Attachment 4.6 UFGS 32 11 20.pdf

USACE / NAVFAC / AFCEC / NASA UFGS- 32 11 20 ( August 2017) Pr epar i ng Act i v i t y: USACE Super sedi ng UFGS- 32 11 16 ( August 2008)

UNI FI ED FACI LI TI ES GUI DE SPECI FI CATI ONS

Ref er ences ar e i n agr eement wi t h UMRL dat ed Januar y 2021

SECTION TABLE OF CONTENTS

DIVISION 32 - EXTERIOR IMPROVEMENTS

SECTION 32 11 20

[BASE COURSE FOR RIGID][ AND ][SUBBASES FOR FLEXIBLE] PAVING

08/17

PART 1 GENERAL

1.1 UNIT PRICES

1.1.1 Measurement

1.1.1.1 Area

1.1.1.2 Volume

1.1.1.3 Weight

1.1.2 Payment

1.1.2.1 Course Material

1.1.2.2 Stabilization

1.1.3 Waybills and Delivery Tickets

1.2 REFERENCES

1.3 DEGREE OF COMPACTION

1.4 SUBMITTALS

1.5 EQUIPMENT, TOOLS, AND MACHINES

1.6 QUALITY ASSURANCE

1.6.1 Sampling

1.6.2 Tests

1.6.2.1 Sieve Analysis

1.6.2.2 Liquid Limit and Plasticity Index

1.6.2.3 Moisture-Density Determinations

1.6.2.4 Field Density Tests

1.6.2.5 Wear Test

1.6.2.6 Weight of Slag

1.7 ENVIRONMENTAL REQUIREMENTS

PART 2 PRODUCTS

2.1 MATERIALS

2.1.1 Subbase Course

2.1.2 Select-Material Subbase Course

2.1.3 Rigid Pavement Base Course

2.2 TESTS, INSPECTIONS, AND VERIFICATIONS

2.2.1 Initial Tests

2.2.2 Approval of Material

SECTION 32 11 20 Page 1

PART 3 EXECUTION

3.1 GENERAL REQUIREMENTS

3.2 OPERATION OF AGGREGATE SOURCES

3.3 STOCKPILING MATERIAL

3.4 PREPARATION OF UNDERLYING COURSE OR SUBGRADE

3.5 GRADE CONTROL

3.6 MIXING AND PLACING MATERIALS

3.7 LAYER THICKNESS

3.8 COMPACTION

3.9 PROOF ROLLING

3.10 EDGES OF [SUBBASE] [AND] [SELECT-MATERIAL SUBBASE] [RIGID

PAVEMENT BASE COURSE]

3.11 FINISHING

3.12 SMOOTHNESS TEST

3.13 FIELD QUALITY CONTROL

3.13.1 In-Place Tests

3.13.2 Approval of Material

3.14 TRAFFIC

3.15 MAINTENANCE

3.16 DISPOSAL OF UNSATISFACTORY MATERIALS

-- End of Section Table of Contents --

SECTION 32 11 20 Page 2

USACE / NAVFAC / AFCEC / NASA UFGS- 32 11 20 ( August 2017) Pr epar i ng Act i v i t y: USACE Super sedi ng UFGS- 32 11 16 ( August 2008)

UNI FI ED FACI LI TI ES GUI DE SPECI FI CATI ONS

Ref er ences ar e i n agr eement wi t h UMRL dat ed Januar y 2021

SECTION 32 11 20

[BASE COURSE FOR RIGID][ AND ][SUBBASES FOR FLEXIBLE] PAVING

08/17

NOTE: Thi s gui de speci f i cat i on cover s t he r equi r ement s f or subbase, sel ect - mat er i al subbase and r i gi d base cour ses f or ai r f i el d pavement s, r oads and st r eet s.

Adher e t o UFC 1-300-02 Uni f i ed Faci l i t i es Gui de Speci f i cat i ons ( UFGS) For mat St andar d when edi t i ng t hi s gui de speci f i cat i on or pr epar i ng new pr oj ect speci f i cat i on sect i ons. Edi t t hi s gui de speci f i cat i on f or pr oj ect speci f i c r equi r ement s by addi ng, del et i ng, or r evi s i ng t ext . For br acket ed i t ems, choose appl i cabl e i t em( s) or i nser t appr opr i at e i nf or mat i on.

Remove i nf or mat i on and r equi r ement s not r equi r ed i n r espect i ve pr oj ect , whet her or not br acket s ar e present.

Comment s, suggest i ons and r ecommended changes f or t hi s gui de speci f i cat i on ar e wel come and shoul d be submi t t ed as a Criteria Change Request (CCR) .

PART 1 GENERAL

NOTE: Thi s gui de speci f i cat i on i s appl i cabl e t o subbase cour ses f or ai r f i el d pavement s, r oads and st r eet s i ncl udi ng sel ect - mat er i al subbase cour ses i n t he l ower l evel s of t he pavement st r uct ur e. Thi s speci f i cat i on wi l l be used f or any subbase cour se t hat has a desi gn Cal i f or ni a bear i ng r at i o ( CBR) bet ween 20 and 50 or any sel ect - mat er i al wi t h desi gn CBR l ess t han 20. Sel ect mat er i al subbase wi l l not r equi r e pr ocessi ng or bl endi ng.

