Cutback Bitumen RC-3000
Cutback Bitumen RC-3000 Description
Our Cutback Bitumen RC-3000 complies with cutback petroleum asphalts of the rapid-curing type for use in the construction and treatment of pavements as per ASTM D2028-97 reapproved in 2004. Cutback Grade Bitumen is normally used in spraying and in some mixing applications. Cutback Bitumen is penetration grade bitumen blended with a solvent such as kerosene, white spirit, gasoline, and naphtha, controlling the curing time. Cut back petroleum asphalts of the rapid curing type supplied by us is petroleum grade bitumen manufactured from the fractional / vacuum distillation HJ Oil Group of crude oil blended with a solvent. Bitumen supplied by us is produced from the vacuum residue (short residue) feedstock. Penetration Grade bitumens are specified by the penetration and softening point test. The designation is by penetration range only. The penetration grade bitumens have a thermoplastic property which causes the material to soften at high temperatures and to harden at lower temperatures. This unique temperature/ viscosity relationship is important when determining the performance parameters such as the adhesion, rheology, durability, and application temperatures of bitumen. The cutback bitumen (Asphalts) supplied by us are blended from petroleum grade bitumen as stated herein.
Cutback asphalt is an asphalt cement that has a solvent or distillate such as gasoline, diesel fuel, kerosene, or naphtha added to make the asphalt liquid at ambient temperatures and improve its ability to coat aggregates. Two letters followed by a numerical digit designate or name a cutback asphalt.
Cutback asphalt can contain between 12 and 40 percent distillate. The high demand for the distillates to be used in energy applications and ever-increasing air quality regulations have caused a steady decline in the use of cutback asphalt.
When gasoline or naphtha is used to flux asphalt cement, the final product is called “rapid curing” (RC) cutback asphalt. Specifications permit up to 45 percent distillate in manufacturing an RC-3000 cutback asphalt.
Cutback Asphalt RC-3000 Applications
Current common uses are in penetrating prime coats and in producing patching or stockpile mixtures. Cutback asphalt used in mixing with aggregate will usually contain an adhesion agent to assist in the coating of the aggregate surface.
Cutback agents are used to lowering the viscosity of bitumen when it is applied as a primer to the surface of a road pavement aggregate base course or substrate. Kerosene is used as a bitumen cutback agent at different concentrations according to local conditions and requirements.
The cutback bitumen is ideal for prime coat and cold applied because of easy uses and no need for thinning and heating.
Cutback bitumen RC-3000 consist of initial incorporation of asphalt into the surface of non-asphalt based course preparatory to any superimposed treatment of construction.
The cutback asphalt RC-3000 applying to waterproof of surfaces, plug capillary voids, coat, and bond loose mineral particles.
Packing of Cutback Bitumen RC3000
Packing of cutback bitumen RC-3000 is in the new thick steel drum on the pallet to prevent any leak inside of container also bulk in bitutainer and tanker.
Safety of Cutback Asphalt RC-3000
Refer to Safety Datasheets before use.
Transport, use, and store at the lowest temperature possible.
Eliminate all potential ignition sources during application.
Avoid breathing vapors. Avoid contact with skin.
Always wear appropriate PPE including heat protection when used hot.
DO NOT allow product or washings to enter stormwater or sewer systems.
Specification of Cutback Asphalt RC 3000
we guarantee that the Rapid curing CutBack Grade RC-3000 it supplies under its offers is produced in compliance to and is in conformity to ASTM D-2028-97 Rev 2004 and is compliant to the following specification requirements.
