SECTION_03_30_10_Concrete_Placement.docx
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SECTION 03 30 10 CONCRETE PLACEMENT
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SECTION 03 30 10
SECTION 03 30 10
CONCRETE PLACEMENT
| PART 1 | GENERAL |
| 1.1 | SECTION INCLUDES |
| A. | Concrete placement for slabs on grade, slabs on fill, structural building frame, and other concrete components. |
| 1.2 | REFERENCES |
| A. | ACI 301: Specifications for Structural Concrete for Buildings. |
| B. | ACI 305: Hot Weather Concreting. |
| C. | ACI 306: Cold Weather Concreting. |
| D. | ACI 309: Standard Practice for Consolidation of Concrete. |
| E. | ASTM C 881: Standard Specification for Epoxy-Resin-Base Bonding Systems for Concrete. |
| F. | ASTM C 1059: Standard Specification for Latex Agents for Bonding Fresh to Hardened Concrete. |
1.3 SUBMITTALS
| A. | Batch Delivery Ticket: For each batch delivered to site, identify. |
| 1. | Date and Project description. |
| 2. | Producer and plant. |
| 3. | Name of contractor. |
| 4. | Serial number of ticket. |
| 5. | Mix identification. |
| 6. | Truck number and time dispatched. |
| 7. | Volume of concrete. |
| 8. | Type and amount of cement. |
| 9. | Total water and water/cement ratio. |
| 10. | Water added for receiver of concrete and receiver's initials. |
| 11. | Admixture types. |
| 12. | Separate weights of fine and coarse aggregate. |
| 13. | Statement of whether batch is pre-mixed at plant or mixed in transit. |
| B. | Record of Placed Concrete: Identify record date, location of pour, quantity, air temperature, and CONTRACTOR’s quality control test samples taken. |
| C. | Bonding Compound: Identify product name, type, and chemical analysis. |
| 1.4 | QUALITY ASSURANCE |
| A. | Provide ACI certified finishers. |
| B. | Remove and replace any placed concrete suffering hot or cold weather damage. |
| C. | For control testing follow Section 03 30 05 requirements. |
| 1.5 | ACCEPTANCE |
| A. | Concrete work that fails to meet any of the following requirements will be considered defective. Replace any Defective Work at no additional cost to the Governement. |
| 1. | Placement: |
| a. | Reinforcing steel size, quantity, strength, position, damage, orarrangement is not as specified or does not comply with code. |
| b. | Formwork differs from required dimensions or location in such a manner as to reduce concrete’s strength or load carrying capacity or physical esthetics. |
| c. | Workmanship likely to result in deficient strength. |
| 2. | Finishing: |
| a. | Concrete exposed to view has defects that adversely affect appearance. |
| b. | Slab tolerances of Section 03 35 00 are not met. |
| 3. | Protection: |
| a. | Method of curing is not as specified. |
| b. | Inadequate protection of concrete during early stages of hardening and strength development from |
| 1) | temperature extremes. |
| 2) | rapid moisture loss. |
| c. | Mechanical injury, construction fires, accidents, or premature removal of formwork likely to result in deficient strength development. |
| PART 2 | PRODUCTS |
| 2.1 | MATERIALS |
| A. | Concrete, Section 03 30 04. Class as indicated. |
| B. | Bonding compound, ASTM C 1059. Either polyvinyl acetate base or acrylic base latex. |
| 1. | Use type I in areas not subject to high humidity or immersion in water with minimum bond strength of 400 psi. |
| 2. | Use type II in areas subject to high humidity or immersion in water with minimumbond strength of 1250 psi. |
| C. | Vapor retarder, 10 mil thick clear polyethylene sheet. Type recommended for below grade application. |
| D. | Forms, Section 03 11 00. |
| E. | Reinforcement, Section 03 20 00. |
| F. | Coverings and curing compound, Section 03 39 00. |
| G. | Shinkage compensating grout, Section 03 61 00. |
| H. | Epoxy adhesive, Section 03 61 00. |
| PART 3 | EXECUTION |
| 3.1 | PREPARATION |
| A. | Notify COR minimum 24 hours prior to commencement of concrete placement operations. |
| B. | Do not allow construction loads to exceed structural capacity. |
| C. | Clean previously placed concrete. Apply bonding compound per manufacturer's instructions. |
| D. | At locations where new concrete is dowelled to existing work, drill, remove dust, insert and pack steel dowels with shrink compensating grout. |
| 3.2 | EXAMINATION |
| A. | Verify items to be cast into concrete are accurately placed and held securely. |
| B. | Verify slump, air content range, mix identity, and batch time on delivery ticket matches mix design. |
| C. | Verify slab steel mats are supported by steel chairs, precast concrete blocks, or other slab bolsters. Do not pour if absent. |
| 3.3 | DELIVERY |
| A. | Slump and Air Content: Keep slump and air content within the allowable range. |
| B. | Placement Time: |
| Air Temperature |
| Time After Initial Batching |
| Less than 90 deg. F. |
| 1–1/2 hours |
| Greater than 90 deg. F. |
| 1–hour (without retarder) |
| Greater than 90 deg. F. |
| 1–1/2 hours (with retarder) |
To increase time past 1-1/2 hours, a hydration stabilizer that is acceptable to Supplier may be used.
