Attachment 4.9 UFGS 32 12 13.pdf

USACE / NAVFAC / AFCEC / NASA UFGS- 32 12 13 ( May 2017) Pr epar i ng Act i v i t y: USACE Super sedi ng UFGS- 32 12 10 ( 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 Apr i l 2020

SECTION TABLE OF CONTENTS

DIVISION 32 - EXTERIOR IMPROVEMENTS

SECTION 32 12 13

BITUMINOUS TACK AND PRIME COATS

05/17

PART 1 GENERAL

1.1 UNIT PRICES

1.1.1 Measurement

1.1.2 Payment

1.1.3 Waybills and Delivery Tickets

1.2 REFERENCES

1.3 SUBMITTALS

1.4 QUALITY ASSURANCE

1.5 DELIVERY, STORAGE, AND HANDLING

1.6 EQUIPMENT, TOOLS AND MACHINES

1.6.1 General Requirements

1.6.2 Bituminous Distributor

1.6.3 Heating Equipment for Storage Tanks

1.6.4 Power Brooms and Power Blowers

1.7 ENVIRONMENTAL REQUIREMENTS

PART 2 PRODUCTS

2.1 PRIME COAT

2.1.1 Cutback Asphalt

2.1.2 Emulsified Asphalt

2.2 TACK COAT

2.2.1 Asphalt Cement

2.2.2 Cutback Asphalt

2.2.3 Emulsified Asphalt

2.2.4 Local/Regional Materials

PART 3 EXECUTION

3.1 PREPARATION OF SURFACE

3.2 APPLICATION RATE

3.2.1 Tack Coat

3.2.2 Prime Coat

3.3 APPLICATION TEMPERATURE

3.3.1 Viscosity Relationship

SECTION 32 12 13 Page 1

3.3.2 Temperature Ranges

3.4 APPLICATION

3.4.1 General

3.4.2 Prime Coat

3.4.3 Tack Coat

3.5 CURING PERIOD

3.6 FIELD QUALITY CONTROL

3.7 SAMPLING AND TESTING

3.7.1 Sampling

3.7.2 Calibration Test

3.7.3 Trial Applications

3.7.3.1 Tack Coat Trial Application Rate

3.7.3.2 Prime Coat Trial Application Rate

3.7.4 Sampling and Testing During Construction

3.8 TRAFFIC CONTROLS

-- End of Section Table of Contents --

SECTION 32 12 13 Page 2

USACE / NAVFAC / AFCEC / NASA UFGS- 32 12 13 ( May 2017) Pr epar i ng Act i v i t y: USACE Super sedi ng UFGS- 32 12 10 ( 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 Apr i l 2020

SECTION 32 12 13

BITUMINOUS TACK AND PRIME COATS

05/17

NOTE: Thi s gui de speci f i cat i on cover s t he r equi r ement s f or bi t umi nous t ack and pr i me coat s f or ai r f i el d pavement s, r oads, par ki ng ar eas and gener al pavi ng needs.

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

1.1 UNIT PRICES

NOTE: Del et e uni t pr i ce par agr aphs when l ump sum bi ddi ng i s used. Edi t submi t t al r equi r ement s accordingly.

1.1.1 Measurement

NOTE: When t he bi t umi nous mat er i al i s measur ed i n liters gal l ons, t he appr opr i at e ASTM met hod wi l l be r et ai ned f or t he t ype of bi t umi nous mat er i al speci f i ed. The quant i t y of mat er i al wi l l be t he

SECTION 32 12 13 Page 3 quant i t y of r esi dual asphal t .

The bituminous material paid for will be the measured quantities of residual bituminous material used in the accepted work, provided that the measured quantities are not 10 percent over the specified quantities. Any amount of bituminous material more than 10 percent over the specified quantity will be deducted from the measured quantities. Express measured quantities in [ metric tons 2000 pound tons ] [ liters at 15.6 degrees C gallons at 60 degrees F ]. Correct volumes measured at temperatures other than 15.6 degrees C 60 degrees F in accordance with ASTM D1250 using a coefficient of expansion of 0.00045 per degree C 0.00025 per degree F for asphalt emulsion.

1.1.2 Payment

The quantities of bituminous material, determined as specified above, will be paid for at the respective contract unit prices. Payment will constitute full compensation for all operations necessary to complete the work as specified herein.

