- 333 - SECTION 508 -- JOINT SEALING - ASPHALT TO CONCRETE
508.01 Description
1.This work shall consist of sealing joints between asphaltic concrete surfacing and Portland cement concrete pavement.
508.02 Material Requirements
1.Rubber-asphalt joint filler shall be a mixture of, paving grade asphalt binder, vulcanized recycled rubber, and other additives such as polymer modifier(s).
2.The mixture, when heated in accordance with the supplier'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.
3.The joint filler shall contain no solvents, shall be self-leveling, and shall cure upon cooling to a consistenc y that will not be tracked by traffic.
4.The joint filler shall be suitable for melting and application with a conventional melter-applicator unit.
5.The joint filler shall be a pre-re acted blend of product. The joint filler 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.
6.When heated in accordance with ASTM D5167 to the maximum heating temperature, the joint filler shall meet the Nebraska Specifications of CR18B, as noted below in Table 508.01.
508.02 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 Section 1002 of the NDOT Standar d Specifications. The design is amended to not include flyash. All ot her specifications for Portland Cement Concrete will apply.
2.There shall be no failure in adhesion, nor formation of an oily exudate at the interface between the hot pour filler and the asphalt concrete specimen, nor softening or other deleterious effects on the asphaltic concrete or hot pour filler.
3.Due to the interlace variat ions of the asphalt/rubber matrix, a 2% testing tolerance deviation from specification is allowable.
a.Sample conditioning, prep aration, and heating shall be in accordance with ASTM D5167 with the following exceptions:
1.The following sentence of 8. 1.2, “Also, if present, remove 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 samp le section shall be left in place.
2.The last sentence of 8.1. 2 is void and superseded by the following: The entire vertical section which has been cut, shall be placed into the pot for melting.
3.The Section of 8.2.2.1 “Solid Materials” is void.
4.The Section of 8.2.3 is void and superseded by the 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.
5.The Section of 8.2.4.1 is void and superseded by the 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 verifi ed in accordance with Section 6.1.7 to ensure conformance with the specifi ed 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.
6.The Section of 8.2.4.2 is void. b. ASTM D5329 shall include the following changes: (1) Sections 6.4 and 12.4 “Specimen Preparation” shall have the reference of “177 ml (6 oz.)” replaced with “3 oz.”
2.Section 6 “Cone Penetration, Non-Immersed” shall be superseded with the following exceptions:
i.Section 6.5 “Procedure” is void and superseded by 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 representat ive of the material itself, and is free of dust, water, bubbles, or other foreign materi al. Due to the high rubber content, ensure that the cone is not placed on a piece of rubber. (ii) Section 6.6 “Report” is void and superseded by the following: Record the value as penetra tion of the specimen in dmm units.
3.Section 12 “Resilience” shall be superseded with the following changes:
i.Section 12.5 “Procedu re”, void the sentence “Make 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.” (ii) Section 12.6 “Report” is void. 7. The vulcanized recycled ground rubber shall be free of wire, fabric, 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.
8.Acceptance of the manufacture d material will be based on pre- approval by either on or off-site sampling. Acceptable hot pour sealant lots are listed on the Department’s Approved Products List.
508.02 Joint Sealing - Asphalt to Concrete
- 336 - a. Department on-site field sampling shall be in accordance with the Department’s Materials Sampling Guide.
b.Off-site (Proxy) sampling shall be in accordance with ASTM D5078.
1.Proxy sampling shall be overseen by an outside party 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 signat ure 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.
2.For convenience in both sampling and shipping samples, sample containers smaller than a manufacturer’s usual production containers are allowed, as long as t he sample is a minimum of 1500 grams.
3.Samples shall be sent to the Department Laboratory, or 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.
9.The hot pour rubber asphalt joint filler can be packaged in either cardboard box or wholly-meltable type containers.
a.Cardboard box containers shall be manufactured from double 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 prohibit ed for closing the lids of the boxes. Tape or other like material is acceptable.
