\* \* \* \* \* \* \* \* \* \*

READ AND **REMOVE THIS PAGE** BEFORE PLACING

THE SPECIFICATION SECTION IN THE CONTRACT

\* \* \* \* \* \* \* \* \* \*

[DIVISION 3: CONCRETE]{.underline}

SECTION 03310 ‑ STRUCTURAL CONCRETE

USE: Furnishing and placing concrete, reinforcing steel, and framework
for construction projects. It is limited to grades 40 or 60 reinforcing
bars, and type A or B concrete, 27 600 kPa or 20 700 kPa respectively
(4,000 psi or 3,000 psi respectively). This section is a complete
concrete section in itself and is not intended to be used with other
\"Concrete\" sections.

**NOTES TO SPECIFIER:**

A. Options within paragraphs are identified by enclosure in brackets;
blank spaces enclosed by brackets \[[ ]{.underline}\] provide for
information to be inserted, as appropriate to individual projects.

B. **TO AVOID CONFLICTING REQUIREMENTS AND COSTLY MISTAKES,** the
specifier must edit (delete, substitute or add to the text). The
remaining paragraphs must be renumbered.

C. DELETE FOR FINAL COPY: Notes to the Specifier, located between lines
of asterisks; all \[brackets\], [underlining]{.underline}, **boldface,
**and *italics* within the paragraphs; and this page. (Open Reveal Codes
\[alt F3\] to do this accurately).

D. [To Edit "(Footer B)":]{.underline} (Corel 8). **ENTIRE FOOTER SHOULD
BE BOLDED. **Click in the footer and delete the "Project Name (ftr B)"
text and replace it with the **Name Of The Project (upper/lower case).**
Replace date with current MM/YY (WITHOUT BRACKETS).

E. The Guide Specifications are intended to be continuously reviewed and
revised. User's technical comments are appreciated. Also, other related
or similar specifications that are written "from scratch" that could
benefit others, or other questions can be sent to NSTC A/E Group, ST-110
or call (303) 987-6851.

F. DESIGN NOTES:

1\. **DRAWING DATA REQUIRED:**

A. Indicate rebar size, placement, and spacing within the concrete on
the drawings.

B. Indicate concrete outlines and dimensions on the drawings.

**REVISIONS OF THIS SECTION:**

CSI format, editorial changes 9/99

Metric: 10/99

Technical Update: 12/99

**SECTION 03310**

**STRUCTURAL CONCRETE**

**[PART 1: GENERAL]{.underline}**

**1.1 SUMMARY**

**A. Section Includes: Furnishing and placing cast-in-place concrete,
including reinforcing steel, formwork, \[waterstops,\] \[and\] \[gravel
subbase\]. **

**B. Related Sections**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**LIST ITEMS OF WORK THAT MIGHT LOGICALLY BE FURNISHED AND INSTALLED
UNDER THIS SECTION, BUT INSTEAD ARE SPECIFIED IN ANOTHER SECTION. THIS
ARTICLE IS RARELY REQUIRED.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**1.2 SUBMITTALS**

**A. Requirements: Submittals shall be according to \[Section 01009 ‑
General Information and Requirements.\] \[Section 01330 ‑ Submittal
Procedures.\] \[and\] \[Section 01331 ‑ Certificates.\]**

**B. Manufacturer\'s Literature: Submit for approval five copies of the
manufacturer\'s descriptive data for the admixtures to be used on this
project. Include the brand name, description, mix of concrete,
(including other admixture), purpose for which used and location in
which this concrete shall be placed.**

**C. Shop Drawings: Submit for approval five copies of shop drawings for
the reinforcement to be used on this project. Shop drawings shall show
the lengths, bends, and splices. **

**D. Mix Design: Submit for approval five copies of the design mix and
strength test results for each strength, class and type of concrete to
be used on this project using material the Contractor proposes to use on
the project. Mix designs and strength test results shall be prepared by
a certified testing laboratory.**

**E. Mill Test Reports: Submit three copies for each shipment of
Portland cement and reinforcement to be used on this project.**

**F. Certificates of Conformance: Submit three copies of the batch
certificates for each load of ready‑mix delivered to the jobsite,
certifying that the batch conforms to the requirements of this
specification.**

