904.01 930 SECTION 904 – BITUMINOUS MATERIALS
904.01 Asphalt Cements ................................ ................................ .......... 930
904.02 Reserved ................................ ................................ ....................... 931
904.03 Emulsifi ed Asphalts ................................ ................................ ..... 931
904.01 Asphalt Cements
Only obtain a sphalt cement for use on Department projects from Certified Asphalt Suppliers that are on the Department’s Producer List . Asphalt cement shall conform to AASHTO M 320 and Department procedures . Direct Tension testing is not required. Instead of PG 64 -22, the Contractor may use asphalt cement graded to PG 67-22. PG 67 -22 shall conform to the requirements of AASHTO M 320 when the applicable tests are conducted at 67 °C and -12 °C, and the dynamic shear of the rolling thin film, pressure aged vessel sample is tested at 26.5 °C. To modify the asphalt , properly b lend one or more modifier(s) consisting styrene butadiene (SB), styrene butadiene styrene (SBS), styrene butadiene rubber (SBR), or Ground Tire Rubber (GTR) to a PG 64 -22 or PG 67 -22 base asphalt. The use of Re -refined Engine Oil Bottoms (REOB) or Vacuum Tower Asphalt Extender (VTAE) is prohibited. GTR used to modify asphalt shall meet the requirements of 921.17. Blending of GTR into asphalt cement shall occur only at the asphalt terminal. Polyphosphoric acid may be used as a modifier but shall not exceed 0.5% by weight of asphalt binder and may only be used when the primary modifier is one of the styrene -based products listed above. In addition to the above, asphalt cement modified with GTR shall meet the following requirement. The temperature difference determined by the Separation Test shall not exceed 15 °F. The separation test shall consist of taking the difference in softening point, as determined by the Ring and Ball Test (AASHTO T 53), between the top and bottom thirds of a specimen prepared per A STM D7173. 904.02 931 In addition to the above requirements, the asphalt cements shall meet the requirements specified in Table 904.01 -1. Table 904.01 -1: Requirements for Asphalt Cement Property* PG 64-22, PG 67-22 PG 70-22 PG 76-22 PG 82-22 Non-recoverable creep compliance at 3.2 kPa, Jnr(3.2), kPa-1 at 64°C, Max 4.5 1.0 0.5 0.5 % Difference in non - recoverable creep compliance, Jnr(diff) at 64°C, %, Max 75 75** N/A N/A * Tested in accordance with AASHTO T 350. ** Shall be waived if Jnr(3.2) is equal to or less than 0.5 PG 76-22 and PG 82 -22 grade asphalts shall meet the requirements for Indication of Elastic response as defined in AASHTO R 92. PG 70 -22 grade asphalts shall have a minimum percent recovery at 3.2 kPa of 29%. Furnish certifications to the Engineer for all shipments utilized in the work, stating that the asphalt cement provided meets the Department’s specification. Ensure that quality control and compliance testing are completed in accordance with the asphalt supplier’ s approved quality control plan and Department procedures. Identify on the certification, the type(s) of modifier used. In addition, the asphalt cement supplier shall provide a temperature -viscosity curve for PG 64 -22 and PG 67 -22 asphalt cements with a recommended mixing temperature range. In order to develop a temperature -viscosity curve, it may be necessary to run the viscosity test at a higher temperature, based on the softening point of the modified asphalt cement.
904.02 Reserved
904.03 Emulsifie d Asphalts
Provide e mulsified asphalts meet ing the test requirements specified in Table
904.03 1.
