Wisconsin WisDOT Standard Specifications (within FDM) — Section 450

Effective with the December 2018 Letting 165 2019 Standard Spec ifications Section 450 General Requirements for Asphaltic Pavements

450.1Description

(1)This section describes requirem ents common to plant mixed asph altic bases and pavements.

Exceptions and additional requirements are specified in 455 thr ough 475.

450.2Materials

450.2.1 Acronyms and Definitions

(1)Interpret materials related ac ronyms used in sections 450 through 499 as follows:

FRAP Fractioned reclaimed asphaltic pavement HMA Hot mix asphalt JMF Job mix formula PG Performance graded RAP Reclaimed asphaltic pavement RAS Recycled asphalt shingles SMA Stone matrix asphalt VMA Voids in mineral aggregate WMA Warm mix asphalt

(2)Interpret materials related def initions used in sections 450 t hrough 499 as follows:

Additive A material blended with asphalt ic binder or aggregate to enhance the characteristics of the final HMA blend, but that does not a lter the binder performance grade. Asphaltic binder The predominant asphalt cement in HMA. Filler Mineral fillers, used primar ily to fill voids between aggregat e particles to meet gradation requirements. Fractionated reclaimed asphaltic pavement Reclaimed asphalt pavement processed by screening and separating by maximum and minimu m particle size, asphalt content, asphalt performance grade, and aggregate characteristics. Leveling layer A thin HMA layer placed to eliminate irregularities in the pro file or thickness of underlying pavement layers. Lower layer An asphaltic pavement layer bel ow the upper layer in the compl eted pavement structure. There may be multiple lower layers. Modifier A material blended with the asphaltic binder to enhance its characteristics by modifying th e performance grade of the binde r. Reclaimed asphaltic pavement Material resulting from cold m illing or crushing existing asph altic pavement. Recycled asphalt shingles Waste material from a shingle manufacturing facility, either n ew or used material salvaged from resid ential roofing operations, or any combination of these materials ground to ensure that 100 percen t will pass a 3/8 sieve and processed to rem ove deleterious mater ial. Upper layer The top asphaltic pavement layer in direct contact with traffi c in the completed pavements tructure. There is only one upper layer. Warm mix asphalt Asphaltic mixture containing a w arm mix additive or using a warm mix process that reduces the mi xing and compaction temperatures typically required for that application. Wedging A tapered layer of asphaltic pavement used to build up an exis ting surface. Wedging layers may be th icker or thinner than standard pavement layers. 450.2.2 Aggregate Sampling and Testing

(1)The department and the contractor will sample and test accordi ng to the following methods, except as

revised with the engineer's approval: Sampling a ggregates .......................................................................................................... .............. AASHTO T2 Material finer than No. 200 sieve ............................. ............................................................... ........ AASHTO T11 Sieve analysis o f aggregates .................................. ............................................................... ......... AASHTO T27 Mechanical analysis o f extracted aggregate .................... ............................................................... AASHTO T30 Sieve analysis o f mineral filler .............................. ............................................................... ........... AASHTO T37 Los Angeles abrasion of coarse aggregate ...................... .............................................................. AASHTO T96 Freeze-thaw soundness of coarse a ggregate ..................... .......................................................... AASH TO T103

Effective with the December 2018 Letting 166 2019 Standard Spec ifications Sodium sulfate soundness of aggregates (R-4, 5 cycles) ........ ..................................................... AASHTO T1 04 Extraction o f bitumen ......................................... ............................................................... ............ AASHT O T164

450.3Construction

450.3.1 Equipment 450.3.1.1 Asphalt Plants 450.3.1.1.1 Plant Scales

(1)Provide beam, springless, dial, or digital scales on weigh boxes and silos. Use scales of a standard

make and design accurate to within 0.5 percent of the maximum required load. For each plant, provide at least ten standard 50 pound wei ghts accurate to within 0.1 p ercent. For each scale, provide a suitable cradle or platform for applying test loads.

(2)If using beam scales for aggregate, provide a separate beam fo r each size of aggregate. Also provide

a device that warns when the applied load is within 200 pounds of the required load.

(3)If using beam scales for asphalti c materials, provide a tare b eam and a full capacity beam with a

minimum graduation no greater t han 2 pounds. Also provide a dev ice that warns when the applied load is within 20 pounds of the required load.

