Part 1 — General
1.1 Section Includes
A.Procedure for sealing cracks in pavement using hot -pour crack sealant or flexible repair mastic material.
1.2 RELATED SECTIONS Not Used
1.3 References
A.AASHTO T 51: Ductility of Bituminous Materials
B.AASHTO T 228: Specific Gravity of Semi -Solid Asphalt Materials
C.AASHTO T 300: Force Ductility of Asphalt Materials
D.ASTM D 36: Softening Point of Bitumen (Ring- and-Ball Apparatus)
E.ASTM D 3111: Flexibility Determination of Hot -Melt Adhesives by Mandrel Bend Test
F.ASTM D 4402: Viscosity Determination of Asphalt at Elevated Temperatures Using a Rotational Viscometer
G.ASTM D 5329: Sealants and Fillers, Hot -Applied, For Joints and Cracks in Asphaltic and Portland Cement Concrete Pavements
H.ASTM D 6690: Joint and Crack Sealants, Hot Applied, for Concrete and Asphalt Pavement
I.ASTM D 8260: Hot -Applied Asphalt Aggregate- Filled Mas tic
1.4 Definitions
A.Flush fill – Filling the crack so that the material is level with the pavement surface.
B.Overband – Extending the sealant or mastic slightly beyond the crack edges to seal both sides and protect against moisture intrusion.
1.5 Submittals
A.Provide the following for hot -pour crack sealants and flexible repair mastic materials.
1.Test results demonstrating compliance with the AASHTO and ASTM properties listed in this specification for review .
a.Use an AASHTO -accredited independent laboratory or the Product Evaluation and Audit Solutions (PEAS) program.
b.Provide test results for the current product formulation performed within the past five years, or from a current PEAS evaluation report.
2.Manufacturer Installation Instructions for information Material Safety Data Sheets (MSDS) for information
1.6 Delivery, Storage, and Handling
A.Supply material pre- proportioned, pre- blended, pre- reacted and pre- packaged in lined boxes weighing no more than 30lb.
1.Use a dissolvable lining that will completely melt and become part of the mastic upon subsequent re- melting.
2.Deliver in the manufacturer’s original sealed container.
a.Clearly mark each container with the manufacturer’s name, trade name of mastic, batch or lot number, and recommended safe heating and application temperatures.
Part 2 — Products
2.1 Hot -Pour Asphalt Pavement Crack Sealant – Udot Type 1
A.Meet the requirements of ASTM D 6690 Type 1.
1.Use material that does not track in normal traffic after 45 minutes from application.
2.Use material that pours readily and penetrates 1/4 inch and wider cracks for the entire application temperature range recommended by the manufacturer.
2.2 Hot -Pour Asphalt Pavement Crack Sealant – Udot Type 2
A.Meet the requirements of Table 1.
1.Use material that does not track in normal traffic after 45 minutes from application.
2.Use material th at pours readily and penetrates 1/4 inch and wider cracks for the entire application temperature range recommended by the manufacturer Table 1 Hot-Pour Asphalt Pavement Crack Sealant – UDOT Type 2 Application Properties Test Method Property Minimum Maximum ASTM D 36 Softening Point (ºF) 200 AASHTO T 51 Ductility, modified, 1cm/min, 39.2º F (4º C), cm 30 AASHTO T 228 Specific Gravity, 60º F (15.6º C) 1.140 AASHTO T 300 (a) Force -Ductility, lb force 4 ASTM D 4402 Viscosity, 380ºF (193.3ºC), SC4 -27 spindle, 20 rpm, Cp 2,500 ASTM D 5329 Cone Penetration, 77º F (25º C), 150 g, 5 sec., dmm 75 ASTM D 5329 Flow 140ºF (60º C), 5 hrs 75º angle, mm 1 ASTM D 5329 Resilience, 77º F (25º C), 20 sec., percent 40 ASTM D 5329 (b) (c) Bond , Non-Immersed Pass ASTM D 5329 Asphalt Compatibility Pass (a) Maximum of 4 lb force during the specified elongation of 30 cm @ 1 cm/min, 39.2º F (4º C). (b) Three 12.7mm Specimens pass 3 cycles at 50% ext. at 0 ºF. (c) The development at any time during the test procedure of a crack, separation, or other opening that at any point is over 6 mm deep, in the sealant or between the sealant and concrete block shall constitute failure of the test specimen. Measure the depth of the crack, separation or other opening perpendicular to the side of the sealant showing the defect.
