am_6.pdf

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Attached to: FSH VEHICLE MAINTENANCE FACILITY for Small Business Southwestern Division U. S. Army Corp of Engineers. Magnitude of Construction $10, 000, 000 to $25, 000, 000.
Solicitation number: W9126G-13-R-0010
Issued by: Department of the Army Corps of Engineers Engineering District Fort Worth

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am_5.pdf	PDF	Nov 28, 2012
W9126G-13-R-0010-0004_Amendment_FSH-VMF.pdf	PDF	Nov 20, 2012
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W9126G-13-R-0010-0001_Amendment_FSH-VMF(rv1).pdf	PDF	Oct 24, 2012
FEDBIZOPS_Solicitation_Posting_Notice_W9126G-13-R-0010_19OCT2012.docx	DOCX document	Oct 22, 2012
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AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER (Type or print)

30-105-04 EXCEPTION TO SF 30

APPROVED BY OIRM 11-84

STANDARD FORM 30 (Rev. 10-83) Prescribed by GSA

FAR (48 CFR) 53.243

The Solicitation for VMF TEMF and COF at Fort Sam Houston, Texas , is amended as follows:

See SF30 Continuation Sheet(s)

NOTE: Proposal Receipt date is 3 December 2012, 12:00 p.m.,CDT, as previously announced.

1. CONTRACT ID CODE PAGE OF PAGES

J 1 3

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

16C. DATE SIGNED

16B. UNITED STATES OF AMERICA 15C. DATE SIGNED 15B. CONTRACTOR/OFFEROR

(Signature of Contracting Officer) (Signature of person authorized to sign)

8. NAME AND ADDRESS OF CONTRACTOR (No., Street, County, State and Zip Code) X 9A. AMENDMENT OF SOLICITATION NO.

W9126G-13-R-0010

X 9B. DATED (SEE ITEM 11)

22-Oct-2012

10B. DATED (SEE ITEM 13)

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

X The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offer is extended, X is not extended.

Offer must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended by one of the following methods:

(a) By completing Items 8 and 15, and returning copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE

CONTRACT ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(B).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

E. IMPORTANT: Contractor is not, is required to sign this document and return copies to the issuing office.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

10A. MOD. OF CONTRACT/ORDER NO.

2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO.(If applicable)

6. ISSUED BY

3. EFFECTIVE DATE

28-Nov-2012

CODE

US ARMY ENGINEER DISTRICT, FORT WORTH

ATTN: CESWF-CT

819 TAYLOR ST, ROOM 2A19

P.O. BOX 17300

FORT WORTH TX 76102-0300

W9126G 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODE CODE

EMAIL: TEL:

W9126G-13-R-0010

SECTION SF 30 BLOCK 14 CONTINUATION PAGE

SUMMARY OF CHANGES

1. The following Specifications have been added:

TEMF

33 11 29 – LIME-STABILIZED SUBGRADE

COF

33 11 29 – LIME-STABILIZED SUBGRADE

End of Summary of Changes

VMF TEMF FY12 PN 05034 FSHVMFTMF

SECTION 32 11 29

LIME-STABILIZED SUBGRADE

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ASTM INTERNATIONAL (ASTM)

ASTM C136 (2006) Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates

ASTM C1602/C1602M (2012) Standard Specification for Mixing Water Used in Production of Hydraulic Cement Concrete

ASTM C25 (2011) Standard Test Method for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime

ASTM C50 (2012) Sampling, Sample Preparation, Packaging, and Marking of Lime and Limestone Products

ASTM D1556 (2007) Density and Unit Weight of Soil in Place by the Sand-Cone Method

ASTM D1557 (2012) Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-lbf/ft3) (2700 kN-m/m3)

ASTM D1632 (2007) Making and Curing Soil-Cement Compression and Flexure Test Specimens in the Laboratory

ASTM D422 (1963; R 2007) Particle-Size Analysis of Soils

ASTM D4318 (2010) Liquid Limit, Plastic Limit, and Plasticity Index of Soils

ASTM D75/D75M (2009) Standard Practice for Sampling Aggregates

ASTM E11 (2009e1) Wire Cloth and Sieves for Testing Purposes

SECTION 32 11 29 Page 1

W9126G-13-R-0010, Amendment No. 0006

1.2 DEFINITIONS

1.2.1 Lime-Stabilized Course

Lime-stabilized course, as used in this specification, is a mixture of lime and in-place or borrow material uniformly blended, wetted, and thoroughly compacted to produce a pavement course which meets the criteria set forth in the plans and this specification.