Thi s speci f i cat i on may al so be used f or :

a. The base cour se di r ect l y beneat h t he bi t umi nous

SECTION 32 11 20 Page 3 sur f ace of a pavement desi gn f or r oads and st r eet s wher e t he r equi r ed CBR val ue of t he mat er i al i s 50 or mor e and t he mat er i al conf or ms t o Gr adat i on No. 1.

b. The base cour se beneat h r i gi d pavement s.

When t hi s gui de speci f i cat i on i s used f or aggr egat e base cour se under r i gi d pavement , sect i on t i t l e of t he pr oj ect speci f i cat i on wi l l be: BASE COURSE FOR RI GI D PAVI NG and t he wor ds " r i gi d pavement base cour se" sel ect ed t hr oughout . When t hi s gui de speci f i cat i on i s used i n combi nat i on f or a subbase cour se under f l exi bl e pavement s and a base cour se under r i gi d pavement s, t he sect i on t i t l e wi l l be:

BASE COURSE FOR RI GI D AND SUBBASES FOR FLEXI BLE

PAVI NG and t he wor ds " or r i gi d pavement base cour se" wi l l be i ncl uded af t er " subbase" t hr oughout .

1.1 UNIT PRICES

NOTE: Del et e uni t pr i ce par agr aphs when t he wor k i s cover ed by a l ump- sum cont r act pr i ce.

1.1.1 Measurement

NOTE: Del et e t he met hod of measur ement par agr aph not appl i cabl e t o j ob condi t i ons. The pr ovi s i on f or st ockpi l i ng wi l l be r et ai ned or del et ed as applicable.

1.1.1.1 Area

Measure the quantity of [_____] mm inch thick [subbase] [and] [select-material subbase] [or] [rigid pavement base] course completed and accepted, as determined by the Contracting Officer, in square meters yards .

1.1.1.2 Volume

Measure the quantity of [subbase] [and] [select-material subbase] [or] [rigid pavement base] course completed and accepted, as determined by the Contracting Officer, in cubic meters yards . The volume of material in-place and accepted will be determined by the average job thickness obtained in accordance with paragraph LAYER THICKNESS and the dimensions shown on the drawings.

1.1.1.3 Weight

The tonnage of [subbase] [and] [select-material subbase] [or] [rigid pavement base] course material will be the number of metric tons tons of aggregate, [placed and accepted in the completed course] [plus the amount] [placed in authorized stockpiles] as determined by the Contracting Officer. Deductions will be made for any material wasted, unused, rejected, or used for convenience of the Contractor, and for water exceeding specified amount at time of weighing.

SECTION 32 11 20 Page 4

1.1.2 Payment

1.1.2.1 Course Material

Quantities of [subbase] [and] [select-material subbase] [or] [rigid pavement base] course, determined as specified above, will be paid for at the respective contract unit prices, which will constitute full compensation for the construction and completion of the [subbase] [and] [select-material subbase] [or] [rigid pavement base] course.

1.1.2.2 Stabilization

Cohesionless subgrade or select subbase courses to be stabilized, as specified in paragraph PREPARATION OF UNDERLYING COURSE OR SUBGRADE, will be paid for as a special item on a tonnage basis including extra manipulation as required.

1.1.3 Waybills and Delivery Tickets

Submit copies of waybills and delivery tickets during progress of the work. Before the final payment is allowed, file certified waybills and certified delivery tickets for all aggregates actually used.

1.2 REFERENCES

NOTE: Thi s par agr aph i s used t o l i s t t he publ i cat i ons c i t ed i n t he t ext of t he gui de speci f i cat i on. The publ i cat i ons ar e r ef er r ed t o i n t he t ext by basi c desi gnat i on onl y and l i s t ed i n t hi s par agr aph by or gani zat i on, desi gnat i on, dat e, and t i t l e.

Use t he Ref er ence Wi zar d' s Check Ref er ence f eat ur e when you add a RI D out si de of t he Sect i on' s Ref er ence Ar t i c l e t o aut omat i cal l y pl ace t he r ef er ence i n t he Ref er ence Ar t i c l e. Al so use t he Ref er ence Wi zar d' s Check Ref er ence f eat ur e t o updat e t he i ssue dat es.

Ref er ences not used i n t he t ext wi l l aut omat i cal l y be del et ed f r om t hi s sect i on of t he pr oj ect speci f i cat i on when you choose t o r econci l e r ef er ences i n t he publ i sh pr i nt pr ocess.

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.

