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“Saving our environment, minimizing traffic disruptions!”



HIR Enviro-Pave Inc. is pleased to offer state-of-the-art, hot-in-place recycling of bituminous concrete pavements.  Our hot-in-place asphalt recycling equipment and process have been field tested in the U.S. and Canada for more than seven years.  HIR Enviro-Pave Inc. now provides this 100% asphalt recycling technology and methodology using the most recent generation of equipment and process enhancements in our contracting service:


100% recycled pavement – no need for an additional riding surface!

One stage recycling – recycled pavement open to traffic within 30 minutes of 
  final compaction!

Maintains one lane for traffic flow at all times – minimum traffic disruption!

No changes to storm drains, manholes or utility gates – reduces hazards and 
  speeds-up project completion time!

Produces an engineered recycled pavement product – increases pavement 
   service life for up to 10 years!

Quality Control of Recycled Asphalt – computer system controls and monitors 
   additives, mixing and grade!

Superior Bonding – hot recycled asphalt placed on hot base!

Seamless Hot Joints – compared to traditional cold joints!

Very Cost Effective – compared to traditional methods!


HIR Enviro-Pave Inc. is a Delaware corporation with offices in Scarborough, Ontario.  


Minimum asphalt pavement thickness of 3"       Minor cracking, rutting and shoving 

8– 12 years old                                               Pavement surface oxidized and polished

No base or sub-base structural failures             Only minor grade correction is required

Our pavement evaluation requires testing of representative core samples, a mix design recommendation based on the testing plus a cost analysis of the project.  Once job specifications are determined, the HIR Enviro-Pave Inc. quality control program monitors adherence to the specifications throughout the recycling process.  We welcome third party testing and engineering reviews to confirm contract compliance.

Please contact us to review hot-in-place asphalt recycling for the restoration of your bituminous concrete pavements.  HIR Enviro-Pave Inc. is honored to have you as a customer.

Before and after using the Enviro-PaverÒ R1015 at a processing depth of 2" 
tructure required no adjustment and is
flush to compacted recycled asphalt.



Enviro-Paver® R1015 

Covered under Patent No. 6,769,836 as well as other Patents applied for.



Saving our environment, minimizing traffic disruptions!



* * *

             We are pleased to showcase photos of the state-of-the-art recycling equipment utilized
             in our 100% Hot-In-Place Recycling process.  Please contact us if you wish to discuss
             the recycling technology in detail or wish to view a project.


“Saving our environment, minimizing traffic disruptions!”



Typical Specifications for Hot-in-Place Recycling Contracts 


Item HIR-250 Hot-In-Place Recycling


250-1             Description


250-1.1             General.  The work under this item shall consist of constructing in-place a recycled bituminous pavement from the existing in-place bituminous pavement and additional materials such as aggregates, rejuvenating agents and/or liquid asphalt cement as required, conforming to the design requirements.  This work shall be accomplished by a series of equipment capable of heating, scarifying, milling and blending the existing in-place bituminous surface to a maximum depth of 2 inches with the added materials and then spreading, reshaping and compacting the blended material to provide a reworked bituminous surface.


250-2                Materials


250-2.1             General.  The hot-in-place recycled pavement shall be composed of a combination of hot-in-place recycled material, new aggregates, rejuvenating agents and/or liquid asphalt cement as required to meet the design requirements all of which shall meet the following:  

250-2.2             Hot-In-Place Recycled Material.  Hot-in-place recycled material shall be material reworked from the existing bituminous pavement during the heating, scarifying, milling and mixing operations.


250-2.3             New Aggregates.  New aggregates if required shall meet the requirements of ASTM D-1073, Standard Specification for Fine Aggregates for Bituminous Paving Mixtures and ASTM D-448 Course Aggregates for Highway Construction.


250-2.4             Rejuvenating Agents.  Rejuvenating agents if required shall be as selected by the contractor during mix design testing to meet the penetration values specified and shall meet the requirements of ASTM D-4552 Hot Mix Recycling Agents.


