Attachment 2 - SPECIFICATIONS - SEALING.pdf

SPECIFICATIONS

SEALING AND RESEALING JOINTS AND RANDOM CRACKS IN CONCRETE

PAVEMENTS

PART 1 - GENERAL

1.1 REFERENCES

The Federal Specification (Fed. Spec.) listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designations only.

American Society for Testing and Materials (ASTM) Publications:

ASTM D 5893/D 5893M (2016) Standard Specification for Cold Applied, Single

Component, Chemically curing Silicone Joint Sealant for Portland

Cement Concrete Pavements

Unified Facilities Guide Specifications (UFGS):

UFGS 32 01 19.61 Sealing of Joints in Rigid Pavement (November 2019)

Engineering Technical Letter (ETL):

ETL 02-8 Silicone Joint Sealant Specification for Airfield Pavements

1.2 EQUIPMENT

Machines, tools, and equipment used in the performance of the work required by this section will be approved before the work is started and will be maintained in satisfactory condition.

1.2.1 Joint-Cleaning Equipment

1.2.1.1 Tractor-Mounted Routing Tool

Routing tool for removing old sealant from the joints will be of such shape and dimensions and so mounted on the tractor that it will not damage the sides of the joints and can be adjusted to remove the old material to the depth indicated. The use of V-shaped tools or rotary impact routing devices will not be permitted for cleaning joints, but may be used to clean and enlarge random cracks.

1.2.1.2 Concrete Saw

A self-propelled power saw with water-cooled diamond or abrasive saw blades will be provided for cutting joints for the widths and depths specified, or for refacing joints where surface films of old sealants cannot be readily removed by sandblasting.

1.2.1.3 Sandblasting Equipment

Sandblasting equipment will include an air compressor, hose, and venturi-type nozzles of sufficient capacity to furnish air at a rate of not less than 150 cfm and to maintain a line pressure of not less than 90 psi at the nozzle while in use. The compressor will be equipped with traps that maintain the compressed air free of oil and water.

1.2.1.4 High-Pressure Water Jet

High-pressure water jet equipment will include trailer-mounted water tank, pumps, high-pressure hose, wands with safety release cutoff controls, nozzles, and auxiliary water resupply equipment.

Water tank and auxiliary resupply equipment will be of sufficient capacity to permit continuous operations. Pumps, hoses, wands, and nozzles will be of such design, and operate at such water pressure and rate of discharge, to clean the bottom and both walls of the joint, and the pavement surface on both sides of the joint for a width of at least 1/2 inch. A pressure gage will be mounted at the pump which will show at all times the pressure in pounds per square inch at which the equipment is operating.

1.2.1.5 Compressed Air

The air compressor will be capable of furnishing not less than 150 cfm and to maintain a line pressure of not less than 90 psi at the nozzle while in use. The compressor will be equipped with traps that maintain the compressed air free of oil and water.

1.2.2 Sealing Equipment

1.2.2.1 Cold-Applied Sealant Equipment

The equipment for proportioning, mixing, and installing Type IV-M two-component, cold-applied joint sealants will be designed for delivering two semifluid components through hoses to a portable mixer at a preset ratio of 1 to 1 (by volume) by positive displacement, with an accuracy of plus or minus 5 percent for the quantity of each component. The reservoirs for each component will be equipped with mechanical agitation devices that will maintain the components in a uniform condition without entrapping air. Provisions will be incorporated to permit thermostatically controlled indirect heating of the components when required; however, immediately prior to proportioning and mixing, the temperature of either component must not exceed 90 degrees F. Screens will be provided near the top of each reservoir to eliminate any foreign particles or partially polymerized material that could clog fluid lines or otherwise cause misproportioning or improper mixing of the two components. The equipment will be capable of thoroughly mixing the two components. Before using the equipment in this work, the Contractor will furnish the supplier's certification that the specific equipment model and serial number is recommended for use with the sealing compound to be installed. The initially approved equipment will be maintained in good working condition in all respects, serviced in accordance with the supplier's instructions, and will not be altered in any way without obtaining prior approval.

1.3. SAMPLING AND TESTING

1.3.1 Applicable Joints

Only joint sealant used on the airfield will be tested as described below.

1.3.2 Sampling and Testing Procedures

Joint sealants will be tested for conformance with the referenced applicable material specification. Joint sealants will be tested by the Government. Testing will be performed by the

U.S. Army Engineer Waterways Experiment Station (WES).