AMERICAN ASSOCIATION OF STATE HIGHWAY AND TRANSPORTATION OFFICIALS

(AASHTO)

AASHTO T 88 (2013) Standard Method of Test for Particle Size Analysis of Soils

AASHTO T 180 (2017) Standard Method of Test for Moisture-Density Relations of Soils Using

SECTION 32 11 20 Page 5 a 4.54-kg (10-lb) Rammer and a 457-mm (18-in.) Drop

AASHTO T 224 (2010) Standard Method of Test for Correction for Coarse Particles in the Soil Compaction Test

ASTM INTERNATIONAL (ASTM)

ASTM C29/C29M (2017a) Standard Test Method for Bulk Density ("Unit Weight") and Voids in Aggregate

ASTM C117 (2017) Standard Test Method for Materials Finer than 75-um (No. 200) Sieve in Mineral Aggregates by Washing

ASTM C131/C131M (2020) Standard Test Method for Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine

ASTM C136/C136M (2019) Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates

ASTM D75/D75M (2019) Standard Practice for Sampling Aggregates

ASTM D1556/D1556M (2015; E 2016) Standard Test Method for Density and Unit Weight of Soil in Place by Sand-Cone Method

ASTM D1557 (2012; E 2015) Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-lbf/ft3) (2700 kN-m/m3)

ASTM D2167 (2015) Density and Unit Weight of Soil in Place by the Rubber Balloon Method

ASTM D2487 (2017; E 2020) Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System)

ASTM D4318 (2017; E 2018) Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils

ASTM D6938 (2017a) Standard Test Method for In-Place Density and Water Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth)

ASTM E11 (2020) Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves

SECTION 32 11 20 Page 6

1.3 DEGREE OF COMPACTION

Degree of compaction required, except as noted in the second sentence, is expressed as a percentage of the maximum laboratory dry density obtained by the test procedure presented in ASTM D1557 abbreviated as a percent of laboratory maximum dry density. Since ASTM D1557 applies only to soils that have 30 percent or less by weight of their particles retained on the

9.0 mm 3/4 inch sieve, the degree of compaction for material having more than 30 percent by weight of their particles retained on the 9.0 mm 3/4 inch sieve will be expressed as a percentage of the laboratory maximum dry density in accordance with AASHTO T 180 Method D and corrected with

AASHTO T 224 .

1.4 SUBMITTALS

NOTE: Revi ew submi t t al descr i pt i on ( SD) def i ni t i ons i n Sect i on 01 33 00 SUBMI TTAL PROCEDURES and edi t t he f ol l owi ng l i s t , and cor r espondi ng submi t t al i t ems i n t he t ext , t o r ef l ect onl y t he submi t t al s r equi r ed f or t he pr oj ect . The Gui de Speci f i cat i on t echni cal edi t or s have cl assi f i ed t hose i t ems t hat r equi r e Gover nment appr oval , due t o t hei r compl exi t y or cr i t i cal i t y, wi t h a " G. " Gener al l y, ot her submi t t al i t ems can be r evi ewed by t he Cont r act or ' s Qual i t y Cont r ol Syst em. Onl y add a “ G” t o an i t em, i f t he submi t t al i s suf f i c i ent l y i mpor t ant or compl ex i n cont ext of t he pr oj ect .

For Ar my pr oj ect s, f i l l i n t he empt y br acket s f ol l owi ng t he " G" c l assi f i cat i on, wi t h a code of up t o t hr ee char act er s t o i ndi cat e t he appr ovi ng aut hor i t y. Codes f or Ar my pr oj ect s usi ng t he Resi dent Management Syst em ( RMS) ar e: " AE" f or Ar chi t ect - Engi neer ; " DO" f or Di st r i ct Of f i ce ( Engi neer i ng Di v i s i on or ot her or gani zat i on i n t he Di st r i ct Of f i ce) ; " AO" f or Ar ea Of f i ce; " RO" f or Resi dent Of f i ce; and " PO" f or Pr oj ect Of f i ce. Codes f ol l owi ng t he " G" t ypi cal l y ar e not used f or Navy, Ai r For ce, and NASA pr oj ect s.

The " S" c l assi f i cat i on i ndi cat es submi t t al s r equi r ed as pr oof of compl i ance f or sust ai nabi l i t y Gui di ng Pr i nci pl es Val i dat i on or Thi r d Par t y Cer t i f i cat i on and as descr i bed i n Sect i on 01 33 00 SUBMI TTAL

PROCEDURES.

Choose t he f i r st br acket ed i t em f or Navy, Ai r For ce and NASA pr oj ect s, or choose t he second br acket ed i t em f or Ar my pr oj ect s.

Government approval is required for submittals with a "G" or "S" classification. Submittals not having a "G" or "S" classification are [for Contractor Quality Control approval.][for information only. When used, a code following the "G" classification identifies the office that will review the submittal for the Government.] Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SECTION 32 11 20 Page 7

SD-03 Product Data

Plant, Equipment, and Tools ; G[, [_____] ]

Waybills and Delivery Tickets

SD-06 Test Reports

Initial Tests ; G[, [_____] ]

In-Place Tests ; G[, [_____] ]

1.5 EQUIPMENT, TOOLS, AND MACHINES

NOTE: I f desi r abl e, r equi r ement s f or t ypes of equi pment appl i cabl e t o met hods of const r uct i on based on l ocal condi t i ons wi l l be i ncl uded.

All plant, equipment, and tools used in the performance of the work will be subject to approval by the Contracting Officer before the work is started. Maintain all plant, equipment, and tools in satisfactory working condition at all times. Submit a list of proposed equipment, including descriptive data. Use equipment capable of minimizing segregation, producing the required compaction, meeting grade controls, thickness control, and smoothness requirements as set forth herein.

1.6 QUALITY ASSURANCE

Sampling and testing are the responsibility of the Contractor. Perform sampling and testing using a laboratory approved in accordance with Section 01 45 00.00 10 01 45 00.00 20 01 45 00.00 40 QUALITY CONTROL. Work requiring testing will not be permitted until the testing laboratory has been inspected and approved. Test the materials to establish compliance with the specified requirements and perform testing at the specified frequency. The Contracting Officer may specify the time and location of the tests. Furnish copies of test results to the Contracting Officer within 24 hours of completion of the tests.

