03_31_00_CAST-IN-PLACE_CONCRETE_ADDEN3_0003.pdf

GOGA – 212511 03 31 00 - 1 CAST-IN-PLACE CONCRETE

SECTION 03 31 00 - CAST-IN-PLACE CONCRETE

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Work Included: Furnish and install cast-in-place concrete required for the project as shown on the Drawings and specified herein. This Section also includes:

1. Concrete for work specified in Mechanical and Electrical Divisions unless specifically included therein.

2. Grouting of structural steel setting plates and elevator sills (if required).

3. Grouting of bases and equipment not specified under other Sections.

4. Coordination with other trades with regard to requirements for special bases, sleeves, chases, inserts, finishes or provisions of any nature.

5. Curing of formed concrete surfaces.

6. Installation of anchor bolts, hangers, anchors, plates, inserts and miscellaneous metal or other materials embedded in concrete, which are furnished by other trades.

B. Related Work Specified Elsewhere:

1. Section 03 11 13 “Concrete Forming and Accessories”.

2. Section 03 21 00 “Concrete Reinforcement”.

3. Section 03 37 13 “Shotcrete”.

4. Section 03 35 00 “Concrete Finishing”.

5. Section 31 20 00 “Earth Moving”.

6. Section 32 16 00 “Curbs, Gutters, Sidewalks and Driveways”.

1.3 SUBMITTALS

A. Mix Designs.

1. Mix designs shall indicate, completely, types of cements and admixtures; quantities, size and source of all aggregates, slump, strength and water cement ratios.

B. Product Data: Submit manufacturer's product data with application and installation instructions for all proprietary materials and products, including forming and reinforcement accessories, patching compounds, joint systems, and applied materials.

C. Material Certificates: For each of the following, signed by the manufacturers:

1. Cementitious materials.

2. Admixtures

3. Curing Compounds

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4. Bonding agents

5. Floor and slab treatments.

D. Shop Drawings: Submit shop drawings for formwork and reinforcement in accordance with the requirements of Sections 03 11 13 and 03 21 00, and ACI 315.

E. Laboratory Test Reports: Submit laboratory test reports for concrete materials, mix designs, and field quality control testing as specified herein.

1.4 REFERENCES, CODES AND STANDARDS

A. "Building Code Requirements for Reinforced Concrete", ACI 318-14.

B. California Historical Building Code, 2019 Edition.

1.5 SOURCE QUALITY CONTROL

A. Refer to quality Control Section for general requirements governing testing and inspection.

B. Cement and Aggregates: Furnish to the Contracting Officer the following data:

1. Mill certificates from cement manufacturer certifying that cement meets Specifications and is suitable for purpose intended.

2. Proof of aggregate's compatibility with cement to be used and certification that aggregates meet Specifications. Contracting Officer reserves the right to have his testing agency perform any additional tests on cement and aggregates which may be deemed advisable.

1.6 ENVIRONMENTAL CONDITIONS

A. Cold Weather Requirements: Comply with ACI 306R, "Cold Weather Concreting".

B. Hot Weather Requirements: Comply with ACI 305, "Hot Weather Concreting".

PART 2 - PRODUCTS

2.1 MATERIALS

A. Cement: ASTM C 150, Type II. Cement shall be of same brand, type and source throughout Project.

B. Aggregates:

1. Concrete for Slabs On Grade, suspended slabs: ASTM C 33 from sources with proven history of successful use. Source shall be constant unless 10 days prior notice is given for approval after re-check of mix design.

a. Fine Aggregate: Sechelt or Orcas sands.

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b. Coarse Aggregate: Granite Rock Co., Kaiser Limestone or Kaiser Clayton, Sechelt or Orcas aggregates.

c. Other aggregates may be submitted for use provided the concrete mix meets the following shrinkage criteria: .040% drying shrinkage (max.), as tested per Structural Engineers Association of California recommendation, May 1989.

2. All Other Concrete: ASTM C 33 from sources with proven history of successful use.

Source shall be constant unless 10 days prior notice is given for approval after re-check of mix design.

a. Fine Aggregate: Natural sand with sand equivalent of not less than 75 when tested per Test Method Calif. 217-E. Radum sand, or approved equal.

b. Coarse Aggregate: Fine grain, sound crushed stone, natural gravel or granite with cleanness value not less than 75 when tested as per Test Method Calif. 227. Granite Rock Co., Kaiser Limestone or Kaiser Clayton.