**1.4 QUALITY ASSURANCE**

**A. Causes for Rejection: Concrete may be rejected for, but not limited
to, the following reasons:**

**1. Inadequate strength after 28 calendar days as indicated by test
cylinders. The Contractor shall be responsible for further testing
required by the Government to determine the strength of the concrete.**

**2. Freezing within first 3 calendar days of placement.**

**3. Segregation of aggregate or over‑vibration resulting in excessive
water in the surface of the concrete or lack of water in vertical
surfaces.**

**4. Honeycomb over 25 percent of the surface.**

**5. Voids larger than 2-inches (50 mm) across.**

**6. Exposed reinforcing steel.**

**7. Misalignment of concrete.**

**8. Substandard aggregate in the mix.**

**9. Failure to cover or seal concrete during initial 7‑day curing
period.**

**10. Improper placement of cut-offs, blockouts, anchor bolts, or other
imbedded items.**

**11. Irregular, cracked, crazed, or spalled concrete surfaces.**

**12. Stained or discolored surfaces.**

**[PART 2: PRODUCTS]{.underline}**

**2.1 MATERIALS**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**SELECT TYPE OF CEMENT USED; INDICATE LOCATIONS OF BOTH TYPES ON
DRAWINGS WHEN MORE THAN ONE TYPE IS USED. AVAILABLE CEMENT TYPES ARE:**

**Type I normal**

**Type IA normal, air entraining**

**Type II moderate sulfate resistance**

**Type IIA moderate sulfate resistance, air-entraining**

**Type III high early strength**

**Type IIIA high early strength, air entraining**

**Type IV low heat of hydration**

**Type V high sulfate resistance**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**A. Cement: ASTM C 150, portland cement, Type \[[ ]{.underline}\]. The
use of caked or hardened cement will not be permitted.**

**B. Water: AASHTO T 26. Water shall be clean and free from harmful
amounts of acids, alkalis, and organic materials. Potable water is
acceptable without testing.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**VERIFY THAT LARGEST AGGREGATE SIZE WILL EASILY FIT BETWEEN REINFORCING
AND ALLOW SMALLER AGGREGATE AND CEMENT PASTE TO CONSOLIDATE BETWEEN
REBAR WITHOUT CAUSING WEDGING. IF THE STATE DOT MIX IS READILY AVAILABLE
AND WILL MEET THE REQUIREMENTS, MODIFY THE BELOW GRADATION REQUIREMENTS
ACCORDINGLY TO REDUCE POSSIBLE COST OF A SPECIAL MIX DESIGN.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**C. Aggregates**

**1. Course: ASTM C 33, hard, durable, uncoated \[crushed\] stone or
gravel. Course aggregate for concrete having an exterior surface
exposed, except floor slabs shall meet the following gradation:**

**95 to 100 percent shall pass a 1‑1/2 inch (37.5 mm) sieve;**

**35 to 79 percent shall pass a 3/4-inch (19 mm) sieve;**

**10 to 30 percent shall pass a 3/8-inch (9.5 mm) sieve and not over 5
percent shall pass a No. 4 sieve. Percentages are by weight.**

**2. Fine: ASTM C 33 clean, hard, durable, uncoated sand grains, free
from silt, loam and clay \[with a fineness modulus of not less than 2.5
nor more than 3.0.\] and shall meet the following gradation:**

**95 to 100 percent by weight passing No. 4 sieve;**

**45 to 70 percent passing No. 16 sieve;**

**15 to 30 percent passing No. 50 sieve;**

** 3 to 8 percent passing No. 100 sieve.**

**3. For cement topping finish, use(\[[ ]{.underline}\]-inch (\[[
]{.underline}\]-mm) minimum and \[[ ]{.underline}\]-inch (\[[
]{.underline}\]-mm) maximum size aggregate.**

**4. The maximum size aggregate in floor slabs shall be \[3/4\] inch
(\[20\] mm).**

**D. Reinforcing Steel: Shall have a yield point of \[60\] \[40\] KSI
(\[414\] \[276\] MPa) and shall be ASTM A 615, grade \[60\] \[40\].**

