READ AND **REMOVE THIS PAGE** BEFORE PLACING

THE SPECIFICATION SECTION IN THE CONTRACT

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O U T L I N E G U I D E

[DIVISION 2 : SITE CONSTRUCTION]{.underline}

SECTION 02732 - CRUSHED STONE SURFACING

USE: Furnishing and placing, and compacting gravel or crushed stone on a
prepared roadbed, then left exposed.

**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.

**DRAWING DATA REQUIRED:** Location and detail drawings as needed.

**REVISIONS OF THIS SECTION:**

CSI format, editorial changes: 12/00

Metric:

Technical Update:

**SECTION 02732**

**CRUSHED STONE SURFACING**

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

**1.1 SUMMARY**

**A. Section Includes: This work shall consist of furnishing, placing
and compacting gravel or crushed stone courses on a prepared roadbed in
accordance with these specifications and in conformity with the lines,
grades, thickness, and typical cross section shown on the drawings or
established by the Contracting Officer.**

**B. Related Sections:**

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**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.**

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**

**1.2 DEFINITIONS**

**A. Coarse Aggregates: The material retained on the No. 4 (4.75 mm)
sieve shall be known as coarse aggregate. Coarse aggregates shall be
reasonably uniform in density and quality. When the coarse aggregate is
supplied from more than one source, aggregate from each source shall
meet these requirements.**

**1. The coarse aggregate shall have a percentage of wear not to exceed
50 percent after 500 revolutions as determined by ASTM C 131.**

**2. The amount of flat and/or elongated particles shall not exceed
20 percent. A flat particle is one having a ratio of width to thickness
greater than three; an elongated particle is one having a ratio of
length to width greater than three. **

**B. Fine Aggregates: The material passing the No. 4 (4.75 mm) sieve
shall be known as fine aggregate. Fine aggregate shall consist of
screenings, sand, soil, or other finely divided mineral matter that is
processed or naturally combined with the coarse aggregate.**

**1.3 SUBMITTALS**

**A. Materials Source: Submit the name, address, and telephone number of
imported materials suppliers.**

**1.4 QUALITY ASSURANCE**

**A. Requirements: Perform work in accordance with \[State of
\_\_\_\_\_\_\] \[County of \_\_\_\_\_\] Highway Standards.**

**1.5 SITE CONDITIONS**

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**THE FIRST SENTENCE OF THIS PARAGRAPH MAY BE DELETED IN LOCALITIES
WHERE FREEZING TEMPERATURES DO NOT OCCUR.**

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**A. Weather Limitations: Do not construct aggregate surface courses
when the ambient temperature is below 35 degrees F (2 degrees C) and on
subgrades that are frozen or contain frost. Surfaces damaged by freeze,
rainfall, or other weather conditions shall be brought to a satisfactory
condition by the Contractor.**

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

**2.1 GENERAL REQUIREMENTS**

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**THIS PARAGRAPH APPLIES TO GENERAL CONDITIONS. SPECIFY OTHER MATERIALS
SUCH AS DISINTEGRATED GRANITE, VOLCANIC ASH OR CINDERS, LIMEROCK, AND
CALICHE WHEN SUPPORTED BY ADEQUATE PERFORMANCE DATA. DELETE THE
REQUIREMENT FOR SOUNDNESS AND PERCENTAGE OF WEAR WHEN LOCAL EXPERIENCE
INDICATES THE MATERIAL IS SATISFACTORY.**

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**A. Crushed Aggregate: Aggregate shall consist of hard, durable
particles or fragments of stone or gravel crushed to the size and of the
quality requirements for crushed aggregate materials normally used
locally in the construction and maintenance of highways by Federal or
State agencies and shall be according to AASHTO M 147. Aggregates shall
be uniformly graded from course to fine and shall be free of vegetable
matter and clay balls.**

**2.2 SPECIFIC REQUIREMENTS**

**A. Surface Course Aggregates: The surface aggregates shall have a
maximum size of 3/4‑inch; plasticity index for surface aggregates shall
not be less than 4 or greater than 9. **

**B. Base Aggregates: Shall have a maximum size of 1 1/4‑inch.
Plasticity index for base aggregates shall be less than 6. \[Base course
materials shall have a bearing ratio of at least 100 as determined by
laboratory tests on a 4-day soaked specimen in accordance with
ASTM D 1883.\]**

**C. Quality Control: The Contracting Officer may conduct quality
control reviews to determine the reliability of the certifications. If
the reviews indicate that the certifications are not reliable,
acceptance by certification will be discontinued. Costs to the
Government for sampling and testing may be charged against the
Contractor and may be deducted from the payment for the work.**

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

**3.1 PREPARATION OF UNDERLYING SUBGRADE**

**A. Requirements: The underlying subgrade, including shoulders, shall
be cleaned of foreign substances. At the time of surface course
construction, the underlying subgrade shall contain no frozen material.
Ruts and soft yielding spots in the underlying subgrade and areas having
inadequate compaction and deviations of the surface from these
specifications shall be corrected by loosening and removing soft or
unsatisfactory material and by adding approved material, reshaping to
line and grade and recompacting to density requirements specified. The
completed underlying subgrade shall not be disturbed by traffic or other
operations and shall be maintained by the Contractor in a satisfactory
condition until the surface course is placed.**