C. Water: Clean and potable, free from impurities detrimental to concrete.

D. Admixtures: The use of admixtures shall be confined to those admixtures listed below.

Admixtures containing chlorides are not permitted. Admixtures shall be batched in strict accordance with manufacturer's recommendations.

1. Chemical Admixtures:

a. Water Reducing Admixture: W.R. Grace Co. "WRDA-79", Master Builders "Pozzolith 200N" or Sika Chemical Corp. "Plastocrete 161". Admixture shall conform to ASTM C 494, Type A and shall not contain more chloride ions than are present in the municipal drinking water.

b. High-Range Water Reducing Admixture: W.R. Grace Co. "WRDA-19" or approved equal. Admixture shall conform to ASTM C494 Type F and shall not contain more chloride ions than are present in the municipal drinking water.

c. Mid-Range Water Reducing Admixture: W.R. Grace Co., Daracon 50, 55, 04 65, or approved equal. Admixtures should conform to ASTM C494 Type A/F and shall not contain more chloride ions than are present in the municipal drinking water.

d. Air Entraining Agent: Air-entraining admixture conforming with ASTM C260 may be introduced into the mix. Air-entrainment shall not exceed 4 percent. Submit manufacturer's data to Contracting Officer for review.

e. Flyash: Pozzolanic admixtures, conforming with ASTM C618, Class F, with weight loss on ignition limited to 3%, may be utilized in mix designs where indicated on structural drawings. Maximum cement replacement shall be 15% by weight, unless otherwise noted on drawings.

f. Ground Granulated Blast Furnace Slag Cement (GGBFS): Slag Cement shall conform to ASTM C989 or AASHTO M302 Grade Level 100 or 120.

g. Crystalline Waterproofing Additive: Zypex crystalline waterproofing admixture, Admix C-1000 or C-2000, by Xypex Chemical Corporation, or approved equal.

h. Recycled Carbon Dioxide (CO2) with a 99% purity from a post-industrial source.

Acceptable suppliers are CarbonCure Technologies (www.carboncure.com) or approved equal.

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2. Certification: Written conformance to above requirements and the chloride ion content of the admixture shall be submitted by the admixture manufacturer prior to review of mix designs by the Architect.

E. Expansion Joint Fillers: ASTM D 994, asphaltic compound strips, 1/2" thick unless otherwise noted, precut to proper size.

F. Non-Shrink Grout (Non-Metallic): Euclid Chemical Co. "Euco N-S", L&M "Crystex", Upco "Upcon", U.S. Grout Corp. "Five Star", Master Builders "Masterflow 713", or approved equal, nonmetallic, nonstaining, premixed grout having a compressive strength at 28 days of not less than 6800 psi, non-shrink at all flow levels. Grout shall conform to ASTM C1107.

G. Curing Compounds (Formed Concrete): Conform to requirements of Concrete Finishes Section (for Clear Curing and Sealing Compound).

H. Volclay Waterstops: Bentonite/butyl rubber-based waterstop, RX-101 series by CETCO Building Materials Group, or approved equal.

2.2 MIXES

A. Mix Designs:

1. Mix designs for concrete shall be Contractor-designed at his expense. Designs shall be prepared by a qualified agency approved by the Contracting Officer and Structural Engineer. Mix designs shall be submitted for Contracting Officer and Structural Engineer review at least 30 days prior to placing any concrete and shall indicate completely, brands, types and quantities of admixtures included. If concrete is to be placed by pumping, recommendations of ACI Committee 304 shall be followed.

2. Mix designs shall be proportioned in accordance with Section 5.3, "Proportioning on the Basis of Field Experience and/or Trial Mixtures" of ACI 318. Submit mix designs for each class of concrete for review.

B. Structural Drawings indicate minimum compressive strengths, slumps, maximum size aggregates and minimum cement contents.

PART 3 - EXECUTION

3.1 MIXING

A. Concrete shall be ready mixed as per ASTM C 94a. Equipment shall be adequate for the purpose and kept in good mechanical condition at all times.