904.03 932 Table 904.03-1(a): Test Requirements for Emulsified Asphalt Practices AASHTO Test Method CAE-P CSS-1 CSS-1H SS-1H CQS-1H Saybolt-Furol Viscosity @ 77 F, seconds T59 10-50 20-100 20-100 20-100 20-100 Saybolt-Furol Viscosity @ 122 F, seconds T59 n/a n/a n/a n/a n/a Storage Stability Test, 24 - h, % T59 1 Max 1 Max 1 Max 1 Max n/a 5-day Settlement, % T59 n/a n/a n/a n/a n/a Particle Charge T59 Positive Positive Positive n/a Positive Sieve Test, % T59 0.1 Max 0.1 Max 0.1 Max 0.1 Max 0.1 Max Residue by T59 Distillation Distillation Distillation Distillation Distillation Residue, % T59 n/a 57 Min 57 Min 57 Min 62 Min Demulsibility, % T59 n/a n/a n/a n/a n/a Distillate, % T59 55 Max n/a n/a n/a n/a Oil Test, % T59 12 Max n/a n/a n/a n/a Stone Coating T59 n/a n/a n/a n/a n/a Float Test, seconds T50 n/a n/a n/a n/a n/a Penetration T49 300 Min 100-250 40-90 40-90 40-90 Elastic Recovery, % (1) T301 n/a n/a n/a n/a n/a Ductility @ 77 F, cm T51 40 Min 40 Min 40 Min 40 Min 40 Min Ductility @ 40 F, cm T51 n/a n/a n/a n/a n/a R&B Softening Point, F T53 n/a n/a n/a n/a n/a Original G*/sind @ 82 C T315 n/a n/a n/a n/a n/a
1.Straight-sided mold, 20 -cm elongation, 5 min hold, 25 C 904.03 933 Table 904.03 -1(b): Test Requirements for Emulsified Asphalt Practices AASHTO Test Method CQS-1HP SS-1 AEP CRS-2 AE3 Saybolt-Furol Viscosity @ 77 F, seconds T59 20-100 20-100 10-50 n/a n/a Saybolt-Furol Viscosity @ 122 F, seconds T59 n/a n/a n/a 100-400 50 Min Storage Stability Test, 24 - h, % T59 n/a 1 Max n/a 1 Max n/a 5-day Settlement, % T59 n/a n/a 5 Max n/a 5 Max Particle Charge T59 Positive n/a n/a Positive n/a Sieve Test, % T59 0.1 Max 0.1 Max 0.1 Max 0.1 Max n/a Residue by T59 Distillation(1) Distillation Distillation Distillation Distillation Residue, % T59 62 Min 57 Min n/a 65 Min n/a Demulsibility, % T59 n/a n/a n/a 40 Min n/a Distillate, % T59 n/a n/a 55 Max n/a 30 Max Oil Test, % T59 n/a n/a 12.0 Max 3.0 Max 6.0 Max Stone Coating T59 n/a n/a n/a n/a 90 Min Float Test, seconds T50 n/a n/a 20 Min n/a 200 Min Penetration T49 40-90 100-200 n/a 100-250 n/a Elastic Recovery, % (2) T301 n/a n/a n/a n/a n/a Ductility @ 77 F, cm T51 70 Min 40 Min n/a 40 Min n/a Ductility @ 40 F, cm T51 n/a n/a n/a n/a n/a R&B Softening Point, F T53 135 Min n/a n/a n/a n/a Original G*/sind @ 82 C T315 n/a n/a n/a n/a n/a
1.Distill at 350 F
2.Straight-sided mold, 20 -cm elongation, 5 min hold, 25 C 904.03 934 Table 904.03 -1(c): Test Requirements for Emulsified Asphalt Practices AASHTO Test Method CRS-2P RS-2 RS-1 Saybolt-Furol Viscosity @ 77 F, seconds T59 n/a n/a 20-100 Saybolt-Furol Viscosity @ 122 F, seconds T59 100-400 75-400 n/a Storage Stability Test, 24 - h, % T59 1 Max 1 Max 1 Max 5-day Settlement, % T59 n/a n/a n/a Particle Charge T59 Positive n/a n/a Sieve Test, % T59 0.1 Max 0.1 Max 0.1 Max Residue by T59 Evaporation Distillation Distillation Residue, % T59 65 Min 63 Min 55 Min Demulsibility, % T59 40 Min 60 Min 60 Min Distillate, % T59 n/a n/a n/a Oil Test, % T59 n/a n/a n/a Stone Coating T59 n/a n/a n/a Float Test, seconds T50 n/a n/a n/a Penetration T49 75-175 100-200 100-200 Elastic Recovery, % (1) T301 50 Min n/a n/a Ductility @ 77 F, cm T51 40 Min 40 Min 40 Min Ductility @ 40 F, cm T51 n/a n/a n/a R&B Softening Point, F T53 125 Min n/a n/a Original G*/sind @ 82 C T315 n/a n/a n/a