**E. Welded Wire Fabric: ASTM A 185, electrically cold‑drawn wire of the
gauge and mesh size shown on the drawings. **

**F. Reinforcement Supports: Shall be of the size and type required.**

**G. Isolation Joint Material: ASTM D 994. Preformed filler strips shall
be the full width and depth of slab or joint. Unless otherwise
indicated, the material shall be l/2-inch (13 mm) thick. Joint Sealer:
ASTM D 1190.**

**H. Adhesive for Sealing Joints: Mastic‑type.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**CLASS A CURING COMPOUND IS WAX BASED. TYPE I IS CLEAR OR TRANSLUCENT
WITHOUT DYE; TYPE 1-D IS CLEAR OR TRANSLUCENT WITH FUGITIVE DYE; TYPE B
IS WHITE PIGMENTED.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**I. Membrane Curing Compound: ASTM C 309, Type \[1\]\[1D\] Class
\[A\]\[B\], \[chlorinated rubber‑based\], \[100 percent resin‑based\].
**

**J. Moist Curing Material **

** 1. Mats: ASTM C 171.**

**2. Burlap: AASHTO M 182. **

**3. Sand: ASTM C 144.**

**K. Impervious Sheet Covering: Shall be one of the following: **

**1. Polyethylene sheeting shall be 4‑mil (0.1 mm) minimum thickness,
black.**

**2. Polyethylene‑coated kraftpaper.**

**3. Waterproof paper: ASTM C 171.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**INDICATE ON THE DRAWINGS THE AREAS REQUIRING DUST PREVENTIVE
ADMIXTURES. INDICATE THE TYPE AND QUANTITY OF ADMIXTURE REQUIRED.**

**INDICATE ON THE DRAWINGS THE AREAS REQUIRING SURFACE HARDENER OR
SEALERS. INDICATE THE TYPE OF HARDENER REQUIRED.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**L. Admixtures: Other than specified herein, or by reference,
admixtures may be used only when approved in writing by the Contracting
Officer. When used, comply with the manufacturer\'s written
instructions.**

**1. Air content by volume: ACI 211.1, paragraph 6.3.3, plus or minus 1
percent. Air entrainment additives: ASTM C 260.**

**2. Calcium chloride shall be used when specified or approved by the
Contracting Officer. Do not use near galvanized materials.**

**3. Water reducing or retarding chemical admixtures: ASTM C 494. Used
only when specified in the mix design or approved by the Contracting
Officer.**

**4. Pozzolanic or fly‑ash admixtures: ASTM C 618 and ASTM C 311.**

**5. Dust preventative agents: Fluorosilicate solutions, 2 pounds (1 kg)
) of magnesium fluorosilicate per 1 gallon (4 liters) of water, or 2
pounds (1 kg) of zinc fluorosilicate-crystalline salts per 1 gallon (4
liters) of water, shall be used when approved in writing by the
Contracting Officer.**

**6. Surface hardener: Natural aggregate or iron‑bearing dry‑shake
material for concrete surface improving and hardening, manufactured for
this purpose, containing quartz, trap‑rock, emery, or granite, and
approved in writing by the Contracting Officer.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**INDICATE ON THE DRAWINGS THE AREAS REQUIRING VAPOR BARRIER. **

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**M. Vapor Barriers: Polyethylene sheeting, 6 mil (1.5 mm) thickness.**

**N. Control Joints: Nonstaining wood, plastic, or metal formed to be
removed without spalling concrete.**

**O. Waterstops: \[ASTM D 570, D 624, D 638, D 746, D 747, D 792, D
1149, D 1203, and D 2240\] \[polyvinyl chloride (PVC)\] \[ASTM D 2628,
rubber of the type shown on the drawings\].**

**P. Epoxy Bonding Material: ACI 503.1 for hardened concrete or ACI
503.2 for plastic concrete.**

**Q. Forming Material**

**1. Formwork for exposed concrete surfaces shall be plywood,
metal‑framed plywood‑faced, or other panel-type materials to provide
continuous, straight, smooth, as‑cast surfaces. Furnish formwork in
largest practicable lengths to minimize the number of joints. Form
material shall be of sufficient stiffness to withstand pressure of newly
placed concrete without bowing or deflection. Plywood shall conform to
the requirements of PS 1.**