(4)If using dial scales, provide a s tandard make springless scale designed, constructed, and installed to

be vibration free. Ensure that all dials are plainly visible to the operator at all times. Equip with adjustable pointers for marking the weight of each material bat ched.

(5)If using digital scales, confor m to National Bureau of Standar ds Handbook 44.

450.3.1.1.2 Automatic Batching

(1)On contracts with 10,000 tons or more, provide automated batch plants. Ensure that the plants' control

system can coordinate mixture proportioning, ti ming, and discharge by the operation of a single control. Also provide an autom atic batch weighing, cycling, and monitoring system.

(2)On contracts with less than 10,000 tons, if the contractor ele cts to use batch plant automatic systems,

conform to the requirements her e under 450.3.1.1.2. The contrac tor need not use automatic recordation. If the contractor elects to use automatic recordation, conform to 450.3.1.1.4 for truck loads, or 450.3.1.1.3 for batch weights.

(3)Ensure that the system accuratel y proportions mixture componen ts by weight or volume in the proper

order and controls the mixing cy cle sequence and timing. Provid e interlocks that ensure that the scale is at zero before a batch can st art and that the batch is mixed completely before discharge. Do not start subsequent batches before completely discharging the prev ious batch. Also provide interlocks that ensure that all batch mater ials are in the mixer before th e batch can discharge. Ensure that unauthorized personnel cannot alter mix designs and that equipm ent emits an audible signal if discharging a batch with out-of-t olerance component weights. En sure that this signal is loud enough to hear throughout the plant area under normal oper ating conditions.

(4)Provide adjustable timing devices to control individual component batching and mixing operations.

Provide auxiliary interlock cuto ff circuits necessary to stop a utomatic cycling whenever an weighing error exceeding a specified tolerance occurs or when another pa rt of the control system malfunctions.

(5)Ensure that the batching system automatic control can stop the cycle in the underweight check

position and the overweight check position for each material to check tolerance limits.

(6)Ensure that the scale system i s equipped with a device that ap plies pressure to a scale lever to

simulate batching operations for tolerance checks.

(7)Consistently deliver materials within the full range of batch sizes within the following tolerances:

MATERIAL PERCENT OF TOTAL MATERIAL BATCH WEIGHT Coarse aggr egate .............................................. ............................................................... ............................ + 1.0 Fine aggr egate ................................................ ............................................................... .............................. + 1.0 Aggregate for use with salvaged or reclaimed pavement materials .............................................................. + 1.5 Mineral filler ................................................ ............................................................... ................................... + 0.5 Salvaged or reclaimed aspha ltic pavement material ............. ............................................................... ........ + 1.5 Asphaltic m aterial ............................................ ............................................................... .............................. + 0.1 Zero return for aggregate .............................................................................................................................. + 0.5 Zero return for salvaged or reclaimed material ................ ............................................................... .............. + 0.5 Zero return for asph altic material ............................ ............................................................... ....................... + 0.1

Effective with the December 2018 Letting 167 2019 Standard Spec ifications (8) Unless providing separate tolerance controls for batching mine ral filler, reduce aggr egate tolerances to +/- 0.5 percent for aggr egates delivered before the filler.

(9)Ensure that the total weight o f the batch does not vary by mor e than +/- 2.0 percent of the designated

batch weight.

(10)Ensure that the electrical cir cuits for the above delivery tolerances of each cutoff interlock are capable

of providing the total span for the full allowable tolerance fo r maximum batch size. Provide tolerance controls automatically or manua lly adjustable to provide spans suitable for less than full-size batches. Ensure that the automatic controls and interlock cutoff circuits are consistently coordinated with the batching scale or meter within an accuracy of 0.2 percent of th e scale or meter nominal capacity[1] throughout the full range of the batch sizes. [1] Nominal capacity of a scale is defined as the maximum quantity which the scale or meter can measure.

(11)If the automatic control or moni toring systems break down, the contractor may operate the plant

manually for up to 2 working days. 450.3.1.1.3 Recording Batch Weights

(1)On contracts involving 10,000 tons or more of asphaltic mixtures, unless the contractor elects to

record truck loads as provided in 450.3.1.1.4, produce an automatic digital record for each batch indicating the proportions of each aggregate component, mineral filler, and asphaltic material.

