Oxidized Bitumen, Blown Asphalt, Blown Bitumen, Oxidized Asphalt

Oxidized Bitumen

OXIDIZED BITUMEN

Oxidized Bitumen or Blown bitumen grades are produced by passing air through the penetration grades. This process results in more rubbery property of the bitumen than its original formula and they are simply harder bitumen. When tempered by controlled temperature, hard bitumen is widely used as an anti-slip layer compound in the piling industry, production of roofing felts, roofing and waterproofing industries, sound dampening felts and carriage sealant in the automotive industry, electric cable joint protection, joint filling compound, sealant compound and many others. It is also used in sealing saw cuts and joints where expected movements are minimum. It is also used in the manufacturing of bituminous marine mastic for the oil & gas pipeline joints.

Oxidized bitumen is Blown Asphalt which is exporting in various grades as Oxidized Bitumen 115/15, Blown Bitumen 90/40, 75/25, 85/25, 90/15, 105/35, 150/5, 95/25 and any other grade will produce according to order. RAHA OIL is a dynamic and multi-faceted limited company actively involved in manufacturing procurement distribution and export of various grades of Oxidized Bitumen. We are structured into focused on oxidization of Bitumen division to serve the different needs of our customers worldwide. We have a long history of supplying Oxidized Bitumen to bitumen factories, asphalt companies, roof insulation companies and membrane sheet manufacture Throughout the world, more than 7 types of bitumen that is produced depend on the type of weather conditions one of them is Oxidized Bitumen or Blown Bitumen, Oxidized Bitumen grades are suitable for sealing saw cuts and joints where there is expected to be the minimum amount of moving in the joint. Their wide temperature range prevents bleeding in high-temperature applications.

RAHA OIL is also capable of producing other grades of Oxidized Bitumen according to the specifications of individual clients. Some of the major advantages of Oxidized Bitumen are that it is completely water resistant, highly flexible and durable. Further, it is chemically very stable. Oxidized bitumen is a very flexible compound that is not only chemically stable but also a very durable compound apart from being completely water resistant. Lastly, Oxidized Bitumen has some very prominent technical advantages that makes it a very sought after compound in various applications.

OXIDIZED BITUMEN USES

Oxidized Bitumen have different usages in different type industries so we will mention some of important applications of Oxidized Bitumen for you in this articles, Oxidized Bitumen in Gas and Oil industries would be using as coating materials for pipe lines and pipe joints of Oil And Gas Pipeline, lines, in electrical industries Oxidized Bitumen would be use as sealant of wire coating, blown bitumen is using in waterproofing industries too like building roofing felts in factories and first materials components who are producing waterproofing roofing felt sheets, Oxidized Bitumen is using in Bitumen and Asphalt factories for producing different grade of Bitumen and Asphalt for road paving at least one of the other usages of Oxidized Bitumen would be in sound dampen layer it is using as one of important materials for making Sound insulation layers.

TECHNICAL POINT AND OPERATING CONDITIONS

The blowing should be done from the bottom of blowing tanker. The reaction between bitumen and air is calorific. If the heat produced during the mixture is high, the heat of reaction is controlled by water injection. The admixture of air and the volume of blowing air is two important variants in blowing process. In bitumen producing the plant, bitumen 60/70 is usually got by blowing. In this case for making bitumen 90/15 or 85/25 distilled used oil or crude oil should be injected to the product according to the volume 20-25 % otherwise the fragility in bitumen lead to inferior production. Increasing the heating temperature, air injection amount, time and tower pressure increase the speed of production process reaction. The suitable temperature for production operation is 265-270°C which should be controlled not to be ascended since in high temperature and in 288°C intensity of reaction becomes more severe and uncontrollable which lead to the explosion in the tower. The long time stay of bitumen in the tower in any condition is not in favor of system and should be delivered to drum or empty tanker after being ready. If the liquid surface in blowing tower is low, not more than particular limit should be added to the system for the extra air gather in empty parts and lead to ignition nearly. And if the temperature is kept high, the inside heat of tower ascend fats and this issue cause inside explosion and endamage the system. Blowing tower is filled up to 70%. Air injection is done in 190-232°C. The final point of blowing is specified by sampling and testing of bitumen properties. Finally, the temperature of the product should be kept 150- 165 °C in order to have loading and packing capability.

HOW TO PRODUCE OXIDIZED BITUMEN?

Bitumen heating to 265-270 °C
Transferring melted bitumen to blowing towers
Blowing air to bitumen
Cooling melted bitumen with water
Packing

The procedures for producing oxidized bitumen are as follows:

Continuous blowing procedure.
Discontinuous blowing procedure These two procedures are done by the other two procedures named catalysis and anticatalysis.

Catalysis means adding some chemical material during the process In order to decrease the blowing reaction time for the following reasons:

Ease and simplicity in changing blowing condition and have the product with different grades as a result.
Ease in generating the unit.
Ease in technology and also low expense in investment. The discontinuous producing procedure is chosen.