1.2.2 Degree of Compaction

Degree of compaction required is expressed as a percentage of the maximum density obtained by the test procedure presented in ASTM D1557abbreviated as percent laboratory maximum density.

1.3 SYSTEM DESCRIPTION

The work specified consists of the construction of a lime-stabilized subgrade course. Perform the work in accordance with this specification conforming to the lines, grades, notes, and typical sections shown in the drawings. Select sources of materials well in advance of the time when materials will be required in the work.

1.3.1 Stockpiling Materials

Stockpile borrow material, including approved material available from excavation and grading, in the manner and at the locations designated.

Before stockpiling material, storage sites shall be cleared and sloped to drain. Stockpile separately materials obtained from different sources.

1.3.2 Plant, Equipment, Machines, and Tools

Submit list of proposed equipment to be used in performance of construction work including descriptive data.

1.3.2.1 General Requisites

Plant, equipment, machines, and tools used in the work shall be subject to approval and maintained in satisfactory working condition at all times.

Other compacting equipment may be used in lieu of that specified, where it can be demonstrated that the results are equivalent. Provide protective equipment, apparel, and barriers to protect the eyes, respiratory system, and the skin of workers exposed to contact with lime dust or slurry.

1.3.2.2 Steel-Wheeled Rollers

Steel wheeled rollers shall be the self propelled type. Unless otherwise provided, non-vibratory steel-wheel rollers shall be of the tandem or 3-wheel self-propelled type or steel-wheel trailer type weighing not less than 5 tons. When drive rolls or trailer type rolls produce a compressive force of not less than 200 pounds per linear inch of contact area, a roller weighing less than 5 tons may be used. Equip wheels of the rollers with adjustable scrapers. The use of vibratory rollers is optional.

1.3.2.3 Pneumatic-Tired Rollers

Pneumatic-tired rollers shall have 4 or more tires, inflated to a minimum pressure of 90 psi. The loading shall be equally distributed to all wheels, and the tires shall be uniformly inflated. Also provide

SECTION 32 11 29 Page 2 pneumatic-tired towing equipment.

1.3.2.4 Tamping-Type Roller

The tamping type roller, under working conditions, shall have a minimum weight of 90 pounds per linear inch of length of drum and a minimum load on each sheeps-foot of 100 pounds per square inch of cross sectional area of the sheeps-foot in contact with the ground. Maximum area of the face of each sheeps-foot shall not be more than 12 square inches. The feet on the sheeps-foot roller shall project not less than 7 inches from the face of the drum, and the roller shall be equipped with teeth-cleaning devices.

Space the feet in adjacent rows so that the distance from center to center of adjacent parallel rows is not less than 6 inches nor more than 11 inches.

Individual drums of the roller shall not exceed 5 feet in width and shall oscillate independently. Roller and tractor for pulling shall travel at a speed of approximately 3 to 6 mph.

1.3.2.5 Mechanical Spreader

Mechanical spreader shall be self-propelled or attached to a propelling unit capable of moving the spreader and material truck. The device shall be steerable and shall have variable speeds forward and reverse. The spreader and propelling unit shall be carried on tracks, rubber tires, or drum-type steel rollers that will not disturb the underlying material.

Provide a spreader containing a hopper, an adjustable screed, and outboard bumper rolls; designed to have a uniform, steady flow of material from the hopper; and capable of laying material without segregation, across the full width of the lane, to a uniform thickness and to a uniform loose density so that when compacted, the layer or layers conform to thickness and grade requirements indicated. The Contracting Officer may require a demonstration of the spreader prior to approving use in performance of the work.

1.3.2.6 Pulvimixer

The pulverizing and mixing equipment shall be self-propelled, four-wheel drive, and capable of pulverizing the soil in a single pass for the full depth to be stabilized. The mixing action shall be capable of uniformly blending and mixing the required lime content with the subgrade soil. The rotor shall be capable of up or down cutting.