**2. Concrete surfaces which will be unexposed in the finished structure
may be formed with plywood, lumber, metal, or other materials acceptable
to the Contracting Officer. Provide lumber that is dressed on at least
two edges and one side for tight fit.**

**R. Anchor Bolts and Embedded Steel: Section 05120 - Structural
Steel.**

**2.2 MIXES**

**A. Concrete Design Mix: Design the mix to provide concrete, including
specified admixtures and cement, with the following properties using
material the Contractor proposes to use on the project:**

**1. Type A Concrete shall be \[27 600\] kPa (\[4,000\] psi), 28‑day
compressive strength. The water‑cement ratio shall not exceed 5 gallons
(19 liters) per sack of cement, inclusive of water in the aggregate. The
proportions of aggregate to cement shall produce concrete with a slump
of 2 to 4 inches (5 to 10 mm) according to ASTM C 143.**

** 2. Type B Concrete shall be \[20 700\] kPa (\[3,000\] psi), 28‑day
compressive strength. The water‑cement ratio shall not exceed 6 gallons
(23 liters) per sack of cement, inclusive of water in the aggregate. The
proportions of aggregate to cement shall produce concrete with a slump
of 2 to 4 inches (50 to 100 mm) according to ASTM C 143.**

**3. Air content shall be 4 to 6 percent at the point of placement .**

**4. Ready‑mixed concrete that meets the above specifications will be
permitted when approved in writing by the Contracting Officer. The
Contracting Officer will have access to the mixing plant during concrete
mixing operations.**

**2.3 SOURCE QUALITY CONTROL**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**DETERMINE WHETHER THE GOVERNMENT OR THE CONTRACTOR IS GOING TO PERFORM
THE REQUIRED TESTING AND EDIT ACCORDINGLY. INDICATE HOW MANY CYLINDER
TESTS WILL BE REQUIRED OF THE DESIGN MIX.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**A. Testing: \[The Government will perform the required air content
tests, compression tests of 3 cylinders and slump tests to substantiate
mix designs. Results will be recorded and distributed.\] \[The
Government will make arrangements for a certified, independent testing
laboratory to perform the air content, compression tests of \[3\]
cylinders and slump tests to substantiate mix designs. Results will be
recorded and distributed.\] \[Perform the air content tests, compression
tests of \[3\] cylinders, and slump tests to substantiate mix designs.\]
\[Furnish necessary equipment, labor, and materials to conduct the
testing.\] \[Testing shall be conducted in the presence of the
Contracting Officer who shall be given 48-hours notice before any test
is to be conducted.\] \[Make arrangements for a certified, independent
testing laboratory, according to the requirements of Section 01458 -
Testing Laboratory Services, to perform the air content tests,
compression tests of \[3\] cylinders, and slump tests to substantiate
mix designs. Record and distribute the results.\]**

**[PART 3: EXECUTION]{.underline}**

**3.1 PREPARATION**

**A. Clearing and Grubbing: Section 02231 - Clearing and Grubbing.**

**B. Aggregate Subbase: Shall be placed under the slab, as shown on the
drawings, prior to erecting formwork, according to Section 02322 ‑
Excavation and Fill for Structures.**

**C. Form Construction: ACI 347, Chapters 1 through 4. Construct to the
exact sizes, shapes, lines, and dimensions shown, and as required to
obtain accurate alignment, location, grades, level, and plumb work in
finished structures. Provide required detail work, construction aids,
and embedded items. Use selected materials to obtain required finishes.
Fabricate forms for removal without hammering or prying against concrete
surfaces. Provide crush plates or wrecking plates if stripping may
damage cast-concrete surfaces. Provide kerfed-wood inserts for forming
keyways, reglets, and recesses to prevent swelling and assure ease of
removal. Form oil may be applied to facilitate removal of the forms.**

**D. Form Inspection: Notify the Contracting Officer 24 hours in advance
of concrete placement to allow for inspection of the formwork and
placement of items to be placed in the concrete. Excess water shall be
removed from the forms before concrete placement.**