1.1.3 Waybills and Delivery Tickets

Submit waybills and delivery tickets, during progress of the work. Before the final statement is allowed, file with the Contracting Officer certified waybills and certified delivery tickets for all bituminous materials used in the construction of the pavement covered by the contract. These submittals are required for Unit Pricing bid only. Do not remove bituminous material from storage until the initial outage and temperature measurements have been taken. The delivery or storage units will not be released until the final outage has been taken.

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 Ref er ence I dent i f i er ( 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.

SECTION 32 12 13 Page 4

AMERICAN ASSOCIATION OF STATE HIGHWAY AND TRANSPORTATION OFFICIALS

(AASHTO)

AASHTO T 102 (2009; R 2013) Standard Method of Test for Spot Test of Asphaltic Materials

ASTM INTERNATIONAL (ASTM)

ASTM D140/D140M (2016) Standard Practice for Sampling Asphalt Materials

ASTM D946/D946M (2015) Penetration-Graded Asphalt Cement for Use in Pavement Construction

ASTM D977 (2019a; E 2019) Standard Specification for Emulsified Asphalt

ASTM D1250 (2019) Standard Guide for Use of the Joint API and ASTM Adjunct for Temperature and Pressure Volume Correction Factors for Generalized Crude Oils, Refined Products, and Lubricating Oils: API MPMS Chapter 11.1

ASTM D2026/D2026M (2015) Cutback Asphalt (Slow-Curing Type)

ASTM D2027/D2027M (2019) Cutback Asphalt (Medium-Curing Type)

ASTM D2028/D2028M (2015) Cutback Asphalt (Rapid-Curing Type)

ASTM D2397/D2397M (2019a) Standard Specification for Cationic Emulsified Asphalt

ASTM D2995 (1999; R 2009) Determining Application Rate of Bituminous Distributors

ASTM D6373 (2016) Standard Specification for Performance Graded Asphalt Binder

U.S. GREEN BUILDING COUNCIL (USGBC)

LEED BD+C (2009; R 2010) Leadership in Energy and Environmental Design(tm) Building Design and Construction (LEED-NC)

1.3 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 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 desi gnat 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

SECTION 32 12 13 Page 5 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 submi t t al s r equi r i ng Gover nment appr oval on Ar my pr oj ect s, a code of up t o t hr ee char act er s wi t hi n t he submi t t al t ags may be used f ol l owi ng t he " G" desi gnat i on 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. pr oj ect s.

The " S" f ol l owi ng a submi t t al i t em i ndi cat es t hat t he submi t t al i s r equi r ed f or t he Sust ai nabi l i t y eNot ebook t o f ul f i l l f eder al l y mandat ed sust ai nabl e r equi r ement s i n accor dance wi t h Sect i on 01 33 29 SUSTAI NABI LI TY REPORTI NG. Locat e t he " S" submi t t al under t he SD number t hat best descr i bes t he submi t t al i t em.

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" designation;

submittals not having a "G" designation are for [Contractor Quality Control approval.] [information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government.] Submittals with an "S" are for inclusion in the Sustainability eNotebook, in conformance to Section 01 33 29 SUSTAINABILITY REPORTING. Submit the following in accordance with Section

01 33 00 SUBMITTAL PROCEDURES:

SD-03 Product Data

Waybills and Delivery Tickets

Local/Regional Materials

SD-06 Test Reports

Sampling and Testing

1.4 QUALITY ASSURANCE

Certificates of compliance for asphalt materials delivered will be obtained and checked to ensure that specification requirements are met.

Quantities of applied material will be determined. Payment will be for amount of residual asphalt applied. Tack coat materials will not be diluted. Prime coat materials when emulsions are used can be diluted on site with potable water up to 1 part emulsion to 1 part water.

SECTION 32 12 13 Page 6

1.5 DELIVERY, STORAGE, AND HANDLING

Inspect the materials delivered to the site for contamination and damage.

Unload and store the materials with a minimum of handling.

1.6 EQUIPMENT, TOOLS AND MACHINES

1.6.1 General Requirements

Equipment, tools and machines used in the work are subject to approval.

Maintain in a satisfactory working condition at all times. Calibrate equipment such as asphalt distributors, scales, batching equipment, spreaders and similar equipment within 12 months of their use. If the calibration expires during project, recalibrate the equipment before work can continue.