B. The rate of delivery, haul time, mixing time and hopper capacity shall be such that mixed concrete delivered shall be placed in the forms within 90 minutes or 300 revolutions of the drum from the time of introduction of cement and water to the mixer. Any interruption in placing in excess of 90 minutes or 300 revolutions will be cause for shutdown of the work for the day and the wasting of any remaining mixed concrete in hoppers or mixers. In case such interruption occurs, the Contractor shall provide construction joints where and as directed and cut concrete back to such

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line, cleaning forms and reinforcing as herein specified. Delivery tickets shall show departure time from plants. Revolution counters shall be set at "0" and shall commence to operate when drum revolution begins after introduction of ingredients into the mixer.

C. No water shall be added to the mix after the initial introduction of mixing water for the batch except when, on arrival at the job site, the slump of the concrete is less than that specified. In this case, and only under the direction of the Special Inspector and with not more than one application per load, additional water may be added from the truck system to bring the slump within required limits. The drum or blades shall then be turned an additional 30 revolutions or more until mix is uniform.

D. Mixers shall be equipped with an automatic device for recording number of revolutions of drum or blades prior to completion of mixing operation.

E. Concrete shall be kept continuously agitated until discharged into the hopper at the job site.

F. Contractor shall note that the appearance of unpainted exposed concrete surfaces depends upon uniform color and texture within any one area and between adjacent areas and he shall exercise strict batching and mixing controls to achieve this end.

3.2 PLACING

A. Absorbent forms shall be thoroughly wetted before concrete is placed. Aggregate base for slabs on grade shall be moist but not saturated when concrete is placed.

B. Placing of concrete shall be done immediately after mixing. No concrete shall be placed or used after it has begun to set and no retempering will be allowed. The method used in placing shall be such that concrete is conveyed to place and deposited without separation of the ingredients. No concrete shall be placed with a free unconfined fall in excess of six (6) feet. Concrete shall not be allowed to cascade through reinforcing steel in such manner as to promote segregation. Do not support runways on reinforcing steel.

C. Splash or accumulations of hardened or partially hardened concrete shall be removed. Contact faces of forms for exposed concrete shall be protected from splash during placing of adjacent concrete. Concrete containing piping shall be placed in a manner that will prevent damage to pipes.

D. Deposit concrete in approximate horizontal layers not exceeding 18" in thickness, unless otherwise authorized. Placing of concrete shall be carried on in a continuous operation without interruption until placing of course, section, panel or monolith is completed.

E. Distribution of concrete shall be even and continuous and no placement joints shall show. Before a placement is started, make certain that adequate equipment, men, and concrete will be available to place in cycles which will permit proper and thorough integration of each layer of concrete.

Upon stopping of a placement, the top surface shall be on a level. Points of deposit in walls shall be so spaced that it will not be necessary for concrete to flow laterally more than 24 inches.

F. No concrete shall be placed for any element until reinforcing for same is fastened in place nor until forms are complete. No concrete shall be placed before work that is to be embedded has been set. Notify other crafts so they may deliver anchor, inserts, etc., or other work to be

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embedded in ample time and also notify them when their assistance in setting is required.

Reinforcing or other materials that have been set in place shall not be disturbed.

G. No pipes except electrical conduits 1-1/4" and less in diameter shall be embedded in structural concrete. Before placing concrete, such pipes and large conduits shall be sleeved providing 1/4" clearance (min.) all around. Sleeves for plumbing and mechanical pipes shall be placed so as not to impair strength of concrete or interfere with reinforcing bar placement. Multiple sleeve openings shall be placed no closer than three times diameter of the larger sleeve. Reinforcing clearances to sleeves shall conform to clearances specified for concrete surfaces. Sleeves and inserts will be provided and set under other Sections of the work.

