DETECTOR LOOP INSTALLATION:   The following specification covers the use of Elastic Cement and Elastic Cement AC for Detector Loop Installation in concrete and asphalt.  Illinois Department of Transportation specification for Detector loop Installation is also included.


SPECIFICATION
DETECTOR LOOP INSTALLATION
USING RAPID SET RESIN
1. GENERAL REQUIREMENTS

1.1 SCOPE
1.1.1 This work consists of installation of traffic detector loops in accordance with the requirements of Section ( Insert ) of the Standard Specifications, except as follows:

2. MATERIALS
2.1 Loop Sealer
Loop sealer shall be a rapid setting urethane resin. The resin shall have two liquid components mixed in equal volumes. Component A shall consist of aromatic polyisocyanates and petroleum hydrocarbons. Component B shall consists of polyols, catalysts and petroleum hydrocarbons. The loop sealer shall meet the following characteristics provided by Percol Elastic Cement ac Grade:
 
 

APPLICATION    
Component
A
B
Ratio, A:B, volume
1
1
Viscosity at 73 F, cps, ASTM D2393
70
180
Appearance
Brown 
Black
Specific Gravity at 73 (approximate)
1.10
1.03
     
Mixed    
Pot life, seconds, at 73 F (approximate)
60
 
Cure time, minutes, at 73 F (approximate)
10
 
     
Cured    
Specific gravity, ASTM D-792
1.06 to 1.10
 
Hardness, Durometer D, ASTM D-2240
45 to 65
 
Tensile strength, psi, min., ASTM D-412
1600
 
Compression strength, psi, min., ASTM C-39
800
 
Elongation at break (%), min., ASTM D-412
140
 
Tear strength, min., ASTM D-624
150

2.2 Skid Resistant Aggregate
If required, Commercial quality dry blast sand having a gradation between No.4 and No.16 mesh shall be applied to the surface of the repair to provide a skid resistant surface. The sand shall conforming to the dryness requirements in these special provisions at the time of application.

3. EXECUTION
3.1 PREPARATION BEFORE SEALING
Just prior to placing the loop sealer, the saw cut trench and adjacent surface shall be cleaned by compressed air blasting to remove dust and any other loose material.

3.2 PLACEMENT TEMPERATURE
The air temperature shall be between 0 F and 100 F at the time of installation. The resin component temperatures shall be maintained between 50 F and 85 F immediately prior to installation.

3.3 MIXING
The resin shall be mixed in mechanical equipment designed for proper metering and dispensing. Hand mixing shall not be allowed. The mixing equipment shall be approved by the resin manufacturer  . The equipment shall be well-maintained, clean, and operating properly. The mixing equipment shall be properly calibrated and tested prior to installation of repairs. A minimum of one gallon of resin shall be mixed and dispensed prior to beginning work. The pump calibration shall mix the components to within 5 percent.

3.4 INSTALLATION
The mixed loop sealer shall be applied to the trench in a manner to completely fill the trench and encapsulate the detector cable. The trench shall be filled in a manner to avoid entrapment of air.  The filled trench shall be tooled to provide a uniform and well consolidated surface.

Areas to receive an abrasive sand finish shall be broadcast with dry skid resistant aggregate. The sand finish shall be applied immediately after tooling and before gelling occurs. The surface shall be uniform and the sand shall be well adhered. Traffic may be allowed on the repaired area after the resin has cured sufficiently to resist damage or loss of surface-applied aggregate.

3.5 MATERIAL SAFETY
Consult and follow handling and safety directions of the manufacturer and Material Safety Data Sheets. Protective clothing shall include wearing rubber gloves, long sleeve shirts, long pants, proper boots, and safety glasses.

3.6 SUBMITTAL OF PROCEDURES
Submit detailed procedures for the production, transportation, placement, finishing, and curing of the rapid setting urethane loop sealer. In the submittal include handling, storage, and safety procedures to be implemented.

4. BASIS OF PAYMENT
This work will be paid for at the contract unit price per lineal foot for insert (DETECTOR LOOP INSTALLATION) as specified, which price shall be payment in full for furnishing and installing trench and loop sealer.

