### **ITEM P-304 CEMENT-TREATED BASE COUSE**

#### DESCRIPTION

**304-1.1** This item shall consist of a cement-treated base (CTB)
course composed of mineral aggregate and cement, uniformly blended and
mixed with water. The mixed material shall be spread and shaped with a
mechanical spreader, and compacted with rollers in accordance with these
specifications and in conformance to the lines, grades, dimensions, and
cross-sections shown on the plans.

#### MATERIALS

**304-2.1 AGGREGATE.** The aggregate shall be select granular materials,
comprised of crushed or uncrushed gravel and/or stone, or recycled
crushed and graded portland cement concrete (PCC). The material shall be
free of roots, sod, and weeds. The crushed or uncrushed aggregate shall
consist of hard, durable particles of accepted quality, free from an
excess of soft, flat, elongated, or disintegrated pieces, and
objectionable matter. The method used in producing the aggregate shall
be such that the finished product is as consistent as practicable. All
stones and rocks of inferior quality shall be wasted. When recycled PCC
is used as the aggregate, it must meet the requirements for virgin
aggregate.

The percentage of wear of the crushed aggregate retained on the No. 4
(4.75-mm) sieve shall not be greater than 40 percent when tested in
accordance with ASTM C 131. The sodium sulfate soundness loss shall not
exceed 10 percent, or the magnesium sulfate soundness loss shall not
exceed 13 percent, after five cycles, when tested in accordance with
ASTM C 88.

When tested in accordance with ASTM C 136, the aggregate shall conform
to the gradations shown in Table 1. An aggregate blend that meets the
requirements of Table 1 shall be selected by the Contractor and used in
the final mix design. The final aggregate blend shall be well graded
from coarse to fine within the limits designated in the table and shall
not vary from the low limit on one sieve to the high limit on adjacent
sieves, or vice versa. The portion of final aggregate blend passing the
No. 40 (425-µm) sieve shall have a liquid limit of not more than 25 and
a plasticity index of not more than 6 when tested in accordance with
ASTM D 4318.

### Table 1. Aggregate gradation for CTB material. {#table-1.-aggregate-gradation-for-ctb-material. .Style-Heading-3Heading-3-CharHeading-3-Char1-CharHeading-3-Char-...}

  -------------------- ------------------------ --------------------------
  **Sieve Size**       **Percentage by Weight   
                       Passing Sieves**         

                       **Gradation A**          **Gradation B**

  2 in (51 mm)         100 ^1^                  100 ^1^

  No. 4 (4.75 mm)      45 - 100                 55 - 100

  No. 10 (1.80 mm)     37 - 80                  45 - 100

  No. 40 (450 m)       15 - 50                  25 - 80

  No. 80 (210 m)       0 - 25                   10 - 35
  -------------------- ------------------------ --------------------------

^1^ Maximum size of aggregate is 1 in (25.4 mm) when used as a base

course under Item P-501, Portland Cement Concrete Pavement.

All aggregate samples required for testing shall be furnished by the
Contractor at the expense of the Contractor. Sampling shall be performed
by the Contractor in accordance with ASTM D 75.

**304-2.2 CEMENT.** Cement shall conform to the requirements of ASTM \[
\].

> \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
> \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
>
> The Engineer shall specify ASTM C 150 Type I, II, III, IV, or V or
> ASTM C 595 Type IS, IS-A, IP, IP-A, P, or PA. Type II cement shall be
> specified in areas with a history of sulfate reaction with the
> selected aggregate.
>
> \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
> \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*

**304-2.3 CEMENTITIOUS ADDITIVIES**. Pozzolanic and ground granulated
blast furnace (GGBF) slag may be added to the CTB mix. If used, each
material must meet the following requirements:

a.  Pozzolan. Pozzolanic materials must meet the requirements of ASTM C
    618, Class C, F, or N with the exception of loss of ignition, where
    the maximum shall be less than 6 percent for Class F or N. \[The
    supplementary optional chemical and physical properties of tables 1A
    and 2A contained in ASTM C 618 shall apply\].

b.  GGBF Slag. Slag shall conform to ASTM C 989, Grade 80, 100, or 120.

