508JOINT SEALING - ASPHALT TO CONCRETE

- 333 - SECTION 508 -- JOINT SEALING - ASPHALT TO CONCRETE

508.01Description

surfacing and Portland cement concrete pavement.

508.02Material Requirements

asphalt binder, vulcanized recycled rubber, and other additives such as polymer modifier(s).

instructions, shall produce an easily applied, flexible, and adhesive compound that will effectively seal join ts between Portland cement concrete and the asphaltic concrete under typi cal Nebraska climatic conditions.

shall cure upon cooling to a consistenc y that will not be tracked by traffic.

conventional melter-applicator unit.

shall not require additional heating ti me for application after it has reached the manufacturer’s recommended mi nimum application temperature. New joint filler may be added to the material that has already been heated to the minimum application temperature.

heating temperature, the joint filler shall meet the Nebraska Specifications of CR18B, as noted below in Table 508.01.

Joint Sealing - Asphalt to Concrete

- 334 - Table 508.01 Test Specification Cone Penetration, non-immersed, 77° F (25° C) (ASTM D5329) 50 – 90 dmm Flow, 140° F (60° C), 5 hours (ASTM D5329) 5.0 mm max. Resilience, 77° F (25° C) (ASTM D5329) 25 – 60% Bond, non-immersed, -20° F (-29° C) 50% extension (1/2” specimen) (ASTM D5329)(1) Pass 3 cycles (ASTM D6690, Table 1, Note A) Flexibility, Mandrel Bend, -29° F (-34° C), 1” mandrel, 90 degrees, 10 sec. Sample strip size is 3” long, 1” wide, 0.125” thick. (ASTM D3111, modified) Minimum 2 of 3 specimens shall pass. Asphalt Compatibility, 140° F (60° C), 72 hours (ASTM D5329) Pass(2) Recycled Rubber Content (by weight of asphaltic components). Extraction by ASTM D2172, Method A 18% Minimum(3) Notes: (1) Concrete blocks will be constructed by the Department. The materials used are a common design in Nebraska concrete paving specifications. The design is a 47B concrete mixture as specified in amended to not include flyash. All ot her specifications for Portland Cement Concrete will apply.

concrete specimen, nor softening or other deleterious effects on the asphaltic concrete or hot pour filler.

a 2% testing tolerance deviation from specification is allowable.

accordance with ASTM D5167 with the following exceptions:

container liner by cutting it away”, is void and superseded by the following: Also, if present, as much of the polyethylene bag as possible, shall be removed by cutting it away. Wholly-meltable type container in contact with the sample section shall be left in place.

following: The entire vertical section which has been cut, shall be placed into the pot for melting.

following: After the solid segment is added to the melter, the material shall be allowed to minimally melt to a uniform viscous state suitable for the installation of the stirrer or paddle. The sample shall then be stirred for one Joint Sealing - Asphalt to Concrete 508.02

- 335 - full hour. The oil bath temperature shall be regulated to bring the material to the maximum heating temperature within the one hour of stirring.

following: During the one full hour of stirring, check the temperature of the material at maximum 15 minute intervals using a Type K thermocouple with the calibration verified in accordance with Section 6.1.7 to ensure conformance with the specified temperature requirements. Stop the mechanical stirrer when measuring temperatures. If material temperatures ever exceed the maximum heating tem perature, or ever drop below the minimum application temperature after the maximum heating temperature was reached, discard the sample and re-do the heating. Maintain appropriate records of times and temperatures to verify conformance with specification requirements.

the reference of “177 ml (6 oz.)” replaced with “3 oz.”

superseded with the following exceptions:

the following: Place the specimen in a water bath maintained at 77 +/- 0.2 oF (25 +/- 0.1oC) for two hours immediately before testing. Remove the specimen from the bath and dry the su rface by shaking gently to remove free water from the surface of the s pecimen. Using the apparatus described in Section 6.3, make one determinati on at or near the center of the specimen. Take care to ensure the cone point is placed on a point in the specimen that is representative of the material itself, and is free of dust, water, bubbles, or other foreign material. Due to the high rubber content, ensure that the cone is not placed on a piece of rubber.

following: Record the value as penetration of the specimen in dmm units.

following changes:

determinations at three points equally sp aced from each other and less than 13mm (1/2 inch) from the container rim” and supersede with the sentence “Make one determination at or near the center of the tin.”

or other contaminating materials. T he gradation shall be 95-100% passing the No. 10 (2.00mm) sieve, 35-55% pas sing the No. 20 (850 µm) sieve, and 0-25% passing the No. 40 (425 µm) sieve.

approval by either on or off-site sampling. Acceptable hot pour sealant lots are listed on the Department’s Approved Products List.

Joint Sealing - Asphalt to Concrete

- 336 - a. Department on-site field sampling shall be in accordance with the Department’s Materials Sampling Guide.