(2)Provide a digital recorder that can print multiple copies of m ixture reports that give the total weight of

asphaltic mixture and asphalti c material both per load and per batch. Include weights of the individual aggregates and fillers. Reports need not provide tare weight an d may use accumulative weights. Ensure that reported weights are accurate within +/- 1 kg/500 k g. Allow sufficient time for the scale to come to rest before printing each weight.

(3)The contractor may use mixture storage silos with digital reco rder equipped batch plants if the

department determines the storag e silo output is coordinated wi th the recorded batch weights.

(4)If the recording syst em breaks down, the c ontractor may operat e the plant without automatic recording

for up to 2 working days. 450.3.1.1.4 Recording Truck Loads

(1)If not using automatic batch recording, install a digital reco rder as part of the platfo rm truck or storage

silo scales. Ensure that the reco rder can produce a printed dig ital record of at least the gross or net weights of delivery trucks. Provide gross, tare, net weights, l oad count, and the cumulative tonnage; the date, time, ticket number, Wis DOT project ID, and mix 250 n umber; and the mix type including the traffic, binder, and mix designation codes specified in 460.3.1 . Ensure that scales cannot be manually manipulated during the printing pr ocess. Provide an interlock t o prevent printing until the scales come to rest. Size the scales and rec order to accurately weigh the h eaviest loaded trucks o r tractor-trailers hauling asphaltic mixture. Ensure that recorded weights are acc urate to within 0.1 percent of the nominal capacity of the scale.

(2)Ensure that tickets identify additives not included in the mix design submittal or cold weather paving

plan. Indicate on the ticket if the mixture is placed under a c old weather paving plan. 450.3.1.2 Asphaltic Mixture Hauling Vehicles

(1)Provide trucks for hauling asp haltic mixtures with tight, clea n, and smooth boxes. The contractor may

thinly coat boxes with a rel ease agent chosen from the departme nt's APL. Drain excess release agent after coating. Equip each box wit h a cover big enough to protec t the mixture. Do not use trucks that show oil leaks of any magnitude. 450.3.1.3 Transfer Devices

(1)Ensure that transfer devices hav e surge bin ca pacity adequate to pave continuously at a uniform

speed. If maintaining uniform and continuous paving, the engineer may allow the contractor to omit the surge bin. Do not use devices tha t cause vibrations or other mo tion that adversely affect the finished ride. 450.3.1.4 Pavers

(1)Ensure that the screed or strik e-off assembly produces a finished surface of the required evenness

and texture without tearing, shoving, or gouging the mixture. U se a screed adjustable for the required crown and cross-section of the finished pavement.

(2)Ensure that pavers are equipped with an activated screed or st rike-off assembly and use activation at

all times during paving unless the engineer allows otherwise. D o not extend the screed with one or more static extensions totali ng more than 12 inches at either screed end, except at the shoulder end for paving shoulders.

Effective with the December 2018 Letting 168 2019 Standard Spec ifications (3) Provide pavers with department -approved automatics that contro l the elevation and slope of the screed. The department will not require automatic controls when paving entrances, approaches, side road connections, small irregular areas, or if the engineer det ermines using automatic controls is impracticable. Use both grade an d slope controls whenever autom atics are required, except the engineer may waive the longitudi nal or grade control requiremen t for the final surface. Ensure that the operator can adjust or vary the slope throughout super elevated curves and transitions. Also ensure that the system allows the sensor to operate on either side of the paver.

(4)If automatics break down, the co ntractor may pave under manual control only until the end of that

working day. 450.3.1.5 Compaction Equipment

(1)Ensure rollers are in good mech anical condition, capable of operating both forwards and backwards,

and the operating mechanism allo ws for starting, stopping, or r eversing direction in a smooth manner, without loosening or distorti ng the surface being rolled.

(2)Equip rollers with a drum or ti re lubricator. Do not lubricate with petroleum or tar products.

450.3.2 Constructing Asphaltic Mixtures 450.3.2.1 General 450.3.2.1.1 Preparation and Paving Operations

(1)Do not place asphaltic mixture when the air temperature approx imately 3 feet above grade, in shade,

and away from artificial heats ources is less than 36 F for upper layers or 32 F for lower layers unless the engineer allows in writing. T he contractor should place HMA pavement for projects in the northern asphalt zone between May 1 and Oc tober 15 inclusive and for pro jects in the southern asphalt zone between April 15 and November 1 inclusive. CMM 4-53 figure 2 defines asphalt zones. Notify the engineer at least one business day before paving.