**304-2.4 WATER**. Water used in mixing or curing shall be clean and
free of oil, salt, acid, alkali, sugar, vegetable, or other deleterious
substances injurious to the finished product. Water shall be tested in
accordance with the requirements of AASHTO T 26. Water known to be of
potable quality may be used without testing.

**304-2.5 CURING MATERIALS**. Curing materials shall conform to the
requirements provided below, as defined by the type of pavement surface
to be placed on top of the CTB layer.

**304-2.5.1 Portland Cement Concrete (PCC) Pavement**. For curing CTB
placed under PCC pavement, use white-pigmented, liquid membrane-forming
compound conforming to ASTM C 309, Type 2, Class A or Class B
(wax-based).

**304-2.5.2 Hot Mix Asphalt (HMA) Pavement**. For curing CTB placed
under HMA pavement, use emulsified asphalt conforming to ASTM C 977 or
ASTM D 2397 (Table 2).

> \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
> \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
>
> If emulsified asphalt is allowed as a curing agent, the Engineer shall
> specify
>
> the type and grade of material to be used and the corresponding
> application temperature from Table 2.

Table 2. Emulsified asphalt curing material.

  ------------------ ------------------- ------------------- -----------------
  **Type and Grade** **Specification**   **Application       
                                         Temperature**       

                                         **°F**              **°C**

  Emulsified Asphalt                                         

  RS-1, SS-1         ASTM D 977          75 - 130            25 - 55

  CRS-1              ASTM D 2397         75 - 130            25 - 55
  ------------------ ------------------- ------------------- -----------------

> \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
> \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*

**304-2.6 SAND BLOTTER**. If emulsified asphalt is used as a curing
material, sand shall be applied, when required, for the prevention of
pick-up of emulsion curing materials. The sand material shall be clean,
dry, and non-plastic.

#### COMPOSITION OF MIXTURE

**304-3.1 GENERAL**. The CTB material shall be composed of a mixture of
aggregate, \[Portland cement\] \[blended hydraulic cement\], and water.
Fly Ash or GGBF slag may be used as a partial replacement for Portland
cement.

304-3.2 MIX DESIGN. The mix design shall utilize a cement content that,
when tested in the laboratory according to ASTM D 1633, produces a 7-day
compressive strength meeting the following requirements:

a.  For CTB placed under PCC pavement: 500 psi (3,447 kPa) minimum and
    1,000 psi (6,895 kPa) maximum.

b.  For CTB placed under HMA pavement: 750 psi (5,170 kPa) minimum and
    1,000 psi (6,895 kPa) maximum.

> \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
> \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
>
> In areas subject to considerable wet-dry and/or freeze-thaw cycles,
> insert the following statement:
>
> "Wet-dry and/or freeze-thaw tests shall be performed in accordance
> with ASTM D 559 and D 560, respectively. The weight loss for each type
> of test shall not exceed 14 percent after 12 cycles. However, if a
> 7-day compressive strength of 750 psi (5,170 kPa) is achieved, the
> wet-dry and freeze-thaw tests are not necessary."
>
> An estimated cement content may be determined from Table 1, Chapter 2,
> of the Soil-Cement Laboratory Handbook, published by the Portland
> Cement Association (PCA). In designing the mixture, cement contents
> above and below the initial estimated amount should be tested to
> determine the minimum quantity of cement needed to achieve the
> required strength (or strength and durability where freeze-thaw
> resistance is deemed necessary by the Engineer).
>
> \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
> \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*

The mix design shall include a complete list of materials, including
type, brand, source, and amount of cement, fine aggregate, coarse
aggregate, water, and cementitious additives, if used. It shall also
contain the 7-day compressive strength test results and the results of
the wet-dry and/or freeze-thaw tests.

Should a change be made in aggregate sources or type of cement, or if
cementitious additives are added or deleted from the mix, production of
the CTB mix shall be stopped and a new mix design shall be submitted.