1.6.2 Bituminous Distributor

Provide a self propelled distributor with pneumatic tires of such size and number to prevent rutting, shoving or otherwise damaging the surface being sprayed. Calibrate the distributer in accordance with ASTM D2995. Design and equip the distributor to spray the bituminous material in a uniform coverage at the specified temperature, at readily determined and controlled total liquid rates from 0.14 to 4.5 L/square meter 0.03 to 1.0 gallons per square yard , with a pressure range of 172.4 to 517.1 kPa 25 to 75 psi and with an allowable variation from the specified rate of not more than plus or minus 5 percent, and at variable widths. Include with the distributor equipment a separate power unit for the bitumen pump, full-circulation spray bars, tachometer, pressure gauges, volume-measuring devices, adequate heaters for heating of materials to the proper application temperature, a thermometer for reading the temperature of tank contents, and a hand hose attachment suitable for applying bituminous material manually to areas inaccessible to the distributor. The distributor will be capable of circulating and agitating the bituminous material during the heating process.

1.6.3 Heating Equipment for Storage Tanks

Use steam, electric, or hot oil heaters for heating the bituminous material. Provide steam heaters consisting of steam coils and equipment for producing steam, so designed that the steam cannot come in contact with the bituminous material. Fix an armored thermometer to the tank with a temperature range from 4.4 to 204.4 degrees C 40 to 400 degrees F so that the temperature of the bituminous material may be determined at all times.

1.6.4 Power Brooms and Power Blowers

Use power brooms and power blowers suitable for cleaning the surfaces to which the bituminous coat is to be applied.

1.7 ENVIRONMENTAL REQUIREMENTS

Apply bituminous coat only when the surface to receive the bituminous coat is dry. A limited amount of moisture (approximately 0.14 liter/square meter 0.03 gallon/square yard ) can be sprayed on the surface of unbound material when prime coat is used to improve coverage and penetration of asphalt material. Apply bituminous coat only when the atmospheric temperature in the shade is 10 degrees C 50 degrees F or above and when

SECTION 32 12 13 Page 7 the temperature has not been below 2 degrees C 35 degrees F for the 12 hours prior to application, unless otherwise directed.

PART 2 PRODUCTS

2.1 PRIME COAT

NOTE: Remove br acket s f r om ar ound t he mat er i al t o be al l owed i n t he cont r act speci f i cat i ons and del et e t he ot her mat er i al s and r ef er ences.

a. Wi t h gr owi ng envi r onment al / saf et y r egul at i ons, an i ncr easi ng number of st at es ar e pr ohi bi t i ng t he use of cut back asphal t s i n f avor of emul si f i ed asphal t mat er i al s. For pr i me coat , cut back asphal t penet r at es t he unbound mat er i al bet t er t han emul si on and hence i s of t en pr ef er r ed i f avai l abl e. I f cut back asphal t s ar e used, one of t he f ol l owi ng t ypes and gr ades i s r ecommended ( medi um- cur i ng t ype cut back asphal t s ar e t he most common t ype of cut backs used as pr i me coat ) :

Sl ow- Cur i ng Type ( ASTM D2026/ D2026M) : SC- 70, SC- 250.

Medi um- Cur i ng Type ( ASTM D2027/ D2027M) : MC- 30, MC- 70, MC- 250.

Rapi d- Cur i ng Type ( ASTM D2028/ D2028M) : RC- 70, RC- 250.

Sel ect i on of a par t i cul ar t ype and gr ade shoul d consi der t he nat ur e of t he sur f ace t o be t r eat ed.

An open base cour se mat er i al wi l l be penet r at ed r eadi l y, and al l of t he above t ypes and gr ades can be consi der ed except f or t he l ow vi scosi t y MC- 30. A t i ght sur f ace wi l l be penet r at ed as r eadi l y;

t her ef or e, t he l ess v i scous mat er i al s ar e r ecommended such as RC- 70, MC- 30, MC- 70 and SC- 70.

Some caut i on mi ght be ur ged i n usi ng RC- 70 or RC- 250 because t he sol vent may separ at e or be absor bed by t he base cour se f i nes and l eave t he asphal t deposi t ed on t he sur f ace. Cut back asphal t s can be used i n col d- weat her const r uct i on wi t h l ess concer n t han emul si ons whi ch cont ai n wat er . Less v i scous gr ades such as RC- 70, MC- 30 and MC- 70 may be used f or col d- weat her const r uct i on.

b. The f ol l owi ng t ypes of emul si ons can be used f or pr i me coat s:

Ani oni c Emul si ons ASTM D977: SS- 1, SS- 1h.

