- 379 - SECTION 519 -- CRACK SEALING BITUMINOUS SURFACING
519.01 Description
1.This work shall consist of pre paring and sealing the transverse and longitudinal cracks in bitu minous surfacing at the various locations shown in the contract.
519.02 Material Requirements
1.NE-101, NE-CR18B, NE-3405, and NE-3405LM shall include the following for ASTM D5329:
a.Sections 6.4 and 12.4 “Spe cimen Preparation” shall have the reference of “177 ml (6 oz.)” replaced with “3 oz.”
b.Section 6 “Cone Penetration, Non-immersed” shall be superseded with the following exceptions:
1.Section 6.5 “Procedure” is void and superseded by the following: Place the specimen in a water bath maintained at 77 ± 0.2°F (25 ± 0.1°C) for two hours imme diately before testing.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. When testing higher rubber content sealants, ensure that the point of the cone is not placed on a piece of rubber.
2.Section 6.6 “Report” shall be amended to include “Record the value as the penetration of the specimen in dmm units.”
c.Section 12 “Resilience” shall be superseded with the following exceptions:
1.Section 12.5 “Procedure”, void the sentence “Make determinations at three points equally sp aced from each other and less than 13 mm (1/2 inch) from the container rim.” and supersede with the sentence “Make one determination at or near the center of the tin.”
2.Section 12.6 “Report” is void. 2. Packaging a. The sealant can be packaged in either cardboard box or wholly-meltable type containers.
b.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.
c.The sealant shall be in meltable [300°F (149 C)] polyethylene bags.
d.Wholly-meltable type containers, and any of their components, shall be fully meltable and integrational with the sealant by the time the manufacturer’s minimum application temperature is reached.
519.02 Crack Sealing Bituminous Surfacing
- 380 - e. The wholly-melted and integr ated container must not adversely affect the test specifications of the sealant.
f.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 20°F (11 C) higher than the minimum application temperature.
3.Sample conditioning, preparation, and heating for NE-101, NE- CR18B, NE-3405, and NE-3405LM shall be in accordance with ASTM D5167 with the following exceptions:
a.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 sample section shall be left in place.”
b.The last sentenc e 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.
c.The Section of 8.2.2.1 “Solid Materials” is void.
d.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 full hour. The oil bath temperature shall be regulated to bring the material to the maximum heating temperature within the one hour of stirring.
e.The Section of 8.2.4.1 is vo id 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 verified in accordance with Section 6.1.7 to ensure conformance with the specified te mperature 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.
f.The Section of 8.2.4.2 is void. 4. NE-101
a.The sealant shall be a mi xture of paving grade asphalt, vulcanized recycled rubber, and polymer modifier(s) that conform to the following requirements and Specifications:
1.The sealant shall be a pre-reacted blend of product. The sealant shall not require additional heating time for application after it has reached the manufacturer’s recommended minimum application Crack Sealing Bituminous Surfacing 519.02 - 381 - temperature. New material may be added to the material that has already been heated to the minimum application temperature.
2.When heated in accordance with ASTM D5167 to the maximum heating temperature, the s ealant shall meet the parameters in Table 519.01. Table 519.01 Test Specification Cone Penetration, non-immersed, 77 F (25
C.(ASTM D5329) 45-70 dmm Cone Penetration, non-immersed, 39.2 F (4C) (ASTM D5078) 30 dmm minimum Resilience, 77 F (25 C) (ASTM D5329) 30% minimum Softening Point (ASTM D36) 195 F (91C) min. Ductility, 77 F (25o C) (ASTM D113) 30 cm. minimum Asphalt Compatibility, 140o F (60o C), 72 hours (ASTM D5329) Pass (1) Bitumen Content (ASTM D4) 60% minimum Tensile Adhesion (ASTM D5329) 500% minimum Flow, 140 F (60 C), 5 hours (ASTM D5329) 3 mm. maximum Flexibility, Mandrel Bend, 0 F (-18 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. Recycled Rubber Content (by total weight of product). Extraction by ASTM D2172, Method A 10 – 15% (2) Notes:
1.There shall be no failure in adhesion, or formation of an oily exudate at the interface between t he hot pour filler and the asphalt concrete specimen, nor softening or other deleterious effects on the asphaltic concrete or hot pour filler.