The Contractor will not be allowed to start any work identified under this contract until the Government has a certified copy of the test report which indicates the sealant and primer conforms to specified requirements. No material will be used at the project prior to receipt by the

Contractor of written notice that the material meets the laboratory requirements. The cost of the first test of samples from each lot of joint sealant will be borne by the Government. If the sample fails to meet specification requirements, the material represented by the sample will be replaced, and the new material will be tested. Cost of sampling and testing the new material will be borne by the Contractor. If the use of a primer is recommended for the proposed sealing system, the laboratory test for bond will be conducted using the primer in accordance with the manufacturer's instructions. The Contractor will furnish samples of materials directly to U.S.

Army Corps of Engineers, Waterways Experiment Station (CE-WES-GP-Q), 3909 Halls Ferry

Road, Vicksburg, MS 39180-6199. The Contractor will submit five gallons of each component and one quart of primer if recommended by manufacturer of sealant material. Each sample submitted to the WES will be clearly labeled with the manufacturers name, lot number, Federal

Specification under which it was manufactured, contract number, project number, and the base name where the material will be applied.

1.3.3 Trial Joint Sealant Installation

Prior to the cleaning and resealing of joints for the entire project, the Contractor will select a length of not less than 400 feet of joint in an approved location and clean and reseal the joint with the specified sealant in a manner proposed for resealing joints for the entire project.

Following the resealing of the 400-foot trial length, and before any other joint is resealed, the trial joint installation will be inspected to determine that the sealant and installation meet the requirements specified. If it is determined that the material or installation do not meet the specified requirements, the Contractor will remove the sealant and reclean and reseal the joint at no additional cost to the Government. After approval of the 400-foot trial joint, all other joints will be cleaned and resealed in the same manner.

1.4. SUBMITTALS

Prior to submitting material for testing, the manufacturer technical data must be submitted and approved. Where installation procedures or any part thereof are required to be in accordance with the recommendations of the manufacturer of the materials, printed copies of these recommendations will be furnished prior to use on the project. Installation of the material will not be allowed until the recommendations are received and approved.

1.5 DELIVERY AND STORAGE

Materials delivered to the site will be inspected for damage, unloaded, and stored with a minimum of handling. Materials will be handled in such a manner that joint sealant materials will not be damaged. Storage facilities will be provided by the Contractor at the jobsite for maintaining materials at temperatures recommended by the manufacturer.

PART 2 - PRODUCTS

2.1 SEALANTS

Sealants must conform to the following requirements: Non-sag silicone material conforming to

ASTM D5893/D5893M.

2.2 PRIMERS

The use of primers when recommended by the manufacturer of the proposed sealant is authorized in accordance with the manufacturer's instructions.

2.3 SEPARATING AND BLOCKING MEDIUM

The separating and blocking material used to seal off the lower portion of the joint will be a readily compressible, nonshrinkable rope plastic or rubber not reactive with the sealant. The separating and blocking medium will not soften or melt at pouring temperature of the sealant.

PART 3 - EXECUTION

3.1 PREPARATION OF JOINTS

Joints will be prepared for resealing as follows.

3.1.1 Existing Sealant Removal

The in-place sealant will be cut loose from both joint faces and to the depth shown on the drawings, using the tractor-mounted routing equipment specified in paragraph 1.2

EQUIPMENT. Depth will be sufficient to accommodate any separating and/or blocking medium used to maintain the depth of new sealant to be installed. Prior to further cleaning operations, all loose old sealant remaining in the joint opening will be completely removed by blowing with compressed air.

3.1.2 Refacing of Joints

Refacing of joints will be accomplished using a power-driven concrete saw with diamond or abrasive blades to remove all residual old sealant and a minimum of concrete from the joint faces to provide exposure of newly cleaned concrete to the width and depth shown on the drawings. A sufficient number of used or dummy blades will be mounted on the same arbor as the cutting blade to assist in straight-line sawing and to provide stiffness to avoid blade distortion.

Immediately following the sawing operation, the joint faces and opening will be thoroughly cleaned using a water jet to remove all saw cuttings or debris remaining on the faces or in the joint opening.

3.1.3 Refacing of Joints (Alternate Method)

All sealant still adhering to the joint faces will be removed by making additional passes with the router, as necessary. Spalling of concrete or widening of the joint opening will not be permitted.