Properties | Specification limit | Specification limit | Test method |
Min | Max | ||
Kinematic viscosity at 60°c ,cST | 3000 | 6000 | ASTM D2170 |
Flashpoint(tag open cup), °c | — | 27 | ASTM D3143 |
Distillation test Distillate, volume percent of total Distillate to 680°F(360°F) | |||
to 437°f(225°c) | — | — | ASTM D402 |
To 500°f(260°c) | 25 | — | |
to 600°f(316°c) | 70 | — | |
Residue from distillation to 680°f(360°c), percent volume by the difference | 80 | — | |
Test on Residue from distillation test | |||
Penetration 77°f(25°c) 100g,5s mm | 80 | 120 | ASTM D5 |
Ductility 77°f(25°c) 5cm/min cm | 100 | — | ASTM D113 |
Solubility in trichloroethylene % | 99 | — | ASTM D2042 |
Water, percent volume | — | 0.2 | ASTM D95 |
Cutback Bitumen RC-800
Cutback Bitumen RC-800 Description
Cutback Bitumen RC-800 is Rapid curing (RC) cut-back asphalt consisting of penetration grade asphalt cement and diluent or cutter of rapid volatility.
Our Cutback Bitumen RC-800 complies with cutback petroleum asphalts of the rapid-curing type for use in the construction and treatment of pavements.
Cutback bitumen RC800 is dissolved of bitumen in solvents of Naphtha. Petroleum solvents such as naphtha, kerosene, etc. are cutback agents which can reduce the viscosity of the bitumen. As well as improving the ability to coat aggregates.
Cutback Bitumen RC-800 is a rapid curing cutback bitumen that contains 75% bitumen, is black in color, and is manufactured strictly as per ASTM D 2028M standard. The diluent temporarily reduces the viscosity of the asphalt cement for ease of handling and application. After application, the diluent evaporates, leaving asphalt cement to perform its function. RC–800 bitumen viscosity is between 800-1600 CST.
Cutback Bitumen RC-800 is dissolved of bitumen in solvents of gasoline. In many countries, kerosene and other volatile petroleum-derived products are added as a cutter or cutback agent to bitumen to reduce (or cutback) the viscosity of the bitumen. The mixture obtained may be called cutback bitumen.
gasoline or naphtha is used as the solvent in order to manufacture rapid curing bitumen cutback. RC-800 is one of the examples of a rapid curing cutback bitumen. The typical amount of solvent or distillate in a cutback bitumen is from 12% to 40%. Naphtha is used as a bitumen cutback agent at different concentrations according to local conditions and requirements.
The reduction in viscosity of the bitumen aids the construction of seal coats in road pavements as the softened mixture wets the chips more easily. The cutback agent evaporates from the seal coat, the cutback agent becoming a negligible component of the seal coat a few months after application. If significant amounts of the cutback agent remain in the seal coat an unwanted long term softening effect may result. Also, Cutback asphalt is an asphalt cement that has a solvent or distillate such as gasoline, diesel fuel, kerosene, or naphtha added to make the asphalt liquid at ambient temperatures and improve its ability to coat aggregates.
Cut back bitumen are easy to use because it is cold applied. Cut back grade bitumen is normally used in spraying. The main applications of RC-800 are in road pavement, tack coat, and prime coat.
CutBack Bitumen RC-800 Applications
Cutback agents are used to lowering the viscosity of bitumen when it is applied as a primer to the surface of a road pavement aggregate base course or substrate. Kerosene is used as a bitumen cutback agent at different concentrations according to local conditions and requirements.
The cutback bitumen is ideal for prime coat and cold applied because of easy uses and no need for thinning and heating.
Cutback bitumen RC-800 consists of initial incorporation of asphalt into the surface of non-asphalt based course preparatory to any superimposed treatment of construction.
The cutback asphalt RC800 applying to waterproof of surfaces plug capillary voids, coat, and bond loose mineral particles.
Also, It uses in Priming of all non-bituminous road buses, provision of temporary surfaces(deviations).
This kind of bitumen is suitable to be used in the construction and treatment of pavements as per ASTM D2028-97 reapproved in 2004. Cutback Grade Bitumen is normally used in spraying and in some mixing applications. Current common uses are in penetrating prime coats and in producing patching or stockpile mixtures. Cutback asphalt used in mixing with aggregate will usually contain an adhesion agent to assist in the coating of the aggregate surface. RC800 is used for pavement base and surfaces with dense-graded aggregate also for patching.