2.Due to the interlace variations of the asphalt/rubber matrix, a +/- 2% testing tolerance deviation from specification is allowable.
d.The vulcanized recycled ground rubber shall be free of wire, fabric, or other contaminating mate rials. The gradation shall be 100% passing the No. 8 sieve (2.36 mm) and a maximum of 5% passing the No. 200 (75 m) sieve.
519.02 Crack Sealing Bituminous Surfacing
- 382 - 5. NE-CR18B
a.The sealant shall be a mi xture of paving grade asphalt, vulcanized recycled rubber, and other additives such as polymer modifier(s), that conform to the following requirements and Specifications:
1.The sealant shall be a pre-reacted blend of product. The sealant shall not require additional heating time for application after it has reached the manufacturer’s recommended minimum application temperature. New material may be added to the material that has already been heated to the minimum application temperature.
2.When heated in accordance with ASTM D5167 to the maximum heating temperature, the sealant shall meet the Nebraska Specifications of CR18B, as noted in Table 519.02. Table 519.02 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) 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) (1) Minimum 2 of 3 specimens shall pass. Asphalt Compatibility, 140o F (60o 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’s Concrete Laboratory. 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 Standard Specifications. The design is amended to not include flyash; all other specifications for Portland Cement Concrete apply.
2.There shall be no failure in adhesion, or formation of an oily exudate at the interface between the hot pour sealant and the asphalt concrete specimen, nor softening or other deleterious effects on the asphaltic concrete or hot pour sealant.
3.Due to the interlace variations of the asphalt/rubber matrix, a 2% testing tolerance deviation from specification is allowable.
b.The vulcanized recycled ground rubber shall be free of wire, fabric, or other contaminating materi als. The gradation shall be 95-100% passing the No. 10 (2.00 mm) sieve, 35-55% passing the No. 20 (850 m) sieve, and 0-25% passing the No. 40 (425 m) sieve. Crack Sealing Bituminous Surfacing 519.02 - 383 - 6. NE-3405
a.The sealant shall confor m to the requirements of ASTM D6690, Type II. The material shall conf orm to the requirements of Table 1, with the following exceptions.
1.The test of Bond, non-immersed, ASTM D5329, 3 specimens through 3 cycles shall be run at 0oF, (-18 oC), 100% extension.
2.The concrete blocks will be constructed by the Department’s Concrete Laboratory. 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 Standard Specifications. The design is amended to not include fly ash; all other specifications for Portland Cement Concrete apply.
7.NE-3405LM (Low Modulus)
a.The sealant shall confor m to the requirements of ASTM D6690, Type IV. The material shall conf orm to the requirements of Table 1, with the following exception:
b.The concrete blocks used in the test of Bond, non-immersed, ASTM D5329, will be constructed by the Department’s Concrete Laboratory. The materials used are a common design in Nebraska concrete paving specifications. The design is a 47B conc rete mixture as specified in Section 1002 of the Standard Spec ifications. The design is amended to not include flyash; all other specifications fo r Portland Cement Concrete apply.
8.Acceptance Requirements a. Acceptance of the manufactured material is 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.
b.Department on-site field sampling shall be in accordance with the Department’s Materials Sampling Guide.
c.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, 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 Department sha ll be notified so that concrete blocks can be sent for any required Bond testing.
519.03 Crack Sealing Bituminous Surfacing
- 384 - 519.03 -- Construction Methods
1.Preparation of Transverse and Longitudinal Cracks
a.Cracks shall be prepared as follows: (1) Cracks 3/8 inch (10 mm) or less in width shall be widened using a router to form a reservoir wh ich is 1/2 inch (12.5 mm) wide by 3/4 inch (20 mm) to 1 inch (25 mm) deep. The crack shall be thoroughly cleaned with compressed air to remove all dust, dirt, loose material, and moisture so that at the time the sealant is app lied, the crack will be clean and dry.
2.Cracks wider than 3/8 inch (10 mm) shall be cleaned for the entire crack depth using sandbl asting, or brushing and air-blowing techniques as required to provide a crack free of all dust, dirt, loose material and moisture. It may be necessary to remove incompressibles deep in the crack by gouging or plowing.
3.A hot air heat lance shall be used to warm the sidewalls of the crack immediately prior to placing the sealant.
b.The surface of the bitumin ous pavement shall be dry at the time of crack preparation and sealing operations.
c.No more than 500 linear f eet (150 m) of crack preparation shall be left unsealed after the end of each working day. The Engineer will inspect any prepared crack, left unsealed at the end of each working day to determine if they need to be recleaned prior to being sealed.