Cat i oni c Emul si ons ASTM D2397/ D2397M: CSS- 1, CSS- 1h.

Some st at e DOTs use an asphal t emul si on t hat i s desi gned f or pr i me coat . I t i s nor mal l y r ef er r ed t o as EA- P ( st andi ng f or emul si f i ed asphal t - pr i me) .

Emul si ons gener al l y do not penet r at e ver y much i nt o t he under l y i ng l ayer and t hese speci al l y desi gned

SECTION 32 12 13 Page 8 emul si ons pr ovi de bet t er penet r at i on. Thi s t ype of emul si on i s pr ef er r ed f or pr i me coat i f avai l abl e.

Penet r at i on and coat i ng of pr i me coat mat er i al wi l l be most ef f i c i ent at appr oxi mat el y opt i mum moi st ur e cont ent . Wat er di l ut i on of t he emul si on i s al so somet i mes r equi r ed f or pr i me coat t o i mpr ove penet r at i on but di l ut i on of t ack coat mat er i al s shoul d not be al l owed.

Provide asphalt conforming to one of the following grades:

2.1.1 Cutback Asphalt

Provide cutback asphalt conforming to [ ASTM D2026/D2026M , Grade [SC-70] [SC-250]] [ ASTM D2027/D2027M , Grade [MC-30] [MC-70] [MC-250]] [ ASTM D2028/D2028M , Grade [RC-70] [RC-250]].

2.1.2 Emulsified Asphalt

Provide emulsified asphalt conforming to [ ASTM D977, Type [SS-1] [SS1h]] [ ASTM D2397/D2397M , Type [CSS-1] [CSS-1h]]. Asphalt emulsion can be diluted up to 1 part water to 1 part emulsion for prime coat use. Do not dilute asphalt emulsion for tack coat use.

2.2 TACK COAT

NOTE: Tack coat r educes wat er penet r at i on i nt o a pavement and shoul d not be used i n per vi ous pavement syst ems. When a per vi ous pavement syst em i s speci f i ed, t he t ack coat i s of t en del et ed because i t may seal t he voi ds i n t he per vi ous pavement , but t hi s has t o be det er mi ned dur i ng desi gn. I f t ack coat i s not used, del et e al l r ef er ences t o t ack coat i n t hi s sect i on.

Emul si f i ed asphal t gr ades ar e sui t abl e f or t ack coat appl i cat i ons. Consi der t he f ol l owi ng when eval uat i ng al t er nat e gr ades t o be speci f i ed f or t he project:

a. Local pr act i ce as wel l as avai l abi l i t y and cost of var i ous gr ades wi t hi n t he ar ea.

b. Wher e a r api d- set t i ng emul si on i s r equi r ed, consi der use of RS- 1 and CRS- 1.

c. For most appl i cat i ons, cat i oni c and ani oni c emul si ons wi l l per f or m equal l y wel l . Ani oni c emul si ons such as SS- 1 may pr ovi de bet t er adhesi on t o cal car eous aggr egat es wi t h pH l ess t han 7, such as l i mest one. Cat i oni c emul si ons such as CSS- 1 may pr ovi de bet t er adhesi on t o s i l i ceous aggr egat es wi t h pH gr eat er t han 7, such as gr ani t e.

d. I n war mer c l i mat es, consi der t he use of " h" gr ade emul si ons wi t h a har der base asphal t and l ower

SECTION 32 12 13 Page 9 penet r at i on such as SS- 1h and CSS- 1h.

e. Gr ades SS- 1h and CSS- 1h ar e r ecommended f or ai r f i el ds. The ot her gr ades can be consi der ed f or gener al use. Gr ades RS- 1, SS- 1, and SS- 1h ar e t he most wi del y used t ack coat mat er i al s.

f . Sever al st at e DOTs have begun t o use t ack coat s wi t h r educed t r acki ng t o mi ni mi ze spr eadi ng t he t ack coat al l al ong t he t r uck r out e. These ar e of t en pr opr i et ar y mat er i al s. Bef or e speci f y i ng, check wi t h l ocal DOT t o det er mi ne t hei r exper i ence wi t h t hese r educed t r acki ng mat er i al s.