D5078.

approved by the Department, preferably another DOT Agency. Proxy samples shall include a manufacturer’s Certificate of Compliance. Proxy samples shall also include a dated signature of origin by the Representative that is not affiliated with the ma nufacturer, and can either be on the Certificate of Complianc e, or separate letter.

sample containers smaller than a manufacturer’s usual production containers are allowed, as long as t he sample is a minimum of 1500 grams.

alternatively, sent to a Department approved independent laboratory for testing which will be at no cost to the Department. If a Department approved independent laboratory is used, the Contractor sha ll notify the Department Laboratory so that concrete blo cks for the Bond testing can be sent.

cardboard box or wholly-meltable type containers.

wall kraft board producing a minimum bursting test certification of 350 PSI (241 N/cm2) and using water-resistant adhesives. The use of metal staples or fasteners of any kind will be prohibited for closing the lids of the boxes. Tape or other like material is acceptable.

(149oC)] polyethylene bags.

shall be fully meltable and integrationa l with the hot pour rubber asphalt joint filler by the time the manufacturer’s minimum application temperature is reached.

adversely affect the test specifications of the rubber asphalt joint filler.

manufacturer, lot or batch number , type of product, minimum application temperature, and maximum heating te mperature. The maximum heating temperature must be at least 20oF (11oC) higher than the minimum application temperature.

508.03Construction Methods

concrete pavement and asphaltic concrete to the dimensions of the typical sections shown in the contract. The full depth of the cut shall be cleaned by routing or any other method which results in a clean cut.

manufacturer's recommended procedures. In no case shall the temperature of the sealant fall below the minimum, or exceed the maximum recommended by the manufacturer during application. Joint Sealing - Asphalt to Concrete 508.05

- 337 - 508.04 -- Method of Measurement

roadway centerline for each joint between the beginning and ending points of the work.

number of stations.

508.05Basis of Payment

Joint Sealing - Asphalt to Concrete Station (Sta) [ S t a t i o n ( S t a M ) ]

joint sealing shall be paid for at the contract unit price per Station (StaM).

specified property ranges, joint sealing sh all be paid for at the contract unit price multiplied by the Pay Factors in Table 508.02. Table 508.02 Pay Factor Specified Property

1.00Deviation of up to (+/-) 5.0%

0.95Deviation of (+/-) 5.1% to 10.0%

0.90Deviation of (+/-) 10.1% to 15.0%

0.80Deviation of (+/-) 15.1% to 20.0%

0.70Deviation of (+/-) 20.1% to 25.0%

0.40 or Reject Deviation of 25.1% or greater

percentage, the test result deviation from the specif ication will be divided by the specification value. The resulti ng deviation percentage is then applied according to the above table.

specification tolerances, the single larg est pay factor reduction will be the one applied.

the Pay Factor of 0.40 or reject.

will be rejected if not already used. All material out of specification, regardless of pay factor, not in place will be rejected and shall be removed from the site.

incorporated in work which is allowed to remain in place, the pay factor for the material is determined by the above pay factor table.

rejected and removed from the approved products list. Material already used shall be removed and replaced at no cost to the Department.

Joint Sealing - Asphalt to Concrete

- 338 - 3. When disputes arise in test resu lts, the Department will select an independent laboratory for referee testing on the remainder of the sample. The identity of the independent labo ratory will not be revealed until the selected laboratory has completed the referee testing.

referee testing. Should the Contractor request referee testing, it shall be submitted in writing to the Department within 30 days of receiving the written notification of deficiency.

deductions equal to or greater than the Department’s, the Contractor will reimburse the Department for the cost of testing. If the independent lab’s tests indicate that the material meetss pecifications or is at a pay deduction less than the Department’s, the Department will assume the cost of testing. When the independent lab’s tests indica te a pay deduction, the lesser of the Department’s and the independent la b’s deductions will be applied.

- 339 - SECTION 509 -- BITUMINOUS SAND BASE COURSE

509.01Description

compacted base course composed of sand from the roadbed, aggregate, mineral filler, and cut-back asphalt or emulsified asphalt. Materials shall be mixed using a traveling mixing plant method or with a grader blade.

509.02Material Requirements

to the requirements in Table 509.01. Table 509.01 Material Requirements Applicable Materials Section Mineral Aggregates ........... 1033.01, 1033.02, Para. 1., 2., 5. Mineral Filler ...................... 1033.02, Para. 1., 2., 4.

HFE-300 or CM-4 conforming to the requirements of Sections 1031 and 1032.

mixture will be indicated in the contrac t. The percentage of asphaltic material to be applied to the mixture will be determined by the Materials and Research Division.

Table 1033.05.

509.03Equipment

designed, constructed, and maintained to insure thorough mixing of the asphaltic materials and aggregates and uniform spreading and finishing of the mixed materials.

the finished base are unacceptable.

any filler material during mixing.

mixed material in a uniform manner without damage to the subgrade or mixing surface.

valves and a by-pass in the oil line between the pump and the spray bar to help calibrate the pump's output.

thermometer well and thermometer of sufficient range to accurately determine the temperature of the asphaltic material.

the actual gallons (liters) delivered by the plant and a gauge that will show the rate of delivery in gallons per minute (liters per minute).