39-Sec 03 30 00 - Cast In Place Concrete.pdf
PDF 76 KB Posted
- Attached to
- 2201256.01 - Whistlestop Park
- Solicitation number
- US.160528
- Issued by
- Montgomery County, Pennsylvania
About this file
This is a technical specification document for cast-in-place concrete work prepared for Montgomery Township, Pennsylvania's Whistlestop Park project (Contract 2022-01256.01). The specification establishes comprehensive requirements for concrete materials, placement, finishing, and quality control in accordance with ACI standards and PennDOT Publication 408. The work includes cast-in-place concrete, control and expansion joint devices with associated sealants, formwork, reinforcement, and concrete finishing. Concrete must meet specified requirements including 3,500 psi compressive strength at 28 days, a maximum water-cement ratio of 0.47, 6 percent air entrainment (plus or minus 1 percent), and a 4-inch slump (plus or minus 1 inch). The contractor must notify the Engineer a minimum of 48 hours prior to concrete placement operations and must saw cut joints within 24 hours after placement using a 3/16-inch thick blade cut to 1/4 depth of slab thickness. Floor surfaces must maintain maximum flatness of 1/4 inch in 10 feet. Concrete must be cured for a minimum of 7 days in accordance with ACI 308 standards, with water curing required for all bridge deck placements.
Quality control requirements mandate that the contractor submit proposed concrete mix designs for approval prior to work commencement and provide free access for inspection and testing. A minimum of six 6"x12" or nine 4"x8" concrete test cylinders must be prepared and cured per ASTM C31 for every 50 cubic yards or less of each concrete class placed, tested at 7 days, 28 days, and reserved for additional testing. Concrete materials must be sourced from PennDOT-certified suppliers using ASTM C150 Portland cement (Type I or Type III), ASTM C33 aggregates, and approved admixtures. All materials must be obtained from the same cement and aggregate source for consistency. If test cylinders fail strength requirements, the Owner may require core testing per ASTM C42 at the contractor's expense. The specification prohibits patching or repair of exposed concrete except upon express written direction from the Engineer for each individual area.
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Text version
CAST-IN PLACE CONCRETE
03 30 00-1
SECTION 03 30 00
CAST-IN-PLACE CONCRETE
PART 1 – GENERAL
1.01 SECTION INCLUDES
A. Cast-in-place concrete.
B. Control, expansion and contraction joint devices associated with concrete work, including joint sealants.
1.02 RELATED SECTIONS
A. Related Work Specified Elsewhere:
1. Section 03 11 00: Concrete Formwork
2. Section 03 20 00: Concrete Reinforcement
1.03 REFERENCES
A. ACI 301: Specifications for Structural Concrete.
B. ACI 302: Guide for Concrete Floor and Slab Construction.
C. ACI 304: Recommended Practice for Measuring, Mixing, Transporting and Placing Concrete.
D. ACI 305R: Hot Weather Concreting.
E. ACI 306R: Cold Weather Concreting.
F. ACI 308: Standard Practice for Curing Concrete.
G. ASTM C31: Practices for Making and Curing Concrete Test Specimens in the Field.
H. ASTM C33: Concrete Aggregates.
I. ASTM C39: Test Method for Compressive Strength of Cylindrical Concrete Specimens.
J. ASTM C42: Methods of Obtaining and Testing Drilled Cores and Sawed Beams of Concrete.
K. ASTM C94: Ready-Mixed Concrete.
L. ASTM C150: Portland Cement.
M. ASTM C172: Method of Sampling Fresh Mixed Concrete.
N. ASTM C260: Air Entraining Admixtures for Concrete.
O. ASTM C494:Chemical Admixtures for Concrete.
P. ASTM C618: Fly Ash and Raw or Calcinated Natural Pozzolan for Use as a Mineral Admixture in Portland Cement Concrete.
Q. ASTM D1751: Preformed Expansion Joint Fillers for Concrete Paving and Structural Construction (Non-extruding and Resilient Bituminous Types).
R. Commonwealth of Pennsylvania, Department of Transportation, Publication 408 Specifications, including any interim updates through the Project Let Date
03 30 00-2
1.04 SUBMITTALS FOR REVIEW
A. Section 01 33 00 – Submittals: Procedures for Submittals.
B. Product Data: Provide data on joint devices, attachment accessories, admixtures and concrete mix designs, test batch compressive strength results and statistical analysis.
1.05 SUBMITTALS AT PROJECT CLOSEOUT
A. Section 01 70 00 – Contract Closeout: Project Record Drawings.
B. Accurately record actual locations of embedded utilities and components which are concealed from view.
1.06 QUALITY ASSSURANCE
A. Perform Work in accordance with ACI 301 and PennDOT Publication 408.
B. Maintain one copy of each document on-site.
C. Acquire cement and aggregate from same source for all Work.
D. Conform to ACI 305R when concreting during hot weather.
E. Conform to ACI 306R when concreting during cold weather.
PART 2 – PRODUCTS
2.01 CONCRETE MATERIALS
A. Cement: ASTM C150, Type I – Normal or Type III – High Early Strength, Portland type.
B. Fine and Coarse Aggregates: ASTM C33.
C. Water: Clean and not detrimental to concrete.
D. PennDOT – Certified Class “A”, “AA” and “AAA” Cement Concrete (batched and supplied by a registered and approved PennDOT supplier listed in Bulletin 15 and Bulletin 42.
2.02 ADMIXTURES
A. Air Entrainment: ASTM C260.
B. Chemical: ASTM C494 – Type A – Water Reducing, Type C – Accelerating, Type E – Water
Reducing and Accelerating.