(2)Unless the contract specifies o therwise, conform to the following:

- Keep the road open to all traffic during construction. - Prepare the existing foundation for treatment as specified in 211. - Incorporate loose roadbed ag gregate as a part of preparing th e foundation, in shoulder construction, or dispose of as the engineer approves.

(3)Place asphaltic mixture only on a prepared, firm, and compacte d base, foundation layer, or existing

pavement substantially surface-d ry and free of loose and foreig n material. Do not place over frozen subgrade or base, or where the roadbed is unstable. 450.3.2.1.2 Cold Weather Paving 450.3.2.1.2.1 General

(1)Conform to these cold weather paving provisions for work performed under the following:

- The 460 HMA Pavement bid items. - The 465 Asphaltic Surface bid items. - Special provisions that requi re placing mixture conforming to the contract requirements under 460 for HMA pavement or under 465 for asphaltic surface. 450.3.2.1.2.2 Cold Weather Paving Plan

(1)Submit a written cold weather paving plan to the engineer at t he preconstruction meeting. In that plan

outline material, operational, and equipment changes for paving when the air temperature approximately 3 feet above grad e, in shade, and away from artif icial heat sources is less than 40 F. Include the following: - Use a department-accepted HMA mi x design that incorporates a warm mix additive from the department's APL. Do not use a foaming process t hat introduces water into the m ix. - Identify the warm mix additive and dosage rate. - Identify modifications to the compaction process and when to use them.

(2)Engineer written acceptance is required for the cold weather p aving plan. Engineer acceptance of the

plan does not relieve the contractor of responsibility for the quality of HMA pavement placed in cold weather except as specified in 450.5.2(3) . 450.3.2.1.2.3 Cold Weather Paving Operations

(1)Do not place asphaltic mixture when the air temperature approx imately 3 feet above grade, in shade,

and away from artificial heats ources is less than 40 F unless a valid engineer-accepted cold weather paving plan is in effect.

Effective with the December 2018 Letting 169 2019 Standard Spec ifications (2) If the national weather service forecast fo r the construction area predicts ambient air temperature less than 40 F at the projected time o f paving within the next 24 ho urs, confirm or submit revisions to the cold weather paving plan for engi neer validation. Update the plan as required to accommodate the conditions anticipated for t he next day's operations. Upon vali dation of the plan, the engineer will allow paving for the next day. Once in effect, pave conforming to the engineer-accepted cold weather paving plan for the balance of that w ork day or shift regardless of the temperature at the time of paving. 450.3.2.2 Preparing and Storing Mixtures

(1)Heat and combine aggregate and asphaltic material to produce a mixture within the temperature range

the mixture design specifies when discharged from the mixer. Mi x until achieving a homogeneous mixture with uniformly coated aggregate. The contractor may sto re the mixture in silos. 450.3.2.3 Transporting and Delivering Mixtures

(1)Deliver the mixture to the paver receiving hopper at a temperature within 20 F of the temperature the

asphaltic material supplier recommends. Cover loads during incl ement weather or when the ambient air temperature falls below 65 F.

(2)If depositing asphaltic mixtur e on the roadway, provide equipment to pick up substantially all of the

asphaltic mixture from the roadway and load it directly into th e paver receiving hopper. Use either a device integral to the paver or in termediate transfer equipment . 450.3.2.4 Correcting Base

(1)Before placing asphaltic base or surface courses, correct the existing pavement by filling potholes,

sags, and depressions; altering t he existing crown; or other co rrections the engineer requires. Place asphaltic lower layer mixtures where and as the engineer directs. The contractor m ay hand place or use blade graders or mechanical spreaders to place mixture used for wedging, leveling layers, or filling holes. Feather the mixture out to become co-planar with adjoini ng areas and, unless the engineer directs otherwise, compact uniformly as specified in 450.3.2.6.2 . 450.3.2.5 Spreading and Finishing Mixture

(1)Place asphaltic mixtures in layers to the typical sections the plans show with self -propelled pavers.