1.3.2.7 Slurry Mixer/Distributor

Mix the lime with water in trucks with approved distributors and applied as a thin water suspension or slurry. Apply commercial lime slurry with a lime percentage not less than that applicable for the grade used. Attain the distribution of lime by successive passes over a measured section of subgrade until the proper amount of lime has been spread. The amount of lime spread shall be the amount required for mixing to the specified depth that will result in the percentage determined in the job mix formula. The distributor truck shall continually agitate the slurry to keep the mixture uniform.

1.3.2.8 Central Mixing Plant

A lime-slurry central mixing plant shall consist of a lime storage silo, water supply tank, lime and water metering devices, and a lime-water mixer.

Provide storage tanks for lime-water slurry with mechanical agitation to maintain the lime-water slurry in suspension.

SECTION 32 11 29 Page 3

1.3.2.9 Sprinkling Equipment

Provide sprinkling equipment consisting of tank trucks, pressure distributors, or other approved equipment designed to apply controlled quantities of water uniformly over variable widths of surface.

1.3.2.10 Tampers

Provide tampers of an approved mechanical type, having sufficient weight and striking power to produce the compaction required.

1.3.2.11 Straightedge

Furnish and maintain at the site, in good condition, one 12 foot straightedge for use in the testing of the finished surface. Straightedge shall be made available for Government use. Straightedges shall be constructed of aluminum or other lightweight metal with blades of box or box-girder cross section with flat bottom reinforced to insure rigidity and accuracy. Straightedges shall have handles to facilitate movement on pavement.

1.4 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-03 Product Data

Plant, Equipment, Machines, and Tools; G-AO Mix Design; G-AO

SD-06 Test Reports

Sampling and Testing Field Density

SD-07 Certificates

Bituminous Material.

Lime Laboratory

1.5 ENVIRONMENTAL REQUIREMENTS

Do not work during freezing temperatures. When the temperature is below 40 degrees F, protect the completed stabilized materials against freezing by a sufficient covering of straw, or by other approved methods, until the course has dried out. Any areas of completed stabilized] materials that are damaged by freezing, rainfall, or other weather conditions shall be brought to a satisfactory condition without additional cost to the Government. Do not apply lime when the atmospheric temperature is less than 40 degrees F or to soils that are frozen or contain frost, or when the underlying material is frozen. If the temperature falls below 35 degrees F completed lime-treated areas shall be protected against any detrimental

SECTION 32 11 29 Page 4 effects of freezing.

PART 2 PRODUCTS

2.1 MATERIALS

2.1.1 Lime

Lime shall be as defined in Item 260 of the Texas Department of Transportation (TXDOT) Standard Specifications for Construction and Maintenance of Highways, Streets, and Bridges.

2.1.2 Bituminous Material

Material shall conform to the requirements of Item 260 of the TXDOT Standard Specification.2.1.3 Material to beStabilized

Material to be stabilized shall consist of in situ, borrow, or compacted fill material. Provide material free of deleterious substances such as sticks, debris, organic matter, and stones greater than 3 inches in any dimension. At least 10 percent of the material shall pass the No. 40 sieve.

2.1.4 Water

Water shall be clean, fresh, and free from injurious amounts of oil, acid, salt, alkali, organic matter, and other substances deleterious to the lime or soil-lime mixture, and shall be subject to approval. Water shall be tested and conform to the requirements of ASTM C1602/C1602M including the optional requirements of Table 2. Potable water sources may be used without testing.

2.2 MIX DESIGN

The mix design shall be in accordance with Item 260 of the TXDOT Standard Specifications and submitted by the Contractor to the Government. The in situ soil or compacted fill shall be modified with lime at a rate of 6 percent per dry unit weight of soil.]