| C. | Tempering: |
| 1. | Water may be added if all following conditions are met. |
| a. | The mix design water/cement ratio is not exceeded. |
| b. | The delivery ticket allows for addition of water based upon water/cement ratio. |
| c. | The amount of water added is accurately measured to within 1 gallon of the design addition. |
| d. | Water addition is followed by 3 minutes of mixing at mixing speed prior to discharge. |
| e. | Supplier and Contractor mutually agree on who is authorized to add water. |
| 2. | Do not add water after 1 cubic yard of concrete has discharged from the delivery vehicle. |
| D. | Super-plasticizer: Comply with manufacturer's requirements. If none, then as follows. |
| 1. | If added at site, add agent using injection equipment capable of rapidly and uniformly distributing the admixture to the concrete. Prior to discharge, mix for a minimum of 5 minutes at a drum rate not less than 12 rpm or more than 15 rpm. |
| 2. | If added at plant; do not deliver to site unless batch delivery ticket displays water/cement ratio prior to super-plasticizer addition. |
| 3.4 | CONCRETE PLACEMENT |
| A. | Place concrete, ACI 301. |
| 1. | Hot Weather Placement: ACI 305. If the rate of evaporation approaches 0.2 lb./ft2/hr. precautions against plastic shrinkage cracking are necessary. (i.e. dampening Subgrade and forms; placing concrete at the lowest possible temperature; erecting windbreaks and sunshades; fog sprays; use of evaporation retardants; or rescheduling time of placement). |
| 2. | Cold Weather Placement: ACI 306. Non-chloride accelerating admixture may be used in concrete work placed at ambient temperatures below 50 deg. F. Use of admixtures will not relax cold weather placement, curing, or protection requirements. |
| B. | Concrete Temperature: Keep mixed concrete temperature at time of placement between 60 deg. F. and 90 deg. F. |
| C. | Do not disturb reinforcement, inserts, embedded parts, and formed joints. |
| D. | Do not break or interrupt successive pours such that cold joints occur. |
| E. | Honeycomb or embedded debris in concrete is not acceptable. |
| 3.5 | JOINTS AND JOINT SEALING |
| A. | Steel edging and jointing tools are acceptable. Preferred are magnesium, aluminum or wood tools |
| B. | Pavement joint sealing, Section 32 13 73. |
| 3.6 | CONSOLIDATION |
| A. | Keep spare vibrator available during concrete placement operations, ACI 309. |
| 3.7 | FINISHING |
| A. | Section 03 35 00 and as follows. |
Table 1: Finishes
| Type of work |
| Type of finish |
| Sidewalks, garage floors, ramps, exterior concrete Pavement |
| Broom or belt finish |
| Exterior platforms, steps, and landings, exterior and interior pedestrian ramps, not covered by other finish materials |
| Non-slip finish |
| Surfaces intended to receive bonded applied cementitious applications |
| Scratched finish |
| Surfaces intended to receive roofing, except future floors, waterproofing membranes, and roof surfaces that are future floors or sand bed terrazzo |
| Floated finish |
| Floors and roof surfaces that are floors intended as walking surfaces or to receive floor coverings |
| Troweled |
| Unpainted concrete surfaces not exposed to public view |
| Rough as-cast form finish |
| Unpainted concrete surfaces exposed to public view |
| Smooth as-cast form finish |
| Concrete surfaces to receive paint or plaster |
| Grout cleaned finish |
| 3.8 | CURING |
| A. | Section 03 39 00. Use a membrane forming compound unless specified otherwise. |
| 3.9 | PROTECTION AND REPAIR |
| A. | Protection: Section 01 66 00. |
| 1. | Immediately after placement, protect concrete from premature drying, excessively hot or cold temperatures, graffiti, and mechanical injury. |
| 2. | Maintain concrete with minimal moisture loss at relatively constant temperature for period necessary for hydration of cement and hardening of concrete. |
| B. | Repair: |
| 1. | Modify or replace concrete not conforming to required levels, lines, details, and elevations. |
| 2. | Structural analysis and additional testing may be required at no additional cost to OWNER when the strength of a structure is considered potentially deficient. |
| 3. | To patch imperfections refer to Section 03 35 00 requirements. |
| 4. | Remove graffiti and mechanical injury. |
END OF SECTION
CONCRETE PLACEMENT Page 6
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