Pave at a constant speed, appropriate for the paver and mixture , that ensures uniform spreading and strike-off with a smooth, dense te xture and no tearing or segre gation. Do not pave faster than the average delivery rate of asphalti c mixture to ensure, as nearly as possible, continuous paving.

(2)If placing the initial lane of a given layer, sense off a tigh t string line, a mobile string line, or a traveling

straightedge whichever the engineer approves for the specific f ield conditions. On subsequent lanes of the layer, the contractor may sense off the adjacent lane surface.

(3)Avoid raking over machine spread and finished material on surf ace courses to the extent possible to

prevent segregation.

(4)The contractor may spread material by hand in areas not accessible to pavers. Dump material outside

the placement area, spread into place with shovels, and shape to the required grade and contour with rakes and lutes. Do not rake material from a pile of dumped mat erial.

(5)Do not haul over any portion of a placed layer until after the final rolling is complete on that portion.

(6)If a longitudinal joint other than the notched wedge joint is constructed, place multilane pavement so

that each day's placement in a ll lanes ends at the same station , unless the engineer directs or allows otherwise. 450.3.2.6 Compaction 450.3.2.6.1 General

(1)Unless the contract specifies o therwise for the particular typ e of work, compact using the ordinary

compaction procedure. After sp reading and strike-off and while still hot, compact eac h layer thoroughly and uniformly by rolling. Roll during daylight hours unless pro viding artificial light the engineer finds satisfactory. Use the appropriate number of rollers to achieve the specified compaction, surface finish, and smoothness requirements. Ensure that the compacted surface is smooth and true to the established crown and grade.

(2)Roll the entire surface until ac hieving the specified compacti on and, to the extent practicable, eliminate

roller marks. If turning or rever sing the roller, or other operations, causes any scuffing or displacement, immediately correct the damage an d revise the rolling procedure to prevent further damage. Keep roller wheels moistened to keep mixture from sticking to them. Do not use excess water. Do not disturb the line and gr ade elevation of edges of the asphaltic pavement or surfacing.

Effective with the December 2018 Letting 170 2019 Standard Spec ifications (3) Along forms, curbs, headers, wal ls, and at other places not ac cessible to the roller, compact the mixture thoroughly with hot hand tampers or mechanical tampers giving equivalent compression. On depressed areas, use a trench ro ller or other engineer-approved equipment.

(4)Remove and replace material t hat is loose and broken, mixed wi th dirt, or is otherwise unacceptable

with fresh hot mixture. Also remo ve and replace areas with exce ss asphaltic material. Compact replaced mixture immediately flush with the adjacent placement. 450.3.2.6.2 Ordinary Compaction

(1)Unless the contract specifies otherwise, compact patching, lev eling, and wedging layers of asphaltic

pavement or surfacing; all layers of plant mixed asphaltic base and base widening; driveways; and other non-traffic areas until no further appreciable consolidation is visible under the action of the compaction equipment. Use 2 or mo re rollers per paver if placin g more than approximately 165 tons of mixture per hour.

(2)The engineer will assess the comp acted density using the metho ds specified for the particular type of

work. 450.3.2.7 Applying Tack Coat

(1)Apply tack coat as specified in 455.3.2 to each layer of a plant-mix ed asphaltic base or pavement that

will be overlaid with asphaltic mixture under the same contract . 450.3.2.8 Jointing

(1)Place all layers as continuously as possible without joints. D o not roll over an un protected end of

freshly laid mixture unless in terrupting placement long enough for the mixture to cool. If interrupting placement, ensure proper bond with the new surface. Form joints by cutting back on the previous run to expose the full depth of the la yer. After resuming placement , place the fresh mixture against the joint to form intimate contact and be co-planar with the previously completed work after consolidation.

(2)Where placing against existing HMA pavement, cut back the exis ting mat to form a full-depth butt joint.

(3)Construct notched wedge longit udinal joints for mainline pavin g if the pavement thickness conforms to

the minimums specified in 460.3.2 , unless the engineer directs or allows an alternate joint. Taper each layer at a slope no greater than 12:1. Extend the taper beyond the normal lane width, or as the engineer directs. Ensure that tapers for all layers directly ov erlap and slope in the same direction.

