32 01 19.61.pdf

East Branch, Miscellaneous Dam Area Improvements

SECTION TABLE OF CONTENTS

DIVISION 32 - EXTERIOR IMPROVEMENTS

SECTION 32 01 19.61

CLEANING AND RESEALING EXPANSION JOINTS

PART 1 GENERAL

1.1 SUBMITTALS

1.2 GENERAL REQUIREMENTS

1.3 QUALIFICATIONS

1.4 TEST REQUIREMENTS

1.5 EQUIPMENT

1.5.1 Joint Cleaning Equipment

1.5.1.1 Sandblasting Equipment

1.5.1.2 Waterblasting Equipment

1.5.1.3 Hand Tools

1.5.2 Sealing Equipment

1.6 TRIAL JOINT SEALANT INSTALLATION

1.7 DELIVERY AND STORAGE

1.8 ENVIRONMENTAL CONDITIONS

PART 2 PRODUCTS

2.1 SEALANTS

2.2 PRIMERS

2.3 BACKUP AND BOND BREAKER MATERIALS

PART 3 EXECUTION

3.1 PREPARATION OF JOINTS

3.1.1 Existing Sealant Removal

3.1.2 Sandblasting and Waterblasting

3.1.3 Back-Up Material

3.1.4 Rate of Progress of Joint Preparation

3.1.5 Diversion of Water

3.2 PREPARATION OF SEALANT

3.3 INSTALLATION OF SEALANT

3.3.1 Time of Application

3.3.2 Sealing Joints

3.4 INSPECTION

3.4.1 Joint Cleaning

3.4.2 Sealant Application Equipment

3.4.3 Sealant

3.5 CLEAN-UP

-- End of Section Table of Contents --

SECTION 32 01 19.61 Page 1 W911WN-09-B-0017 Revised by Amendment 0001

SECTION 32 01 19.61

CLEANING AND RESEALING EXPANSION JOINTS

PART 1 GENERAL

1.1 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. The following shall be submitted in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Construction Equipment List; G, RE

List of proposed equipment to be used in performance of construction work including descriptive data, 30 days prior to use on the project.

SD-04 Samples

Materials; G, ED

Samples of the materials (sealant, primer, and backup material), in sufficient quantity for testing and approval 60 days prior to the beginning of work. No material will be allowed to be used until it has been approved.

SD-07 Certificates

Qualifications; G, RE

Qualification and experience of the firm performing the joint repairs shall be submitted for approval.

SD-08 Manufacturer's Instructions

Manufacturer's Recommendations

Where installation procedures, or any part thereof, are required to be in accordance with the manufacturer's recommendations, printed copies of these recommendations shall be submitted 30 days prior to use on the project. Installation of the material will not be allowed until the recommendations are received. Failure to furnish these recommendations can be cause for rejection of the material.

1.2 GENERAL REQUIREMENTS

The limits of joint repair are shown on contract drawings. Joint repair shall consist of removing existing joint filler material and sealant to the extent specified and resealing the joints.

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1.3 QUALIFICATIONS

The joint repair shall be performed by a firm having at least five years experience in the installation of similar joint sealing materials. The Contractor shall submit evidence of this experience prior to the installation of sealant materials specified in this section.

1.4 TEST REQUIREMENTS

The joint sealant and backup or separating material shall be tested for conformance with the referenced applicable material specification. Testing of the materials shall be performed in an approved independent laboratory and certified copies of the test reports shall be submitted and approved 60 days prior to the use of the materials at the job site. Samples will be retained by the Government for possible future testing should the materials appear defective during or after application. Conformance with the requirements of the laboratory tests specified will not constitute final acceptance of the materials. Final acceptance will be based on the performance of the in-place materials.

1.5 EQUIPMENT

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

1.5.1 Joint Cleaning Equipment

1.5.1.1 Sandblasting Equipment

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 150 cubic feet per minute and maintaining a line pressure of 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 joint approximately 1 inch above the pavement surface. The height, angle of inclination and the size of the nozzle shall be adjusted as necessary to secure satisfactory results.

1.5.1.2 Waterblasting Equipment

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 nozzle shall have an adjustable guide that will hold the nozzle aligned with the joint approximately 1 inch above the pavement surface. The height, angle of inclination and the size of the nozzle shall be adjustable as necessary to obtain satisfactory results. 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.

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1.5.1.3 Hand Tools

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

1.5.2 Sealing Equipment

The dimension of the nozzle shall be such that the tip of the nozzle will extend into the joint to allow sealing from the bottom of the joint to the top. The initially approved equipment shall be maintained in good working condition, serviced in accordance with the supplier's instructions, and shall not be altered in any way without obtaining prior approval. Small hand-held air-powered equipment (i.e., caulking guns) may be used.

1.6 TRIAL JOINT SEALANT INSTALLATION

Prior to the cleaning and sealing of the joints for the entire project, a test section of at least 20-foot long joint shall be prepared by each worker who will be performing joint sealing work, using the specified materials and approved equipment, so as to demonstrate the proposed joint preparation and sealing of all types of joints in the project. Following the completion of the test section and before any other joint is sealed, the test sections shall be inspected to determine that the materials and installation meet the requirements specified. If it is determined that the materials or installation do not meet the requirements, the materials shall be removed, and the joints shall be recleaned and resealed at no cost to the Government. When the test section meets the requirements, it may be incorporated into the permanent work and paid for at the contract unit price per linear foot for sealing items scheduled. No other cleaning and sealing work shall be performed by any worker until the test installation by that worker is approved by the Contracting Officer. All other joints shall be prepared and sealed in the manner approved for sealing the test section.