**304-3.3 SUBMITTALS.** At least \[ \] days prior to the placement of
the CTB, the Contractor shall submit certified test reports to the
Engineer for those materials proposed for use during construction, as
well as the mix design information for the CTB material. Tests older
than 6 months shall not be used. The certification shall show the ASTM
or AASHTO specifications or tests for the material, the name of the
company performing the tests, the date of the tests, the test results,
and a statement that the material did or did not comply with the
applicable specifications. The submittal package shall include the
following:

a.  Sources of materials, including aggregate, cement, cementitious
    additives, curing, and bond-breaking materials.

b.  Physical properties of the aggregates, cement, cementitious
    additives, curing, and bond-breaking materials.

c.  Mix design

    -   mix identification number.

    -   aggregate gradation.

    -   cement content.

    -   water content.

    -   cementitious materials content.

> d\. Laboratory test results

-   compaction and strength testing procedures.

-   laboratory compaction characteristics (maximum dry density and
    optimum moisture content).

-   compressive strength at 7 days.

-   Wet-dry and/or freeze-thaw weight loss, if applicable.

No CTB material shall be placed until the submittal is accepted in
writing by the Engineer.

During production, the Contractor shall submit batch tickets for each
delivered load.

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> \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
>
> Insert the appropriate number of days for Contractor submittal of
> certified test reports for the proposed materials; 10 to 20 days is
> typical.
>
> \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
> \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*

#### EQUIPMENT

All equipment necessary to mix, transport, place, compact, and finish
the CTB material shall be furnished by the Contractor. The equipment
shall be inspected and approved by the Engineer at the job site prior to
the start of construction operations.

**304-4.1 MIXING.** The mixer shall be a batch or continuous-flow type
stationary mixer and shall be equipped with calibrated metering and
feeding devices that introduce the aggregate, cement, water, and
cementitious additives (if used) into the mixer in the specified
quantities. If necessary, a screening device shall be used to remove
oversized material greater than 2 in (51 mm) from the raw aggregate feed
prior to mixing.

Free access to the plant must be provided at all times for inspection of
the plant's equipment and operation and for sampling the CTB mixture and
its components, as deemed necessary by the Engineer.

**304-4.2 HAULING**. The mixed CTB material shall be transported from
the plant to the job site in trucks or other hauling equipment having
beds that are smooth, clean, and tight. Truck bed covers shall be
provided and used to protect the CTB from rain. CTB material that
becomes wet during transport shall be subject to rejection.

**304-4.3 PLACING**. CTB material shall be placed using a mechanical
spreader or a machine capable of receiving, spreading, and shaping the
mixture without segregation into a uniform layer or lift. The equipment
shall be equipped with a strike-off plate capable of being adjusted to
the specified layer thickness. It shall also be equipped with two end
gates or cut off plates, so that the CTB may be spread in widths varying
up to lane width.

**304-4.4 COMPACTION**. Compaction of the CTB layer shall be
accomplished using one or a combination of the following pieces of
equipment:

-   Tamping or grid roller.

-   Steel-wheeled roller

-   Vibratory roller.

-   Pneumatic-tire roller.

-   Vibrating plate compactor (for areas inaccessible to rollers).

The number, type, and weight of rollers and/or compactors shall be
sufficient to compact the mixture to the required density.

**304-4.5 FINISHING**. Final trimming of the compacted CTB to meet
surface requirements shall be accomplished using a self-propelled grader
or trimming machine, with a mold board cutting edge, which is at least
12 ft (3.7 m) wide and is automatically controlled by sensors in
conjunction with an independent grade control from a taut stringline.
Stringline will be required on both sides of the sensor controls for the
pilot lane. For all other lanes, a single stringline on the outside and
grade matching with previously completed adjacent lanes is permissible.

# 

#### CONSTRUCTION METHODS

**304-5.1 WEATHER LIMITATIONS**.

**304-5.1.1 Cold Weather***.* The CTB material shall not be mixed or
placed while the air temperature is below 40°F (4°C) or when conditions
indicate that the temperature may fall below 35°F (2°C) within 24 hours.
The CTB shall not be placed on frozen surfaces.

**304-5.1.1 Rain***.* The CTB may not be placed when rainfall is
occurring. If an unexpected rain event occurs during placement, the
layer should be quickly compacted. CTB material that becomes wet by rain
during transport or placement shall be evaluated by the Engineer, and
may be subject to rejection.

