Atch_05_Spec_Section_32_01_17_Crack_Sealing.doc

MAINTAIN/REPAIR PAVEMENTS IDIQ

IFB No.: F26600-99-R-C118

RKMF 98-0105

Contract No.:

PAVING IDIQ

Solicitation: FA4861-16-R-A300

SECTION 32 01 17

SEALING OF CRACKS IN BITUMINOUS PAVEMENT

1. PART 1 - GENERAL

1.1. APPLICABLE PUBLICATIONS: The American Society for Testing and Materials (ASTM) publications listed below forms a part of this specification to the extent referenced.

ASTM C 509

(1994) Cellular Elastomeric Preformed Gasket and

Sealing Material

ASTM D 789

(1994) Determination of Relative Viscosity, Melting Point, and Moisture Content of Polyamide

ASTM D 3405

(1994) Sealant, Joint, Non-Jet-Fuel Resistant, Hot-applied, for Portland Cement and Asphalt Concrete Pavements

1.2. SUBMITTALS: Product information on the proposed sealant to be used shall be submitted and gain Government approval prior to use on the jobsite. Samples may be retained by the Government for possible future testing should the materials appear defective during or after application.

1.3. EQUIPMENT: Machines, tools and equipment used in the performance of the work required by this section are subject to inspection before the work is started and shall be maintained in satisfactory condition at all times.

1.3.1. The routing equipment shall be a self-powered machine operating a power-driven tool or bit specifically designed for routing bituminous pavements. The bit shall rotate about a vertical axis at sufficient speed to cut a smooth vertical walled reservoir. The router shall be capable of following the trace of the crack without deviation. The use of rotary impact routing devices may be permitted if vertical sided carbide-tipped bits are used.

1.3.2. A self-propelled concrete power saw with small diameter (6 inches or less) water-cooled diamond or abrasive saw blades will be provided for cutting cracks to the depths and widths specified and for removing filler that is embedded in the cracks or adhered to the crack faces. The diameter of the saw blade will be small enough to allow the saw to closely follow the trace of the crack.

1.3.3. Sandblasting equipment shall include an air compressor, hose and long-wearing venturi-type nozzle of proper size, shape and opening. The maximum nozzle opening should not exceed 1/4 inch. The air compressor shall be portable and shall be capable of furnishing not less than 90 psi at the nozzle while in use. Compressor capability under job conditions must be demonstrated before approval. The compressor shall be equipped with traps that will maintain the compressed air free of oil and water. The nozzle shall have an adjustable guide that will hold the nozzle aligned with the crack about 1 inch above the pavement surface. The height, angle of the inclination and the size of the nozzle shall be adjusted as necessary to secure satisfactory results.

1.3.4. Waterblasting equipment shall include a trailer-mounted water tank, pumps, high-pressure hose, wand with safety release cutoff control, nozzle, and auxiliary water resupply equipment. The water tank and auxiliary resupply equipment shall be of sufficient capacity to permit continuous operations. The hose, wand, and nozzle shall be capable of cleaning the crack faces and the pavement surface on both sides of the crack for a width of at least 1/2 inch. A pressure gauge mounted at the pump shall show at all times the pressure in pounds per square inch at which the equipment is operating.

1.3.5. Hand tools may be used, when approved, for removing defective sealant from a crack and repairing or cleaning the crack faces.

1.3.6. The unit applicators used for heating and installing the hot-poured crack sealant materials shall be mobile and shall be equipped with a double-boiler, agitator-type kettle with an oil medium in the outer space for heat transfer; a direct-connected pressure-type extruding device with a nozzle shape for inserting in the crack to be filled; positive temperature devices for controlling the temperature of the transfer oil and sealant; and a recording-type thermometer for indicating the temperature of the sealant. The applicator unit shall be so designed that the sealant will circulate through the delivery hose and return to the inner kettle when not in use.

1.4. CRACK SEALANT INSTALLATION TEST SECTION: Prior to the cleaning and sealing of the cracks for the entire project, a test section at least 20 feet long shall be prepared using the specified materials and approved equipment, so as to demonstrate the proposed sealing of all cracks of the project. Following the completion of the test section and before any other crack is sealed, the test section shall be inspected to determine that the materials and installation meet the requirements specified. If materials or installation do not meet requirements, the materials shall be removed and the cracks recleaned and resealed at no cost to the Government. When the test section meets the requirements, it may be incorporated into the permanent work. All other cracks shall be sealed in the manner approved for sealing the test section.

1.5. DELIVERY AND STORAGE: Materials delivered to the jobsite shall be inspected for defects, unloaded, and stored with a minimum of handling to avoid damage. The contractor shall provide storage facilities at the jobsite to protect materials from weather and to maintain them at the temperatures as recommended by the manufacturer.

1.6. ENVIRONMENTAL CONDITIONS: The ambient air temperature and the pavement temperature within the joint wall shall be a minimum of 50 degree F and rising at the time of application of the materials. Sealant shall not be applied if moisture is observed in the crack.

2. PART 2 – PRODUCTS

2.1. SEALANTS: Sealants shall conform to ASTM-D-3405. Backup material shall be a compressible, nonshrinking, nonstaining, nonabsorptive material and shall be nonreactive with the crack sealant. The melting point of the backing material must be at least 5 degrees F greater than the maximum pouring temperature of the sealant being used when tested in accordance with ASTM D 789. The material shall have a water absorption of not more than 5 percent by weight when tested in accordance with ASTM C 509. The percent absorption shall be calculated using the formula below:

A = W - D x 100

D where

A = water absorption, percent

W = weight of the sample, grams

D = dry weight of the sample, grams

The backup material shall be 25, plus or minus 5 percent, larger in diameter than the nominal width of the crack.

