Recommended Specifications
For
Hot Surface Treatments




INTRODUCTION


Hot surface treatments are the most cost efficient means of maintaining asphalt pavements. With the new technology in heating systems today, the door has been opened to all pavement managers, rural, urban and private, to take advantage of the savings..

Hot surface treatments save maintenance dollars and conserve resources by making optimum use of materials already in place often without any additional materials.

To take advantage of the benefits of hot surface treatments, a pavement manager needs only to first select the appropriate treatment for the specific pavement, draw up the specifications, and advertise for bids.

The following pre-bid Consideration and Recommendation Bid specifications are designed to assist engineers that are unfamiliar with the process or agencies that wish to improve existing specifications. They have been proven to be the most practical and cost efficient methods available.

These specifications should be considered as a guideline for the minimum acceptable performance. Agencies that follow these specifications and monitor the process for strict compliances will receive the full benefits of hot surface treatments.


CONSIDERATION BEFORE BIDDING

1. Many asphalt pavement projects are appropriate for the various hot surface treatments. Suitable pavements that have good stability and an adequate base, but often exhibit cracks, deterioration, and other surface characteristics not conductive to good riding qualities or appearance.
2. In some hot surface treatments, pavements that have received prior treatments with special seal coatings, slurries, chip seals, painted lines or other foreign material on the surface which might interfere with the recycling process, may require removal of these contaminates prior to any hot surface treatment.

SELECTING THE PROPER HEATING MACHINE

This is one of the most important decisions of any hot surface project. Many agencies in the past have had considerable problems with the open flame type heating machine. The only way to eliminate the risk is to specify a heating chamber that is
100% radiant, (no flame) and that has the capabilities to spread the heat under the chamber so that every square foot produces the same amount of BTU’s and can be adjustable from 40,000 to 100,000 BTU’s for the various conditions of the asphalt being heated and the conditions of the environment.

AIR QUALITY PROVISIONS

Hot surface treatment projects made with 100% radiant,(no flame) heating units have conformed to the most stringent local and regional air quality standards. These standards may vary, but a typical standard is as follows:

1. Visible emissions of more than 20% opacity should not be discharged into the atmosphere for a period or periods totaling more than two minutes in any one hour. For this purpose of this rule, visual emissions are to be viewed by an observer from the ground up.
2. All units of equipment should be fired with liquid propane gas or liquid natural gas.

HOT SURFACE TREATEMENTS

HOT MILLING

Although hot milling has been used in many countries and has proven to provide the highest production rate at a more competitive price in normal weather conditions, the savings are even greater in colder or climates of high moisture and also leaves a better surface finish with less loosened and broken aggregates.

PURPOSE FOR HOT MILLING

Correction skid problems through material removal.

Maintaining good cross slope for drainage.

Removal of surface irregularities, corrugations, rutting.

Removal of material for central plant recycling.

The most important are where excessive asphalt material was placed throughout the years not for additional structural capacity but simply a cosmetic improvement of the top surface affecting the drainage capabilities and the curb height. This material should be considered to be a reserve and very valuable if removed using heat one inch at a time, in place of cold milling which fractures the stone and reduces a good mix to fine, mostly uncoated, broken stones. This surface can be removed back to the proper grade. More of this milled asphalt can be run through a central plant requiring less new asphalt for another street and the milled surface left on this street can be hot surface rolled to a smooth finish or hot-in-place recycled and prepared for a new asphalt lift, chip coat or slurry seal.

HOT SURFACE ROLLING

Hot rolling is something new in the industry. It has been used most often for surfaces that have been milled for various reasons. Hot surface rolling takes place after the pavement surface has been preheated and softened so that a roller can level off the grooves making a tight, smooth surface once again without the addition of any new asphalt.

Hot rolling is being used where skid resistance is a problem. The surface is preheated, a layer of skid resistant chips is spread in front of the heating unit, a steel wheel roller follows the heating unit to seat the chips into the softened surface layer.


RECOMMENDED BID SPECIFICATIONS

FOR HOT SURFACE MILLING

SCOPE

The work covered by this section of the specifications consists of furnishing all labor, equipment, and materials, and performing all operations in connection with heating of the surface to be milled.