g. Not e A i n TABLE 1 of ASTM D2028/ D2028M shoul d be r evi ewed and t he mat er i al speci f i ed by v i scosi t y or penet r at i on. Except f or Navy pr oj ect s, cut back asphal t gr ades r ecommended f or t ack ar e RC- 70 and RC- 250. I n col d- weat her const r uct i on, cut back asphal t can be used wi t h l ess concer n t han emul si ons whi ch cont ai n wat er .

h. Pavi ng gr ade asphal t s can al so be used i n t ack coat appl i cat i ons. Hi gh heat i s r equi r ed t o achi eve spr ayi ng consi st ency f or t hese mat er i al s. When asphal t cement i s used, t he t ack coat gr ade shoul d be t he same gr ade as t hat f or t he asphal t mi xt ur e or t he nor mal unmodi f i ed asphal t gr ade used f or t he l ocal ar ea by t he DOT.

2.2.1 Asphalt Cement

NOTE: See Not e h. above f or gui dance on sel ect ed gr ade of asphal t cement f or use.

Provide asphalt cement conforming to [ ASTM D946/D946M] or [ ASTM D6373] Grade [_____].

2.2.2 Cutback Asphalt

Provide cutback asphalt conforming to ASTM D2028/D2028M , [Grade RC-70]

[RC-250].

2.2.3 Emulsified Asphalt

Provide emulsified asphalt conforming to [ ASTM D977, Type [RS-1] [MS-1] [HFMS-1] [SS-1] [SS1h]] [ ASTM D2397/D2397M , Type [CRS-1] [CSS-1] [CSS-1h]]. For prime coats the emulsified asphalt can be diluted with up to 1 part emulsion to 1 part water. No dilution is allowed for tack coat applications. The base asphalt used to manufacture the emulsion is required to show a negative spot when tested in accordance with

SECTION 32 12 13 Page 10

AASHTO T 102 using standard naphtha.

2.2.4 Local/Regional Materials

NOTE: Usi ng l ocal mat er i al s can hel p mi ni mi ze t r anspor t at i on i mpact s, i ncl udi ng f ossi l f uel consumpt i on, ai r pol l ut i on, and l abor . Usi ng mat er i al s har vest ed and manuf act ur ed wi t hi n a 800 km ( 500 mi l e) r adi us f r om t he pr oj ect s i t e cont r i but es t o t he f ol l owi ng LEED cr edi t : MR5. Coor di nat e wi t h Section 01 33 29 SUSTAI NABI LI TY REPORTI NG. Use second opt i on i f Cont r act or i s choosi ng l ocal mat er i al s i n accor dance wi t h Sect i on 01 33 29 SUSTAI NABI LI TY REPORTI NG. Use second opt i on f or USACE pr oj ect s. Ar my pr oj ect s shoul d i ncl ude opt i on, onl y i f pur sui ng t hi s LEED cr edi t .

[Use Local/Regional Materials or products extracted, harvested, or recovered, as well as manufactured, within a [800] [_____] km [500] [_____] mile radius from the project site, if available from a minimum of three sources.] [See Section 01 33 29 SUSTAINABILITY REPORTING for cumulative total local material requirements. Tack and prime coat materials may be locally available.] [Submit documentation indicating distance between manufacturing facility and the project site. Indicate distance of raw material origin from the project site. Indicate relative dollar value of local/regional materials to total dollar value of products included in project in accordance with LEED BD+C.]

PART 3 EXECUTION

3.1 PREPARATION OF SURFACE

NOTE: I f t he sur f ace t o be t r eat ed r equi r es r epai r , t he met hod of r epai r and ext ent of wor k i nvol ved shoul d be shown or descr i bed.

Immediately before applying the bituminous coat, remove all loose material, dirt, clay, or other objectionable material from the surface to be treated by means of a power broom or blower supplemented with hand brooms. Apply treatment only when the surface is dry and clean.

3.2 APPLICATION RATE

The exact quantities within the range specified, which may be varied to suit field conditions, will be determined by the Contracting Officer.

3.2.1 Tack Coat

Apply bituminous material for the tack coat in quantities of not less than

0.14 L 0.03 gallons nor more than 0.46 L/square meter 0.10 gallons per square yard of residual asphalt onto the pavement surface as approved by the Contracting Officer. Do not dilute asphalt emulsion when used as a tack coat.