5. REFERENCES

5.1 REFERENCE ORGANIZATIONS
 
 

AASHTO
American Association of State Highway and Transportation Officials
444 N. Capitol Street NW-Suite 249
Washington, DC 20001
ASTM
American Society for Testing and Materials
1916 Race Street
Philadelphia, PA 19103
 

5.2 REFERENCE STANDARDS
 
 

ASTM C-33
Specification for Concrete Aggregates
ASTM C-39 
Test Method for Compressive Strength of Cylindrical Concrete Specimens
ASTM D-412 
Test Method for Vulcanized Rubber and Thermoplastic Rubbers and 
  Thermoplastic Elastomers-Tension
ASTM D-624
Test Method for Tear Strength of Conventional Vulcanized Rubber
  and Thermoplastic Elastomer
ASTM D-792 
Test Method for Specific Gravity (Relative Density) of Plastics by 
Displacement
ASTM D-2240 
Test Method for Rubber Property-Durometer Hardness
ASTM D-2393
Test Method for Viscosity of Epoxy Resins and Related Components
AASHTO T-84
Specific Gravity and Absorption of Fine Aggregate
AASHTO T-85
Specific Gravity and Absorption of Coarse Aggregate

 

ILLINOIS
DEPARTMENT OF TRANSPORTATION
SPECIFICATION
FA SECTION: COUNTY
1-T-T418#1
DETECTOR LOOP
Effective:

This work shall consist of furnishing and installing a Detector Loop in accordance with the requirements of Section T418 of the Traffic Specifications and revised herein.

Layout of Detector Loop(s)
The Resident Engineer shall mark the location of proposed detector loop(s) on the pavement as indicated on the plan. After all detector loop(s) have been marked on the pavement, the Resident Engineer shall request the Area Traffic Signal Maintenance and Operations Engineer to inspect and approve the detector loop(s) layout. If revisions to detector loop(s) locations are required, the Area Engineer will indicate such revisions to the Engineer at he time of inspection.

Installation of Detector Loop(s)

I. Location
A. Asphalt Pavement
Detector loop which is to be installed in the proposed asphalt pavement must be placed in the pavement below the surface coarse. The location of each dive hole shall be marked on the face of the curb or hand-hole with a saw cut.
B. Existing Asphalt Pavement
Detector loop which is to be installed in an existing asphalt shall be located to miss existing pavement cracks, if possible. The saw cut is to be filled with sealant to one-eighth (1/8") inch below the surface of pavement.
C. Concrete Pavement
Detector loop which is to be installed in concrete payment must be placed to miss pavement joints and cracks, if possible. The saw cut is to be filled with sealant one-eighth 1/8") inch below the surface of pavement.

II. Loop Preparation
All detector loop saw cuts shall be a minimum of one and one-half (1 1/2") inches and a maximum of two (2") inches deep below the surface of the pavement. The corners of all detector loops shall be drilled as well as all pavement cracks that the detector loop crosses. The diameter of the cores shall be two (2") inches and the depth shall be equal to the saw cut. Saw cuts across the corners are NOT allowed. The saw cut shall be a minimum of five-sixteenths (5/16") inches wide and cut in accordance with local land E.P.A. Dust Control requirements. Detector loop(s) shall not be installed in  wet conditions and the saw cuts must be free of debris and residue such as dust and water which is to be achieved by the use of compressed air, wire brushing and heat drying according to sealant manufacture requirements. The detector wire shall be held in place by the use of form wedges of sufficient diameter and strength to hold the wire one (1") inch below the surface of the pavement. Wedges shall be spaced no more than eighteen (18") inches apart.

The number of turns for each detector loop or  series of detector loops shall be determined by the Contractor and approved by the Engineer using the following formulas:

Detector Loop with Four (4) Sides (Single)

L =P/4(N+N)
D
Where L = Loop Inductance (microhenries) [mh]
D
P = Perimeter in (ft)
N Number of turns in loop

Detector Loop with Four (4) Sides (Connected in Series)

 
L =L +L +L
T D2 D2 DN
Where L = Inductance of highest number of loops DN involved
Lead In Cable
Lw = Lead in Length x 0.22 mh/ft

A 2 to 1 ratio of total look inductance to lead-in is ideal. This ratio shall not be less than 1 to 7. All detector loop calculations must be furnished to the Area Signal Engineer at the time that the traffic signal installation is inspected and placed in operation.

The wire from the detector loop to the handhole shall have six twists per foot and have a separate unit duct raceway from the edge of pavement to the handhole. The unit duct shall be one (1') foot into the pavement and loop under the curb and gutter. The unit duct shall be placed at a thirty (30") inch depth.

