well suited to the material being compacted.

2. Maintain subbase at optimum moisture content for compaction.

3. Compact each subbase layer to minimum 95 percent or 100 percent of maximum density as specified in Section 31 20 00, EARTHWORK.

C. Subbase Tolerances:

1. Variation from Indicated Grade: Maximum 9 mm (3/8 inch).

2. Variation from Indicated Thickness: Maximum 13 mm (1/2 inch).

D. Protection:

1. Protect subbase from damage until concrete is placed.

2. Reconstruct damaged subbase before placing concrete.

3.3 SETTING FORMS

A. Form Substrate:

1. Compact form substrate to uniformly support forms along entire length.

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2. Correct substrate imperfections and variations by cutting, filling, and compacting.

B. Form Setting:

1. Set forms to indicated line and grade with tight joints. Rigidly brace forms preventing movement.

2. Remove forms when removal will not damage concrete and when required for finishing.

3. Clean and oil forms before each use.

4. Correct forms, when required, immediately before placing concrete.

C. Form Tolerances:

1. Variation from Indicated Line: Maximum 6 mm (1/4 inch).

2. Variation from Indicated Grade: Maximum 3 mm in 3000 mm (1/8 inch in

10 feet).

3.4 PLACING REINFORCEMENT

A. Keep reinforcement clean from contamination preventing concrete bond.

B. Install reinforcement shown on drawings.

C. Support and securely tie reinforcing steel to prevent displacement during concrete placement.

D. Obtain Contracting Officer's Representative's reinforcement placement approval before placing concrete.

3.5 JOINTS - GENERAL

A. Place joints, where shown on approved submittal Drawings.

1. Conform to details shown.

2. Install joints perpendicular to finished concrete surface.

B. Make joints straight and continuous from edge to edge of pavement.

3.6 CONSTRUCTION JOINTS

A. Locate longitudinal construction joints between slabs of vehicular pavement as shown on approved submittal Drawings.

B. Place transverse construction joints of type shown, where indicated, and whenever concrete placement is suspended for more than 30 minutes.

C. Provide butt-type joint with dowels in curb and gutter at planned joint locations.

D. Provide keyed joints with tie bars when joint occurs in middle third of planned curb and gutter joint interval.

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3.7 CONTRACTION JOINTS

A. Tool or cut joints to width, depth, and radius edge shown on drawings using grooving tool, jointer, or saw.

B. Construct joints in curbs and gutters by inserting 3 mm (1/8 inch) steel plates conforming to curb and gutter cross sections.

1. Keep plates in place until concrete can hold its shape.

C. Finish joint edges with edging tool.

D. Score pedestrian pavement with grooving tool or jointer.

3.8 EXPANSION JOINTS

A. Form expansion joints with expansion joint filler of thickness shown on drawings.

1. Locate joints around perimeter of structures and features abutting site work concrete.

2. Create complete, uniform separation between structure and site work concrete.

B. Extend expansion joint material full depth of concrete with top edge of joint filler below finished concrete surface where sealant is indicated on Drawings.

C. Cut and shape material matching cross section.

D. Anchor with approved devices to prevent displacing during placing and finishing operations.

E. Round joint edges with edging tool.

3.9 PLACING CONCRETE - GENERAL

A. Preparation before Placing Concrete:

1. Obtain Contracting Officer's Representative approval.

2. Remove debris and other foreign material.

3. Uniformly moisten substrate, without standing water.

B. Convey concrete from mixer to final location without segregation or loss of ingredients. Deposit concrete to minimize handling.

C. During placement, consolidate concrete by spading or vibrating to minimize voids, honeycomb, and rock pockets.

1. Vibrate concrete against forms and along joints.

2. Avoid excess vibration and handling causing segregation.

D. Place concrete continuously between joints without bulkheads.

E. Install construction joint in concrete placement suspended for more than 30 minutes.

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F. Replace concrete with cracks, chips, bird baths, and other defects to nearest joints, approved by Contracting Officer's Representative.

3.10 FORM REMOVAL

A. Keep forms in place minimum 12 hours after concrete placement. Remove forms without damaging concrete.

B. Do not use bars or heavy tools against concrete to remove forms. Repair damage concrete found after form removal.

3.11 CONCRETE FINISHING - GENERAL

A. Follow operation sequence below, unless otherwise indicated on

Drawings:

1. Consolidating, floating, striking, troweling, texturing, and joint edging.

B. Use edging tool with 6 mm (1/4 inch) radius.

C. Keep finishing equipment and tools clean and suitable for use.

3.12 CONCRETE FINISHING - PEDESTRIAN PAVEMENT

A. Grade Slabs:

1. Finish concrete surfaces with metal float, troweled smooth, and finished with a broom moistened with clear water.

2. Finish slab edges and formed transverse joints with edger.

3. Broom surfaces transverse to traffic direction.

a. Use brooming to eliminate flat surface produced by edger.

b. Produce uniform corrugations, maximum 1.5 mm (1/16 inch) deep profile.

4. Provide surface uniform in color and free of surface blemishes, form marks, and tool marks.

5. Paving Tolerances:

a. Variation from Indicated Plane: Maximum 5 mm in 3000 mm (3/16 inch in 10 feet).

b. Variation from Indicated Thickness: Maximum 6 mm (1/4 inch).

6. Replace paving within joint boundary when paving exceeds specified tolerances.

3.13 CONCRETE CURING

A. Concrete Protection:

1. Protect unhardened concrete from rain and flowing water.

2. Provide sufficient curing and protection materials available and ready for use before concrete placement begins.

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3. Protect concrete to prevent pavement cracking from ambient temperature changes during curing period.

a. Replace pavement damaged by curing method allowing concrete cracking.

b. Employ another curing method as directed by Contracting

Officer's Representative.

B. Cure concrete for minimum 7 days by one of the following methods appropriate to weather conditions preventing moisture loss and rapid temperature change:

1. Burlap Mat: Provide minimum two layers kept saturated with water during curing period. Overlap Mats at least 150 mm (6 inches).

2. Sheet Materials:

a. Wet exposed concrete surface with fine water spray and cover with sheet materials.

b. Overlap sheets minimum 300 mm (12 inches).

c. Securely anchor sheet materials preventing displacement.

3. Curing Compound:

a. Protect joints indicated to receive sealants preventing contamination from curing compound.

b. Insert moistened paper or fiber rope into joint or cover joint with waterproof paper.

c. Apply curing compound before concrete dries.

d. Apply curing compound in two coats at right angles to each other.

e. Application Rate: Maximum 5 sq. m/L (200 sq. ft./gallon), both coats.

f. Immediately reapply curing compound to surfaces damaged during curing period.

3.14 CLEANING

A. After completing curing:

1. Remove burlap and sheet curing materials.

2. Sweep concrete clean, removing foreign matter from the joints.

3. Seal joints as specified.

3.15 PROTECTION

A. Protect exterior improvements from traffic and construction operations.

1. Prohibit traffic on paving for minimum seven days after placement, or longer as directed by Contracting Officer's Representative.

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B. Remove protective materials immediately before acceptance.

C. Repair damage.

1. Replace concrete containing excessive cracking, fractures, spalling, and other defects within joint boundary, when directed by

Contracting Officer's Representative, and at no additional cost to the Government.

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