(4)Place a 1/2 to one inch vertica l notch after compaction at the top of tapers on all layers. Place the

finished longitudinal joint lin e of the upper layer at the pavement centerline for 2-lane roadways, or at the lane lines if the roadway has more than 2 lanes.

(5)Construct the tapered portion of each laye r using an engineer- approved strike-off device that will

provide a uniform slope and will not restrict the main screed. Apply a weighted steel side roller wheel, as wide as the taper, to the tapered section. Compact the initial taper section to as near the final density as possible. Apply a ta ck coat to the taper surface bef ore placing the adjacent lane.

(6)Clean longitudinal and transverse joints coated with dust and, if necessary, paint with hot asphaltic

material, a cutback, or emulsified asphalt to ensure a tightly bonded, sealed joint. 450.3.2.9 Surface Requirements

(1)Test the surface at engineer-se lected locations with a 10-foot straightedge or other engineer-specified

device. Ensure that upper layers show no variation greater than 1/8 inch between any 2 surface contacts. Ensure that lower layers, shoulder surfacing, and surfacing on temporary connections and bypasses show no variation greater than 1/4 inch between any 2 surface contacts.

(2)Remove and replace or otherwise correct, using engineer-approved methods, humps or depressions

exceeding the specified tolerance. 450.3.2.10 Paving Shoulders

(1)Conform to the other requirements under 450.3.2 except, if con structing shoulders separately and the

placement width is too narrow to accommodate the required pavers and rollers, the contractor may use engineer-approved alternat e spreading and compaction equipm ent. Alternate equipment must be capable of satisfactorily layi ng mixture to the required width, thickness, texture, and smoothness. 450.3.2.11 Safety EdgeSM

(1)Construct safety edge monolithi cally with and extending beyond the edge of pavements that have no

paved shoulder, have paved shoulde rs 3 feet wide or less, and a t other locations the plans show. Safety edge is not required on edges that abut other HMA or con crete elements or where the engineer excludes for constructability issues.

Effective with the December 2018 Letting 171 2019 Standard Spec ifications (2) Compact conforming to 450.3.2.6 . Ensure that after final rollin g the safety edge angle is with in the tolerances the plans show. The contractor may use full depth sa wing to remove formed edges integrally placed with pavemen t where safety edge is not required.

(3)Use a paver equipped with a wedge maker from the department's APL capable of constructing the

specified edge cross-section. Do not use a single plate strike off.

(4)Place the finished shoulder material to the top of the safety edge conforming to 305.3.3 .

450.3.3 Maintaining the Work

(1)Protect and repair the prepared foundation, tack coat, base, p aved traffic lanes, shoulders, and seal

coat. Correct rich or bleeding areas, breaks, raveled spots, or other nonconforming areas in the paved surface.

450.4Measurement

(1)The department will measure asphaltic mixtures by the ton of mixed aggregate and asphaltic material

incorporated in the work unless the measurement subsection for a particular application specifies otherwise. Provide the engineer with weigh tickets showing the net weight of each load of material delivered. The department or department-authorized testing firms or agencies will test the contractor's truck, storage silo, or plant scales.

(2)For minor quantities of mixtures and if the engineer approves, the contractor may report batch weights

from plant scales as described in 450.3.1.1.1, instead of truck or stora ge silo scale weights.

(3)The department will measure HMA Cold Weather Paving by the ton of HMA mixture placed

conforming to an engineer-accepted cold weather paving plan.

450.5Payment

450.5.1 General

(1)All costs of furnishing, maintai ning, and operating the truck scale or other weighing equipment and

furnishing the weigh tickets are incidental to the contract.

(2)Nonconforming material allowed to remain in place is subject to price adjustment under 105.3.2.

(3)Full-depth sawing to remove in tegrally placed safety edge wher e not required is incidental to the

contract.

(4)The contractor is responsible for the quality of HMA placed in cold weather.

450.5.2 Cold Weather Paving

(1)The department will pay for measured quantities at the contrac t unit price under the following bid

items: ITEM NUMBER DESCRIPTION UNIT

450.4000 HMA Cold Weather Paving TON

(2)Payment for HMA Cold Weather Paving is full compensation for a dditional materials and equipment

specified for cold weather paving under 450.3.2.1.2 including costs for preparing, administering, and following the contractor's cold weather paving plan. The department will not pay for HMA Cold Weather Paving for HMA placed as follows: - If the lot density is less than the minimum specified in table 460-3 for mixture placed under 460. - On days when the department is assessing liquidated damages.