**E. Bonding to Existing Material: Surfaces required to be bonded to the
concrete shall be prepared for bonding adhesive according to the
manufacturer\'s instructions.**

**F. Construction Joints: Shall be made with beveled keyways at
locations as approved by the Contracting Officer \[or as indicated on
the drawings\]. Reinforcing steel shall be continuous through joints.**

**G. Reinforcing Steel: Shall be held securely in position by steel wire
or metal chairs during the placement of concrete. Reinforcing steel
shall be clean of dirt, grease, and rust prior to placement of
concrete.**

**H. Waterstops: Shall be carefully placed and supported at the
locations shown on the drawings. Splices shall be avoided to the maximum
extent possible, and splices shall be made in accordance with the
manufacturer\'s written instructions. Take precautions so that
waterstops are not displaced or damaged by construction operations. Keep
waterstop surfaces free of oil, grease, dried mortar, or other foreign
matter while the waterstops are being embedded in concrete; portions of
the waterstops designed for embedment in concrete shall be tightly
enclosed in dense concrete.**

**I. Vapor Barrier: Shall be installed as shown on the drawings; lap
seams 6-inches (150 mm).**

**J. Anchor Bolts and Embedded Steel: Shall be placed with a template.**

**K. Concrete Mixing: ACI 304.**

**1. Mix materials for concrete in a drum‑type batch machine mixer. For
mixers of 1 cubic yard (meter) or smaller capacity, mix concrete for a
minimum of 1‑1/2 minutes but not more than 5 minutes after ingredients
are in the mixer before the batch is released. For mixers with a
capacity larger than 1 cubic yard (meter) increase the minimum mixing
time by 15 seconds for each additional cubic yard (meter) or portion
thereof.**

**2. When using ready‑mixed concrete, comply with the requirements of
ASTM C 94 and as herein specified. During hot weather or under
conditions contributing to rapid setting of concrete, a shorter mixing
time than is specified in ASTM C 94 may be required. When air
temperature is between 85 and 90 degrees F, reduce the mixing and
delivery time from 90 to 75 minutes. When air temperature is above 90
degrees F, reduce the mixing and delivery time to 60 min.**

**L. Admixtures that have been approved in writing by the Contracting
Officer may be used to aid in setting times when pouring during hot or
cold weather conditions.**

**3.2 CONCRETE PLACEMENT**

**A. Placement and Consolidation**

**1. When concrete cannot be placed within the time frame specified
above, do not place it, but remove it from the jobsite.**

**2. Concrete shall be placed only in the presence of the Contracting
Officer who shall be notified 24 hours in advance of each intended
concrete placement. Concrete shall be placed in maximum lifts of \[18\]
inches (\[450\] mm), and shall be well-vibrated, rodded, or spaded into
place to fill voids and angles to ensure smooth surfaces and dense
concrete. Concrete shall be deposited at its final position, and shall
not be allowed to flow in a manner that will cause segregation of the
materials. Concrete must not be dropped more than \[5\] feet (\[1500\]
mm) vertically without use of a tremie or similar device.**

**B. Bonding to Existing Concrete: When a bond is desired between fresh
concrete and concrete which has set, the surface of the concrete already
in place shall be thoroughly cleaned of loose material, laitance, dirt,
and other foreign material, and the old concrete shall be soaked with
water. When no bond is desired between the old concrete and the new, the
surface of the old concrete that will come in contact with the fresh
concrete shall be painted with an asphaltum or other suitable material
to prevent bonding.**

**C. Hot Weather Concreting: ACI 305R.**

**D. Cold Weather Concreting: ACI 306R. Materials needed for protection
shall be on the jobsite before concrete work is started. Do not place
concrete on a frozen subgrade or against surfaces having deposits of
frost, snow, or ice.**

**3.3 CONCRETE FINISHING**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**INDICATE THE TYPE OF FINISH REQUIRED HERE OR ON THE DRAWINGS.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**A. Concrete Surface Finishes**

**1. The top surface of walls and interior slabs shall be given a
\[wood-float\] finish after screeding. \[Concrete shall be finished as
indicated on the drawings.\]**