Guaranty and Safety of Bitumen RC-800
we guaranty the quality of cutback Asphalt RC800 with the arrangement of the international inspector. By checking the quality and quantity of the bitumen on each shipment during the loading to the vessel. Also controlling the production by the QC team via batch test report before shipping.
Here are the properties of Bitumen cutback RC800 which is classified by ASTM/EN15322:2009.
Bitumen RC800 Packing
Packing of cutback bitumen RC800 is in a new thick steel drum on the pallet to prevent any leak inside of the container, IBC Tank, and also bulk in bitutainer.
Specification of Cutback Asphalt RC800
property | Specification Limit | Specification Limit | Test method |
Min | Max | ||
Kinematic viscosity at 60°c, mm2/s | 800 | 1600 | ASTM D2170 |
Flashpoint(tag open cup), °c | +27 | — | ASTM D3143 |
Distillation test Distillate, volume percent of total Distillate to 680°f(360°c) | |||
to 437°f(225°c) | 15 | — | ASTM D402 |
To 500°f(260°c) | 45 | — | |
to 600°f(316°c) | 75 | — | |
Residue from distillation to 680°f(360°c), percent volume by difference | 75 | — | |
Test on Residue from distillation test | |||
Penetration 77°f(25°c) 100g,5s mm | 80 | 120 | ASTM D5 |
Ductility 77°f(25°c) 5cm/min cm | 100 | — | ASTM D113 |
Solubility in trichloroethylene % | 99 | — | ASTM D2042 |
Water, percent volume | — | 0.2 | ASTM D95 |
Cutback Bitumen RC-250
Cutback Bitumen RC-250 Description
Cutback Bitumen RC-250 complies with cutback petroleum asphalts of the rapid-curing type for use in the construction and treatment of pavements as per ASTM D2028-97 reapproved in 2004. Cutback Grade Bitumen is normally used in spraying and in some mixing applications. Cutback Bitumen is penetration grade bitumen blended with a solvent such as kerosene, white spirit, gasoline, and naphtha, controlling the curing time. Cut back petroleum asphalts of the rapid curing type supplied by are petroleum grade bitumen manufactured from the fractional / vacuum distillation of crude oil blended with a solvent. Bitumen supplied by HJ Oil is produced from the vacuum residue (short residue) feedstock. Penetration Grade bitumens are specified by the penetration and softening point test. The designation is by penetration range only. The penetration grade bitumens have a thermoplastic property which causes the material to soften at high temperatures and to harden at lower temperatures. This unique temperature/ viscosity relationship is important when determining the performance parameters such as the adhesion, rheology, durability, and application temperatures of bitumen. The cutback bitumen (Asphalts) supplied by us are blended from petroleum grade bitumen as stated herein.
Cutback asphalt is an asphalt cement that has a solvent or distillate such as gasoline, diesel fuel, kerosene, or naphtha added to make the asphalt liquid at ambient temperatures and improve its ability to coat aggregates. Two letters followed by a numerical digit designate or name a cutback asphalt.
Cutback asphalt can contain between 12 and 40 percent distillate. The high demand for the distillates to be used in energy applications and ever-increasing air quality regulations have caused a steady decline in the use of cutback asphalt.
When gasoline or naphtha is used to flux asphalt cement, the final product is called “rapid curing” (RC) cutback asphalt. Specifications permit up to 45 percent distillate in manufacturing an RC-250 cutback asphalt.
Cutback Bitumen RC-250 Applications
Current common uses are in penetrating prime coats and in producing patching or stockpile mixtures. Cutback asphalt used in mixing with aggregate will usually contain an adhesion agent to assist in the coating of the aggregate surface.
Cutback Asphalt RC-250 Packing
This cutback bitumen bulk in the tanker and also in new steel and thick drum on the pallet to prevent all leak inside of the container.