1.6.1 Sampling

Take samples for laboratory testing in conformance with ASTM D75/D75M.

When deemed necessary, the sampling will be observed by the Contracting Officer.

1.6.2 Tests

1.6.2.1 Sieve Analysis

NOTE: Test i ng i n accor dance wi t h AASHTO T 88 wi l l be r equi r ed when t he mat er i al s need t o be t est ed f or t he 0. 02 mm par t i c l e s i ze.

Perform sieve analysis in conformance with ASTM C117 and ASTM C136/C136M using sieves conforming to ASTM E11. [Perform particle-size analysis of the soils in conformance with AASHTO T 88 .]

SECTION 32 11 20 Page 8

1.6.2.2 Liquid Limit and Plasticity Index

Determine liquid limit and plasticity index in accordance with ASTM D4318.

1.6.2.3 Moisture-Density Determinations

Determine the laboratory maximum dry density and optimum moisture in accordance with paragraph DEGREE OF COMPACTION.

1.6.2.4 Field Density Tests

Measure field density in accordance with ASTM D1556/D1556M , ASTM D2167, or ASTM D6938. For the method presented in ASTM D1556/D1556M , use the base plate, as shown in the drawing. For the method presented in ASTM D6938, check the calibration curves and adjust them, if necessary, using only the sand cone method as described in paragraph Calibration, of the ASTM publication. Tests performed in accordance with ASTM D6938 result in a wet unit weight of soil and ASTM D6938 will be used to determine the moisture content of the soil. Also check the calibration curves furnished with the moisture gauges along with density calibration checks as described in ASTM D6938. Make the calibration checks of both the density and moisture gauges using the prepared containers of material method, as described in paragraph Calibration, in ASTM D6938, on each different type of material to be tested at the beginning of a job and at intervals as directed. Submit calibration curves and related test results prior to using the device or equipment being calibrated.

1.6.2.5 Wear Test

NOTE: Wear t est s ar e not r equi r ed f or sel ect - mat er i al subbase cour se mat er i al s.

Perform wear tests on [subbase course] [and] [or] [rigid pavement base course] material in conformance with ASTM C131/C131M.

1.6.2.6 Weight of Slag

NOTE: Thi s par agr aph wi l l be omi t t ed when i t i s hi ghl y unl i kel y t hat s l ag wi l l be suppl i ed.

Determine weight per cubic meter foot of slag in accordance with

ASTM C29/C29M.

1.7 ENVIRONMENTAL REQUIREMENTS

NOTE: Thi s par agr aph may be del et ed i n l ocal i t i es wher e f r eezi ng t emper at ur es do not occur , and

SECTION 32 11 20 Page 9 el sewher e when i t i s def i ni t el y known t hat t he wor k wi l l not be car r i ed on dur i ng per i ods when such t emper at ur es ar e t o be expect ed. Ot her wi se, t hi s r equi r ement wi l l be r et ai ned, but t he pr ot ect i ve measur es speci f i ed may be modi f i ed t o sui t l ocal condi t i ons and i ndi v i dual pr oj ect r equi r ement s.

Perform construction when the atmospheric temperature is above 2 degrees C 35 degrees F . When the temperature falls below 2 degrees C 35 degrees F , protect all completed areas by approved methods against detrimental effects of freezing. Correct completed areas damaged by freezing, rainfall, or other weather conditions to meet specified requirements.

PART 2 PRODUCTS

2.1 MATERIALS

2.1.1 Subbase Course

NOTE: As wr i t t en, t hi s par agr aph appl i es t o gener al condi t i ons. Ot her mat er i al s such as di s i nt egr at ed gr ani t e, vol cani c ash or c i nder s, l i mer ock, cal i che, or asphal t mi l l i ngs wi l l be speci f i ed when suppor t ed by adequat e per f or mance dat a. The r equi r ement f or per cent age of wear wi l l be del et ed when l ocal exper i ence i ndi cat es t he mat er i al i s sat i sf act or y.

The mat er i al r equi r ement s f r om St at e or ot her l ocal hi ghway agency speci f i cat i ons may be i ncor por at ed i n cont r act document s f or const r uct i ng subbase cour se f or r oads, st r eet s, or s i mi l ar - use pavement s i f condi t i ons a, b, c, and d bel ow ar e met :

a. The per cent age of mat er i al by wei ght passi ng t he

0. 075 mm ( No. 200) s i eve wi l l not exceed 8.

b. When l ocal condi t i ons di ct at e a nonf r ost - suscept i bl e mat er i al , par t i c l es havi ng a di amet er of l ess t han 0. 02 mm wi l l not be i n excess of 3 per cent .

c. The por t i on of t he mat er i al passi ng t he 0. 425 mm ( No. 40) s i eve wi l l have a l i qui d l i mi t not gr eat er t han 25 and a pl ast i c i t y i ndex not gr eat er t han 5.

d. The pr oj ect r equi r es l ess t han 600 cubi c met er s ( 750 cubi c yar ds) of mat er i al and i t i s not an ai r f i el d pavement . ( See i t em e bel ow i f pr oj ect does not meet t hi s r equi r ement ) .

e. Appr oval f r om AFCEC, t he Navy EFDs, or USACE TSMCX i s r equi r ed bef or e st at e or ot her l ocal hi ghway speci f i cat i ons may be used f or r oad or st r eet pr oj ect s r equi r i ng over 600 cubi c met er s ( 750 cubi c yar ds) and/ or ai r f i el d pr oj ect s. Pr oj ect speci f i c i nf or mat i on wi l l be submi t t ed t o AFCEC, t he Navy EFDs, or USACE TSMCX wi t h t he r equest f or approval.