**304-5.2 PREPARATION OF UNDERLYING COURSE**. The underlying course
shall be checked by the Engineer before placing and spreading operations
are started, in order to ensure that it is free of any ruts,
depressions, or bumps and is finished to the correct grade. Any ruts or
soft yielding places caused by improper drainage conditions, hauling, or
any other cause, shall be corrected before the CTB mixture is placed
thereon. The underlying course shall be wetted in advance of placing the
CTB layer. The final prepared grade prior to placing the CTB should be
in a firm and moist condition free of frost. Use of chemicals to
eliminate frost will not be permitted.

To ensure proper drainage, placement of the base shall begin along the
centerline of the pavement on a crowned section or on the highest
elevation contour of a pavement with variable cross slope.

**304-5.3 GRADE CONTROL**. Grade control between the edges of the CTB
shall be accomplished at intervals of 50 ft (15.2 m) or less on the
longitudinal grade and at 25 ft (7.6 m) or less on the transverse grade.

**304-5.4 HANDLING, MEASURING, AND BATCHING**. The continuous flow
central plant site, layout, equipment, and provisions for transporting
material shall assure a

continuous supply of material to the work. Aggregate stockpiles shall be
constructed in a manner that prevents segregation and intermixing of
deleterious materials.

Aggregates that are segregated or mixed with earth or foreign material
will not be accepted.

Continuous flow plants shall be equipped with feeders to proportion
aggregates and bulk cement, by weight, automatically and accurately.
When bulk cement is used, the Contractor shall use a suitable method of
handling the cement from weighing hopper to transporting container or
into the batch itself for transportation to the mixer, such as a chute,
boot or other device, to prevent loss of cement. The device shall be
arranged to provide positive assurance that the cement content specified
is present in each batch.

**304-5.5 MIXING**. Aggregate and cement may be proportioned either by
weight or volume, and shall be mixed sufficiently to prevent the forming
of cement balls when water is added. The mixing time shall be that which
is required to secure an intimate, uniform mixture of aggregate, cement,
water, and pozzolan (if used). The minimum mixing time will be based on
the uniformity and consistency of the mixture.

**304-5.6 PLACING.** The CTB mixture shall be deposited on the moistened
subgrade or subbase and spread into a uniform layer of such width and
thickness that, following compaction and trimming, conforms to the
required grade and cross-section. The Contractor may install the CTB
layer in single or multiple compacted lifts; however, each compacted
lift must be no greater than 6 in (152 mm) thick. In multi-lift
construction, the surface of the compacted lift shall be kept moist
until covered with the next lift. Successive lifts shall be placed and
compacted so that the required total depth of the CTB layer is completed
within 12 hours.

A single spreader may be used, provided it is capable of placing a
uniform, full-depth layer of material across the full width of the base
in one pass. Otherwise, two or more spreaders will be required, and
shall be operated so that spreading progresses along the full width of
the base in a uniform manner.

**304-5.7 COMPACTION**. Immediately upon completion of the spreading
operations, the CTB material shall be thoroughly compacted using
approved compaction equipment. At the start of compaction, the moisture
content shall be within 2 percentage points of the specified optimum
moisture.

**304-5.8 FINISHING.** Upon completion of compaction, the surface of the
CTB layer shall be shaped to the specified lines, grades, and
cross-section. During the finishing process, the surface shall be kept
moist by means of fog-type sprayers. Compaction and finishing shall be
done in such a manner as to produce a smooth, dense surface, free of
ruts, cracks, ridges, and loose material. All placement, compaction, and
finishing operations shall be completed within 2 hours from the start of
mixing. Material not completed within the 2-hour time limit shall be
removed and replaced at the Contractor's expense.

CTB layer limits that extend beyond the edges of the new PCC surface
course shall be rolled down or shaped in such a manner that the drainage
is away from the new PCC surface course edge.

**304-5.9 CONSTRUCTION JOINTS**. At the end of each day\'s construction,
a transverse construction joint shall be formed that is a true vertical
face (perpendicular to the centerline) and is free of loose material.

Longitudinal construction joints (parallel to the centerline) shall be
formed to a consistent, well-defined near vertical edge that is free of
loose material. The longitudinal joints shall be located such that there
is a 2-ft (0.6-m) minimum offset from planned joints in any overlying
layer.