1.Straight-sided mold, 20 -cm elongation, 5min hold, 25 C 904.03 935 The producer may conduct a 24 -hour (1% Max) storage stability test instead of the 5-day settlement test if the emulsions are to be used within 5 days. Obtain emulsified asphalts for use on Department projects from Certified Emulsified Asphalt Suppliers that are on the Department’s Producer List . All emulsified asphalts shall be homogeneous an d shall adhere firmly to the surface of the mineral aggregate. Failure of the emulsified asphalt to perform satisfactorily on the job is cause for rejection, regardless of its ability to pass laboratory tests. Use the AE-3 of such stability that it will remain constant and uniform while being mixed with dry or approximately dry aggregate, and that will thoroughly and uniformly coat the entire surface of each fragment while being manipulated and incorporated into the Work. The emulsified asphalt after being incorporated into the Work shall show no signs of re -emulsifying. Use latex, polymer, and other emulsifiers of styrene butadiene rubber (SBR) or natural latex when manufacturing CQS -1hp. Mill such emulsifiers into the asphalt cement to show no separation after mixing. When using modified emulsions in micro -surface mixtures, the blended mixture when combined with aggregate and mineral filler shall be:
1.Capable of filling up to 1/2 inch wheel ruts in one pass ;
2.Capable of field regulation of the setting time ; and
3.Suitable for nighttime placement. Combine t he latex with the asphalt emulsion at the emulsion mill to produce a homogeneous mixture. Latex modified emulsions , upon standing undisturbed for a period of 24 hours, shall have a uniform color throughout , showing no color striations. 905.01 936 SECTION 905 – JOINT MATERIALS
905.01 Preformed Joint Fillers (Non -Extruding and Resilient Types) ..... 936
905.02 Joint Mortar ................................ ................................ .................. 936
905.03 Rubber Gaskets ................................ ................................ ............ 937
905.04 He mp or Oakum Gaskets ................................ ............................. 937
905.05 Joint Sealants ................................ ................................ ................ 937
905.01 Preformed Joint Fillers (Non-Extruding and Resilient Types)
Provide preformed joint fillers as shown on the Plans. When designated, punch holes in preformed joint filler to admit the dowels. Furnish the filler for each joint in a single piece for the full depth and width required for the joint unless otherwise directed by the Engineer. If the Engineer approves the use of more than one piece for a joint, fasten the abutting ends securely, and hold to shape by stapling or using other positive means of fastening satisfactory to the Engineer.
A.Bituminous Type Provide bituminous type preformed joint fillers conforming to AASHTO M 213.
B.Non-Bituminous Type s Provide non -bituminous types of preformed joint filler conforming to AASHTO M 153, Type I, II, or III, as specified.
C.Polypropylene Foam Type Provide semi -rigid, closed -cell, polypropylene foam, preformed expansion joint filler conforming to ASTM D8139.
905.02 Joint Mortar
Provide pipe joint mortar consisting of one part Portland cement and two parts sand, adding water as necessary to obtain the required consistency. Use Portland cement conforming to the requirements of 901.01, Type I, and sand
Source: Tennessee Standard Specifications for Road and Bridge Construction, 2021 Edition. Pages 939–944 of 1,072.