SECTION 32 11 20 Page 10

The desi r ed maxi mum t op si ze wi l l be i nser t ed i n t he bl ank. The necessi t y f or meet i ng gr ades di ct at es t hat maxi mum t op si ze shoul d not exceed 75 mm ( 3 inches).

Gr adat i on No. Desi gn CBR 1 50 Max 2 40 Max 3 30 Max Sel ect Mat er i al 20 Max

Gr adat i on band No. 1 or 2 may be used f or l ower desi gn CBR val ues t han speci f i ed above wher e no i ncr ease i n pr i ce r esul t s. Gr adat i on No. 1 wi l l be used when a dr ai nage l ayer wi l l be pl aced above t he subbase and t he subbase i s desi gned as a separ at i on l ayer . Except i ons t o t he gr adat i on r equi r ement s wi l l be per mi t t ed when suppor t ed by adequat e i n- pl ace CBR dat a. When t hi s speci f i cat i on i s t o be used as base cour se f or r oads, st r eet s, and par ki ng ar eas, t he maxi mum t op si ze wi l l not exceed 50 mm ( 2 i nches) f or a l ayer t hi ckness of l ess t han 150 mm ( 6 i nches) . The i nappl i cabl e gr adat i on wi l l be del et ed.

Wher e l ocal condi t i ons di ct at e a nonf r ost - suscept i bl e mat er i al , r et ai n t he sent ence i n br acket s r equi r i ng par t i c l es havi ng a di amet er of l ess t han 0. 02 mm not t o exceed 3 per cent by wei ght of t he t ot al aggr egat e, as det er mi ned i n accor dance wi t h AASTHO T 88.

Provide aggregates consisting of crushed stone or slag, gravel, shell, sand, or other sound, durable, approved materials processed and blended or naturally combined. Provide aggregates which are free from lumps and balls of clay, organic matter, objectionable coatings, and other foreign material. The percentage of loss of material retained on the 4.75 mm No. 4 sieve must not exceed 50 percent after 500 revolutions when tested in accordance with ASTM C131/C131M. Provide aggregate that is reasonably uniform in density and quality. Provide slag that is an air-cooled, blast-furnace product having a dry weight of not less than 1050 kg/cubic meter 65 pcf . Provide aggregates with a maximum size of [_____] mm inch and within the limits specified as follows:

Maximum Allowable Percentage by Weight Passing Square-Mesh Sieve

Sieve Designation No. 1 No. 2 No. 3

2 mm 50 80 100

0.075 mm 8 8 8

SECTION 32 11 20 Page 11

Maximum Allowable Percentage by Weight Passing Square-Mesh Sieve

Sieve Designation No. 1 No.2 No. 3

No. 10 50 80 100 No. 200 8 8 8

[Particles having diameters less than 0.02 mm must not be in excess of 3 percent by weight of the total sample tested as determined in accordance with AASHTO T 88 .] The portion of any blended component and of the completed course passing the 0.425 mm No. 40 sieve must be either nonplastic or have a liquid limit not greater than 25 and a plasticity index not greater than 5.

2.1.2 Select-Material Subbase Course

NOTE: When used as mat er i al f or embankment , t he appl i cabl e speci f i cat i on wi l l be used t o det er mi ne t he maxi mum si ze of par t i c l es. The r equi r ement on t he amount passi ng t he 0. 075 mm ( No. 200) s i eve may be i ncr eased f or l ocal l y avai l abl e mat er i al s but wi l l not be r el axed t o t he poi nt wher e mat er i al s wi t h i nsuf f i c i ent CBR under ASTM D4429 wi l l pass.

Wher e l ocal condi t i ons di ct at e a nonf r ost - suscept i bl e mat er i al , r et ai n t he sent ence i n br acket s r equi r i ng par t i c l es havi ng a di amet er of l ess t han 0. 02 mm not t o exceed 3 per cent by wei ght of t he t ot al aggr egat e, as det er mi ned i n accor dance wi t hAASHTO T 88.

Provide materials consisting of selected soil or other materials from field excavation, stockpiles, or other sources and free from lumps and balls of clay and from organic and other objectionable matter. Provide materials with not more than 25 percent by weight passing the 0.075 mm No.

200 sieve. The portion of material passing the 0.425 mm No. 40 sieve must have a liquid limit less than 35 and a plasticity index less than 12.

Provide materials having a maximum particle size not exceeding 75 mm 3 inches . [Particles having diameters less than 0.02 mm must not be in excess of 3 percent by weight of the total sample tested as determined in accordance with AASHTO T 88 .]