250-2.5             Asphalt Cement.   Liquid asphalt cement if required shall meet the requirements of ASTM D3381 Viscosity Graded Asphalt Cement for use in Pavement Construction-Table 2.


250-3                Recycled Mix Design and Job Mix Formula


250-3.1             General.  A minimum of five (5) business days prior to the start of hot-in-place recycling the contractor shall submit to the Owner for approval a mix design and job mix formula covering the specific materials to be used on the project. A qualified laboratory shall perform this design. Once materials are approved, no substitution will be permitted unless first tested by the laboratory preparing the mix design and job mix formula and approved by the Owner. No hot-in-place recycling shall take place until the Owner approves the mix design and job mix formula.


250-3.2             Mix Design.  The laboratory shall develop the mix design and present test results for owner approval.  Compatibility of the rejuvenating agent and/or liquid asphalt cement and the existing bituminous material shall be verified by the mix design.


The recycled bituminous mixture shall meet the following Marshall Design Requirements


            Number of Blows-75

            Stability, Pounds- 1500 min.

            Flow, 0.01 in - 8-16

            Air Voids (Percent)- 3-5

            Recovered Recycled Asphalt Cement Penetration (770 F, 100g, 5s) – 60-100


A minimum of one core sample per one thousand (1000) linear feet shall be obtained by the contractor from the existing roadway at the direction of the Owner.  The top two (2) inches shall be cut off from one half of the core samples and tested to determine the following in-situ properties before rejuvenation:


a.                   Gradation and asphalt content of existing pavement.

b.                   Penetration of recovered asphalt cement.

c.                   Percent air voids of existing pavement.

d.                   In-situ bulk relative density.


Based upon the in-situ properties of the existing bituminous pavement the need for additional aggregates will be determined as well as the type and grade of rejuvenating agent and/or liquid asphalt cement to be used.


The laboratory shall then run trial mix designs using the remaining pavement cores and the established blend percentages according to the Marshall Mix Design procedures in order to select the job mix formula (JMF) which meets the design requirements.


250-3.3             Job Mix Formula.  The job mix formula shall be submitted in writing by the contractor at least five (5) business days prior to the start of hot-in-place recycling and shall include as a minimum:


In-situ Properties before Rejuvenation:


a.                   Gradation and asphalt content of existing pavement.

b.                   Penetration of recovered asphalt cement.

c.                   Percent air voids of existing pavement.

d.                   In-situ bulk relative density.


Test Results after Rejuvenation:


a.         Name, manufacturer and supplier of rejuvenating agent and/or liquid asphalt cement to be used.

b.         Amount of rejuvenating agent and/or liquid asphalt cement to be used  in gallons per square yard.

c.         Blending chart and grade of recycling agent selected.

d.         Gradation of new aggregate, expected gradation of combined new aggregate and existing bituminous materials, application rates of new aggregate in pounds per square yard and unit weight on new aggregate in pounds per cubic foot.

e.         All Marshall Mix design calculations and graphs for all trial mixes and the selected JMF.

f.          Summarization of all Marshall characteristics of the recycled mixture at optimum asphalt content.

g.         Recovered penetration of recycled mixture.


250-4                Equipment


250-4.1             General.  The equipment used in the heating and scarifying process shall conform to the following requirements:


Any fine aggregates added to the hot-in-place recycled material shall be added using equipment that is made to add fine aggregate according to the mix design criteria.


All requirements for paving equipment in Standard Specification for Hot Plant Mix Bituminous Pavement.            


250-4.2             Heating Unit (s).  The heating unit (s) shall apply heat in a uniform manner to the surface of the existing pavement to be recycled.  Direct flame shall not contact the bituminous materials at any time during the recycling operations.


The heaters shall be spaced and operated such that sufficient pavement heat penetration is obtained to achieve the desired hot-in-place recycled mix temperatures while causing no damage to the pavement such as that due to overheating or burning of the asphalt binder and aggregates.


The entire heater assembly shall be designed that it may be raised or lowered by hydraulic control. The heater assembly shall be adjustable in width from 10 feet to 15 feet.


