4−45proceed and thereafter maintain the roadway within the project limits in a safe and passable condition. Repair shall consist of placing asphalt patching material by hand in up to 2-inch lifts leaving the repair flush with the existing roadway pavem ent when complete. The pothole shall be free of loose asphalt, debris and excess moisture. The compaction shall be done using a vibratory plate compactor or other appropriate equipment. 410.03.2 Trenches. The Contractor shall repair all trenches within the project limits. Repair shall consist of placing asphalt patching material in a workmanlike manner. The existing pavement shall be neatly cut on both sides. The gravel backfill shall be compacted to the required density and the subgrade left free of loose asphalt, debris and excess moisture. The bituminous patch material shall be placed in a properly compacted 2-inch lift unless otherwise detailed on the Plans. When completed, the patch shall be left flush with the existing roadway pavement. 410.03.3 Damage Claims . Failure to maintain the roadway as required by this Section will result in the Contractor being held liable for any and all damage claims in accordance with Subsection 107.13; Responsibility for Damage Claims.
410.04 METHOD OF MEASUREMENT. Temporary patching of potholes as specified in this
Section will not be measured by a single unit of measurement but instead will be documented on a Force Account basis as set forth below in Subsection 410.05.1 .
410.04.1 Trenches . Temporary patching of trenches will be measured by the number of tons of
such material actually placed in accordance with the Plans and/or as directed by the Engineer 410.05 BASIS OF PAYMENT.
410.05.1 Potholes . Temporary patching of potholes will be paid for on a Force Account basis as
set forth in Para. a.4 of Subsection 109.04; Differing Site C onditions, Changes, Extra Work and Force Account Work , of these Specifications.
410.05.2 Trenches . Temporary patching of trenches will be paid for at the contract unit price per
ton as listed in the Proposal. The price so-stated constitutes full and complete compensation for all labor, materials, and equipment and all incidentals required to finish the work, complete and accepted by the Engineer.
411.01 DESCRIPTION. This work shall consist of providing a paver placed elastomeric surface
treatment (PPEST) at the locations designated on the plans and as directed by the Engineer. All work shall be performed in accordance with the provisions of Part 400 of these Standard 4−46 Specifications for Road and Bridge Construction, with the following additions and amendments.
411.02 Materials.
411.02.1 Modified Asphalt Binder. This shall consist of a blend of neat asphalt cement and
crumb rubber, which are chemically bonded to produce a modified asphalt binder that complies with all the requirements of AASHTO MP1a for PG 76-34, with a separation less than 5% (AASHTO PP 5-93, Section 8.3). The modified asphalt binder shall not contain any particles of rubber or elastomeric material when tested in accordance with AASHTO T 44. It shall incorporate an aromatic VOC inhibitor to mitigate odors at a dosage rate that conforms to the manufacturer’s recommendation. The modified asphalt binder shall contain no polyphosphoric acid. In addition, the dynamic shear of the pressure aging vessel residue shall not exceed 5000 kPa at 7 oC. The elastic recovery at 4oC (AASHTO T301) shall be not less than 70%. The supplier of the modified asphalt binder shall certify the composition and PG grade of the modified asphalt binder. Asphalt Cement. The high temperature grade (AASHTO MP1a) of the neat asphalt cement shall not exceed PG 58-XX. Anti-Stripping Agent. An anti-stripping agent that heat stable and approved by the Engineer may be added to the neat asphalt cement prior to blending with the crumb rubber. The dosage (not exceeding 1.0% by weight of asphalt cement) shall be within the manufacturer’s specified range and shall be determined during the course of the mix design. (Note: Notwithstanding the addition of an anti-stripping agent, the asphalt binder grade shall be PG 76-34.) Crumb Rubber. The asphalt binder shall have a crumb rubber content of not less than 7% by weight of asphalt cement. The maximum size of the crumb rubber shall be 80 mesh. Chemical Bonding Agent. The chemical bonding agent shall be heat stable and compatible with asphalt and rubber.
411.02.2 Aggregate. The coarse aggregate shall be virgin crushed quarry rock from a RIDOT
approved source. Processed gravel shall not be permitted. There shall be no more than 10% flat or elongated particles (ASTM D4791). The aggregate wear, from resistance to abrasion, shall be a maximum of 30% as determined by the Los Angeles Abrasion Test (AASHTO T 96). The fine aggregate shall be crushed stone screenings, natural sand, or a blend thereof. No more than 10 percent of the total aggregate blend may be natural sand.
411.02.3 Mix Design. The mix design shall be in accordance with Subsection 401.02.5 of the RI
Standard Specifications, with the following exceptions:
a.The job-mix formula shall be within the following master range: Sieve Size Percent Passing 1/2" 100 3/8" 91 - 95 #4 40 - 45 #8 22 - 26 #30 9 - 12 #50 6 - 8 #200 4.0
Source: Rhode Island Standard Specifications (Bluebook), 2024 Edition. Pages 223–224 of 826.