CLEANING

Prior to commencing surface heating operations, the pavement shall be cleaned of all loose material. Power brooms shall be supplemented, when necessary, by hand brooming and such other tools as required to bring the surface to a clean, suitable condition, free of deleterious material.

EQUIPMENT

The equipment used to heat the asphalt surface shall fully meet the standards of the state and local bureau of Air Pollution Control.

The heating system shall be
100% radiant, (no flame), and have the capabilities to evenly adjust the output from 40,00 to 100,000 BTU’s in each square foot of chamber surface to allow the machine to be pre-adjusted for the various type and environmental conditions according to the thickness of the asphalt to be milled. The heating system must also be capable to turn instantly “ON or OFF” and to heat in widths ranging from 2 feet to 13 feet depending on the width that is being milled.

The heating equipment must stay far enough ahead of the milling machine so that the heat can penetrate and the top surface can re-cool to prevent the asphalt being milled from sticking in the truck.

The milling equipment shall be in accordance with the standard practices for such operation.


FOR HOT SURFACE LEVELING

SCOPE

The work covered by this section of the specifications consists of furnishing all labor, equipment, and materials, and performing all operations in connection with heating, leveling, and compacting.

CLEANING

Prior to commencing hot surface leveling operations, the pavement shall be cleaned of all loose material. Power brooms shall be supplemented, when necessary, by hand brooming and such other tools, as required, to bring the surface to a clean, suitable condition, free of deleterious material. Any required patching work shall be completed prior to beginning the process.

EQUIPMENT

The equipment used to heat the asphalt surface shall fully meet the standards fo the state and local bureau of Air Pollution Control.

The heating system shall be
100% radiant, (no flame), and have the capabilities to evenly adjust the output from 40,00 to 100,000 BTU’s in each square foot of chamber surface to allow the machine to be pre-adjusted for the various type and environmental conditions and the depth of the grooves in the pavement to be heated.

The heating system must also be capable to turn instantly “ON or OFF” and to heat in widths ranging from 2 feet to 13 feet depending on the width that is being leveled.

Immediately following the heating unit, the pavement shall be rolled with a vibratory roller.

At this time, a rejuvenating agent or a combination rejuvenating and emulsion or slurry seal, chip coat, or new asphalt surface can be applied in accordance to standard specifications in the industry for the particular application.

The leveling equipment shall be in accordance with the standard practices for such operation.


FOR HOT SURFACE SKID CONTROL

SCOPE


The work covered by this section of the specifications consists of furnishing all labor, equipment, and materials, and performing all operations in connection with heating application.

CLEANING

Prior to the skid proofing operation, the pavement shall be cleaned of all loose material. Power brooms shall be supplemented, when necessary, by hand brooming and such other tools, as required, to bring the surface to a clean, suitable condition, free of deleterious material. Any required patching work shall be completed prior to beginning the process.

EQUIPMENT

Following the cleaning, a fine layer of skid resistant chips shall be spread over the slick pavement with an approved chip spreader. The amount of material to be determined by the Engineer and paid for by the ton. Then the surface is to be heated.

The equipment used to heat the asphalt shall fully meet the standards of the state and local bureau of Air Pollution Control.

The heating system shall be
100% radiant, (no flame), and have the capabilities to evenly adjust the output from 40,00 to 100,000 BTU’s in each square foot of chamber surface to allow the machine to be pre-adjusted for the various type and environmental conditions to properly seat the skid resistant chips.

Following the heating, the surface shall be rolled with a vibratory roller.

SUMMARY

Thermal Power Corporation is dedicated to manufacturing the finest Road Saving equipment in the world.

The primary purpose of these specifications is to develop a clean, clear, quiet, high quality hot surface treatment reputation and to raise the standards of such treatments so that every pavement manager, rural, urban or private, can take advantage of the savings.

We at TPC set the best specifications possible and then build the machinery to perform these specifications.

Thermal Power Corporation is constantly striving to improve its products and methods. Therefore, we reserve the right to change design, materials, and/or specifications without notice.


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