Safety of cutback bitumen RC-250
Refer to Safety Datasheets before use.
Transport, use, and store at the lowest temperature possible.
Eliminate all potential ignition sources during application.
Avoid breathing vapors. Avoid contact with skin.
Always wear appropriate PPE including heat protection when used hot.
DO NOT allow product or washings to enter stormwater or sewer systems.
RC-250 Specifications
HJ Oil Group guarantees that the Rapid curing CutBack Grade RC-250 it supplies under its offers is produced in compliance to and is in conformity to ASTM D-2028–97 Rev 2004 and is compliant to the following specification requirements.
property | specification limit | specification limit | Test method |
Min | Max | ||
Kinematic viscosity at 60°c ,cST | 250 | 500 | ASTM D2170 |
Flashpoint(tag open cup), °c | — | 27 | ASTM D3143 |
Distillation test Distillate, volume percent of total Distillate to 680°f (360°c) | |||
to 437°f(225°c) | 35 | — | ASTM D402 |
To 500°f(260°c) | 60 | — | |
to 600°f(316°c) | 80 | — | |
Residue from distillation to 680°f(360°c), percent volume by the difference | 65 | — | |
Test on Residue from distillation test | |||
Penetration 77°f(25°c) 100g,5s mm | 80 | 120 | ASTM D5 |
Ductility 77°f(25°c) 5cm/min cm | 100 | — | ASTM D113 |
Solubility in trichloroethylene % | 99 | — | ASTM D2042 |
Water, percent volume | — | 0.2 | ASTM D95 |
Cutback Bitumen RC-70
Description of Cutback Bitumen RC-70
Cutback Bitumen RC-70 is Rapid curing (RC) cut-back asphalt consisting of penetration grade asphalt cement and diluent or cutter of rapid volatility.
Our Cutback Bitumen RC-70 complies with cutback petroleum asphalts of the rapid-curing type for use in the construction and treatment of pavements.
Cutback Bitumen RC-70 is a rapid curing cutback bitumen that contains 55% bitumen, is black in color, and is manufactured strictly as per ASTM D-2028M standard.
Cutback Bitumen RC-70 is dissolved of bitumen in solvents of gasoline. In many countries, kerosene and other volatile petroleum-derived products are added as a cutter or cutback agent to bitumen to reduce (or cutback) the viscosity of the bitumen. The mixture obtained may be called cutback bitumen.
The reduction in viscosity of the bitumen aids the construction of seal coats in road pavements as the softened mixture wets the chips more easily. The cutback agent evaporates from the seal coat, the cutback agent becoming a negligible component of the seal coat a few months after application. If significant amounts of the cutback agent remain in the seal coat an unwanted long term softening effect may result.
CutBack Bitumen RC-70 Uses
This kind of bitumen is suitable to be used in the construction and treatment of pavements as per ASTM D2028-97 reapproved in 2004. Cutback Grade Bitumen is normally used in spraying and in some mixing applications. Current common uses are in penetrating prime coats and in producing patching or stockpile mixtures. Cutback asphalt used in mixing with aggregate will usually contain an adhesion agent to assist in the coating of the aggregate surface.
Cutback agents are used to lowering the viscosity of bitumen when it is applied as a primer to the surface of a road pavement aggregate base course or substrate. Kerosene is used as a bitumen cutback agent at different concentrations according to local conditions and requirements.
The cutback bitumen is ideal for prime coat and cold applied because of easy uses and no need to thinning and heating.
Cutback bitumen RC-70 consists of initial incorporation of asphalt into the surface of non-asphalt based course preparatory to any superimposed treatment of construction.
The cutback asphalt RC-70 applying to waterproof of surfaces plug capillary voids, coat, and bond loose mineral particles.
This kind of bitumen is suitable to be used in the construction and treatment of pavements as per ASTM D2028-97 reapproved in 2004. Cutback Grade Bitumen is normally used in spraying and in some mixing applications.
