285-1 Description.
Construct a base course composed of one of the optional materials shown on the typical sections.
285-2 Materials.
Meet the material requirements as specified in the Section covering the particular type of base to be constructed. Graded Aggregate ................................ ............... Section 204 Asphalt ................................ ................................ Section 234 Reclaimed Asphalt Pavement (RAP)* ................ Section 283 Limerock ................................ ............................. Section 911 Shell Base ................................ ............................ Section 911 Shell-Rock................................ ........................... Section 911 Cemented Coquina ................................ ..............Section 911 Recycled Concrete Aggregate (RCA)* * .............Section 911 *Only for use on non -limited access paved shoulders, shared use paths, or other non-traffic bearing applications. **Do not use on interstate roadways .
285-3 Selection of Base Option.
The Plans will include typical sections indicating the various types of base construction (material and thickness) allowable. When base options are specified in the Plans, use only those options. When base option s are not specified, select one base option as allowed for each typical section shown in the Plans. Only one base option is permitted for each typical section. See Tables 285 -1 and 285 -2 for optional base materials, thickness and additional restrictions. Notify the Engineer in writing of the base option selected for each typical section at least 45 calendar days prior to beginning placement of base material. FY 2023-24 Return to Table of Contents Table 285-1 Optional Base Groups 1 through 7 Base Materials Base Group (Base Group Pay Item) (701) 2 (702) 3 (703) 4 (704) 5 (705) 6 (706) 7 (707) Limerock, LBR 100 4” 5” 5-1/2” 6” 7” 8” 8-1/2” Cemented Coquina, LBR 100 4” 5” 5-1/2” 6” 7” 8” 8-1/2” Shell Rock, LBR 100 4” 5” 5-1/2” 6” 7” 8” 8-1/2” Bank Run Shell, LBR 100 4” 5” 5-1/2” 6” 7” 8” 8-1/2” Recycled Concrete Aggregate, LBR 150(1) 4” 5” 5-1/2” 6” 7” 8” 8-1/2” Graded Aggregate Base, LBR 100 4-1/2” 5-1/2” 6-1/2” 7-1/2” 8-1/2” 9” 10” Type B-12.5 4” (3) 4” (3) 4” (3) 4” (3) 4-1/2” 5” 5-1/2” B-12.5 and 4” Granular Subbase, LBR 100 (2) - - - - - - - RAP Base (4) 5” (4) - - - - - -
1.Do not use on interstate roadways.
2.The construction of both the subbase and Type B-12.5 will be bid and used as Optional Base. Granular subbases include limerock, cemented coquina, shell rock, bank run shell, recycled concrete aggregate and graded aggregate base. All subbase thicknesses are 4” minimum prior to adding the required prime coat.
3.Based on minimum practical thickness.
4.Only for us e on non-limited access paved shoulders, shared use paths, or other non -traffic bearing applications.
5.To be used for widening, three feet or less. Table 285-1(continued) Optional Base Groups 8 through 15 Base Materials Base Group (Base Group Pay Item) (708) 9 (709) 10 (710) 11 (711) 12 (712) 13 (713) 14 (714) 15 (715) Limerock, LBR 100 9-1/2” 10” 11” 12” 12-1/2” 13-1/2” (5) 14” (5) - Cemented Coquina, LBR 100 9-1/2” 10” 11” 12” 12-1/2” 13-1/2” (5) 14” (5) - Shell Rock, LBR 100 9-1/2” 10” 11” 12” 12-1/2” 13-1/2” (5) 14” (5) - Bank Run Shell, LBR 100 9-1/2” 10” 11” 12” 12-1/2” 13-1/2” (5) 14 (5) - Recycled Concrete Aggregate, LBR 150 (1) 9-1/2” 10” 11” 12” 12-1/2” 13-1/2” (5) 14” (5) - Graded Aggregate Base, LBR 100 11” 12” 13” 14” - - - - Type B-12.5 5-1/2” 6” 6-1/2” 7” 7-1/2” 8” 8-1/2” 9” B-12.5 and 4” Granular Subbase, LBR 100 (2) - 4” 4-1/2” 5” 5-1/2” 6” 6-1/2” 7” FY 2023-24 Return to Table of Contents Table 285-1(continued) Optional Base Groups 8 through 15 Base Materials Base Group (Base Group Pay Item) (708) 9 (709) 10 (710) 11 (711) 12 (712) 13 (713) 14 (714) 15 (715) RAP Base (4) - - - - - - - -
1.Do not use on interstate roadways.