While forming construction joints, the Contractor shall make sure the
material in the joint area is adequately compacted and that the joints
are finished level and even with the remainder of the CTB layer.

**304-5.10 CURING.** The compacted and finished CTB shall be cured with
the approved curing agents as soon as possible, and in no case later
than 2 hours after completion of the finishing operations. The layer
shall be kept moist using a moisture-retaining cover or a light
application of water until the curing material is applied.

When asphalt emulsion is used as the curing agent, the entire surface of
the CTB layer shall be uniformly sprayed with the emulsion at a rate of
between 0.15 and 0.30 gal/yd^2^ (0.7 and 1.4 L/m^2^); the exact
temperature and rate of application being that required to achieve
complete and uniform coverage without runoff. Should it be necessary for
construction equipment or other traffic to use the asphalt-covered
surface, sufficient sand blotter cover shall be applied to prevent
pick-up.

When liquid membrane-forming curing compound is used as the curing
agent, the entire surface of the CTB layer shall be uniformly sprayed
with the compound at the rate of 1 gal (3.8 L) to not more than 200
ft^2^ (18.6 m^2^). The rate of application shall be determined such that
a uniform surface is obtained. The spraying equipment shall be of the
fully atomizing type equipped with a tank agitator. The compound shall
be thoroughly mixed with the pigment uniformly dispersed throughout the
storage tank. During application, the compound shall be stirred
continuously by effective mechanical means. Hand spraying of odd widths
or shapes and CTB surfaces exposed by the removal of forms is permitted.

The curing seal shall be maintained and protected until the pavement is
placed. Should the surface of the finished CTB and/or the curing seal
become damaged, additional curing material shall be applied at the time
it is damaged or when the damage is first observed.

**304-5.11 PROTECTION**. The Contractor shall protect the finished CTB
against traffic. Completed portions of the CTB layer can be opened
immediately to low-speed traffic and to construction equipment, provided
the curing material is not damaged and the CTB is sufficiently stable to
resist permanent deformation. Should the CTB be damaged, it shall be
replaced using full-depth patches, and sprayed with the selected curing
compound as described above. The CTB shall also be protected from
freezing at all times.

**304-5.12 BOND-BREAKER.** When the CTB is to be placed directly beneath
PCC, a bond-breaker selected by the Contractor shall be used. The entire
surface of the CTB shall be coated with a de-bonding compound applied in
a quality sufficient to prevent bonding of the PCC pavement to the base
course. If an impervious membrane or asphalt emulsion is used as a
curing material, additional applications of curing materials may be
required. The Contractor shall be responsible for selecting the
de-bonding compound and determining the necessary application rate. The
de-bonding compound shall be approved by the Engineer prior to being
incorporated into the work.

#### MATERIAL ACCEPTANCE

**304-6.1 ACCEPTANCE SAMPLING AND TESTING**. All acceptance sampling and
testing, with the exception of thickness determination, necessary to
determine conformance with the requirements specified in this section
will be performed by the Engineer. The Contractor shall provide the
required CTB samples during construction for acceptance testing
purposes. The samples shall be taken in the presence of the Engineer.

Testing organizations performing these tests shall meet the requirements
of ASTM D 3666. All test equipment in Contractor-furnished laboratories
shall be calibrated by the testing organization prior to the start of
operations.

The CTB layer shall be tested for density, thickness, grade, and surface
tolerance on a lot basis, with a lot consisting of one of the following:

-   One day's production not to exceed \[2,000 yd^2^ (1,675 m^2^)\].

-   A half day's production, where a day's production consists of
    \[2,000 to 4,000 yd^2^ (1,675 to 3,350 m^2^)\].

Each lot shall be divided into four (4) equal sublots. Within each
sublot, one (1) density test, one (1) thickness measurement, and
continuous surface straightedge tests (surface tolerance testing) shall
be performed, as described below. Sampling locations shall be determined
by the Engineer in accordance with the random sampling procedures
contained in ASTM D 3665.

In the event that only three (3) sublots are produced, the three sublots
shall constitute a complete lot. If one (1) or two (2) sublots are
produced for the same reason, they shall be incorporated into the next
or previous lot, and the total number of sublots shall be used in the
acceptance criteria calculation.