**2. Finish exterior slabs with a broomed finish unless otherwise
indicated on the drawings. After floating and troweling and after the
water sheen has disappeared, brush lightly with an approved steel,
fiber, or horsehair broom not less than 450 mm (18 inches) wide. Brush
to form a uniform roughened surface at right angles to the centerline.
Edge joints and panel edges with a metal tool to leave a smooth border
around each panel.**

**3. Apply a sealer and hardener to the floor according to the
manufacturer\'s instructions. **

**4. Finish interior slabs according to ACI 301, paragraph 11.7.3. The
finished floor surface shall have a smooth architectural-type finish
with no irregularities, cracking, crazing, or spalling.**

**B. Form Removal: Formwork not supporting concrete, may be removed
after curing at not less than 50 degrees F for 24 hours after placing
concrete, and when curing and protection procedures are followed as
specified. The concrete shall be sufficiently hard so as not to be
damaged by form removal. Formwork and false work supporting live or dead
loads of concrete (such as slabs and other structural elements) shall
not be removed for a minimum of 14 days, and after the 14 days, not
until concrete has attained the design minimum 28-day compressive
strength as indicated by test cylinders.**

**C. Concrete Finish Patching: Immediately after the removal of the
forms, remove bulges and projections on exposed concrete by chipping or
tooling, and rub or grind the surface. Chip honeycombed or other
defective areas to solid concrete; cut edges to right angles with the
surface. Brush cavities with a grout of cement and water, and point with
a mortar of cement, sand, and water similar to that used in the
concrete. Keep the concrete thoroughly saturated with water during the
finishing.**

**D. Joint Sealing: Use compressed air to blow dirt and dust from joints
to be sealed. When joints are dry and dust‑free, apply sealant in the
joints according to the manufacturer\'s instructions. The finished
joints shall have no depressions or protrusions and continuous seals
shall be formed along the joints.**

**3.4 CONCRETE CURING**

**A. Curing Time: Cure concrete for a period of 7 calendar days from
time of placement by using one of the following methods:**

**1. The liquid membrane-forming compound shall be sprayed on and shall
be dry to the touch in not more than 4 hours from time of application,
according to Paragraph 7.1, ASTM C 309. This method of curing shall not
be used where additional concrete, mortar, or joint sealant will be
placed against the cured concrete.**

**2. Cover the damp concrete surfaces with impermeable sheets of
polyethylene material or other sheet coverings with joints lapped a
minimum of 6-inches (150 mm) and sealed to keep moisture in.**

**3. Concrete forms may be left in place to provide proper curing of
concrete in contact with the forms. Curing of unformed concrete surfaces
shall be by one of the methods shown above, and shall begin as soon as
the concrete is hard enough to allow application of the curing material.
If forms are removed before the end of the 7-day period, curing by use
of the liquid membrane-forming compound or sheets of polyethylene
material shall begin immediately, and shall continue for the remainder
of the 7-day curing period.**

**3.5 FIELD QUALITY CONTROL**

**A. Testing: \[The Government will perform the compression and slump
tests, record, and distribute the results.\] \[The Government will make
arrangements for a certified, independent testing laboratory to perform
the required compression and slump testing, record and distribute the
results.\] \[Perform the compression and slump tests.\] \[Furnish
necessary equipment, labor, and materials to conduct the testing.\]
\[Testing shall be conducted in the presence of the Contracting Officer
who shall be given 48-hours notice before tests are to be conducted.\]
\[The Contractor shall make arrangements for a certified, independent
testing laboratory, according to the requirements of Section 01458 -
Testing Laboratory Services, to perform the compression and slump
testing, recording, and distributing of the results.\]**

**B. Air Content Test: ASTM C 231. A minimum of one air content test
shall be performed prior to each pour of concrete.**

**C. Compression Tests: A minimum of one set of test cylinders (each set
shall consist of six cylinders) shall be provided each day concrete is
placed. An additional set of test cylinders shall be provided on days
the pour exceeds \[15\] cubic yards (\[11\] cubic meters). The test
cylinders shall be made and cured according to ASTM C 31. Twenty‑four
hours after taking cylinders, they shall be carefully transported to the
testing laboratory for moisture curing. Expense of original sets of
tests will be borne by the \[Government.\]  \[Contractor.\] The concrete
placement locations represented by the test cylinders shall be noted on
record drawings. Test cylinders shall be identified with symbols to
indicate the location where the concrete was obtained for the test. Two
cylinders are to be tested to failure at 7 days and two at 28 days,
according to ASTM C 39. Other cylinders shall be kept for testing in
case the 28‑day test falls below required strength.**