**B. Preparation of Roadbed Including Parking Areas and Yards: All slide
material including culvert inlet and outlet debris, shall be removed and
the existing roadbed, including parking areas shall be scarified,
bladed, and shaped to reasonably close conformity with the line, grade,
and cross sections shown on the plans or established by the Contracting
Officer. Any high places in the road‑bed shall be cut to grade and the
resulting material hauled and deposited on low areas on fill slopes as
directed by the Contracting Officer. Should there remain any depressions
or narrow embankments, sufficient approved material shall be obtained
and placed to bring the width and/or surface of the roadway in
reasonably close conformity with the lines, grades and cross sections
shown on the plans or established by the Contracting Officer. The
road‑bed shall then be rebladed and reshaped. At intersections, the
roadbeds of side roads shall be treated similarly, as governed by the
grading performed, to provide for proper joining of the proposed and
existing riding surfaces.**

**3.2 CONSTRUCTION REQUIREMENTS**

**A. Mixing: Each course placed shall be mixed to its full depth by
means of power graders, traveling mixers or other approved mixing
equipment. During the mixing, water shall be added in the amount
necessary to provide the optimum moisture content for compaction.
Spreading shall be completed within 24 hours after mixing.**

**B. Placing: The material shall be placed on the prepared roadbed in
layers of the uniform thickness with a spreader as shown on the plans.
Courses of(6 inches)150 mm or less in thickness shall be placed in a
single layer. When a compacted thickness of more than 6 inches (150 mm)
is required, no layer shall exceed 6 inches (150 mm) nor be less than 3
inches (75 mm) when compacted. Each layer shall be shaped and compacted
before the succeeding layer is placed.**

**1. Stationary‑Plant Method: Mix aggregates and water until a uniform
homogeneous mixture is obtained. Do not dump materials in piles; place
in layers of essentially uniform thickness, not to exceed 6 inches (150
mm) after compaction, by an approved spreader. Tail gate spreading will
be acceptable only with permission, under conditions such as where space
limitations prohibit use of the spreader.**

**2. Windrow Traveling‑Plant Method: Place aggregates in windrows of
such cross section and proportions that, when picked up, mixed, and
redeposited in windrows, the finished mixture shall conform to the
specified requirements. Do not exceed the rated capacity of the
traveling plant with the size of the windrow of the combined materials.
Add water, in quantity sufficient to provide the necessary moisture
content for compacting, to the aggregates at the time of mixing. Mix
materials uniformly by the traveling plant, deposit in windrows of
uniform cross section, and spread in a layer of uniform thickness to the
required contour and grades.**

**3. When hauling is done over previously placed material, hauling
equipment shall be routed as uniformly as possible over the entire width
of previously constructed layers.**

**C. Compacting: Immediately following final placing and spreading, each
layer shall be compacted full width by approved means of compacting
equipment. Rolling shall progress gradually from the side to the center,
parallel with the centerline of the road or parking area, and shall
continue until all the surface has been rolled. Irregularities or
depressions that develop shall be corrected by loosening the material at
these places and adding or removing material until the surface is smooth
and uniform. Along curbs, headers, and walls, and at all places not
accessible to the roller, the base material shall be compacted
thoroughly with approved tampers or compactors.**

**1. Compaction of each layer shall continue until a density of not less
than 95 percent of the maximum density determined according to AASHTO T
180, Method D, or other approved method, has been achieved.**

** 2. In‑place field density determinations will be made according to
AASHTO T 191, T 205, or other approved method. The use of AASHTO T 224
to correct for oversize particles may be required.**

** 3. The Contracting Officer will make measurements of test holes at
random during progress of the work to determine the depth of uncompacted
layers required to produce the designated depth of material after
compacting to the specified density.**

** 4. Cutting of the test holes and refilling with materials properly
compacted shall be done by the Contractor under the supervision of the
Contracting Officer.**

**D. Thickness Requirements: The thickness of the completed course shall
not vary more than 1/2 inch (50 mm) from the thickness shown on the
plans.**

**E. Surface Requirements: When directed by the Contracting Officer, the
surface shall be tested with a 10 foot (3 m) straight‑edge furnished and
operated by the Contractor. Any areas where the surface variation
exceeds 1/2 inch in 10 feet (50 mm in 3000 mm ) shall be reworked until
the variation falls within this limit.**

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

**4.1 METHODS OF MEASUREMENT**

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**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 OR
SECTION 01010.**

**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.**

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**A. Method: The quantity to be paid for will be the number of cubic
yards measured in the hauling vehicle at the point of delivery, or tons
of material placed, compacted and accepted in the completed course.
Weighing of material shall be at Contractor\'s expense. A weight receipt
for each load of material shall be furnished by the Contractor. BLM Form
#DSC 9100‑3 ‑ Materials Receipt may be used for this purpose.**

**4.2 BASIS OF PAYMENT**

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**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 THERE IS MORE THAN ONE SIZE OF TRENCH OR BEDDING SPECIFIED ON THE
PROJECT, THERE SHOULD BE SEPARATE PAY ITEMS FOR EACH TYPE.**

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**A. General: The accepted quantities, determined as provided above,
will be paid for at the contract unit price per unit of measurement for
the pay items listed below that are shown in the bid schedule, which
price and payment will be full compensation for furnishing and placing
all materials, including all labor, equipment, tools, and incidentals
necessary to complete the work prescribed in this section. Compaction
water will not be paid for separately but will be considered as a
subsidiary obligation of the Contractor incidental to work specified.**

** Payment will be made under:**

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

**02732(1) Crushed Aggregate Base Yard (Cubic Meter)**

**02732(2) Crushed Aggregate Base Ton**

**02732(3) Crushed Aggregate Surface Yard (Cubic Meter)**

**02732(4) Crushed Aggregate Surface Ton**

**END OF SECTION**