2.1.3 Rigid Pavement Base Course

NOTE: For ai r f i el ds, r educe t he maxi mum al l owabl e per cent age passi ng t he No. 200 si eve t o 8 and i ncr ease t he maxi mum pl ast i c i t y i ndex t o 8.

Provide aggregates consisting of crushed stone or slag, gravel, shell, sand, or other sound, durable, approved materials processed and blended or naturally combined. Provide aggregates which are durable and sound, free

SECTION 32 11 20 Page 12 from lumps and balls of clay, organic matter, objectionable coatings, and other foreign material. The percentage of loss of material retained on the

4.75 mm No. 4 sieve must not exceed 50 percent after 500 revolutions when tested in accordance with ASTM C131/C131M. At least 50 percent by weight retained on each sieve must have one freshly fractured face with the area at least equal to 75 percent of the smallest midsectional area of the piece. Provide aggregate that is reasonably uniform in density and quality. Provide slag that is an air-cooled, blast-furnace product having a dry weight of not less than 1050 kg/cubic meter 65 pcf . Provide aggregates having a maximum size of 50 mm 2 inches and within the limits specified as follows:

Maximum Allowable Percentage by Weight Passing Square-Mesh Sieve

Sieve Designation Rigid Pavement __________________________________ Base Course 2 mm 85

0.075 mm 15

Maximum Allowable Percentage by Weight Passing Square-Mesh Sieve

Sieve Designation Rigid Pavement ____________________________________ Base Course No. 10 85 No. 200 15

[Particles having diameters less than 0.02 mm must not be in excess of 3 percent by weight of the total sample tested as determined in accordance with AASHTO T 88 .] The portion of any blended component and of the completed course passing the 0.425 mm No. 40 sieve must be either nonplastic or have a liquid limit not greater than 25 and a plasticity index not greater than 6. The Contractor is responsible for any additional stability required to provide a working platform for construction equipment. If the Contractor can demonstrate with a test section that a material has adequate stability to support construction equipment, the fractured face requirement can be deleted, subject to the approval of the Contracting Officer.

2.2 TESTS, INSPECTIONS, AND VERIFICATIONS

2.2.1 Initial Tests

NOTE: The 0. 02 mm si eve anal ysi s r equi r ement s wi l l be i ncl uded when f r ost suscept i bl i t y concer ns exi st .

Perform one of each of the following tests on the proposed material prior to commencing construction to demonstrate that the proposed material meets all specified requirements prior to installation. Complete this testing for each source if materials from more than one source are proposed.

a. Sieve Analysis [including 0.02 mm size material].

b. Liquid limit and plasticity index.

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c. Moisture-density relationship.

d. [Wear.]

e. [Weight per cubic meter foot of Slag.]

f. [_____].

Submit certified copies of test results for approval not less than [30] [_____] days before material is required for the work.

2.2.2 Approval of Material

Tentative approval of material will be based on initial test results.

PART 3 EXECUTION

3.1 GENERAL REQUIREMENTS

Provide adequate drainage during the entire period of construction to prevent water from collecting or standing on the working area.

3.2 OPERATION OF AGGREGATE SOURCES

NOTE: Ret ai n t he f i r st sent ence i n br acket s f or aggr egat e sour ces on pr i vat e l ands. Ret ai n t he second sent ences i n br acket s f or aggegat e sour ces on Gover nment - owned l and.

[Condition aggregate sources on private lands in accordance with local laws and authorities.] [Clearing, stripping and excavating are the responsibility of the Contractor. Condition aggregate sources on Government property to readily drain and leave in a satisfactory condition upon completion of the work.]

3.3 STOCKPILING MATERIAL

Clear and level storage sites prior to stockpiling of material. Stockpile all materials, including approved material available from excavation and grading, in the manner and at the locations designated. Stockpile aggregates on the cleared and leveled areas designated by the Contracting Officer to prevent segregation. Stockpile materials obtained from different sources separately.

3.4 PREPARATION OF UNDERLYING COURSE OR SUBGRADE

Clean the underlying course or subgrade of all foreign substances prior to constructing the [subbase] [or] [select-material subbase] [or] [rigid pavement base] course. Do not construct [subbase] [or] [select-material subbase] [or] [rigid pavement base] course on underlying course or subgrade that is frozen. Construct the surface of the underlying course or subgrade to meet specified compaction and surface tolerances. Correct ruts or soft yielding spots in the underlying courses, areas having inadequate compaction, and deviations of the surface from the specified requirements set forth herein by loosening and removing soft or unsatisfactory material and adding approved material, reshaping to line

SECTION 32 11 20 Page 14 and grade, and recompacting to specified density requirements. For cohesionless underlying courses or subgrades containing sands or gravels, as defined in ASTM D2487, stabilize the surface prior to placement of the overlying course. Stabilize by mixing the overlying course material into the underlying course and compacting by approved methods. Consider the stabilized material as part of the underlying course and meet all requirements of the underlying course. Do not allow traffic or other operations to disturb the finished underlying course and maintain in a satisfactory condition until the overlying course is placed.

3.5 GRADE CONTROL

Provide a finished and completed [subbase] [select-material subbase] [and] [rigid pavement base] course[s] conforming to the lines, grades, and cross sections shown. Place line and grade stakes as necessary for control.