3. PART 3 – EXECUTION

3.1. PREPARATION OF CRACKS:

3.1.1. Immediately before the installation of the crack sealant, the cracks shall be thoroughly cleaned to remove oxidized pavement, loose aggregate and foreign debris. The preparation shall be as follows:

3.1.2. Small cracks that are less than 3/16" wide do not need to be sealed unless the edges of the crack are badly spalling.

3.1.3. Cracks that are 3/16 to 3/4 inch wide shall be routed out to a nominal width 1/8 inch greater than the existing nominal width and to a depth not less than 3/4 inch, cleaned using compressed air.

3.1.4. Large cracks that are 3/4 to 2 inches wide shall be sandblasted and cleaned using compressed air. All cracks larger than 2 inches shall be repaired using pavement repair techniques instead of sealing; there are not any cracks of this size in this project.

3.1.5. Routing of the cracks shall be accomplished using a rotary router with a bit that is at least 1/4 inch wider than the nominal width of the crack to remove all residual old sealant (resealing), oxidized pavement and any loose aggregate in the crack wall.

3.1.6. Sawing of the cracks shall be accomplished using a power-driven concrete saw as specified in paragraph 1.3 EQUIPMENT. The blade shall be stiffened as necessary with suitable dummy (or used) blades or washers. Immediately following the sawing operation, the crack opening will be thoroughly cleaned using compressed air to remove all saw cuttings and debris.

3.1.7. Sandblast the crack faces and the pavement surfaces extending a minimum of 1/2 inch from the crack edges. A multiple-pass technique shall be used until the surfaces are free of dust, dirt, old sealant residue, or foreign debris that might prevent the sealant material from bonding to the asphalt pavement. After final cleaning and immediately prior to sealing, the cracks shall be blown out with compressed air and left completely free of debris and water. Care must be exercised when sandblasting to prevent damaging the pavement.

3.1.8. Backup material shall be used on all cracks that have a depth greater than 3/4 inch. The backup material shall be inserted into the lower portion of the crack as shown on the drawings. Care shall be taken to insure that the backup material is placed at the specified depth and is not stretched or twisted during installation.

3.1.9. The stages of crack preparation which include routing, sandblasting of the crack faces, compressed-air cleaning and placing of the backup material shall be limited to only that linear footage that can be sealed during the same day.

3.2. PREPARATION OF SEALANT: Hot-poured sealants shall not be heated in excess of the safe heating temperature recommended by the manufacturer as shown on the sealant containers. Sealant that has been overheated or subjected to application temperatures for over 4 hours that has remained in the applicator at the end of the day's operation shall be withdrawn and wasted.

3.3. INSTALLATION OF SEALANT:

3.3.1. Cracks shall be sealed immediately following final cleaning of the crack walls and following the placement of the backup material (when required). Cracks that cannot be sealed under the conditions specified, or when rain interrupts sealing operations shall be recleaned and allowed to dry prior to installing the sealant.

3.3.2. Immediately preceding, but not more than 50 feet ahead of the crack sealing operations, a final cleaning with compressed air shall be preformed. The cracks shall be filled from the bottom up to the pavement surface. Excess or spilled sealant shall be removed from the pavement by approved methods and shall be discarded. The sealant shall be installed in such a manner as to prevent the formation of voids and entrapped air. Several passes with the applicator wand may be necessary to obtain the specified sealant depth from the pavement surface. In no case shall gravity methods or pouring pots be used to install the sealant material. Traffic shall not be permitted over newly-sealed pavement until authorized by the Contracting Officer. Cracks shall be checked frequently to insure that the newly-installed sealant is cured to a tack-free condition within 3 hours.

3.3.3. Upon completion of the project, all used materials shall be removed from the site and the pavement shall be left in a clean condition.

3.4. QUALITY CONTROL PROVISIONS:

3.4.1. Quality control provisions shall be provided during the crack cleaning process to correct improper equipment and cleaning techniques that damage the bituminous pavement in any manner. Cleaned cracks shall be approved by quality control/assurance personnel prior to installation of the crack sealant.

3.4.2. The application equipment shall be inspected to ensure conformance to temperature requirements and proper installation. Evidences of bubbling, improper installation, failure to cure or set shall be cause to suspend operations until causes of the deficiencies are determined and corrected.

3.4.3. The crack sealant shall be inspected for proper rate of cure and set, bonding to the bituminous pavement, cohesive separation within the sealant, reversion to liquid, entrapped air and voids. Sealants exhibiting any of these deficiencies at any time prior to the final acceptance of the project shall be removed from the crack, wasted, and replaced as specified herein at no additional cost to the Government.

3.5. UNIT PRICES

3.5.1. Measurement: The quantity of each resealing item to be paid for shall be determined by actual measurement of the number of linear feet of in-place material that has been approved by the Contracting Officer.

3.5.2. Payment: Payment shall be made at the contract unit bid prices per linear foot for the sealing items scheduled. The unit bid prices shall include the cost of all labor, materials, and the use of all equipment and tools required to complete the work.

END OF SECTION

Page 32 01 17-1 (22 Mar 99)

Crack Sealing

Page 32 01 17-1 (7 Feb 2016)