PART 3 EXECUTION

3.1 LIME STABILIZATION MIXTURE

The subgrade material to be stabilized shall be thoroughly pulverized and, when lime is applied in the dry state, the mix shall be thoroughly blended at a moisture content below optimum. After blending is completed, the proportions of the mixture shall be in accordance with the approved mix design. After blending, water shall be added into the dry mix in amounts necessary to bring the moisture content to a minimum of 3 percent above optimum. Control field moisture content within plus 2 or minus 1 percent of optimum. When the stabilized course is constructed in more than one layer, clean the previously constructed layer of loose and foreign matter by sweeping with power sweeper or power brooms, except that hand brooms may be used in areas where power cleaning is not practicable. Provide adequate drainage during the entire construction period to prevent water from collecting or standing on the area to be stabilized or on pulverized, mixed, or partially mixed material. Provide line and grade stakes as

SECTION 32 11 29 Page 5 necessary for control. Place grade stakes in lines parallel to the centerline of the area under construction and suitably spaced for string lining.

3.2 PREPARATION OF AREA TO BE STABILIZED

Clean the area of debris, roots, thrash, organic and other deleterious materials. The area will be inspected for adequate compaction and shall be capable of withstanding, without displacement, the compaction specified for the soil-lime mixture. Debris and removed unsatisfactory in-place material shall be disposed of as specified.

3.2.1 In-Place Material to be Stabilized

Grade the entire area to conform to the lines, grades, and cross sections shown in the drawings prior to being processed. Soft or yielding subgrade areas shall be made stable before construction is begun. Unsatisfactory material shall be removed and replaced as directed by the Government.

3.2.2 In-Place Material to Receive Stabilized Course

Correct soft, yielding areas and ruts or other irregularities in the surface. The material in the affected areas shall be loosened and unsatisfactory material removed. Add approved material where directed.

The area shall then be shaped to line, grade, and cross section, and shall be compacted to the specified density. Subgrade shall conform to Section

31 00 00 EARTHWORK.

3.2.3 Grade Control

Excavate underlying material to sufficient depth for the required stabilized -course thickness so that the finished stabilized course with the subsequent surface course will meet the fixed grade. Finished and completed stabilized area shall conform to the lines, grades, cross section, and dimensions indicated.

3.3 INSTALLATION

3.3.1 Mixed In-Place Method

3.3.1.1 Scarifying and Pulverizing of Soil

Prior to application of lime, the soil shall be scarified and pulverized to the depth shown. Scarification shall be controlled so that the layer beneath the layer to be treated is not disturbed. Depth of pulverizing shall not exceed the depth of scarification.

3.3.1.2 Application of Lime

Shape pulverized material to approximately the cross section indicated.

Apply lime so that when uniformly mixed with the soil, the specified lime content is obtained, and a sufficient quantity of lime-treated soil is produced to construct a compacted lime-treated course conforming to the lines, grades, and cross section indicated. Lime shall be spread only on areas where the mixing operations can be completed during the same work shift or day. If lime is spread by hand, the bags shall be spotted accurately on the area being stabilized so that when the bags are opened the lime will be dumped and spread uniformly on the area being processed.

Limit hand spreading to areas inaccessible to mechanical spreaders. No

SECTION 32 11 29 Page 6 equipment, except that used in spreading and mixing, shall pass over the freshly applied lime.

3.3.1.3 Initial Mixing

Mix the lime and soil immediately after the lime has been distributed.

Initial mixing shall be sufficient to alleviate any dusting or wetting of the lime that might occur in the event of wind or rainstorms. This may be accomplished several days in advance of the final application and mixing.

3.3.1.4 Water Application and Moist Mixing

Determine moisture content of the mixture in preparation for final mixing.

Moisture in the mixture following final mixing shall not be less than the water content determined to be optimum based on dry weight of soil and shall not exceed the optimum water content by more than 2 percentage points. Water may be added in increments as large as the equipment will permit; however, such increment of water shall be partially incorporated in the mix to avoid concentration of water near the surface. After the last increment of water has been added, continue mixing until the water is uniformly distributed throughout the full depth of the mixture, including satisfactory moisture distribution along the edges of the section. Soil shall be mixed in two stages, allowing for an intervening 24 to 48 hour mellowing period. The stabilized mixture should mellow sufficiently to allow the chemical reaction to alter (break down) the material. The duration of this mellowing period shall be identified in the mix design and should be based on soil type. After mellowing, the soil shall be remixed before compaction.

3.3.1.5 Confined Areas

In areas inaccessible to machinery, excavate soils to be stabilized and move to an area where machine mixing may be performed, processed, and placed back in the original location. Place material in its final location within 24 hours of initial mixing, and prior to final mixing and compaction.