2.The construction of both the subbase and Type B-12.5 will be bid and used as Optional Base. Granular subbases include limerock, cemented coquina, shell rock, bank run shell, recycled concrete aggregate and graded aggregate base. All subbase thicknesses are 4” minimum prior to adding the required prime coat .
3.Based on minimum practical thickness.
4.Only for use on non -limited access paved shoulders, shared use paths, or other non -traffic bearing applications.
5.To be used for widening, three feet or less. Table 285-2: Limited Use Optional Base Groups(1) Base Materials Base Group (Base Group Pay Item) (701) 102 (702) 103 (703) 104 (704) 105 (705) 106 (706) 107 (707) 108 (708) Limerock Stabilized, LBR 70 5” 6-1/2” 8” 9” 10” 11” 12-1/2” - Shell, LBR 70 5” 6-1/2” 8” 9” 10” 11” 12-1/2” - Shell Stabilized, LBR 70 7” 8-1/2” 9-1/2” 10-1/2” 12” - - - Sand-Clay, LBR 75 5” 6-1/2” 8” 9” 10” 11” 12-1/2” - Soil Cement (300 psi) (Plant Mixed) 5” 5-1/2” 6-1/2” 7-1/2” 8-1/2” 9” 10” 11” Soil Cement (300 psi) (Road Mixed) 5” 5-1/2” 6-1/2” 7-1/2” 8-1/2” - - - Soil Cement (500 psi) (Plant Mixed) 4” (2) 4” 5” 5-1/2” 6” 7” 7-1/2” 8-1/2”
1.Use only when specified in the Plans.
2.Based on minimum practical thicknesses.
285-4 Construction Requirements.
Construct the base in accordance with the Section covering the particular type of base to be constructed. Graded Aggregate ................................ ............... Section 204 Asphalt ................................ ................................ Section 234 Reclaimed Asphalt Pavement (RAP)* ................ Section 283 Limerock ................................ ............................. Section 200 Shell Base ................................ ............................ Section 200 Shell Rock ................................ ........................... Section 200 Cemented Coquina ................................ ..............Section 200 Recycled Concrete Aggregate (RCA)* * .............Section 200 FY 2023-24 Return to Table of Contents *Only for use on non -limited access paved shoulders, shared use paths, or other non-traffic **Do not use on interstate roadways.
285-5 Variation in Earthwork Quantities.
The Plans will identify the optional materials used by the Department for determining the earthwork quantities (Roadway Excavation, Borrow Excavation, Subsoil Excavation, Subsoil Earthwork, or Embankment). The Department wil l not revise the quantities, for those items having final pay based on plan quantity, to reflect any volumetric change caused by the Contractor’s selection of a different optional material.
285-6 Thickness Requirements.
285-6.1 Measurements: For non-asphalt bases, meet the requirements of 200 -7.3.1.2.
For subbases, meet the thickness requirements of 290 -4. The Engineer will determine the thickness of asphalt base courses in accordance with 234-8.1.
285-6.2 Correction of Deficient Areas: For non-asphalt bases, correct all areas of the
completed base having a deficiency in thickness in excess of 1/2 inch by scarifying and adding additional base material. As an exception, if authorized by the Engineer, such areas may be left in place without correction and with no payment. For asphalt bases, correct all areas of deficient thickness in accordance with 234-8.
285-7 Calculation of Average Thickness of Base.
For bases that are not mixed in place, the Engineer will determine the average thickne ss from the measurements specified in 285 -6.1, calculated as follows:
1.When the measured thickness is more than 1/2 inch greater than the design thickness shown on the typical section in the Plans, it will be considered as the design thickness plus 1/2 inch.