End-of-production sublots (i.e., sublots associated with the final
placement of CTB for the project and are less than a complete lot) shall
be handled as follows:

-   Three (3) sublots shall constitute a lot.

-   One (1) or two (2) sublots shall be incorporated into the previous
    lot.

**304-6.1.1 Density Testing.** CTB samples shall be taken from each
sublot and used to create laboratory test specimens representing the
various sublots. The specimens shall be compacted and tested for density
and moisture content in accordance with ASTM D 558. Using the density
results for each sublot comprising a lot, an average density for the lot
shall be determined, which will serve as the basis for acceptance of the
lot with regard to density.

Within each sublot in the field, one (1) in-place density test shall be
performed in accordance with ASTM D 1556, ASTM D 2167, or ASTM D 2922
and ASTM D 3017. The location of the test shall be randomly selected in
accordance with the procedures contained in ASTM D 3665. The in-place
density results for each sublot comprising the lot shall then be
averaged and compared with the corresponding average lot density.
Acceptance criteria for CTB density are provided in paragraph 304-6.2.1.

**304-6.1.2 Thickness Testing.** The CTB shall be tested for thickness
using the same lot and sublot designations established for density
testing. After 3 days of curing, one (1) 4-in (102-mm) diameter core per
sublot shall be obtained from a random location, as identified using the
procedures contained in ASTM D 3665. The thickness of each sampled core
shall be determined using the caliper measurement procedures provided in
ASTM C 174. The average thickness for the lot shall be determined using
the individual sublot core thicknesses. Acceptance criteria for CTB
thickness are provided in paragraph 304-6.2.2. At all locations where
cores have been drilled, the resulting core holes shall be filled by the
Contractor with CTB, HMA, or non-shrink grout.

**304-6.1.3 Grade Testing**. The elevations of the finished CTB shall be
surveyed every 25 ft (7.6 m) on both sides of the CTB lane as soon as it
has hardened sufficiently. Acceptance criteria for CTB grade are
provided in paragraph 306-6.2.3.

**304-6.1.4 Surface Tolerance Testing**. As soon as the CTB has hardened
sufficiently, it shall be tested for surface tolerance with a 16-ft
(4.9-m) straightedge or other approved measuring device.

**304-6.2 ACCEPTANCE CRITERIA**. Acceptance of CTB will be based on
density, thickness, grade, and surface tolerance, as described in the
paragraphs below.

**304-6.2.1 Density Requirements**. With respect to density, each lot of
compacted material will be accepted without adjustment if the average
in-place density of the lot is equal to or greater than 98 percent of
the average density determined for the lot. Each lot of compacted CTB
shall be accepted and payment adjusted in accordance with Table 3.

Table 3. Sliding pay scale factors for density.

  --------------------------------------- -------------------------------
  **Average Dry Density (%)**             **Payment (%)**

  98.0 and greater                        100

  97.0 - 97.9                             95

  96.0 - 96.9                             90

  95.0 - 95.9                             75

  Less than 95.0                          Reject
  --------------------------------------- -------------------------------

If the average density is below 95 percent, the lot will be rejected and
shall be removed and replaced at the Contractor's expense. In
multi-layer construction, density shall be tested for each lift, and all
lifts within a rejected lot shall be removed and replaced. No payment
shall be made for removed lifts. Replacement lifts shall be paid in
accordance with this section.

**304-6.2.2 Thickness Requirements**. The completed thickness shall be
as shown on the plans. When the average lot thickness is not deficient
by more than ½ in (12.5 mm) from the plan thickness, full payment shall
be made. If the average lot thickness is deficient by more than 1 in
(25.4 mm), it shall be removed and replaced at the Contractor's expense.
When such measurement is deficient by more than ½ in (12.5 mm) but less
than 1 in (25.4 mm) from the plan thickness, one additional core shall
be taken at random from each sublot within the lot. The thickness of
these additional cores shall be determined as indicated in paragraph
304-6.1.2. A new average lot thickness shall be recomputed based on
these additional cores and the original cores taken from each sublot. If
the recomputed average lot thickness is not deficient by more than ½ in
(12.5 mm) from the plan thickness, full payment shall be made. If the
average lot thickness is deficient by more than ½ in (12.5 mm) from the
plan thickness, the entire lot shall be removed and replaced at the
Contractor\'s expense or shall be permitted to remain in-place at an
adjusted payment of 75 percent of the contract unit price.