(3)If because of an excusable compensable delay under 108.10.3 , the engineer directs the contractor to

pave when the temperature is less than 36 F for the upper layer or less than 32 F for lower layers, the department: - Will relieve the contractor o f responsibility for damage and defects the engineer attrib utes to cold weather paving. - Will not assess disincentives for density or ride.

(4)If HMA pavement is placed under 450.3.2.1.2 and the HMA Cold Weather Paving bid item is not in the

contract, the department will pay for the additional costs spec ified in 450.5.2(2) as extra work. The department will pay separately for providing HMA pavement and HMA surface under 460.5 , 465.5 , and the contract special provisions. Effective with the December 2018 Letting 172 2019 Standard Spec ifications Section 455 Asphaltic Materials

455.1Description

(1)This section describes asphalti c materials including asphaltic binders, cements, cut-back asphalts, emulsified asphalts, and similar products. This section also de scribes applying tack coat.

455.2Materials

455.2.1 General (1)Furnish asphaltic material that meets the minimum PG binder gr ade the contract specifies. Furnish binder with an S designation unless the contract specifies othe rwise. Ensure that the material furnished conforms to the department’s Combined State Binder Gr oup Method of Acceptance for Asphalt Binders available at: https://wisconsindot.gov/Documents/doing-bus/eng-consultants/cnslt-rsrces/tools/qmp/csbg-policy.pdf 455.2.2 Sampling 455.2.2.1 PG Asphalts (1)Sample according to the department’s Combined State Binder Gro up Method of Acceptance for Asphalt Binders available at: https://wisconsindot.gov/Documents/doing-bus/eng-consultants/cnslt-rsrces/tools/qmp/csbg-policy.pdf 455.2.2.2 MC, SC, and Emulsified Asphalts (1)Sample asphaltic material at t he job site either before or during unloading. Obtain the engineer's approval of sampling methods and have the engineer observe the sampling. If sampling outside established job working hours , arrange for a department represe ntative to be present. (2)Obtain representativ e samples at the frequen cy specified in CMM 8-50 exhibit 1 and according to AASHTO R66 excep t as follows: - If bleeding through a drain-cock in the tr ansfer line, allow at least 5 minutes between samples. - If sampling from a valve ins talled in the si de or end of the delivery vehicle tank, the valve must be between the quarter points of the tank’s v ertical diameter. Draw off an d discard enough material to clear the intake line of material from previ ous loads before sampling. (3)Use only clean, dry sample cont ainers free from cleaning oil o r other contamination. Do not contaminate samples. Tightlys eal, mark for identification, and submit to the engineer immediately after filling. The department’s laboratory will test the material. 455.2.3 Testing455.2.3.1 PG Asphalts (1)Test according to the department’s Combined State Binder Group Method of Acceptance for Asphalt Binders available at: https://wisconsindot.gov/Documents/doing-bus/eng-consultants/cnslt-rsrces/tools/qmp/csbg-policy.pdf 455.2.3.2 MC, SC, and Emulsified Asphalts (1)Test MC and SC materials according to the following: TEST AASHTO ASTM Flash point, open tag T 79 ___ Flash point, Cle veland cup T 48 ASTM D92 Kinematic viscosity T 201 ASTM D2170 Distillation T 78 AST M D402 Penetration T 49 ASTM D5 Ductility T 51 ___ S olubility in trichloroethylene T 44 ASTM D2042 Water T 55 ASTM D95 (2)Test emulsified asphalts according to AASHTO T59. 455.2.4 Physical Properties 455.2.4.1 PG Asphalts (1)Furnish material conforming to the department's Combined State Binder Group Method of Acceptance for Asphalt Binders available at: https://wisconsindot.gov/Documents/doing-bus/eng-consultants/cnslt-rsrces/tools/qmp/csbg-policy.pdf 455.2.4.2 MC and SC Asphalts (1)Furnish material conforming to the following:

Source: Wisconsin Standard Specifications for Highway and Structure Construction, 2019 Edition. Pages 174–180 of 601.

← Previous

420 Diamond Grinding

455 Asphaltic Materials