**D. Slump Test: ASTM C 143. A minimum of one slump test shall be
performed for each pour of concrete. **

**3.6 PROTECTION**

**A. Requirements: Concrete shall be protected from mechanical and
chemical damage resulting from construction activities. Floor slabs
shall be protected from impact and wheel traffic as well as staining
resulting from oils, solvents, chemicals, and paints.**

**[PART 4: MEASUREMENT AND PAYMENT]{.underline}**

**4.1 METHOD OF MEASUREMENT**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**WHEN A \"LUMP SUM\" CONTRACT IS USED, DELETE THE TITLE PART 4:
MEASUREMENT AND PAYMENT, AND BOTH ARTICLES FROM THIS SECTION.
MEASUREMENT AND PAYMENT WILL BE ADDRESSED IN PART 4 OF SECTION 01009
-GENERAL INFORMATION AND REQUIREMENTS OR SECTION 01010 - SUMMARY OF
WORK.**

**WHEN NOT A \"LUMP SUM\" CONTRACT, SELECT APPLICABLE PHRASES; USE THE
\"NO MEASUREMENT\" PHRASE WHEN NONE OF THE PAY ITEMS IN THIS SECTION ARE
INCLUDED IN THE BID SCHEDULE.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**A. Units: The work described in this section will \[not be measured
for payment.\] \[be measured and paid for\] \[on a lump sum basis.\]
\[by the cubic yard, based on the dimensions of the structure and the
details shown on the drawings.\] \[No payment will be made for concrete
placed beyond the lines and grades shown.\] \[Reinforcing steel will
\[be measured and paid for by the pound as computed based on the
dimensions and reinforcing details shown on the drawings.\]\] \[not be
paid for separately, but is a part of the payment for concrete.\]\]
\[Clearing and grubbing will be \[paid for separately under Section
02231 ‑ Clearing and Grubbing.\]\] \[included in the bid price for other
items of the Contract.\]\]**

**4.2 BASIS OF PAYMENT**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**WHEN NOT A \"LUMP SUM\" CONTRACT, SELECT APPLICABLE PHRASES; USE THE
\"NO DIRECT PAYMENT\" PHRASE WHEN NONE OF THE PAY ITEMS IN THIS SECTION
ARE INCLUDED IN THE BID SCHEDULE.**

**WHEN NOT A \"LUMP SUM\" CONTRACT AND PAYMENT IS TO BE MADE UNDER THIS
SECTION, SELECT APPLICABLE PAY ITEMS. DO NOT CHANGE PAY ITEM NUMBER.
WHEN GOVERNMENT‑FURNISHED PROPERTY IS SPECIFIED FOR PAY ITEMS, THE
LETTER SUFFIX GF WILL BE ADDED AFTER THE PARENTHESIS OF THE ITEM
NUMBER.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**A. Payment: \[No direct payment for the work described under this
section will be made. Include consideration for this item in the bid
price for other items of the Contract.\] \[Prices and payment will be
full compensation for the work described in this section. Payment will
be made under:\]**

**[Pay Item]{.underline} [ ]{.underline}[Pay Unit]{.underline}**

**03310(01) Structural Concrete Lump Sum**

**03310(02) Structural Concrete Cubic Yard**

**03310(03) Structural Concrete Cubic Meter**

**03310(10) Concrete, Type A Lump Sum**

**03310(11) Concrete, Type A Cubic Yard**

**03310(12) Concrete, Type A Cubic Meter**

**03310(20) Concrete, Type B Lump Sum**

**03310(21) Concrete, Type B Cubic Yard**

**03310(22) Concrete, Type B Cubic Meter**

**03310(30) Reinforcing Steel Pound**

**03310(31) Reinforcing Steel Kilogram**

**END OF SECTION**