Bitumen-Aggregate mixtures
Mixed-in-place (road mix):
- Pavement base and surfaces with sandy soi
Bitumen RC70 is ideal for surface treatment as:
- Prime coat on open surfaces
- Prime coat on tight surfaces
- Tack coat
- Dust binder
- Mulch treatment
Guaranty and Safety of Bitumen RC-70
We guaranty the quality of cutback Bitumen RC-70 with the arrangement of the international inspector. By checking the quality and quantity of the bitumen on each shipment during the loading to the vessel. Also controlling the production by QC team via batch test report before shipping.
Packing of Bitumen RC70
Packing of cutback bitumen RC-250 is in a new thick steel drum on the pallet to prevent any leak inside of the container, IBC Tank, and also bulk in vacutainer.
Specification of Cutback Asphalt RC70
property | Specification Limit | Test method | |
Min | Max | ||
Kinematic viscosity at 60°c , mm2/s | 250 | 500 | ASTM D2170 |
Flashpoint(tag open cup), °c | — | — | ASTM D3143 |
Distillation test Distillate, volume percent of total Distillate to 680°f(360°c) | |||
to 437°f(225°c) To 500°f(260°c) to 600°f(316°c) Residue from distillation to 680°f(360°c), percent volume by difference | 50 | — | ASTM D402 |
70 | — | ||
85 | — | ||
55 | — | ||
Test on Residue from distillation test | |||
Penetration 77°f(25°c) 100g,5s mm | 80 | 120 | ASTM D5 |
Ductility 77°f(25°c) 5cm/min cm | 100 | — | ASTM D113 |
Solubility in trichloroethylene % | 99 | — | ASTM D2042 |
Water, percent volume | — | 0.2 | ASTM D95 |
Cutback Bitumen RC-30
Cutback Bitumen RC-30 Description
Cutback bitumen RC-30 is an asphalt cement that has a solvent or distillate such as gasoline, diesel fuel, kerosene, or naphtha added to make the asphalt liquid at ambient temperatures and improve its ability to coat aggregates. Two letters followed by a numerical digit designate or name a cutback asphalt.
Cutback asphalt can contain between 12 and 40 percent distillate. The high demand for the distillates to be used in energy applications and ever-increasing air quality regulations have caused a steady decline in the use of cutback asphalt.
When gasoline or naphtha is used to flux asphalt cement, the final product is called “rapid curing” (RC)cutback asphalt. Specifications permit up to 45 percent distillate in manufacturing an RC-30 cutback asphalt.
Our Cutback Bitumen RC-30 complies with cutback petroleum asphalts of the rapid-curing type for use in the construction and treatment of pavements as per ASTM D2028-97 reapproved in 2004. Cutback Grade Bitumen is normally used in spraying and in some mixing applications. Cutback Bitumen is penetration grade bitumen blended with a solvent such as kerosene, white spirit, gasoline, and naphtha, controlling the curing time. Cut back petroleum asphalts of the rapid curing type supplied by us are petroleum grade bitumen manufactured from the fractional / vacuum distillation of crude oil blended with a solvent. Bitumen supplied by us is produced from the vacuum residue (short residue) feedstock. Penetration Grade bitumens are specified by the penetration and softening point test. Designation is by penetration range only. The penetration grade bitumens have a thermoplastic property which causes the material to soften at high temperatures and to harden at lower temperatures. This unique temperature/ viscosity relationship is important when determining the performance parameters such as the adhesion, rheology, durability, and application temperatures of bitumen. The cutback bitumen (Asphalts) supplied by HJ Oil Group are blended from petroleum grade bitumen as stated herein.
Cutback Bitumen RC-30 Applications
Current common uses are in penetrating prime coats and in producing patching or stockpile mixtures. Cutback asphalt used in mixing with aggregate will usually contain an adhesion agent to assist in the coating of the aggregate surface.