3.6 MIXING AND PLACING MATERIALS

NOTE: Mor e det ai l s on appl i cabl e met hodS of pl aci ng, mi xi ng, and spr eadi ng wi l l be i ncl uded when appropriate.

Mix and place the materials to obtain uniformity of the material at the water content specified. Make such adjustments in mixing or placing procedures or in equipment as may be directed to obtain the true grades, to minimize segregation and degradation, to reduce or accelerate loss or increase of water, and to insure a satisfactory subbase course.

3.7 LAYER THICKNESS

NOTE: When subbase or r i gi d pavement base cour ses ar e const r uct ed l ess t han 150 mm ( 6 i nches) i n t ot al t hi ckness, a def i c i ency of 13 mm ( 1/ 2 i nch) i n t he t hi ckness of any ar ea of such pavi ng i s consi der ed excessi ve. Appl i cabl e t o j ob condi t i ons, t he t hi ckness t ol er ance pr ovi s i ons may be modi f i ed as r equi r ed, r est r i ct i ng al l def i c i enci es t o not mor e t han 6 mm ( 1/ 4 i nch) .

Compact the completed course to the thickness indicated. No individual layer may be thicker than 150 mm 6 inches nor be thinner than 75 mm 3 inches in compacted thickness. Compact the course(s) to a total thickness that is within 13 mm 1/2 inch of the thickness indicated. Where the measured thickness is more than 13 mm 1/2 inch deficient, correct such areas by scarifying, adding new material of proper gradation, reblading, and recompacting as directed. Where the measured thickness is more than 13 mm 1/2 inch thicker than indicated, the course will be considered as conforming to the specified thickness requirements. The average job thickness will be the average of all thickness measurements taken for the job and must be within 6 mm 1/4 inch of the thickness indicated. Measure the total thickness of the course(s) at intervals of one measurement for each [500] [_____] square meters yards of completed course. Measure total thickness using 75 mm 3 inch diameter test holes penetrating the completed course.

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3.8 COMPACTION

NOTE: Appr opr i at e per cent age wi l l be i nser t ed i n t he f i r st br acket ed bl ank. Cohesi onl ess mat er i al s ar e of t en f r ee- dr ai ni ng; as such, t he opt i mum wat er cont ent i s nor mal l y l i mi t ed t o t he maxi mum wat er cont ent t he mat er i al wi l l r et ai n. Thi s i s usual l y evi denced by f r ee wat er r unni ng f r om t he mol d dur i ng compact i on t est i ng.

Compact each layer of the material, as specified, with approved compaction equipment. Maintain water content during the compaction procedure to within plus or minus [2] [_____] percent of optimum water content determined from laboratory tests as specified in this Section. 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. Slightly vary the length of alternate trips of the roller.

Adjust speed of the roller as needed so that displacement of the aggregate does not occur. Compact mixture with hand-operated power tampers in all places not accessible to the rollers. [Continue compaction of the [subbase] [or select-material subbase] until each layer is compacted through the full depth to at least 100 percent of laboratory maximum density.] [Continue compaction of the rigid base course until each layer is compacted through the full depth to at least 95 [_____] percent of laboratory maximum density.] Make such adjustments in compacting or finishing procedures as may be directed by the Contracting Officer to obtain true grades, to minimize segregation and degradation, to reduce or increase water content, and to ensure a satisfactory [subbase] [and] [select-material subbase] [rigid pavement base] course. Remove any materials that are found to be unsatisfactory and replace with satisfactory material or rework, as directed, to meet the requirements of this specification.

3.9 PROOF ROLLING

NOTE: Dr awi ngs shoul d be checked t o ensur e t hat any suppl ement ar y i nf or mat i on r equi r ed by t hi s par agr aph has been shown and t hat t her e i s no conf l i c t bet ween t he dr awi ngs and t he speci f i cat i ons.

Pr oof r ol l i ng i s onl y r equi r ed when a subbase cour se i s used under a f l exi bl e ai r f i el d pavement wi t h t he f ol l owi ng condi t i ons:

Pr oof r ol l t he t op of t he compl et ed subbase cour se of Type A t r af f i c ar eas ( pr i mar y t axi ways) and t he cent er 23 m ( 75 f eet ) of r unways wi t h 30 cover ages f or Cl ass I V as wel l as heavy, modi f i ed heavy, and medi um l oad r unways. Pr oof r ol l t op of compl et ed subbase cour se on cent er 30. 5 met er s ( 100 f eet ) of r unways t hat suppor t f i ght er ai r cr af t onl y ( no P- 8 or heavi er ai r cr af t ) wi t h 8 cover ages. Pr oof r ol l t op of compl et ed subbase cour se on cent er 12 met er s ( 40 f eet ) of t axi ways t hat ar e not Type A t r af f i c .

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Appl y 4 cover ages t o al l ot her paved ar eas, excl usi ve of r unway over r un and bl ast pr ot ect i on areas.

The r equi r ed pr oof r ol l er i s a r ubber - t i r ed r ol l er bal l ast ed t o 13, 600 kg ( 30, 000 pounds) per t i r e wi t h a t i r e i nf l at i on pr essur e of at l east 862 kPa ( 125 psi ) . Typi cal commer ci al model s have f our wheel s abr east and a gr oss l oad of 54, 430 kg ( 60 t ons) .