2.Sealing Transverse and Longitudinal Cracks
a.When the sealant reac hes the minimum application temperature, the crack shall be fill ed using a pressure type applicator equipped with a nozzle that will fit into the crack. The design of the pressure applicator and nozzle shall be approved by the Engineer. The crack shall be filled with sealant from the bottom up. The crack shall be slightly overfilled with sealant and squeegeed to surface level leaving a 2 to 4 inch (50 to 100 mm) width of sealant over the crack. In no case shall the temperature of the sealant fall below the minimum, or exceed the maximum recommended by the manufacturer during application.
3.Existing cracks previously routed and sealed, shall be re-routed, if applicable, and cleaned for the entire crack depth using sandblasting, or brushing and air-blowing techniques as required to provide a crack free of all dust, dirt, loose material and moistu re. It may be necessa ry to remove incompressibles deep in the crack by gouging or plowing; reseal as above. This operation also includes previous ly sealed cracks that have not been routed. The Contractor is responsible for cleaning up and discarding all removed crack sealing material and debris.
519.04 Method of Measurement
1.The work of crack sealing bituminous surfacing will be measured for payment by the linear f oot (meter) of cracks sealed.
2.Measurement shall be to the nearest foot (0.3 m), complete, in place and accepted by the Engineer. Crack Sealing Bituminous Surfacing 519.05 - 385 - 519.05 -- Basis of Payment
1.P a y I t e m P a y U n i t Crack Sealing Bituminous Surfacing Linear Feet (LF) [Meter (m)]
2.When sealant materials comply wi th the Specificat ion requirements, crack sealing shall be paid for at t he contract unit price per linear foot (meter).
a.When testing of on-site seal ant materials is outside of the specified property ranges, crack sealing sh all be paid for at the contract unit price multiplied by the Pay Factors in Table 519.03. Table 519.03 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 shall be rejected if not already used. All material out of specification, regardless of pay factor, not in place s hall be rejected and 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.
519.05 Crack Sealing Bituminous Surfacing
- 386 - 3. When disputes arise in test resu lts, the Department will select an approved independent laboratory for referee testing on the remainder of the sample. The identity of the independent laboratory will not be revealed until the selected laboratory has co mpleted the referee testing.
a.Only the Contractor can init iate dispute resolution, and request referee testing. The Contractor shall in itiate the dispute resolution in writing to the Engineer within 30 days of re ceiving the notificat ion 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 and all sealant manufacturer’s requirements. - 387 - SECTION 520 -- BITUMINOUS PATCHING OF CONCRETE PAVEMENT
520.01 Description
1.This work shall consist of repa iring deteriorated joints and panels in the concrete pavement with bituminous material. The work will be performed at locations shown in the contract or designated by the Engineer. This work shall include removing and disposi ng of deteriorated pavement and/or existing bituminous patching material , preparation of the repair areas, and furnishing, placing, and compacting the bituminous patch material in the repair area.
520.02 Material Requirements
1.The patching material shall be co mposed of a suitable aggregate, plant-mixed with a liquid asphalt blend. The bituminous material shall be capable of coating aggregates without stripping. The patching material shall be capable of maintaining adhesive qualities in patched areas which are damp or wet at time of application.
2.Bituminous Material - The bituminous material shall consist of a liquid asphalt blend with chemical additives capable of coating wet aggregates without stripping. The bind er shall be homogeneous, free from water, and shall not foam when heat ed to mixing temperature. The bituminous material shall meet the following requirements: Requirement Criteria ASTM D-1310 Flash Point (TOC): 200°F (94 C) AASHTO T201 or ASTM D-2170 Kinematic Viscosity at 140°F (60C): 300-4000 AASHTO T55 or ASTM D-95 Water: 0.2% Maximum AASHTO T78 or ASTM D-402 Distillate Test (Volume of original sample): To 437°F (225 C): None To 260 C (500° F): 0-5% To 315 C (600° F): 0-25% Residue from Distillate at 360 C (680° F): 72-95% Residue Tests: AASHTO T202 or ASTM D-2171 Abs. Viscosity at 140°F (60 C): 125-425 Poise AASHTO T49 or ASTM D-5 Penetration: 200 Minimum AASHTO T51 or ASTM D- 113 Ductility at 39°F (4 C) 1 cm/min: 100 Minimum AASHTO T44 or ASTM D-2042 Solubility in Trichloroethylene: 99% Minimum
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 413–420 of 1,048.