RC-30 Packing
This cutback bitumen bulk in the tanker and also in new steel and thick drum on the pallet to prevent all leak inside of the container.
RC-30 Safety
Refer to Safety Data sheets before use.
Transport, use and store at the lowest temperature possible.
Eliminate all potential ignition sources during application.
Avoid breathing vapors. Avoid contact with skin.
Always wear appropriate PPE including heat protection when used hot.
DO NOT allow product or washings to enter stormwater or sewer systems.
Cutback Bitumen RC-30 Characteristics
HJ Oil Group guarantees that the Rapid curing CutBack Grade RC-30 it supplies under its offers is produced in compliance to and is in conformity to ASTM D-2028-97 Rev 2004 and is compliant to the following specification requirements.
property | specification limit | Test method | |
Min | Max | ||
Kinematic viscosity at 60°c ,cST | 30 | 60 | ASTM D2170 |
Flashpoint(tag open cup), °c | — | — | ASTM D3143 |
Distillation test Distillate, volume percent of total Distillate to 680°f(360°c) | |||
to 437°f(225°c) To 500°f(260°c) to 600°f(316°c) Residue from distillation to 680°f(360°c), percent volume by difference | 55 75 90 50 | — | ASTM D402 |
Test on Residue from distillation test | |||
Penetration 77°f(25°c) 100g,5s mm | 80 | 120 | ASTM D5 |
Ductility 77°f(25°c) 5cm/min cm | 100 | — | ASTM D113 |
Solubility in trichloroethylene % | 99 | — | ASTM D2042 |
Water, percent volume | — | 0.2 | ASTM D95 |
Rapid Curing Cutback Bitumen
Rapid Curing Cutback Bitumen Description
Rapid curing cutback Bitumen cement is a combination of light diluents of high volatility, generally in the gasoline or naphtha boiling point range (RC-70, 250, 800, 3000), and asphalt cement.
Cut-back asphalts is defined as the bitumen whose viscosity value will be greatly reduced by the addition of volatile diluents (high viscosity). It mainly depends upon the diluents used. Generally, three types of cutbacks are used as follows, 1) rapid curing, 2) medium curing and 3) slow curing.
Rapid curing cutback asphalt combinations are prepared starting from the lighter diluents, and even from the fluid of higher viscosity. The grades used for rapid curing cutback bitumen are RC-70, RC-250, RC-800 and RC-3000. Here, the value given by numbers 70, 250, 800, and 3,000 represents the kinematic viscosity of the bitumen given in centistokes. The solvent concentration of rapid curing asphalt is 15-45% of the volume of asphalt cement used.
Different degrees of fluidity exists for each case and it depends on the proportion of the solvent of asphalt cement. In a minor degree cutback, liquidity may get affected by the hardness of base asphalt from which the cutback is made. It is used for the prime coats.
It is used in the pavement design process. It reacts quickly for the spray applications of bond and tack coats. It is helpful to seal the aggregate chips and sand seals. Rapid curing asphalts are mainly used for surface treatment.
Cut back asphalt RC 800 is useful for waterproofing surfaces and plug capillary voids. Grade RC250 acts as a seal coat in roadway pavements.
Mainly two tests are conducted on cut-back asphalt and are given as 1) residue and 2) cut back test. The testing of residue focusses on examination of penetration, ductility, and solubility. The testing of cutback bitumen includes the distillation, viscosity and flash point tests.
The degree of liquidity developed in each case depends principally on the proportion of solvent to asphalt cement. To a minor degree, the liquidity of the cutback may be affected by the hardness of the base asphalt from which the cutback is made. The degree of fluidity results in several grades of cutback asphalt—some quite fluid at ordinary temperatures and others somewhat more viscous. The more viscous grades may require a small amount of heating to make them fluid enough for construction operations.
Cutback Bitumen Rapid Curing Applications
Rapid Curing Cutback Bitumen is made by reducing the viscosity of and ordinary bitumen by adding mostly petroleum type solvent. Cutback Bitumen are used because their viscosity is lower than that of neat asphalt and can thus be used in low-temperature applications.
