SECTION 403 – ULTRA-THIN FRICTION COURSE
403.01 Description
This Section describes the requirements for constructing an ultra -thin friction course of gap -graded HMA placed on a polymer modified asphalt tack/seal coat.
403.02 Materials
403.02.01 Materials
Provide materials as specified: Polymer Modified Emulsified Asphalt, Grade CRS-1P ................................ ................................ ............. 902.01.03 Ultra-Thin HMA ................................ ................................ ................................ ................................ ........... 902.04
403.02.02 Equipment
Provide equipment as specified: Materials Transfer Vehicle (MTV) ................................ ................................ ................................ .............. 1003.01 Spray Paver................................ ................................ ................................ ................................ ................. 1003.04 HMA Compactor ................................ ................................ ................................ ................................ ........ 1003.05 Vibratory Drum Compactor ................................ ................................ ................................ ......................... 1003.06 HMA Plant ................................ ................................ ................................ ................................ ................. 1009.01 HMA Trucks ................................ ................................ ................................ ................................ ............... 1009.02
403.03 Construction
403.03.01 Ultra-Thin Friction Course
A.Paving Plan. At least 20 days before the start of placing the ultra -thin friction course, submit a detailed plan of operation to the RE for approval as specified in 401.03.07.A.
B.Weather Limitations. Do not place ultra-thin friction course if it is precipitating. Do not allow trucks to leave the plant when precipitation is imminent. The Contractor may resume operations when the precipitation has stopped and the surface is free of water. Do not pave if the base temperature is below 50 °F.
C.Test Strip. Construct a test strip for the first 700 to 1,200 square yards placed of ultra-thin friction course. Operate spray paver without mix to determine tack coat application rate for the project. Ensure that the polymer modified tack coat has been placed as specified in 401.03.05. Transport and deliver, spread and grade, and compact as specified in 403.03.01.D, 403.03.01.E, and 403.03.01.F, respectively, and according to the approved paving plan. While constructing the test strip, record the following information and submit to the RE:
1.Ambient Temperature. Measure ambient temperature at the beginning and end of each day’s paving operation.
2.Base Temperature. Measure the surface temperature of the existing base before paving.
3.Polymer Modified Tack Coat . Measure to verify the proper application of tack coat and the rate for compliance.
4.HMA Temperature. Measure the temperature of the ultra-thin HMA immediately after placement.
5.Roller Pattern. Provide details on the number of rollers, type, and number of passes used on the test strip.
6.Quality Control Cores for Yield and Thickness. Take 3 randomly selected quality control cores to test for compliance to the specified yield in 403.03.01.E. Use drilling equipment with a water -cooled, diamond-tipped masonry drill bit that produces 6 inch nominal diameter cores for the full depth of the pavement. Remove the core from the pavement without damaging it. After removing the core, remove all water from the hole. Fill the hole with HMA or cold patching material, and compact the material so that it is 1/4 inch above the surrounding pavement surface. Submit test strip results to the RE. The RE will analyze the test strip results in conjunction with the ME’s results from the HMA plant to approve the test strip. Do not proceed with production paving until receiving written permission from the RE. If the test strip does not meet requirements, make adjustments and construct a second test strip. If the second test strip does not meet requirements, suspend paving operations until written approval to proceed is received. Before making adjustments to the paving operations, notify the RE in writing.
D.Transportation and Delivery of HMA. Transport and deliver HMA as specified in 401.03.07.D.
E.Spreading and Grading. Use of an MTV is required for the construction of ultra-thin friction course. Ensure that the surface where the ultra-thin friction course is placed is clean of foreign and loose material. Clean the surface of existing pavement using a self-propelled power broom equipped with a vacuum collection system before placing the ultra-thin friction course. Ensure that the surface is dry when the paving operations are about to start. Apply polymer modified tack coat as specified in 401.03.05. Do not allow traffic, equipment, tools, or any other disturbance to the polymer modified tack coat before placing the ultra-thin friction course. Ensure that the temperature of the ultra-thin friction course behind the screed is between 280 °F and 325 °F. Within 3 seconds of applying the polymer modified tack coat, place ultra-thin friction course at a rate of 65 to 95 pounds per square yard. Construct longitudinal joints as specified in 401.03.07.E.1. If constructing a cold longitudinal joint, construct a butt joint and do not use polymerized joint adhesive. Construct transverse joints as specified in 401.03.07.E.2.
Referenced in this section
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Source: Standard Specifications for Road and Bridge Construction, 2019 (rev. 2022-12-21) Edition. Pages 204–205 of 651. View official source ↗