SECTION 305 – RUBBLIZING CONCRETE PAVEMENT
305.01 Description
This Section describes the requirements for rubblizing existing concrete pavement and seating before placing a HMA overlay.
305.02 Materials
305.02.01 Materials
Provide materials as specified: Dense-Graded Aggregate................................ ................................ ................................ .............................. 901.10
305.02.02 Equipment
Provide equipment as specified: Resonant Method Breaking Equipment ................................ ................................ ................................ .............................. 1006.01.A Smooth Drum Vibratory Roller................................ ................................ ................................ .............. 1006.02.B Multi-Head Method Breaking Equipment ................................ ................................ ................................ .............................. 1006.01.B Z-Grid Roller ................................ ................................ ................................ ................................ ........ 1006.02.A Smooth Drum Vibratory Roller................................ ................................ ................................ .............. 1006.02.B Provide breaking equipment, as required by the TCP, capable of operating within 1 foot of barrier curbs and structures.
305.03 Construction
305.03.01 Rubblization
A.Existing Subsurface Facility Investigation. Obtain RE approval of the method of inspecting existing subsurface facilities for existing conditions. Inspect the existing subsurface facilities within the limits of rubblization.
B.Installing Drainage System. Ensure that the entire underdrain system is installed at least 15 days before beginning rubblization.
C.Removing Existing HMA Surfaces. Before beginning rubblization, remove existing HMA overlays and HMA surface patches from the concrete pavement surfaces to be rubblized. Remove existing full-depth HMA repairs and fill the void with DGA.
D.Sawcutting Joints. If the limit of the rubblization is not at an existing joint, or if the concrete being rubblized abuts concrete pavement to be rubblized in a subsequent stage, sawcut the concrete full-depth.
E.Rubblization Plan. Submit a rubblization plan to the RE 15 days before beginning rubblizing operations that includes the following:
1.Condition of existing subsurface facilities as determined in 305.03.01.A.
2.Rubblization method and associated equipment.
3.Seating method and associated equipment.
4.Rubblizing and paving sequence for the Project.
5.Method for locating grade corrections and placing DGA as specified in 305.03.01.J.
6.Method for protecting subsurface facilities.
7.Dust mitigation measures.
8.Method for performing a survey of the condition of the existing subsurface facilities after the rubblization operations. Do not begin test strip until the RE accepts this plan. Submit an adjusted rubblization plan before making adjustments to the operation.
F.Test Strip. Before beginning rubblizati on, the RE will designate a 500 foot long, full lane width, or an area of approximately 600 square yards, for the test strip. Rubblize the test strip using varying intensities of energy until a technique is established that will rubblize the pavement as specified. At a location determined by the RE, excavate a full depth, 3 foot wide test pit for the full width of the test strip to determine that the breaker is producing pieces of the specified sizes. The RE may require additional test holes. Use DGA to backfill excavated areas. Place DGA in lifts and compact using the density control method as specified in 203.03.02.B.4. If required results are not being obtained, cease rubblizing operations and submit an alternate rubblization plan capable of obtaining the specified results to the RE. Resume rubblizing operations upon acceptance of the alternate plan. Repeat this procedure as necessary to obtain the specified results.
G.Rubblizing. Rubblize the pavement full-depth in a manner that eliminates all slab act ion by fracturing into pieces 3 inches or less in any dimension in the top third of the pavement and 12 inches or less in any dimension in the bottom two-thirds of the pavement. Prevent rubblized debris from entering an active traffic lane. Rubblize in partial widths when ne cessary to maintain traffic as shown on the Plans. In areas where the roadway must be overlaid 1 lane at a time, extend initial rubblization a minimum of 6 inches beyond the width of the pavement to be overlaid. For the resonant method begin at a free edge or previously broken edge and progress toward the opposite shoulder or longitudinal centerline of the road. When necessary, overlap passes to achieve rubblization. Continuously monitor rubblization to ensure that the operation is achieving the specified results. Notify the RE of adjustments that may be required. The RE may require additional test holes to ensure that pieces are free of bond with reinforcement and to ensure that the pavement is being rubblized to the specific dimensions.
H.Seating. Seat rubblized pavement with rollers operating at a speed not exceeding 2 1/2 miles per hour. Seat rubblized pavement using the applicable method:
1.Resonant Method. Roll the rubblized pavement with a minimum of 3 passes over the entire width of the rubblized pavement with a vibratory roller.
2.Multi-Head Method. Roll the entire width of the rubblized pavement with 2 passes of a “Z -Grid” roller, followed by 2 passes of a smooth drum vibratory roller. The RE may require additional passes in order to seat the rubblized pavement and provide a smooth surface that is ready for the HMA overlay. If the rubblized pavement becomes unstable due to excess moisture, cease rolling until the RE allows the operation to resume.
I.Removing Exposed Reinforcement Steel and Transverse Joint Assemblies. For reinforced concrete pavement, leave debonded reinforcement steel in place unless exposed. Cut exposed reinforcement steel 1 inch below the surface and remove. Remove exposed transverse joint assemblies. Remove exposed joint filler, expansion materials, or other similar items. Patch deficiencies left by removing joint assemblies as specified in 305.03.01.J.
J.Patching and Leveling with DGA. At the direction of the RE, remove unstable material full depth and replace with DGA. Compact DGA in lifts using the directed method as specified in 203.03.02.B.3. If the seated rubblized pav ement is more than 1 1/2 inch below grade, correct with DGA as approved by the RE. Place DGA and compact using the directed method as specified in 203.03.02.B.3.
K.Repairing Subsurface Facilities. If damage occurs to subsurface facilities during rubblization, immediately cease operations, notify the RE, and repair the damage as directed by the RE.
L.Final Subsurface Facili ty Survey. Perform a final survey of the subsurface facilities after completion of rubblization and submit to the RE. Repair damage as directed by the RE.
M.Protecting Rubblized Pavement from Damage. Protect the rubblized pavement from contamination and damage. Correct areas of the rubblized pavement damaged by construction operations or contamination before placing HMA. Only allow equipment on the rubblized pavement that is necessary for the construction of the subsequent pavement course. Ensure that no more than 48 hours elapse between rubblizing the pavement and the placement of the first lift of the HMA overlay. If precipitation occurs before placing the HMA overlay, the RE may extend the time restriction to allow the rubblized pavement to dry.
305.04 Measurement and Payment
The Department will measure and make payment for Items as follows: Item Pay Unit RUBBLIZATION SQUARE YARD The Department will measure EXCAVATION, UNCLASSIFIED in unstable areas by the cubic yard of material actually excavated in the work. The Department will make payment for EXCAVATION, UNCLASSIFIED as specified in 202.04. The Department will measure DGA used for DGA patching and leveling by the cubic yard of material actually used in the work. The Department will make p ayment for DENSE-GRADED AGGREGATE BAS E COURSE, VARIABLE THICKNESS as specified in 302.04.
Referenced in this section
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Source: Standard Specifications for Road and Bridge Construction, 2019 (rev. 2022-12-21) Edition. Pages 181–183 of 651. View official source ↗