The rapid-setting grades are designed to react quickly primarily for spray applications, such as bond/tack coats, aggregate chips seals, sand seals and similar surface treatments.
Rapid curing Cutback bitumen are typically used as prime coats and tack coats. Generally, Cutback Bitumen are divided into three groups depending on their volatility of the solvent added
After a RC cutback is applied the solvent evaporates away and only the Bitumen is left. A rapid curing cutback bitumen is said to cure as the petroleum solvent evaporates.
RC Cutback Bitumen Packing
Bulk as IBC Tank, Flexi Tank
Reconditioned steel drums 220 lit., Net Weight: 191 ± 3 Kg
New steel drums 220 lit., Net Weight: 191 ± 3 Kg
RC Cutback Bitumen Safety
Refer to Safety Data sheets before use.
Transport, use and store at the lowest temperature possible.
Eliminate all potential ignition sources during application.
Avoid breathing vapors. Avoid contact with skin.
Always wear appropriate PPE including heat protection when used hot.
DO NOT allow product or washings to enter stormwater or sewer systems.
Cutback Bitumen
Cutback Bitumen Description
Cutback Bitumen ( Liquid Bitumen ) is Bitumen that is dissolved in a solvent. Typical solvents include Naphtha, gasoline and kerosene, white spirit etc. The type of solvent controls the curing time while the amount determines the viscosity of the Liquid Bitumen. Bitumen is ‘cutback’ by adding controlled amounts of petroleum distillates such as kerosene. This is done to reduce the viscosity of the bitumen temporarily so it can penetrate pavements more effectively or to allow spraying at temperatures that are too cold for successful sprayed sealing with neat bitumen. The materials used to cutback bitumen will evaporate after application to leave the remaining material similar in hardness to the original bitumen.
Cutback bitumen is a range of binders that are produced by blending (mixing) penetration grade bitumen and a hydrocarbon solvent, such as paraffin or mineral turpentine.
When the solvent has evaporated, the binder returns to its original penetration grade to tie the particles together. Cutback bitumen gets its name from the solvent that is involved in the process, because the solvent “cuts back” or evaporates, leaving behind the binder to “get on with the job”. The solvent used in cutback bitumen is called the “cutter” or “flux”.
Three types of solvents are used for the blending process: slow-curing, medium-curing or rapid-curing solvents. The latter two are the most common in South Africa. The choice of the solvent determines the rate at which the bitumen will cure when exposed to air. A rapid-curing (RC) solvent will evaporate faster than a medium-curing (MC) solvent. Curing relates to the evaporation rate of the solvent which influences the setting time of the bitumen. The viscosity of the cutback bitumen is determined by the proportion of solvent added: the higher the proportion of solvent, the lower the viscosity of the cutback.
Cutbacks differ from penetration grade bitumen in that they are more workable — in other words, they can be more easily reshaped. Less heat is required to liquefy cutback bitumen than penetration bitumen, making it easier to use at lower temperatures.
Typical cutback bitumens are MC 30 and RC 250. The letters in the name refer to the curing action of the solvent, and the number to the viscosity of the binder.
Cutback bitumen is classified based on viscosity grade. It is divided into three categories:
1- Rapid-Curing (RC) :The cutback bitumen is known as rapid-curing (RC) if the bitumen is solved in gasoline. The reason is that evaporation occurs quickly and the bitumen is deposited.
2- Medium-Curing (MC) :MC cutbacks are prepared by solving bitumen in kerosene which evaporates more slowly than gasoline.
3- Slow-Curing (SC) :Slow-curing cutback may be achieved from solving bitumen in gasoil or fuel oil or directly from distillation of crude oil.