Sufficient heating units will be used to produce the required heat to attain the specified depth for the recycling operation.


250-4.3             Recycling Machine.  The recycling machine shall be a self-contained machine specifically designed to reprocess existing bituminous concrete pavements in-place.  Heaters used on the recycling machine itself shall also conform to the requirements specified for heating unit (s).


Scarification Unit- The entire scarification system shall be continuously operating and in contact with the heated surface.  The system must be capable of dislodging bituminous material from around manhole and utility structures without damaging the structures.  The system must be pressure compensated in order to maintain a consistent depth of penetration into the heated surface.

Milling Units. The units shall be rotating milling drums and they shall be adjustable in width from 10 feet to 15 feet.  The milling units shall be capable of uniformly loosening the bituminous concrete pavement to the depth specified and equipped with separate height controls allowing the milling units to clear utilities and other obstructions in the pavement surface. The milling units shall be controlled by independently adjustable, automatic grade controls to maintain correct grade and slope. 


Rejuvenating Agent/Liquid Asphalt Cement Storage Unit.  The storage unit shall be thermostatically controlled to maintain the agent at a constant temperature (if required) as recommended by the agent’s manufacturer.


Spraying Unit.  The spraying unit shall be a system that delivers the rejuvenating agent/liquid asphalt cement uniformly across the processed material and shall incorporate an electronic readout for continuous verification of rejuvenator/liquid asphalt cement quantities.  The amount of agent applied shall vary in direct proportion with the volume of hot-in-place recycled material being processed to maintain a tolerance within +/- 5% of the rate of agent specified.  The spray shall be protected from the wind.


Blending Unit.  The unit shall be a twin shaft, rotary blending system capable of thoroughly mixing the hot-in-place recycled material with rejuvenating agent/liquid asphalt cement and fine aggregates to obtain a homogeneous recycled mix. The blending unit shall be equipped with a moisture extraction system.


Scalping/Storage Unit.  Surplus recycled mix shall be conveyed to and stored in a heated storage bin.  When required the recycled mix shall be reintroduced to the screed in order to maintain a consistent level of recycled mix in front of the screed.


                         Front Asphalt Hot Mix Hopper & Central Conveyor. The Unit shall be fitted with a
asphalt hot mix storage hopper and centrally located conveyor. New asphalt hot mix 
                         (if required) shall be introduced into the blending unit in proportion to the amount of asphalt 
                         being recycled. New asphalt hot mix shall also be supplied to the scalping/storage unit for
                         startup and situations requiring additional asphalt mix.


Screed.  The recycled mix placed by the recycling machine shall be uniformly distributed to the required profile and cross slope by the use of reversible augers and heated vibratory screed.  The screed shall be equipped with an adjustable crown control and each end of the screed shall have thickness adjustment screws for providing the required profile and cross slope.  The screed shall be adjustable in width from 10 feet to 15 feet.


Computer Control and Monitoring System. All additives and processes shall be controlled and monitored by an on-board electronic computer. Membrane panels shall allow additive quantities to be electronically entered and electronic readouts shall provide accurate real time data acquisition.


250-4.4             Compaction Equipment.  Compaction equipment shall meet the requirements of Hot Plant Mix Bituminous Pavement.


250-4.5             Additional Equipment


Cleaning Equipment.  Power brooms, power blowers, air compressors, water flushing equipment and hand brooms shall be suitable for cleaning the existing pavement surface.


Auxiliary Equipment.  Water truck, pneumatic tire roller, hand rakes, shovels and other equipment as necessary shall be provided to perform this work.


250-5                Machine Calibrations


250-5.1             Each unit to be used in performance of the work shall be calibrated immediately prior to construction, or previous calibration documentation covering the exact materials to be used may be acceptable providing they were made during the same calendar year.  The documentation shall include the individual calibration of each material at various settings, which can be related to the machine’s metering devices.


