3−4 in accordance with the requirement of Subsection 301.03.2; Shaping and Compaction , of these Specifications. 303.04 METHOD OF MEASUREMENT. "Special Graded Aggregate" will be measured by the number of cubic yards or the number of tons, as the case may be, actually placed in accordance with the Plans and/or as directed by the Engineer.
303.05 BASIS OF PAYMENT. The accepted quantity of "Special Graded Aggregate" will be paid
for at the contract unit price per ton or per cubic yard, as the case may be, as listed in the Proposal. The price so-stated shall constitute full and complete compensation for all labor, materials, and equipment, including trimming and fine grading, and all incidentals required to finish the work, complete and accepted by the Engineer.
304.01 DESCRIPTION. This work consists of providing select leveling and filler aggregate to
adjust subbase or subgrade surfaces to close conf ormance with the lines, grades, and typical cross sections indicated on the Plans, all in accordance with these Specifications. 304.02 MATERIALS. Select leveling and filler aggregate shall be a composite of crushed or uncrushed coarse aggregate and natural or crushed fine aggregate, all provided from approved sources. The composite aggregate shall be free of compressible or organic soils, soft or elongated rock fragments or gravel, and vegetative matter. Coarse aggregate (plus No. 4) may consist of crushed rock fragments, crushed or uncrushed gravel, or a blend of crushed and uncrushed rock and gravel. Each coarse aggregate component source material shall have been shown i ndividually to have a percentage of wear by Los Angeles Abrasion Test (AASHTO T96) of not more than 50 percent, and a Sodium Sulfate Soundness (AASHTO T104) of not more than 12 percent. Fine aggregate may consist of natural sand or particles produced by crushing rock or gravel, and shall be free of organic soils or other deleterious matter. The composite coarse and fine aggregate mix shall conform to the following gradation requirements, as well as all other applicable specifications prior to its final placement on the Project: 3−5 Square Mesh Percentage by Weight Passing Sieve Size: Indicated Sieve Size: 1½" 100 1" 70 - 100 3/4" 50 - 85 3/8" 40 - 75 No. 4 30 - 55 No. 40 0 - 25 No. 200 0 - 8
304.03 Construction Methods.
304.03.1 Surface Preparation. The existing subbase or subgrade surface shall be scarified to a
depth of 3 inches prior to placement of the select aggregate as a filler for local depressions or washouts, or as a leveling course. 304.03.2 Placement. Select leveling and filler aggregate shall be placed in layers such that the maximum compacted thickness of any one layer shall not exceed 6 inches. 304.04 METHOD OF MEASUREMENT. "Select Leveling and Filler Aggregate" will be measured by the number of cubic yards actually placed in accordance with the Plans and/or as directed by the Engineer. 304.05 BASIS OF PAYMENT. The accepted quantity of "Select Leveling and Filler Aggregate" will be paid for at the contract unit price per cubic yard as listed in the Proposal. The price so-stated constitutes full and complete compensation for all labor, materials and equipment, including trimming and fine grading and all incidentals required to finish the work, complete and accepted by the Engineer. 4−1PART 400 BITUMINOUS PAVEMENTS SECTION 401 DENSE GRADED HOT MIX ASPHALT (HMA) PAVEMENTS
401.01 DESCRIPTION . This work consists of constructing HMA pavements on prepared
foundations in conformity with the dimensions and details indicated on t he Plans, and in accordance with these Specifications. These Specifications are applicable to all types of Dense Graded HMA pavements irrespective of aggregate gradation, grade of performance graded asphalt binder (PGAB), or pavement use. The HMA shall be composed of a mixture of aggregate, PGAB, and filler if required. The aggregate shall be sized, graded and combined in such proportions that the resulting mixture meets the gradation requirements of the job mix formula (JMF). 401.02 MATERIALS .
401.02.1 Aggregates. Aggregates shall meet the applicable requirements of Subsection
M.03.02.2 of these Specifications and AASHTO M 323.
401.02.2 Performance Graded Asphalt Binder (PGAB). All grades shall conform to AASHTO M
320 and R 29. The PGAB shall meet the requirements of PG 64S-28 with the exception of both Class 19.0 and mixes designated as “Base Course” which shall incorporate PG 64S-22 for mixes with less than 15% RAP. Both Class 19.0 and “Base Course” mixes with 15 to 25 percent RAP shall incorporate PG 58S-28. Should a class of HMA be designated as “Modifi ed”, the binder shall meet the requirements of PG 64E-28 and shall incorporate at least 2.0% SBS polymer. The nonrecoverable creep compliance versus percent recovery of the binder shall be plotted and must fall above the curve in Figure X1.1 in Appendix X1 of AASHTO M 332. Should a class of HMA be designated as “with WMA” the Contractor shall use a WMA (Warm Mix Additive). WMA shall conform to Section 414 of these specifications. Re-refined engine oil bottoms (REOB) shall not be used in any PGAB.
401.02.3 Mix Design. HMA mixes shall conform to AASHTO M 323, "Standard Specification for
Superpave Volumetric Mix Design". The design procedure shall follow AASHTO R 35 "Standard Practice for Superpave Volumetric Design for Ho t-Mix Asphalt (HMA)". The optimum binder content (OBC) shall be determined as follows:
a.The OBC for Class 4.75, Class 9.5, and Class 12.5 when not designated as “Base Course” shall be determined using PG 64S-28.
b.The OBC for Class 4.75, Class 9.5, and Class 12.5 when designated as “Base Course”
Source: Rhode Island Standard Specifications (Bluebook), 2024 Edition. Pages 176–179 of 826.