2.3 Hot -Pour Asphalt Pavement Crack Sealant – Udot Type 3
A.Meet the requirements of Table 2.
1.Use material that does not track in normal traffic after 45 minutes from application.
2.Use material th at pours readily and penetrates 1/4 inch and wider cracks for the entire application temperature range recommended by the manufacturer Table 2 Hot-Pour Asphalt Pavement Crack Sealant – UDOT Type 3 Application Properties Test Method Property Minimum Maximum ASTM D 36 Softening Point ( ºF) 205 ASTM D 113 Ductility, 77º F (25º C), cm 40 ASTM D 3111 Flexibility, 1" (25 mm) mandrel, 90º bend, 2 sec., 0ºF ( -18ºC) no cracks ASTM D 5329 Cone Penetration, 77º F (25º C), 150 g, 5 sec., dmm 60 ASTM D 5329 (a)(b) Bond , Non -Immersed Pass ASTM D 5329 Resilience, 77º F (25º C), 20 sec., percent 40 ASTM D 5329 Asphalt Compatibility Pass (a) Two out of three 25.4mm specimens pass 5 cycles at 50% ext. at 20 ºF (b) The development at any time during the test procedure of a crack, separation, or other opening that at any point is over 6 mm deep, in the sealant or between the sealant and concrete block shall constitute failure of the test specimen. Measure the depth of the crack, separation or other opening perpendicular to the side of the sealant showing the defect.
2.4 Flexible Repair Mastic Material
A.Meet the requirements of ASTM D 8260, Type I or Type II
2.5 Hot -Pour Crack Sealant for Concrete Pavements
A.Meet the requirements of ASTM D 6690, Type II
2.6 Equipment
A.Sealant Heating Equipment
1.Use a double boiler or circulating hot oil heat transfer unit for indirectly heating product.
a.Use a unit capable of constant agitation.
b.Do not use direct heat transfer units (tar pots) .
B.Pavement Crack Router
1.Use equipment sufficiently maneuverable to follow meandering cracks and provide a uniform and controlled routing depth.
a.Use bits sharp enough to create a clean cut.
C.Compressed Air Lance or Hot Air Lance
1.Use a lance capable of providing clean, oil -free compressed air at a minimum volume of 90 cubic feet per minute at a pressure of 120 lbs per square inch.
Part 3 — Execution
3.1 Prepa Ration
A.Use a pavement crack router to open transver se cracks between 1/8 inch and 1/2 inch wide.
1.The Engineer may require routing longitudinal cracking if additional bonding and flexibility is desired.
2.Route j oints and to a 1/2 inch wide x 1/2 inch deep or 3/4 inch wide x 3/4 inch deep configuration.
3.Remove material from each side of the crack to produce a vertical, intact surface with no loosely bonded aggregates.
B.Use compressed air to clean crack walls and the surface around the crack.
1.Use a hot air lance when surfaces are wet or when air temperature is less th an 40 degrees F .
a.Do not use on saturated pavements.
b.Do not burn the surrounding pavement.
c.Seal cracks before pavement cools down .
3.2 Asphalt Pavement Sealant Application
A.Fill cracks less than or equal to 1 1/2 inch wide with hot -pour crack sealant .
1.Follow manufacturer safe heating and application temperatures.
2.Flush fill in applications prior to placement of a surface treatment or overlay.
a.Remove crack overfill by squeegee.
3.Overband, using a sealing disc, when a surface treatment or overlay is not scheduled within one year.
B.Fill cracks greater than 1 1/2 inch wide with flexible repair mastic material.
1.Verify the mastic fills the crack and extends slightly beyond the edges to create a controlled overband, sealing both sides of the crack.
C.Install material in a manner that produces an acceptably smooth riding surface.
D.Reapply material to any crack segment where material shrinkage or insufficient material was applied in a previous pass or application.
3.3 Limitation S
A.Do not place during rain or other adverse weather conditions.
B.Do not place if surface moisture is present.
C.Do not place on concrete bridge decks.
Source: Utah Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 433–438 of 1,331.