When the measured thickness is more than that indicated on the plans, it
will be considered as conforming to the requirements, provided the
surface of the completed CTB layer is within the established grade and
surface tolerance requirements.

**304-6.2.3 Grade Requirements**. When the completed surface is higher
than ½ in (12.5 mm) above the grade shown in the plans, the surface
shall be trimmed, at the Contractor's expense, with an approved grinding
machine to an elevation that falls within a tolerance of ¼ in (6 mm) or
less.

**304-6.2.4 Surface Tolerance Requirements**. The finished surface shall
not vary more than ⅜ in (9.5 mm) when tested with a 16-ft (4.9-m)
straightedge applied parallel with, or at right angles to, the
centerline of the CTB area. Areas in the CTB showing high spots greater
than ⅜ in (9.5 mm) over 16 ft (4.9 m) shall be marked and immediately
trimmed with an approved grinding machine. Such trimming shall be at the
Contractor's expense.

#### METHOD OF MEASUREMENT

**304-7.1 CEMENT-TREATED BASE COURSE**. The quantity of cement-treated
base course to be paid for will be determined by measurement of the
number of \[yd^2^ (m^2^)\] of CTB actually constructed and accepted by
the Engineer as complying with the plans and specifications.

#### BASIS OF PAYMENT

**304-8.1 CEMENT-TREATED BASE COURSE**. Payment shall be made at the
contract unit price per \[yd^2^ (m^2^)\] for cement-treated base course.
This price shall be full compensation for furnishing all materials,
including cement; for all preparation, manipulation, placing, and curing
of these materials; and for all labor, equipment, tools, and incidentals
necessary to complete the item.

Each lot of CTB material will be accepted for density at the full
contract price adjusted in accordance with Table 3 in paragraph
304-6.2.1.

Payment will be made for cement-treated base course\--per \[yd^2^
(m^2^)\].

# 

#### TESTING REQUIREMENTS

ASTM C 88 Soundness of Aggregates by Use of Sodium Sulfate or

Magnesium Sulfate

ASTM C 131 Resistance to Degradation of Small-Size Coarse Aggregate

by Abrasion and Impact in the Los Angeles Machine

ASTM C 136 Sieve or Screen Analysis of Fine and Coarse Aggregate

ASTM C 174 Measuring Thickness of Concrete Elements Using Drilled

Concrete Cores

ASTM D 75 Sampling Aggregates

ASTM D 558 Moisture-Density Relations of Soil-Cement Mixtures

ASTM D 559 Test Methods for Wetting & Drying Compacted Soil Cement

Mixtures

ASTM D 560 Freezing-and-Thawing Tests of Compacted Soil-Cement Mixtures

ASTM D 1556 Density of Soil in Place by the Sand-Cone Method

ASTM D 1633 Compressive Strength of Molded Soil-Cement Cylinders

ASTM D 2167 Density of Soil in Place by the Rubber-Balloon Method

ASTM D 2922 Density of Soil and Soil-Aggregate in Place by Nuclear
Methods

ASTM D 3017 Water Content of Soil and Rock in Place by Nuclear Methods

ASTM D 3665 Random Sampling of Paving Materials

ASTM D 3666 Minimum Requirements for Agencies Testing and Inspecting

Road and Paving Materials

ASTM D 4318 Liquid Limit, Plastic Limit, and Plasticity Index of Soils

AASHTO T 26 Quality of Water to be Used in Concrete

#### MATERIAL REQUIREMENTS

ASTM C 150 Portland Cement

ASTM C 309 Liquid Membrane-Forming Compounds for Curing Concrete

ASTM C 595 Blended Hydraulic Cements

ASTM C 618 Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use as
a

Mineral Admixture in Concrete

ASTM C 989 Ground Granulated Blast-Furnace Slag for Use in Concrete

and Mortars

ASTM D 977 Emulsified Asphalt

ASTM D 2397 Cationic Emulsified Asphalt

**End P-304**