III. Sealant for Detector Loop(s)
Loop sealer shall be a rapid setting urethane resin. The resin shall have two liquid components mixed in equal volumes. Component A shall consist of aromatic polyisocyanates and petroleum hydrocarbons. Component B shall consists of polyols, catalysts and petroleum hydrocarbons. The loop sealer shall meet or exceed following standards provided by Percol Elastic Cement AC Grade:
 
 

APPLICATION    
Component
A
B
Ratio, A:B, volume
1
1
Viscosity at 73 F, cps, ASTM D2393
70
180
Appearance
Brown 
Black
Specific Gravity at 73 (approximate)
1.10
1.03
     
Mixed    
Pot life, seconds, at 73 F (approximate)
60
 
Cure time, minutes, at 73 F (approximate)
10
 
     
Cured    
Specific gravity, ASTM D-792
1.06 to 1.10
 
Hardness, Durometer D, ASTM D-2240
45 to 65
 
Tensile strength, psi, min., ASTM D-412
1600
 
Compression strength, psi, min., ASTM C-39
800
 
Elongation at break (%), min., ASTM D-412
140
 
Tear strength, min., ASTM D-624
150
 

Just prior to placing the loop sealer, the sawcut trench and adjacent surface shall be cleaned by compressed air blasting to remove dust and any other loose material. The air temperature shall be between 0 F and 100 F at the time of installation. The resin component temperatures shall be maintained between 50 F and 85 F immediately prior to installation. The resin shall be mixed in mechanical equipment designed for proper metering and dispensing. Hand mixing shall not be allowed. The mixing equipment shall be approved by the resin manufacturer. The equipment shall be well-maintained, clean, and operating properly. The mixed loop sealer shall be applied to the trench in a manner to completely fill the trench and encapsulate the detector cable. The filled trench shall be tooled to provide a uniform and well consolidated surface.

IV. Loop Identification

The loop detector wire shall be spliced in the handhole and each lead-in wire shall be labeled in the handhole using a Panduit 250W1175C waterproof tag or approved equal secured to each wire with nylon ties. Each lead-in cable tag shall indicate the location of the loop, loop rotation (clockwise/ counter clockwise), loop lead-in direction (in or out), loop cable number and location in cabinet, and number of turns in the detector loop in waterproof ink as indicated on the District 1 Loop Detail. The Contractor shall mark loop locations on as-built plans and present to the Engineer after final inspection. Basis of Payment. This work will be paid for at the contract unit price per lineal foot for DETECTOR LOOP, which price shall be payment in full for furnishing, installing, and testing the detector loop complete in place. The detector loop shall be measured along the raceway in the pavement rather then the wire itself. Six (6') foot round loop(s) maybe substituted for six (6') foot by six (6') foot square loop(s) and shall be paid for as 24 lineal feet of detector loop. Detector loop lead-ins shall be measured in place from the dive hole to the detector loop.

 

ASPHALT & CONCRETE REPAIR APPLICATIONS (PDF's)

Armored Nosing and Joint Repair Control Joints Deep Spall Repair
Full Depth Crack Repair Header and Joint Replacement Isolation Joint At Retaining Wall
Joint Repair Using Existing Headers Protective Surface Overlay Slip Joint Surface Repair
  Traffic Sensor Loop  

 

IMPORTANT NOTICE:
Recommendations for product use are based on tests believed to be reliable.  Field conditions vary widely.  For this reason, the user must determine product suitability for the particular use and specific method(s) of application.  THE FOLLOWING IS MADE IN LIEU OF ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  Sellers and manufacturers only obligation shall be to replace such quantity of the product proved to be defective.  NEITHER SELLER NOR MANUFACTURER SHALL BE LIABLE FOR LOSS OR DAMAGE, DIRECT, INCIDENTAL OR CONSEQUENTIAL, REGARDLESS OF THE LEGAL THEORY ASSERTED, INCLUDING NEGLIGENCE AND/OR STRICT LIABILITY.  The foregoing may be altered only by an agreement signed by officers of seller and manufacturer.  WARRANTY:  The recommendation for the use of our products are based on tests believed to be reliable.  However, we do not guarantee the results to be obtained by others under different conditions.  NOW WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE IS MADE.  Nothing in this data sheet is intended as a recommendation to use our products so as to infringe on any patent.

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