914-1 General.
This Section governs materials to be used in subgrade stabilization. Meet the following requirements: Table 914-1 Plasticity Index (AASHTO T 90) Maximum 10 Liquid Limit (AASHTO T 89) Maximum 40 Passing a 3 -1/2 inch screen (AASHTO T 27) Minimum 97% LBR No Requirement
914-2 Materials for Stabilizing (Limerock Bearing Ratio -LBR).
914-2.1 Commercial Materials : Materials may be either limerock, shell rock, cemented
coquina or shell base sources approved in accordance with 6 -2.3.
914-2.2 Local Materials: Local materials used for stabilizing may be soils or recyclable
materials such as crushed concrete, roof tiles and asphalt coated base, reclaimed asphalt pavement (RAP) or Fossil Fuel Combustion Products (FFCPs) provided the following limits for organic content are met . Table 914-2 Average Organic Content* (FM 1-T267) Maximum 2.5% Individual Organic Content Sample (FM 1-T267) Maximum 4% *Note: A minimu m of three samples per source . FFCPs may be used provided they meet the requirements of 403.7047, F.S., are not used outside the paved area and are not less than 3 feet above the design high groundwater table. All materials for stabilizing must meet all applicable air or water quality standards or criteria in Florida Department of Environmental Protection (FDEP) rules . FY 2023-24 Return to Table of Contents SECTION 916 BITUMINOUS MATERIALS
916-1 General.
All products supplied under this Specification shall be one of the products included on the Approved Product List ( APL). Producers seeking evaluation of a product for inclusion on the APL shall submit an application in accordance with Section 6. Any marked variation from the original test values for a material below the established limits or evidence of inadequate quality control or field performance of a material will be considered sufficient evidence that the properties of the material have changed, and the material will be removed from the APL.
916-2 Superpave PG Asphalt Binder .
916-2.1 Requirements: Superpave Performance Graded (PG) asphalt binders, identified
as PG 52-28, PG 58-22, PG 67-22, polymer modified asphalt (PMA) binders, PG 76-22 (PMA) and High Polymer, and asphalt rubber binders (ARB), PG 76-22 (ARB), shall meet the requirements of 916 -2 and AASHTO 332. When the Contract Documents specify either a PG 76- 22 (PMA), PG 76-22 (ARB), or PG 76-22 binder, either binder can be used interchangeably at no additional cost to the Department. All PG asphalt binders shall meet the following additional requirements:
1.The intermediate test temperature at 10 rad/sec. for the Dynami c Shear Rheometer (DSR) test (AASHTO T 315) shall be 26.5ºC for PG grades PG 67 and higher.
2.An additional high temperature grade of PG 67 is added for which the high test temperature at 10 rad/sec for the DSR test (AASHTO T 315) shall be 67ºC.
3.All PG asphalt binders having a high temperature designation of PG 67 or lower shall be prepared without modification.
4.All PMA binders having a high temperature designation higher than PG 67 shall only be produced with a styrene -butadiene-styrene (SBS) or styrene -butadiene (SB) elastomeric polymer modifier and the resultant binder shall meet all requirements of this S ection.
5.Polyphosphoric acid may be used as a modifier not exceeding 0.75% by weight of asphalt binder for PG 76-22 (PMA) and PG 76-22 (ARB) binders. Polyphosphoric acid may not be used in High Polymer binder.
6.PG 76-22 (ARB) shall meet the additional requirements of 916 -2.1.1.
7.All PG asphalt binders having a high temperature designation of PG 67 or lower shall not have a high temperature true grade more than 5.9°C higher than the specified PG grade, (for example, if a PG 58-22 is specified, do not supply a PG 64-22 or higher).
8.The use of waste oil is prohibited in the modification of any PG binder grade. Waste oil shall be defined as recycled oil products that have not been processed through a vacuum tower and have an initial boiling point of 385°C (725°F) or lower when tested in accordance with ASTM D6352.
9.Re-refined engine oil bottoms (REOB)/vacuum tower asphalt extenders (VTAE) may be used as a modifier not exceeding 8.0% by weight of asphalt binder. REOB/VTAE are materials as defined in Asphalt Institute document IS -235. For all PG binder used in all hot mix asphalt, silicone may be added to the PG binder at the rate of 25 cubic centimeters of silicone mixed to each 5,000 gallons of PG binder. If a disbursing fluid is used in conjunction with the silicone, the resultant mixture containing the full FY 2023-24 Return to Table of Contents
Source: Florida Standard Specifications for Road and Bridge Construction, 2024 Edition. Pages 998–998 of 1,299.