3.3.2 Edges of Stabilized Course

Place approved material along the edges of the stabilized course in a quantity that will compact to the thickness of the course being constructed, or to the thickness of each layer in a multiple-layer course, allowing at least a 1 foot width of the shoulder to be rolled and compacted simultaneously with the rolling and compacting of each layer of the stabilized course.

3.3.3 Central-Plant Method

Provide a plant capable of producing a uniform lime-treated mixture at the specified lime and moisture contents. Haul the mixture to the job in trucks equipped with protective covers. Underlying course shall be thoroughly moistened and the mixture then placed on the prepared area in a uniform layer with mechanical spreaders. The layer shall be uniform in thickness and surface contour; and the completed layer, after compaction, shall conform to the required grade and cross section.

3.3.4 Traveling-Plant Method

Traveling plant shall move at a uniform rate of speed and shall accomplish thorough mixing of the materials in one pass. Deliver water and lime from

SECTION 32 11 29 Page 7 supply trucks or bins at a predetermined rate. Windrows of prepared soil-lime mixture shall cover a predetermined width to the indicated compacted thickness.

3.3.5 Layer Thickness

Compacted thickness of the stabilized course shall be as indicated.

3.3.6 Compaction

Before compaction operations are started and as a continuation of the mixing operation, the mixture shall be thoroughly loosened and pulverized to the full depth. Start compaction immediately after final mixing is completed. During final compaction moisten the surface, if necessary, and shape it to the required lines, grades, and cross section. Density of compacted mixture shall be at least 95 percent of laboratory maximum density. Begin rolling at the outside edge of the surface and proceed to the center, overlapping on successive trips at least one-half the width of the roller. Make alternate trips of the roller slightly different lengths. At all times, the speed of the roller shall not cause displacement of the mixture to occur. Compact areas inaccessible to the rollers with mechanical tampers; shape and finish the areas by hand methods.

3.3.7 Finishing

Finish the surface of the top layer to the grade and cross section shown.

The surface shall be of uniform texture. Light blading during rolling may be necessary for the finished surface to conform to the lines, grades, and cross sections. If for any reason the surface becomes rough, corrugated, uneven in texture, or traffic-marked prior to completion, the unsatisfactory portions shall be scarified, reworked, relaid, or replaced as directed. If any portion of the course, when laid, becomes watersoaked for any reason, that portion shall be removed immediately, and the mix placed in a windrow and aerated until a moisture content within the limits specified is obtained; and then spread, shaped, and rolled as specified above.

3.3.8 Construction Joints

At the end of each phase of construction, form a straight transverse construction joint by cutting back into the completed work to form a true vertical face free of loose or shattered material. Material along construction joints not properly compacted shall be removed and replaced with soil-lime mixture that is mixed, moistened, and compacted as specified.

3.3.9 Curing and Protection

Immediately after the soil-lime area has been finished as specified above, the surface shall be protected against rapid drying for 7 days by the application of a bituminous material.

3.4 SAMPLING AND TESTING

Submit calibration curves and related test results prior to using the device or equipment being calibrated. Furnish copies of field test results within 24 hours after the tests are performed. Submit certified copies of test results of materials and sources not less than 30days before material is required for the work.

SECTION 32 11 29 Page 8

3.4.1 General Requirements

Perform sampling and testing using an approved commercial testing laboratory or facilities furnished by the Contractor. Work requiring testing will not be permitted until the facilities have been inspected and approved. The first inspection will be at the expense of the Contractor.

Cost incurred for any subsequent inspection required because of failure of the facilities to pass the first inspection will be charged to the Contractor. Perform tests in sufficient numbers and at the locations and times directed to ensure that materials and compaction meet specified requirements. Furnish certified copies of the test results to the Contracting Officer within 24 hours of completion.

3.4.2 Results

Results shall verify that the material complies with the specification.

When the source of materials is changed or deficiencies are found, repeat the initial analysis including mix design studies if the material source is changed, and retest the material already placed to determine the extent of unacceptable material. Replace all in-place unacceptable material.

3.4.3 Sampling

Take all aggregate samples for laboratory testing in accordance with ASTM D75/D75M. Take samples of lime in accordance with ASTM C50. Prepare specimens for the unconfined compression tests in accordance with ASTM D1632.