250-6                Weather Limitations


250-6.1             The hot-in-place recycling shall be performed only when the surface and atmospheric temperatures are at least 500 F and rising, the weather is not foggy or rainy and there is no forecast of temperatures below 400 F or rain within 12 hours from the time of placement of the recycled mix.


 250-7               Surface Preparation


250-7.1             General. Manholes, valve boxes and other utility services shall be protected during the hot-in-place operation.


250-7.2             Cleaning of Surface. Immediately prior to the hot-in-place recycling operation, the surface shall be cleaned of all loose material, silt spots, vegetation and other objectionable material.  Any standard cleaning method will be accepted except water flushing will not be permitted.  The use of a power broom or tractor drawn sweeper is recommended for cleaning the pavement surface.


250-8                Construction Details


250-8.1             Hot-In-Place Recycling.  The heating and recycling machines shall heat and recycle the existing bituminous pavement completely across the entire width to a maximum depth of two (2) inches.


Each successive pass shall overlap the previously scarified adjacent surface by a minimum of three (3) inches, with the heaters overlapping an additional minimum of three (3) inches beyond the section that is recycled.

When field-testing indicates that the required depth of heating and scarifying has not been obtained, the process shall be stopped and immediately modified to ensure compliance with the specification.


                        Immediately following the heating and scarifying process the rejuvenating agent and/or liquid 
                        asphalt cement shall be added in the amount specified in the approved job mix formula.


The hot-in-place recycled material and the milling heads shall then mix added materials and blending unit until a homogenous mixture is achieved. The homogenous mixture shall be formed into a slightly compacted windrow to reduce material segregation and heat loss.

The slightly compacted windrow of hot-in-place recycled material shall be distributed evenly across the screed assembly by augers and a windrow divider assembly. Excess windrow material shall be stored in the scalping/storage unit and discharged manually or automatically into the appropriate auger assembly, ensuring a constant head of asphalt in front of the screed assembly.


The hot-in-place recycled mix shall then be struck off evenly with the heated vibratory screed.  The hot-in-place recycled mix shall be at a minimum temperature of 220o F immediately after screeding and prior to initial rolling.  If the temperature of the mix immediately behind the screed falls below 220o F paving shall be stopped and modified to ensure compliance with the specifications.


250-9                Protection of Existing Improvements


250-9.1             Since high temperatures are required in the hot-in-place recycling operation, the contractor shall exercise care against possible injury or damage to existing improvements.  Existing improvements damaged by the contractor shall be repaired or replaced to the satisfaction of the Owner at no cost to the Owner.


250-10              Compaction


250-10.1           Compaction of Mixture.  After placing, the mixture shall be thoroughly and uniformly compacted by rolling.  The surface shall be compacted as soon as possible when the mixture has obtained sufficient stability so that the rolling does not cause undue displacement, cracking or shoving.  The sequence of rolling operations and the type of rollers used shall be at the discretion of the contractor.  A nuclear gauge will be required to monitor pavement density during compaction.


                       The speed of the roller at all times shall be sufficiently slow to avoid displacement of the 
                       recycled mix and be effective in compaction.  Any displacement occurring as a result of
                       reversing the direction of the roller, or from any other cause, shall be corrected at once.

Sufficient rollers shall be furnished to handle the output of the recycling machines.  Rolling shall continue until the surface is of uniform texture, true to grade and cross section, and the required density is obtained.

To prevent adhesion of the mixture to the roller, the wheels shall be kept properly moistened (and scrapers used), but excessive water will not be permitted.


In areas not accessible to the roller, the mixture shall be thoroughly compacted with hand tampers.


Any recycled mix that becomes loose or broken, mixed with dirt, contains checking, cracking or in any way defective shall be removed and replaced with fresh recycled mix and immediately compacted to conform to the surrounding area.


