Iran Cutback Bitumen Manufacturer
Overview of Cutback Bitumen
Cutback bitumen (liquid bitumen) actually is bitumen dissolved in a solvent. Common solvents include naphtha, gasoline, kerosene, white spirit, etc. The kind of solvent controls the curing time and the amount decides the viscosity of the cutback bitumen.
The purpose is to reduce the viscosity and increase the penetration of bitumen into the asphalt surface. Compared to bitumen, cutback bitumen is sprayed onto different road layers at considerably lower temperatures. As soon as the solvent evaporates, the remaining bitumen corresponds in terms of hardness to infiltration bitumen.
environmental regulations. Cutback asphalt contains volatile chemicals that evaporate into the atmosphere. Emulsified asphalt evaporates water into the atmosphere. Loss of high-energy products. The petroleum solvents used are energy intensive and expensive to manufacture compared to water and emulsifiers used in emulsified asphalt.
In many locations, reductions in asphalt use are limited to patch materials for use in cold climates.
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Advantages of Cutback Bitumen
The advantage of cutback over emulsions is the much higher percentage of residual bitumen, typically 80% or more, compared to 40-65% or more for bituminous emulsions. As a result, after curing, more bitumen remains in the pavement even with the same amount of binder.
Classification of cutback asphalt: Iran cutback bitumen manufacturer
Cutbacks are divided into two categories, rapid cure (RC) and medium cure (MC), depending on the solvent used. They are further defined by a number that demonstrates the minimum kinematic viscosity (flowability) of cutback. RC is suggested for surface dressing and patchwork. MC is suggested for premixes with less fine aggregate. SC is used for premixing with significant amounts of fine aggregate.
Rapid-curing (RC) cutback asphalt cement is a combination of asphalt cement with highly volatile lightweight diluents, usually in the gasoline or naphtha boiling range. There are fast-setting cutback grades such as RC-30, RC-70, RC-250, RC-800, and RC-3000.
Fast-hardening cutback asphalt is liquefied by mixing asphalt cement with petroleum-based solvents. The RC cutback asphalt described herein is intended to be suitable for road use.
Medium cure (MC) cutback asphalt is defined as grades of asphalt manufactured using medium volatility kerosene as a primer in the boiling range (MC-30, 70, 250, 800, 3000). The mix is done in cold mode. Cutback bitumen or asphalt is classified by curing as 1) slow cure, 2) medium cure, and 3) fast cure.
Since kerosene is a moderately volatile liquid compared to naphtha and light oil, medium hard-cut asphalt has a moderate level of vaporization. The degree of fluidity depends on the mixing ratio of kerosene and asphalt cement. The following specifications for medium cure cutback asphalt and its properties are: Medium cure cutback asphalt is used for flexible pavements for surface dressing, prime coating, and tack coating. This grade is used with aggregates to improve mixing workability.
The degree of fluidity that occurs in each case mainly depends on the ratio of solvent to asphalt cement.
To a lesser extent, the hardness of the base asphalt can affect cutback fluidity. A level of fluidity is evident in some grades of cutback asphalt. Some are very fluid at room temperature, while others are a little more viscous. Viscous grades may need to be heated slightly to make them flowable enough for construction work.
MC grade is planned for mixing with aggregates. Mixtures using these grades do not readily decompose in contact with aggregate, so mixes using them have a long shelf life and are suitable for cold mix storage.
The cut is designed to “harden” as the petroleum solvent evaporates. Due to environmental regulations, the amount of cut asphalt used is on the decline. Medium-cure (MC) asphalt cement generally uses medium-volatility medium diluents in the kerosene boiling range (MC-30, 70, 250, 800, 3000).
Low-setting (SC) asphalt cement and low-volatility oils are generally in the heavy fraction range (SC-30, SC-70, SC-250, SC-800, and SC-3000). The degree of fluidity that occurs in each case mainly depends on the ratio of solvent to asphalt cement. Cutback fluidity can be slightly affected by the hardness of the base asphalt from which the cutback is made.
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Several grades of cutback asphalt are available, depending on the level of fluidity. Some are very fluid at room temperature, others are a little more viscous. Viscous grades may need to be heated slightly to make them sufficiently fluid for construction services.
Slow Cure (SC) cutback asphalt is often referred to as road oil and is primarily used for road mixing and dusting. The term comes from the early days when residual asphalt oil was used to give roads an inexpensive, weather-resistant surface. SC cutback asphalt is also used as a tailings mix, factory mix with graded aggregates, and in some cases as a primer.
Slow hardening reduction can be done by dissolving bitumen in gas oil or fuel oil or directly from the distillation of crude oil. SC cutbacks do not evaporate under normal weather conditions but undergo gradual molecular morphology changes. This type of bitumen is obtained by dissolving bitumen 85/100 in heavy solvents such as light and fuel oils, which not only evaporates but also hardens.
Slow cure (SC) cutback asphalt cement combines asphalt cement with low volatility diluents, typically in the heavy fraction range.
The degree of fluidity that occurs at each cutback is primarily dependent on the ratio of solvent to asphalt cement. Cutback fluidity can be slightly affected by the hardness of the base asphalt from which the cutback is made. There are several grades of cutback asphalt depending on the degree of fluidity, some being very fluid at ambient temperatures, others being a little more viscous. Viscous grades may need to be heated slightly to make them sufficiently fluid for construction services.
Slow cure (SC) cutback asphalt is often referred to as road oil and is primarily used for road mixing and dust suppression applications. The term comes from the early days when residual asphalt oil was used to give roads an inexpensive, weather-resistant surface. Slow-curing cutback asphalt is also used in heap patch mixes, sometimes blended with graded aggregates and vegetation, and used to prime grainy surfaces.
Application of Iran cutback bitumen manufacturer
Cutback bitumen suitable for primer sealing can also be used in the production of premixed asphalt used for patch repair. Cutback bitumen is widely used in spray sealing applications. It is especially used in colder climates where its lower viscosity improves initial stone retention. A suitable cut bitumen is sprayed once on the primed pavement where aggregate is usually applied.
Iran cutback bitumen manufacturer