C. Fly Ash: ASTM C618.
2.03 ACCESSORIES
A. Non-Shrink Grout: Premixed compound consisting of non-metallic non-staining, aggregate, cement, water reducing and plasticizing agents; capable of developing minimum compressive strength of 2,400 psi in 48 hours and 7,000 psi in 28 days.
2.04 JOINT DEVICES AND FILLER MATERIALS
03 30 00-3
A. Joint Filler Type A: ASTM D1751; Asphalt impregnated fiberboard or felt, 1/4 inch thick;
tongue and groove profile.
2.05 CONCRETE MIX
A. Mix concrete in accordance with ACI 304. Deliver concrete in accordance with ASTM C94.
B. Select proportions for normal weight concrete in accordance with ACI 301 Method 1.
C. Provide concrete meeting the following criteria:
Unit Measurement
Compressive Strength (28 day minimum) 3,500 psi Water/Cement Ratio (maximum) 0.47 by weight (mass) Aggregate Size (maximum) 1-1/2 inch Air Entrained plus or minus 1% 6 percent Slump-Plus or Minus 1 inch 4 inches
D. Use accelerating admixtures in cold weather only when approved by Engineer. Use of admixtures will not relax cold weather placement requirements.
E. Use calcium chloride only when approved by Engineer.
F. Use set retarding admixtures during hot weather only when approved by Engineer.
G. All concrete is to be air entrained to 6% +/- 1%.
PART 3 – EXECUTION
3.01 EXAMINATION
A. Verify site conditions.
B. Verify requirements for concrete cover over reinforcement.
C. Verify that anchors, seats, plates, reinforcement and other items to be cast into concrete are accurately placed, positioned securely, and will not cause hardship in placing concrete.
3.02 PREPARATION
A. Prepare previously placed concrete by cleaning with steel brush and applying bonding agent in accordance with manufacturer’s instructions.
B. In locations where new concrete is doweled to existing work, drill holes in existing concrete, insert steel dowels and pack solid with non-shrink grout.
C. Coordinate the placement of joint devices with erection of concrete formwork and placement of form accessories.
3.03 PLACING CONCRETE
A. Place concrete in accordance with ACI 304 and PennDOT Publication 408.
B. Notify Engineer minimum 48 hours prior to commencement of operations.
03 30 00-4
C. Ensure reinforcement, inserts, embedded parts, formed expansion and contraction joints are not disturbed during concrete placement.
D. Place floor slabs in checkerboard or saw cut pattern indicated.
E. Saw cut joints within 24 hours after placing. Use 3/16 inch thick blade, cut into 1/4 depth of slab thickness.
F. Screed floors and slabs on grade level, maintaining surface flatness of maximum 1/4 inch in
10 ft.
3.04 CONCRETE FINISHING
A. Provide formed concrete walls with smooth rubbed finish.
B. Finish concrete floor surfaces in accordance with ACI 301 and PennDOT Publication 408.
C. Steel trowel surfaces which are scheduled to be exposed.
D. In areas with floor drains, maintain floor elevation at walls; pitch surfaces uniformly to drains as indicated on drawings.
3.05 CURING AND PROTECTION
A. Immediately after placement, protect concrete from premature drying, excessively hot or cold temperatures, and mechanical injury.
B. Maintain concrete with minimal moisture loss at relatively constant temperature for period necessary for hydration of cement and hardening of concrete.
C. Cure floor surfaces in accordance with ACI 308 and PennDOT Publication 408.
D. Water cure all concrete bridge Deck Placements in accordance with Publication 408 Section
1001.3(P)3.b. Cure for a minimum of 7 days, unless directed otherwise by Engineer, or in accordance with Manufacturer Specifications if approved by the Engineer.
3.06 FIELD QUALITY CONTROL
A. Section 01 40 00 – Quality Control Field inspection, testing
B. Provide free access to Work and cooperate with appointed firm.
C. Submit proposed mix design of each class of concrete to Engineer and inspection and testing firm for review prior to commencement of Work.
3.07 FIELD TESTS OF CONCRETE DURING CONSTRUCTION [BY OWNER]
A. Sample concrete in accordance with ASTM C172. One test for slump, air entrainment and air and concrete temperature will be taken from each set of test cylinders taken.
B. A minimum of six (6) – 6”x12” or nine (9) – 4”x8” concrete test cylinders will be prepared and cured in accordance with ASTM C31 for every 50 or less cubic yards of each class of concrete placed.
C. Cylinders shall be tested in accordance with ASTM C39 at the following schedule:
2 @ 7 days, 2 @ 28 days and 2 held in reserve for 6”x12” cylinders and 3 @ 7 days, 3 @ 28 days and 3 held in reserve for 4”x8” cylinders.
03 30 00-5
D. A minimum of one (1) additional set of test cylinders will be taken during cold weather or hot weather concreting or if high-early strength concrete is used, and be cured on job site under same conditions as concrete it represents.
E. If test cylinders fail to meet strength requirements, the Owner or Engineer may require core tests in accordance with ASTM C42 at the expense of Contractor.
F. Tests of cement and aggregates may be performed to ensure conformance with specified requirements.
3.08 PATCHING
A. Allow Engineer to inspect concrete surfaces immediately upon removal of forms.
B. Excessive honeycomb or embedded debris in concrete is not acceptable. Notify Engineer upon discovery.
C. Patch imperfections in accordance with ACI 301.
D. Remove or break off form ties for walls and seal openings with non-shrink grout providing a smooth finish.
3.09 DEFECTIVE CONCRETE
A. Defective Concrete: Concrete not conforming to required lines, details, dimensions, tolerances or specified requirements.
B. Repair or replacement of defective concrete will be determined by the Engineer.
C. Do not patch, fill, touch-up, repair, or replace exposed concrete except upon express direction of Engineer for each individual area.
END OF SECTION
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