SECTION 32 12 13 Page 11

3.2.2 Prime Coat

Apply bituminous material for the prime coat in quantities of not less than

0.23 L 0.05 gallons nor more than 0.54 L/square meter 0.12 gallons per square yard of residual asphalt for asphalt emulsion up to a 1 to 1 dilution rate or for residual asphalt for cutback asphalt.

3.3 APPLICATION TEMPERATURE

3.3.1 Viscosity Relationship

Apply asphalt at a temperature that will provide a viscosity between 10 and 60 seconds, Saybolt Furol, or between 20 and 120 square mm/sec 20 and 120 centistokes , kinematic. Furnish the temperature viscosity relation to the Contracting Officer.

3.3.2 Temperature Ranges

NOTE: Nor mal spr ay appl i cat i on t emper at ur es ar e pr ovi ded. Edi t and coor di nat e mat er i al s wi t h Par t 2 PRODUCTS. Ret ai n mat er i al t o be al l owed i n t he speci f i cat i on and del et e t he ot her mat er i al s.

The viscosity requirements determine the application temperature to be used. The following is a normal range of application temperatures:

Cutback Asphalts

MC-30 29-87 degrees C 85-190 degrees F

SC-70, MC-70,

RC-70

50-107 degrees C 120-225 degrees F

SC-250, MC-250,

RC-250

75-132 degrees C 165-270 degrees F

Asphalt Emulsion

All Grades 20-70 degrees C 70-160 degrees F

Asphalt Cement

All Grades 135-175 degrees C 275-350 degrees F

Some of these temperatures for rapid cure cutbacks are above the flash point of the material and care should be taken in their heating.

3.4 APPLICATION

NOTE: Pr i me coat s ar e r equi r ed f or Navy pr oj ect s.

I f t he desi gner f or Ar my j obs chooses not t o speci f y a pr i me coat at t he t i me of desi gn, del et e al l r ef er ences t o a pr i me coat wi t hi n t hi s sect i on.

Gener al l y a pr i me coat shoul d be used but may be del et ed i n cer t ai n s i t uat i ons. For exampl e, t he pr i me coat may be del et ed when i t i s necessar y t o

SECTION 32 12 13 Page 12 r educe const r uct i on t i me or when a dr ai nage l ayer i s used under neat h t he hot mi x asphal t . Be car ef ul about del et i ng a pr i me coat f or t hi nner pavement s ( l ess t han 4 i nches) s i nce i t s use i s mor e cr i t i cal f or t hi nner sect i ons.

3.4.1 General

Following preparation and subsequent inspection of the surface, apply the bituminous prime or tack coat with the bituminous distributor at the specified rate with uniform distribution over the surface to be treated.

Properly treat all areas and spots, not capable of being sprayed with the distributor, with the hand spray. Until the succeeding layer of pavement is placed, maintain the surface by protecting the surface against damage and by repairing deficient areas at no additional cost to the Government.

If required, spread clean dry sand to effectively blot up any excess bituminous material. No smoking, fires, or flames other than those from the heaters that are a part of the equipment are permitted within 8 meters 25 feet of heating, distributing, and transferring operations of cutback materials. Prevent all traffic, except for paving equipment used in constructing the surfacing, from using the underlying material, whether primed or not, until the surfacing is completed. The bituminous coat requirements are described herein.

3.4.2 Prime Coat

NOTE: Condi t i ons wher e a pr i me coat may be benef i c i al i ncl ude: pr event i ng l at er al movement of t he unbound base dur i ng pavement const r uct i on, r educi ng l at er al movement of t he asphal t mi xt ur e dur i ng compact i on over t he unbound mat er i al , wat er pr oof i ng dur i ng pavement const r uct i on, and f or mi ng a t i ght base t o whi ch t he asphal t pavement wi l l adher e. To speci f y t he appl i cat i on of a pr i me coat , r et ai n t he f i r st br acket ed sent ence and del et e t he t ext wi t hi n t he second set of br acket s.

I ndi cat e pr i me coat on dr awi ngs.

I f t he pr i me coat wi l l be r et ai ned as a Cont r act or ' s opt i on, del et e t he f i r st sent ence and r et ai n t he br acket ed t ext i n t he second set of br acket s.