3.4.4 Sieve Analysis

Before starting work, test one sample of material to be stabilized in accordance with ASTM C136 and ASTM D422 on sieves conforming to ASTM E11.

After the initial test, perform a minimum of one analysis for each 1000 tons of material placed, with a minimum of one analysis for each day's run until the course is completed.

3.4.5 Liquid Limit and Plasticity Index

Perform one liquid limit and plasticity index for each sieve analysis.

Liquid limit and plasticity index shall be in accordance with ASTM D4318.

3.4.6 Chemical Analysis

Test lime for the specified chemical requirements in accordance with

ASTM C25.

3.5 FIELD QUALITY CONTROL

Provide a moisture-density relationship for the lime-soil mixture from the tests. Results of field quality control testing shall verify that materials comply with this specification. When a material source is changed, test the new material for compliance. When deficiencies are found, the initial analysis shall be repeated and the material already placed shall be retested to determine the extent of unacceptable material.

All in-place unacceptable material shall be replaced or repaired, as directed by the Contracting Officer, at no additional cost to the Government.

SECTION 32 11 29 Page 9

3.5.1 Treatment Depth Checks

The depth of stabilization shall be measured at a frequency intervals for each 600 square yards of stabilized course. Measurements shall be made in test holes soil by spraying with a pH indicator such as phenolphthalein.

Phenolphthalein changes from clear to red between pH 8.3 and 10. The color change indicates the location of the bottom of the mixing zone. Other pH indicators can measure higher pH levels if there is reason to suspect that inadequate lime has been mixed into the soil.

3.5.2 Thickness Control

Completed thicknesses of the stabilized course shall be within 3/8 inch of the thickness indicated. Where the measured thickness of the stabilized course is more than 3/8 inch deficient, correct such areas by scarifying, adding mixture of proper gradation, reblading, and recompacting as directed. Where the measured thickness of the stabilized course is more than 3/8 inch thicker than indicated, it shall be considered as conforming to the specified thickness requirement. Average job thickness shall be the average of all thickness measurements taken for the job, but shall be within 1/4 inch of the thickness indicated. Thickness of the stabilized course shall be measured at intervals which ensure one measurement for each 600 square yards of stabilized course. Measurements shall be made in 3 inch diameter test holes penetrating the stabilized course.

3.5.3 Field Density

Determine field in-place density in accordance with ASTM D1556 ASTM D2922.

In-place densities shall be checked by ASTM D1556 at least once per lift and at a frequency not to exceed one test under ASTM D1556 per 3000 square yards of completed subgrade.

3.5.4 Smoothness Test

The surface of a stabilized layer shall show no deviations in excess of 1/2 inch when tested with the 10- foot straightedge. Deviations exceeding this amount shall be corrected by removing material and replacing with new material, or by reworking existing material and compacting, as directed.

Take measurements for deviation from grade and cross section shown in successive positions parallel to the pavement centerline with a 10- foot straightedge. Measurements shall also be taken perpendicular to the pavement centerline at 50- foot intervals.

3.6 TRAFFIC

Completed portions of the lime-treated soil area may be opened to light traffic after a period of 3 days if cured with a bituminous material provided the curing is not damaged. After the curing period has elapsed, completed areas may be opened to all traffic, provided the stabilized course has hardened sufficiently to prevent marring or distorting of the surface by equipment or traffic. Heavy equipment is not permitted on the area during the curing period. Protect finished portions of lime-stabilized soil, that are traveled on by equipment used in constructing an adjoining section, in a manner to prevent equipment from marring or damaging completed work.

3.7 MAINTENANCE

Maintain stabilized area in a satisfactory condition until the completed

SECTION 32 11 29 Page 10 work is accepted. Maintenance shall include immediate repairs of any defects and shall be repeated as often as necessary to keep the area intact. Correct defects as specified herein.

3.8 DISPOSAL OF UNSATISFACTORY MATERIALS

Removed in-place materials that are unsuitable for stabilization, material that is removed for the required correction of defective areas, waste material, and debris shall be disposed of as directed .

-- End of Section --

SECTION 32 11 29 Page 11

VMF COF FY12 PN 05034 FSHVMFCOF