In addition to the compaction specified, proof roll subbase course in areas designated on the drawings by application of [_____] coverages of a heavy pneumatic-tired roller having four or more tires abreast, each tire loaded to a minimum of 13,600 kg 30,000 pounds and inflated to a minimum of 862 kPa 125 psi . A coverage is defined as the application of one tire print over the designated area. In the areas designated, apply proof rolling to the top layer of the completed subbase course. Maintain water content of the top layer of the subbase course as specified in paragraph COMPACTION from start of compaction to completion of proof rolling.

Remove any subbase course materials that produce unsatisfactory results by proof rolling and replace with satisfactory materials. Then recompact and proof roll to meet specifications.

3.10 EDGES OF [SUBBASE] [AND] [SELECT-MATERIAL SUBBASE] [RIGID PAVEMENT

BASE COURSE]

Place approved material along the outer edges of the [subbase] [and] [select-material subbase] [rigid pavement base] course in sufficient quantity to compact to the thickness of the course being constructed.

When the course is being constructed in two or more layers, simultaneously roll and compact at least a 600 mm 2 foot width of this shoulder material with the rolling and compacting of each layer of the [subbase] [and] [select-material subbase] [rigid pavement base] course, as directed.

3.11 FINISHING

NOTE: Del et e par agr aph i f r i gi d pavement base cour se i s not i ncl uded i n t he pr oj ect .

Finish the surface of the top layer of rigid pavement base course after [final compaction] [and] [proof rolling] by cutting any overbuild to grade and rolling with a steel-wheeled roller. Do not add thin layers of material to the top layer of rigid pavement base course to meet grade. If the elevation of the top layer of rigid pavement base course is 13 mm 1/2 inch or more below grade, scarify the top layer to a depth of at least 75 mm 3 inches and blend new material in and compact [and proof roll] to bring to grade. Make adjustments to rolling and finishing procedures as directed by the Contracting Officer to minimize segregation and degradation, obtain grades, maintain moisture content, and insure an acceptable rigid pavement base course. Should the surface become rough, corrugated, uneven in texture, or traffic marked prior to completion, scarify the unsatisfactory portion and rework and recompact it or replace as directed.

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3.12 SMOOTHNESS TEST

Construct the top layer so that the surface shows no deviations in excess of 10 mm 3/8 inch when tested with a 3.66 m 12 foot straightedge. Take measurements in successive positions parallel to the centerline of the area to be paved. Also take measurements perpendicular to the centerline at [15] [_____] meter [50] [_____] foot intervals. Correct deviations exceeding this amount by removing material and replacing with new material, or by reworking existing material and compacting it to meet these specifications.

3.13 FIELD QUALITY CONTROL

3.13.1 In-Place Tests

Perform one of each of the following tests on samples taken from the placed and compacted [subbase] [and] [select-material subbase] [rigid pavement base] course. Take samples and test at the rates indicated.

a. Perform density tests on every lift of material placed and at a frequency of one set of tests for every 500 [_____] square meters yards , or portion thereof, of completed area.

b. Perform sieve analysis [including 0.02 mm size material] on every lift of material placed and at a frequency of one sieve analysis for every 1,000 [_____] square meters yards , or portion thereof, of material placed.

c. Perform liquid limit and plasticity index tests at the same frequency as the sieve analysis.

d. Measure the thickness of each course at intervals providing at least one measurement for each 500 [_____] square meters yards or part thereof. Measure the thickness using test holes, at least 75 mm 3 inches in diameter through the course.

3.13.2 Approval of Material

Final approval of the materials will be based on tests for gradation, liquid limit, and plasticity index performed on samples taken from the completed and fully compacted course(s).

3.14 TRAFFIC

NOTE: Tr af f i c wi l l not be al l owed on any base cour se pl aced f or ai r f i el d pavement s. For r oads, t r af f i c shoul d onl y be al l owed on t he base cour ses when i t cannot be di ver t ed el sewher e; but pr ecaut i ons shoul d be t aken t o l i mi t t he t r af f i c and keep heavy equi pment of f . Any damage caused by t r af f i c shoul d be r epai r ed t o meet t hese speci f i cat i on r equi r ement s. Desi gner wi l l choose t he appr opr i at e br acket ed i nf or mat i on.

[Do not allow traffic on the completed [subbase] [and] [rigid pavement base] course.] [Completed portions of the rigid pavement base course may be opened to limited traffic, provided there is no marring or distorting

SECTION 32 11 20 Page 18 of the surface by the traffic. Do not allow heavy equipment on the completed rigid pavement base course except when necessary for construction. When it is necessary for heavy equipment to travel on the completed rigid pavement base course, protect the area against marring or damage to the completed work.]

3.15 MAINTENANCE

Maintain the completed course in a satisfactory condition until the full pavement section is completed and accepted. Immediately repair any defects and repeat repairs as often as necessary to keep the area intact.

Retest any course that was not paved over prior to the onset of winter to verify that it still complies with the requirements of this specification. Rework or replace any area that is damaged as necessary to comply with this specification.

3.16 DISPOSAL OF UNSATISFACTORY MATERIALS

Dispose of any unsuitable materials that have been removed [outside the limits of Government-controlled land] [as directed] [in waste disposal areas indicated]. No additional payments will be made for materials that have to be replaced.

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