[Apply a prime coat at locations shown on the Drawings.] [The prime coat is required if it will be at least [7] [_____] days before the asphalt mixture is constructed on the underlying (base course, etc.) compacted material. The type of liquid asphalt and application rate will be as specified herein. Protect the underlying layer from any damage (water, traffic, etc.) until the surfacing is placed. If the Contractor places the surfacing within seven days, the choice of protection measures or actions to be taken is at the Contractor's option. Repair (recompact or replace) damage to the underlying material caused by lack of, or inadequate, protection by approved methods at no additional cost to the Government. If the Contractor opts to use the prime coat, apply as soon as possible after consolidation of the underlying material.] Apply the bituminous material uniformly over the surface to be treated at a pressure range of 172.4 to 517.1 kPa 25 to 75 psi ; the rate will be as specified

SECTION 32 12 13 Page 13 above in paragraph APPLICATION RATE. To obtain uniform application of the prime coat on the surface treated at the junction of previous and subsequent applications, spread building paper on the surface for a sufficient distance back from the ends of each application to start and stop the prime coat on the paper and to ensure that all sprayers will operate at full force on the surface to be treated. Immediately after application remove and destroy the building paper.

3.4.3 Tack Coat

Apply tack coat at the locations shown on the drawings. A tack coat should be applied to every bound surface (asphalt or concrete pavement) that is being overlaid with asphalt mixture and at transverse and longitudinal joints. Apply the tack coat when the surface to be treated is clean and dry. Immediately following the preparation of the surface for treatment, apply the bituminous material by means of the bituminous distributor, within the limits of temperature specified herein and at a rate as specified above in paragraph APPLICATION RATE. Apply the bituminous material so that uniform distribution is obtained over the entire surface to be treated. Treat lightly coated areas and spots missed by the distributor by spraying with a hand wand or using other approved method. Following the application of bituminous material, allow the surface to cure without being disturbed for period of time necessary to permit setting of the tack coat. Apply the bituminous tack coat only as far in advance of the placing of the overlying layer as required for that day's operation. Maintain and protect the treated surface from damage until the succeeding course of pavement is placed.

3.5 CURING PERIOD

NOTE: Ret ai n br acket ed sent ence i f pr i me coat i s specified.

Following application of the bituminous material and prior to application of the succeeding layer of asphalt mixture allow the bituminous coat to cure and water or volatiles to evaporate prior to overlaying. Maintain the tacked surface in good condition until the succeeding layer of pavement is placed, by protecting the surface against damage and by repairing and recoating deficient areas. [Allow the prime coat to cure without being disturbed for a period of at least 48 hours or longer, as may be necessary to attain penetration into the treated course. Furnish and spread enough sand to effectively blot up excess bituminous material.]

3.6 FIELD QUALITY CONTROL

Obtain certificates of compliance for all asphalt material delivered to the project. Obtain samples of the bituminous material under the supervision of the Contracting Officer. The sample may be retained and tested by the Government at no cost to the Contractor.

3.7 SAMPLING AND TESTING

Furnish certified copies of the manufacturer's test reports indicating temperature viscosity relationship for cutback asphalt or asphalt cement, compliance with applicable specified requirements, not less than 5 days before the material is required in the work.

SECTION 32 12 13 Page 14

3.7.1 Sampling

Unless otherwise specified, sample bituminous material in accordance with

ASTM D140/D140M.

3.7.2 Calibration Test

Furnish all equipment, materials, and labor necessary to calibrate the bituminous distributor. Calibrate using the approved job material and prior to applying the bituminous coat material to the prepared surface.

Calibrate the bituminous distributor in accordance with ASTM D2995.

3.7.3 Trial Applications

Before applying the spray application of tack or prime coat, apply three lengths of at least 30 meters 100 feet for the full width of the distributor bar to evaluate the amount of bituminous material that can be satisfactorily applied.

3.7.3.1 Tack Coat Trial Application Rate

Unless otherwise authorized, apply the trial application rate of bituminous tack coat materials in the amount of 0.23 L/square meter 0.05 gallons per square yard . Make other trial applications using various amounts of material as may be deemed necessary.

3.7.3.2 Prime Coat Trial Application Rate

Unless otherwise authorized, apply the trial application rate of bituminous materials in the amount of 0.66 L/square meter 0.15 gallon per square yard . Make other trial applications using various amounts of material as may be deemed necessary.

3.7.4 Sampling and Testing During Construction

Perform quality control sampling and testing as required in paragraph

FIELD QUALITY CONTROL.

3.8 TRAFFIC CONTROLS

Keep traffic off surfaces freshly treated with bituminous material.

Provide sufficient warning signs and barricades so that traffic will not travel over freshly treated surfaces.

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