250-11              Contractor Quality Control


250-11.1           General.  The contractor shall develop a Quality Control Plan and submit to the Owner for approval not less than five (5) business days before any hot-in-place recycling work starts.  The plan shall address the elements which effect the quality of the hot-in-place recycling including:


a.                    Recycled Mix Design

b.                    Recycled Mix Depth

c.                    Aggregate Yield

d.                    Recovered Penetration of Recycled Asphalt Cement

e.                    Recycled Mix Temperature

f.                     In-Place Density determined by Nuclear Gage


250-11.2           Quality Control Testing.  The contractor shall perform all quality control tests necessary to control the hot-in-place recycling in accordance with the specification and as set forth in the Quality Control Plan.  The testing program shall include but not limited to, test for control of mix design, depth, yield, temperature and field compaction. A quality control testing plan shall be developed as part of the Quality Control Plan.


a.         Recycled Mix Design – A minimum of two (2) random samples shall be taken from the screed auger chamber each work day and tested for mix design verification.


b.          Recycled Mix Depth – A minimum of four (4) tests will be required for the first 2000 square yards after each start up of the hot-in-place recycling equipment.  A minimum of two (2) tests shall be done for each 5000 square yards or portion of thereafter.


c.         Aggregate Yield – A minimum of two (2) tests will be required for each 10,000 square yards.


d.         Recovered Penetration – One (1) test will be required for each 10,000 square yards.


e.         Air Voids – One (1) test will be required for each 10,000 square yards.


f.          Mix Temperature – Temperatures shall be checked at least four (4) times for each 10,000 square yards.


g.         In-Place Density Monitoring – The contractor shall conduct all necessary testing to ensure that the specified density is being achieved.  A nuclear gauge will be required to monitor the pavement density in accordance with ASTM D 2950.


h.         Additional Testing – Any additional testing the contractor deems necessary to control the process may be performed at the contractor’s option and expense.


250-12             Material Acceptance


250-12.1          Non-Compliance – if any two (2) successive tests fail, the hot-in-place recycling shall 
                       be stopped.  It is the responsibility of the contractor, at his own expense, to correct the
                       problems.  The contractor must submit to the Owner for approval his proposed method
                       to correct the problem before any additional work can be performed.


250-13             Method of Measurement And Basis Of Payment


250-13.1          The hot-in-place recycling shall be measured and paid for by the number of square yards
                       completed and accepted, as determined by the Owner, at the unit price bid for Item HIR-250,
                       Hot-In-Place Recycling.  The unit bid per square yard for this item shall include all labor,
                       materials, tools, equipment and all incidentals necessary to satisfactorily complete the required
                       work, including heating, scarifying and milling the existing surface, supplying and applying the
                       recycling agent and any additional aggregate required, screeding and compacting the recycled
                       material, any mix designs, quality control testing, and material acceptance testing, the
                       preparation and cleaning of the existing surface, all laboratory tests and reports.                       

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Asphalt Pavement Recycling Machinery Specification Sheet

Please complete this specification sheet with your application requirements and e-mail it to us.  We reserve the right to present detailed quotations only to pre-qualified companies.

Company Name:
Contact Name:
City, State/Province:
Zip/Postal Code:
Phone Number:
Fax Number:
Please tell us about your operational requirements and the operation of your company:
1.  Are you presently a paving contractor bidding for repaving jobs? 
      If no what business are you in? 
     a)  Consulting                               

     b)  General Road Building              
     c)  Aggregate business                  
     d)  Asphalt producer                      
     e)  Do you own an Asphalt Plant?   
     f)   Public or private Agency/Corp. 
          interested in letting contracts for
          HIR.  If yes, please list project
          location and approx. square
          yardage being considered at end
          under additional data/remarks.


2.  What is the size of your operation?  Approx. how many tons of Asphalt do you use per

3.  Are you familiar with Hot-In-Place Asphalt recycling? 

4.  Are you aware that Hot-In-Place recycling machinery including Preheaters requires a large front 
     end investment but the process is approx. 50% more cost efficient? 

5.  If your company is prepared to seriously consider purchase of the equipment, do you have 
     internal or external financing available. 

6.  What is the approx. number of months if you are considering purchase that you would require 
     the equipment?  months.






1.      Print out form for your own records.

2.      To transmit e-mail click “Submit”