1.7 DELIVERY AND STORAGE

Materials delivered to the job site shall be inspected for defects, unloaded, and stored with a minimum of handling to avoid damage. Storage facilities shall be provided by the Contractor at the job site for maintaining materials at the temperatures and conditions recommended by the manufacturer.

1.8 ENVIRONMENTAL CONDITIONS

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

PART 2 PRODUCTS

2.1 SEALANTS

Materials for sealing expansion joints in the concrete slope lining and walls shall comply with the requirements specified in Section 32 13 00

CONCRETE PAVEMENT.

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2.2 PRIMERS

Primers shall be as recommended by the manufacturer of the sealant.

2.3 BACKUP AND BOND BREAKER MATERIALS

The backup material and bond breaker shall conform to the requirements of Section 32 13 00 CONCRETE PAVEMENT.

PART 3 EXECUTION

3.1 PREPARATION OF JOINTS

Immediately before the installation of the sealant, the joints shall be thoroughly cleaned to remove all laitance, filler, and old sealant from the sides and upper edges of the joint space to be sealed. Joints shall be cleaned to sufficient depth to remove all loose material and debris and to permit placement of the backup material and sealant as shown on the drawings. Concrete surfaces shall be dry at the time of sealant application.

3.1.1 Existing Sealant Removal

The in-place sealant and expansion joint material shall be cut loose from both joint faces and to the a minimum depth required to permit placement of the backup material and sealant depth equal to 1/2 inch or as recommended by the sealant manufacturer unless otherwise shown on the drawings, using the waterblaster as specified in paragraph EQUIPMENT. Previous experience at the project has indicated that removal is most efficiently accomplished using high pressure water jet with abrasive added. Depth shall be sufficient to accommodate any separating or backup material that is required to maintain the depth of new sealant to be installed. Prior to further cleaning operations, all loose old sealant remaining in the joint opening shall be removed by blowing with compressed air. Chipping, spalling, or otherwise damaging the concrete will not be allowed.

3.1.2 Sandblasting and Waterblasting

The newly exposed concrete joint faces and the pavement surfaces extending a minimum of 1/2 inch from the joint edges shall be sandblasted or waterblasted clean. A multiple-pass technique shall be used until the surfaces are free of dust, dirt, filler, old sealant residue, or any foreign debris that might prevent the bonding of the sealant to the concrete. After final cleaning and immediately prior to sealing, the joints shall be blown out with compressed air and left completely free of debris and water.

3.1.3 Back-Up Material

The lower portion of the joint opening shall be plugged or sealed off using a back-up material to prevent the entrance of the sealant below the specified depth. Care shall be taken to ensure that the backup material is placed at the specified depth and is not stretched or twisted during installation. Bond breaker shall be installed over the back-up material.

3.1.4 Rate of Progress of Joint Preparation

The stages of joint preparation which include sandblasting or waterblasting, air pressure cleaning and placing of the back-up material shall be limited to only that lineal footage that can be sealed during the

SECTION 32 01 19.61 Page 5 same day.

3.1.5 Diversion of Water

The Contractor shall be responsible for diverting water away from the joints being cleaned and sealed by placing a temporary sandbag dike or other approved methods. The water shall be diverted for a sufficient time to permit cleaning and sealing of the joint and curing of the sealant. Any sealant damaged by surface water prior to curing shall be removed and new sealant shall be placed. All temporary diversion measures shall be completely removed upon completion of the work for which they were installed.

3.2 PREPARATION OF SEALANT

Storage and application of the sealant shall be in accordance with the manufacturer's written safety instructions and precautions.

3.3 INSTALLATION OF SEALANT

3.3.1 Time of Application

Joints shall be sealed immediately following final cleaning of the joint walls and following the placement of the separating or backup material.

Open joints 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 Sealing Joints

Immediately preceding, but not more than 50 feet ahead of the sealing operations, a final cleaning with compressed air shall be performed. The joint surfaces shall be dry at the time the sealant is installed. Primer shall be applied evenly to the joint faces in accordance with the manufacturer's instructions after placement of the back-up material. Bond breaker material shall be placed after the primer is applied. The joints shall be filled from the bottom up to the bottom of the beveled edge.

Depth of sealant shall be 1.5 times the joint width or as recommended by the sealant manufacturer. Sealing of joints shall commence at the bottom of the slope or wall and continue up the concrete slope lining or wall.

Excess or spilled sealant shall be removed from the concrete surface 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. In no case shall gravity methods or pouring pots be used to install the sealant material. Joints shall be checked frequently to ensure that the newly installed sealant is cured to a tack-free condition within the time specified. The sealant shall be tooled concave immediately after application.

3.4 INSPECTION

3.4.1 Joint Cleaning

Joints shall be inspected during the cleaning process to correct improper equipment and cleaning techniques that damage the concrete pavement in any manner. Cleaned joints shall be approved prior to installation of the separating or back-up material and sealant.

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3.4.2 Sealant Application Equipment

The application equipment shall be inspected to ensure conformance to 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 Sealant

The sealant shall be inspected for proper rate of cure and set, bonding to the joint walls, 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 joint, wasted, and replaced as specified herein at no additional cost to the Government.

3.5 CLEAN-UP

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

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SECTION 32 01 19.61 Page 7

1.5.2 Sealing Equipment

3.5 CLEAN-UP