Application of Cutback Bitumen
Cutback bitumens suitable for primer sealing can also be used in the manufacture of pre-mix asphalt, which is used in patch repairs. Cutback bitumens are used extensively in sprayed sealing applications, particularly in cooler weather where they provide improved initial stone retention due to their lower viscosity. Typically, a single application of the appropriate cutback bitumen is sprayed onto the primed pavement onto which aggregate is laid.
Prime and Tack Coating
The process of priming involves applying a low viscosity binder to a prepared but usually unbound aggregate base. It is intended to be absorbed by the top layers of the base and provide a surface more easily ‘wetted’ by a subsequent bituminous covering. The primer will be able to carry traffic for a short time (although this practice is uncommon) and help control dust. Generally, primers are applied at rates between 0.5 and 1.4 L/m2. Cutback bitumens suitable for priming are also used for tack coats, which are applied to an underlying surface to help with the adhesion of subsequent asphalt layer. A typical application rate is between 0.2 and 0.4 L/m2.
Prime Sealing
Where temperatures are too cool for an effective priming operation, or where traffic is likely to upset a primed surface before the final seal can be sprayed, a primer seal can be used to give adequate protection of the pavement for periods of up to 6 to 12 months. Cutback bitumens suitable for primer sealing can also be used in the manufacture of pre-mix asphalt, which is used in patch repairs.
Spray Sealing
Cutback bitumens are used extensively in sprayed sealing applications, particularly in cooler weather where they provide improved initial stone retention due to their lower viscosity. Typically, a single application of the appropriate cutback bitumen is sprayed onto the primed pavement onto which aggregate is laid.
HJ Oil GRUOP supplies and provides transfer of technology for production of all cutback Bitumens in correspondence to ASTM D2026, D2027, D2028, AASHTO M82-75 (2008), AASHTO M92-92 (2008). For any inquiries, please contact our sales team on info@www.hjoilgroup.com
- Slow Curing Cutbacks (ASTM D2026)
- Medium Curing Cutbacks (ASTM D2027 or AASHTO M82-75 2008)
- Rapid Curing Cutbacks (ASTM D2028 or AASHTO M81-92 2008)
USES OF CUTBACK & EMULSION BITUMEN IN DIFFERENT SYSTEMS OF ROAD MAINTENANCE
System | Description & Uses | Recomende Product |
SurfaceDressing | An application of binder on the road surface by a bitumen distributor followed by a covering of aggregates/chippings spread by a hopper gritter. Can be a single or double-layer surface dressing | Cutback: MC -3000 |
Prime Coating | An application of binder on a granular base to prepare for an asphalt surfacing .Normally a slow setting emulsion or cutback is used for better penetration purposes to seal off the road base. The rate of application can vary from 0.4-1.4 liter/m2 | Cutback : MC-30 MC -70 |
Tack Coating | A very light application of binder –hand or machine sprayed –to ensure bonding between the existing layer and the new overlay. The rate of application is normally between 0.25-0.7 liter/m2, depending on the surface being sprayed | Emulsion: K1-40 : RS-1K: RS-2K |
Semi– Grouting /Penetration Macadam | An application of hot binder on a compacted layer of coarse aggregate | Emulsion : RS-3K : MC-3000 Other : Bitumen |
Slurry Sealing | A maintenance technique where specially tailored emulsion, aggregates, water, and /or mineral filler is mixed in an on-site distributor and spread on an existing road surface at a thickness of 3-6 mm. It is both a preventive and corrective maintenance method for sealing of surface cracks, waterproofing asphalt surfaces and stopping oxidation | Emulsion: ALFA/SS |
Fog Sealing /Mist Spraying | It is similar to tack coating in that is a very light application of diluted emulsion for renewal/rejuvenation of old asphalt surfaces. The emulsion is usually diluted to a concentration of about 25-30% binder and applied at a rate of 0.3-0.8 liter/m2 | Emulsion : K1-40 : SS-1K : ALFA |
Dust Binding | A light application of 0.5-2.0 liter/m2 using diluted bitumen emulsion for dust control on unpaved roads | Emulsion: K1-40: SS-1K |