1.The rubber asphalt joint filler shall be in meltable [300°F (149oC)] polyethylene bags.
b.Wholly-meltable type containers, and any of their components, 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.
1.The wholly-melted and integrated container must not adversely affect the test specifications of the rubber asphalt joint filler.
c.Each individual container shall include information regarding 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.
508.03 Construction Methods
1.The Contractor shall prepare and construct the joint between the 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.
2.The Contractor shall apply seal ant in accordance with the sealant 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
1.Longitudinal joint sealing will be measured by the station along the roadway centerline for each joint between the beginning and ending points of the work.
2.Transverse and all other joints are measured by the linear foot (meter) along the joint, and the total length is converted to an equivalent number of stations.
508.05 Basis of Payment
1.P a y I t e m P a y U n i t Joint Sealing - Asphalt to Concrete Station (Sta) [ S t a t i o n ( S t a M ) ]
2.When sealant materials comply wi th the Specificat ion requirements, joint sealing shall be paid for at the contract unit price per Station (StaM).
a.When testing of on-site seal ant materials is outside of the 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 1.00 Deviation of up to (+/-) 5.0% 0.95 Deviation of (+/-) 5.1% to 10.0% 0.90 Deviation of (+/-) 10.1% to 15.0% 0.80 Deviation of (+/-) 15.1% to 20.0% 0.70 Deviation of (+/-) 20.1% to 25.0% 0.40 or Reject Deviation of 25.1% or greater
1.When the specificati on requirement is stated as a 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.
2.When more than one specified property exceeds specification tolerances, the single larg est pay factor reduction will be the one applied.
3.Material not meeting a Pass/Fail requirement falls under the Pay Factor of 0.40 or reject.
b.If the material is found to be out of specificati on, the material 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.
c.If the pay factor is less t han 1.00 and the material has been incorporated in work which is allowed to remain in place, the pay factor for the material is determined by the above pay factor table.
d.Material that exhibits unac ceptable field application will be rejected and removed from the approved products list. Material already used shall be removed and replaced at no cost to the Department.
508.05 Joint Sealing - Asphalt to Concrete
- 338 - 3. When disputes arise in test resu lts, the Department will select an independent laboratory for referee test ing 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.
a.Only the Contractor can init iate dispute resolution, and request 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.
b.If the independent lab’s tests indicate failing results and pay 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 meets s 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.
4.Payment is full compensation for all work described in this Section. - 339 - SECTION 509 -- BITUMINOUS SAND BASE COURSE
509.01 Description
1.This work will consist of furnishing all materials and constructing a 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.
509.02 Material Requirements
1.All materials shall be furnished by the Contractor and shall conform 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. Liquid Asph alts .................. 1030
2.Emulsified asphalt for use in bituminous sand base course shall be HFE-300 or CM-4 conforming to the requirements of Sections 1031 and 1032.
3.The type of asphaltic material to be applied to the bituminous 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.
4.Mineral aggregate shall m eet gradation requirements in Table 1033.05.
509.03 Equipment
1.a. Blade machines shall be equipped with pneumatic tires and designed, constructed, and maintained to insure thorough mixing of the asphaltic materials and aggregates and uniform spreading and finishing of the mixed materials.
b.Blade machines shall be equipped with suitable moldboards.
c.Blade machines that caus e corrugations or other damage to the finished base are unacceptable.
2.a. Traveling mixing plants shall be designed to prevent the loss of any filler material during mixing.
b.Traveling mixing plants shall be designed to deliver thoroughly mixed material in a uniform manner without damage to the subgrade or mixing surface.
c.All traveling mixing plants shall be equipped with sufficient valves and a by-pass in the oil line between the pump and the spray bar to help calibrate the pump's output.
d.The traveling mixing plants shall be equipped with a thermometer well and thermometer of sufficient range to accurately determine the temperature of the asphaltic material.
e.The plants shall also be equipped with a meter that will show 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).
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 367–372 of 1,048.