2.Average thickness will be calculated per typical section for the entire job as a unit.
3.Any areas of base left in place with no payment will not be included in the calculations.
4.Where it is not possible through borings to distinguish t he base materials from the underlying materials, the thickness of the base used in the measurement will be the design thickness.
5.For Superpave asphalt base course, the average spread rate of each course shall be constructed in compliance with 234 -8.
285-8 Method of Measurement.
The quantity to be paid for will be the plan quantity area in square yards, omitting any areas where under -thickness is in excess of the allowable tolerance as specified in 285 -6. The pay area will be the surface area, determin ed as provided above, adjusted in accordance with the following formula: )Thickness Plan7 -285 per Thickness Average Calculated( Area Surface = Area Pay FY 2023-24 Return to Table of Contents The pay area shall not exceed 105% of the surface area. There will be no adjustment of the pay area on the basis of thickness for base courses constructed ut ilizing mixed -in-place operations. For Superpave asphalt base course, the quantity to be paid for will be the plan quantity area in square yards. The pay area will be adjusted in accordance with 234 -9.
285-9 Basis of Payment.
Price and payment will be fu ll compensation for all work specified in this Section, including tack coat between base layers, prime coat, cover material for prime coat, bituminous material used in bituminous plant mix, and cement used in soil -cement. For superpave asphalt base course , a pay adjustment based upon the quality of the material will be applied in accordance with 334-8. Where the Plans include a typical section which requires the construction of an asphalt base only, price adjustments for bituminous material provided for in 9 -2.1.2 will apply to that typical section. For typical sections which permit the use of asphalt or other materials for construction of an optional base, price adjustments for bituminous material provided for in 9 - 2.1.2 will not apply. Payment will be made under: Item No. 285 - 7- Optional Base - per square yard. FY 2023-24 Return to Table of Contents SECTION 286 DRIVEWAY BASE
286-1 Description.
Construct a base course for paved or graded driveways in accordance with the Plans and Standard Plans, Index 330-001. The Department does not include placing of pavement over driveway base in this Section. The requirements for concrete driveways are included in Section 522.
286-2 Materials.
For driveway base material, use any material meeting the minimum requirements provided in Standard Plans, Index 330-001 and currently specified by the Departmen t for base or surface construction, except do not use hot bituminous mixtures intended for use as open -graded friction course. Proportion bituminous mixtures in accordance with a job -mix formula approved by the Department. In general, the Engineer will ac cept the material bas ed on visual inspection, with no testing required.
286-3 Excavation.
Excavate the area over which driveway construction is to be accomplished to the dimensions shown in the Plans. If the surface of the underlying soil is disturbed dur ing the excavation operation, compact it to the approximate density of the surrounding undisturbed soil. If an existing paved driveway lies within the specified limits for construction, leave the existing base and surface in place, as directed by the Engi neer.
286-4 Spreading, Compacting, and Finishing Base.
Uniformly spread base material over the prepared area to a depth which will, upon completion of compaction and finishing, result in driveway base conforming with the specified lines and elevations. Th en, strike off the base material to a plane paralleling the finished surface, and compact it in a manner similar to that used in the construction of roadway base. The Engineer will not require any specific density. Finish the surface to the specified grad e and cross slope.
286-5 Method of Measurement.
286-5.1 Driveway Base (Optional): The quantity to be paid for will be the plan quantity
area, in square yards .
286-5.2 Driveway Asphalt Base: When specified in the Plans, asphalt base will be paid
for by we ight of mixture, the weight will be measured as specified in 320 -3. Prepare and submit a Certification of Quantities to the Engineer in accordance with 9-2.1.2.
286-6 Basis of Payment.
Price and payment will be full compensation for all work specified i n this Section, including excavating; compacting excavated areas; furnishing material; placing, compacting, and finishing of base; and incidental work. FY 2023-24 Return to Table of Contents
Source: Florida Standard Specifications for Road and Bridge Construction, 2024 Edition. Pages 248–252 of 1,299.