3.1.4 Sandblast Cleaning

The newly exposed concrete joint faces and the pavement surfaces extending about 1/2 inch from the joint edges will be sandblast cleaned. A multiple-pass technique will be used until the surfaces are free of any traces of old sealant and free of saw-cutting fines that might prevent bonding of the sealant to the concrete. After final cleaning and immediately prior to sealing, the joints will be blown out with compressed air and left completely free of sand and water.

3.1.5 High-Pressure Water Jet Cleaning

The in-place sealant will be removed from both joint faces and to the depth shown on the drawings, using the high-pressure water jet equipment specified in paragraph 1.2 EQUIPMENT.

Depth of removal will be sufficient to accommodate any separating and blocking medium used to maintain the depth of new sealant to be installed. All loose old sealant not removed by the water jet will be completely removed by blowing with compressed air. Loosening of the sealer with a router to facilitate water jet cleaning is permissible.

3.2 PREPARATION OF SEALANT

Type IV-M cold-applied sealant components and containers will be inspected by the Contractor and the Contracting Officer prior to use, and any materials that contain water, hard caking of any separated constituents, nonreversible jell, or materials that are otherwise unsatisfactory will be rejected. Settlement of constituents in a soft mass that can be readily and uniformly remixed in the field with simple tools will not be cause for rejection. Prior to transfer of components from the shipping containers to the appropriate reservoirs of the application equipment, the materials in the shipping containers will be thoroughly mixed to insure homogeneity of the components and incorporation of all constituents at the time of transfer. When necessary for remixing prior to transfer to the application equipment reservoirs, the components of the sealant will be warmed to a temperature not exceeding 90 degrees F. by placing the components in heated storage or by other approved methods, but in no case will the components be heated by direct flame, or in a single-walled kettle, or a kettle without oil bath.

3.3 INSTALLATION OF SEALANT

3.3.1 Time of Application

Joints will be sealed immediately following final cleaning of the joint walls and following the placement of separating media. The concrete walls of the joint will be surface dry, and the atmospheric temperature and pavement temperature within the joint opening will both be above

50 degrees F. and rising at the time of application of the sealant. Open joints ready for resealing that cannot be sealed under the conditions specified or when rains interrupt sealing operations will be blown out and allowed to dry prior to installing the sealant.

3.3.2 Sealing Joints

No joint sealant will be installed until the cleaned joints have been inspected and approved. The joints will be filled from the bottom up to within 1/4 inch of the pavement surface, plus 1/8 inch minus 0 inch, using equipment specified in paragraph 1.2 EQUIPMENT for the type of sealant to be installed. Excess or spilled sealant will be removed from the pavement by approved methods and will be discarded. Traffic will not be permitted over newly sealed pavement until authorized by the Contracting Officer. In no case will sealant be installed using gravity methods and pouring pots. When a primer is supplied by the manufacturer of a sealant, it will be applied evenly to the joint faces in accordance with the manufacturer's recommendations. When Type

IV-M cold-applied sealant is used, the proportioning of the equipment will be checked at the beginning of each day's operation and every 4 hours to determine that the preset volume output for each component is being maintained. Material used for these checks may be returned to the proper component reservoir. Joints will be checked frequently to insure that the newly installed sealant is cured to a tack-free condition within 3 hours.

3.4 INSPECTIONS

3.4.1 Joint Inspection

Joints will be inspected during cleaning to correct improper equipment and cleaning techniques that widen, develop, or increase V-shaped cross section, or spall concrete. Cleaned joints will be approved prior to installing joint sealant.

3.4.2 Sealing Inspection

Application equipment will be inspected to assure conformance to temperature requirements, proper proportioning and mixing, and installation. Evidences of bubbling, improper installation, failure to cure or set will be cause to suspend operations until causes of deficiencies are determined and corrected.

3.4.3 Sealant Inspection

Sealant will be inspected for proper rate of cure and set, bonding to concrete surfaces of joint walls, cohesive separation within the sealant, reversion to liquid, entrapped air, and voids.

Sealants exhibiting any of these deficiencies will be rejected. Sealant may be rejected at any time prior to final acceptance of the project. Sealant which is rejected will be removed from the joint, wasted, and replaced in a manner satisfactory to the Contracting Officer at no additional cost to the Government.

END OF SECTION