H. Remove debris, mud and water from places to receive concrete.

I. Concrete splash and/or grout shall be removed from surfaces that will receive painter's finish.

J. Place no concrete in water unless written permission has been obtained from Structural Engineer.

K. Notify Owner's Representative, Architect and Structural Engineer 48 hours minimum prior to placing of any concrete.

3.3 VIBRATION AND CONSOLIDATION

A. Concrete shall be thoroughly consolidated by means of internal mechanical vibrators. Such consolidation shall be produced as will be obtained by placing the vibrator directly in concrete at 18" - 30" intervals for a period of approximately 5 to 15 seconds and withdrawing slowly or as directed, depending on the consistency of concrete. One vibrator will be required for each location where simultaneous placing takes place, to ensure thorough vibrating of all sections.

Provide sufficient spare vibrators on the job so as to have them readily available in case any vibrator in use should suddenly cease to function properly. Where spare vibrators are employed, provide additional spares. Provide smaller diameter vibrators for areas with congested reinforcing steel. Under no condition shall vibrator be placed against reinforcing steel or attached to forms.

Use no vibrators to transport material.

B. Vibrator shall be of the flexible immersion type having a frequency of not less than 8,000 rpm.

Use and type of vibrator shall conform to ACI 309, "Recommended Practice for Consolidation of Concrete".

C. Spading will not be permitted on exposed concrete surfaces.

D. Voids and rock pockets shall be eliminated. Voids and rock pockets in exposed concrete may subject that portion to rejection.

3.4 CONSTRUCTION JOINTS

A. Placement of construction joints and the manner in which they are provided for shall be only as approved by Contracting Officer or as shown on the Drawings. Construction joints shall be few as possible and will not be permitted simply to save forms. Submit shop drawings of construction joints showing proposed locations and details. Submit to Contracting Officer prior to forming or placing concrete.

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3.5 CURING

A. See Section 03 35 00, Paragraph 3.01.

3.6 EQUIPMENT BASES

A. Verify sizes and shapes required by items specified elsewhere. Concrete bases for special equipment shall be installed in strict accordance with Drawing details and the specifications and recommendations of the equipment manufacturer.

3.7 GROUTING

A. The setting of steel base plates is specified under Structural Steel Section. The grouting of the steel base plates shall be performed as hereinafter specified and as a part of this Section.

B. Grout used for the grouting of base plates shall be non-metallic, non-shrink grout mixed and applied in strict accordance with manufacturer's directions.

C. Grouting of bases shall be carefully done so as not to leave any voids between the base plates and the concrete.

3.8 CONCRETE SURFACE REPAIRS

A. Defective Concrete: Repair and patch defective areas when approved by Contracting Officer.

Remove and replace concrete that cannot be repaired and patched to Contracting Officer’s approval.

B. Patching Mortar: Mix dry-pack patching mortar, consisting of one part portland cement to two and one-half parts fine aggregate passing a No. 16 sieve, using only enough water for handling and placing.

C. Perform structural repairs of concrete, subject to Contracting Officer’s approval, using epoxy adhesive and patching mortar.

3.9 FIELD QUALITY CONTROL

A. Refer to Quality Control Section for general requirements governing testing and inspection.

B. Tests and inspections shall be performed by qualified individuals, engineering companies or testing laboratories who shall perform those special inspections required by Sec. 1704 of the International and California Building Codes, those tests and inspections specified below and other tests and inspections the Contracting Officer may require to establish the acceptability of the work.

C. Testing and inspection services shall be retained by the Contractor at his expense except that when tests or inspections reveal failure of materials to meet contract requirements, costs for subsequent tests and inspections will be deducted from the Contract Price. Excessive inspection time required

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by Contractor's failure to provide sufficient workmen or to properly pursue the progress of the work shall likewise be deducted from the Contract Price.

D. Furnish material and handling for test cylinders and any other samples which testing agency requires for analysis of concrete work.

E. Compression Tests; unless noted otherwise:

1. Mild Reinforced Concrete: 4 compression test cylinders will be taken for each placement of 150 cu. yd. or fraction thereof of each class of concrete placed each day. Make, cure and store test cylinders as per ASTM C 31. One cylinder will be tested at 7 days for information; two at 28 days for acceptance; and one retained as a spare.

F. Slump Test: Slump tests will be performed as per ASTM C 143 (slump cone) 360-63 at time of taking test cylinders. Tests shall be taken at the truck.

G. Testing agencies shall select and prepare samples taken at job site.

END OF SECTION 03 31 00