THE PRODUCTION PROCESS

The producing operation of oxidized bitumen mainly includes tank loading different steps, bitumen blowing, condenser external gasses and packing. So, in the beginning, the loose bitumen shipped to the plant by tanker is transferred to the raw material store tanker. In order to transfer the bitumen easily to the blowing tower, the burner is contrived at the bottom of the store tanker to heat them. It is necessary to say that if the blowing towers are empty, hot bitumen can be uploaded directly to them and blowing operation start. Since the volume of bitumen increases as a result of blowing and it may overflow, the blowing tower is filled up to 70 %. Air injection is usually done when the temperature of material reach to 190-230 °C. For gradual heating and also pipes filling with the air is entered from the top of the tower and at the bottom, the bitumen dispread monotonously in phase via nozzle then oxidation is done accordingly and the light molecule, volatile gasses, and steam are emitted from the top of the tower. Blowing operation is done in the temperature range 215-290°C but the suitable temperature is between 265 to 270°C. The needed heat is provided by burner contrived at the bottom of the tower. The bitumen reaction is calorific so in order to prevent the explosion danger resulted from temperature increasing, the temperature can be controlled by water injection, burner extinguisher and air amount reducing.
Blowing end point is usually signified by sampling from tower and bitumen properties testing. The blowing operation stops when oxidized bitumen reaches to specified properties. After this in order to fix the final point and depolymerization bitumen got in high temperature. It is necessary to be transferred to store after packing and presented to sale. It is necessary to say that the produced gas and steam entered the condenser through the pipe fixed at the top of the blowing tower. In this stage, the bad smelling gasses and oily and volatile parts are separated from then transfer to sewage accompanied with water. Other unseparated gas parts are emitted from the top of the condenser then transfer to the furnace and burned there. After cooling the blowing oven and reaching them to 150-160°C, all the content of blowing oven which is hard bitumen is able to be loaded and packed. Because of the liquid height in blowing tower, oxidized bitumen is transferred by specific gravity and there is no need to use the pump. Packing is done in two sections and in 220-liter drum and 35 kg carton. For fast operation (preventing from cooling & hardening) in every section, several taps are fixed so that it can fill specific drum and carton with bitumen at the same time.

TECHNICAL ADVANTAGES

Durability
Flexibility
Water Resistant
Chemical Stability

Compared to paving grade bitumen:

Reduced temperature susceptibility
Exhibits a more ‘solid’ nature at ambient temperatures
High penetration index

The standard test methods used to obtain each property is as below:

Specific Gravity: ASTM D70
Penetration: ASTM D5
Softening Point: ASTM D36
Loss on heating: ASTM D6
Flashpoint: ASTM D92
Solubility: ASTM D4
Ductility: ASTM D113
Spot test: AASHTO 102

BLOWN ASHPHALT APPLICATION

Oxidized bitumens are used almost entirely for industrial applications, e.g roofing, flooring mastics, pipe coatings, paints, etc, and are specified and designated by both softening point and penetration tests.

Used As a bonding bitumen for roofing sheet membranes.
Used As a hot-applied waterproofing layer.
Used As a raw material for liquid bitumen coatings.
Used in production of bituminous paint, mastic.
Used in rust proof pipe coatings.
Used as an anti-slip layer compound in the piling industry.
Used in production of roofing and sound dampening felts.
Used as under carriage sealant in the automobile industry, electric cable joint protection, joint filling compound, sealant compound and much more in our day to day life.

We are also capable of producing other grades of Blown Bitumen upon request by our customers. Oxidized Bitumen high softening temperatures qualify them as the excellent sealant for prevention from bleeding in high-temperature applications. Blown Grade Bitumen shall be broken up into small pieces (for the blown grade in molded cake form) and heated slowly to the application temperature of 220ºC to 230ºC. Oxidized Bitumen is predominantly used in the piling industry as an anti-slip compound for the manufacture of undercarriage sealants in the automobile industry. It is also used as a sealant compound, as a joint filling compound apart from being used in the manufacture of roofing felts and sound dampening felts. Further, Oxidized Bitumen is used in the manufacture of bituminous marine mastic, which is required for the oil and gas pipeline joints. This Oxidized Bitumen is available in different grades like 95/25, 85/25, 75/25, 90/40 and 115/15. Oxidized is also capable of producing other grades of Oxidized Bitumen according to the specifications of individual clients.
Blown Bitumen Grades are suitable for sealing saw cuts and joints where there is expected to be the minimum amount of moving in the joint. Their wide temperature range prevents bleeding in high-temperature applications. Oxidized bitumen can also be used in industrial applications like roofing, flooring, mastics, pipe coatings, electrical applications to name a few.

ALL GRADES OF OXIDIZED BITUMEN

BLOWN ASPHALT PACKGING

RAHA OIL is a manufacturer of all grades of blown asphalt in various packing as below:

Packing of Bitumen Oxidized

There are different types of packaging for hard asphalt, which include: Blown asphalt packed in 25 to 50 kg soluble polyamide bags, the size of the bags is 40 x 90 cm. It is easy to put a ton on a wooden envelope. Blown asphalt is also packed in cartons. It is easy to transport and it is safe to transport. In addition, we can pack hard bitumen in Craft bags with palletizing capability. Oxidized Bitumen in various packing, is available in 20 & 50 Kg Kraft Paper Bags 25 Kg Carton box & 200 Kg Steel Drums:

25 KG CARTON BOX

25kg mold packing: It is most expensive packing since there is mold on and with same mold, we can ship out. The mold is carton and at destination you can remove the mold easily.

25Kg Polyamide bag: It is a heat resistance bag and filling directly in water to cool down fast. It is firstly use not possible to take out the Polyamide from the bitumen and then use.

25kg craft bag: Craft bag is recycle packing and inside is special material to prevent sticking the bitumen to bag. This grade is also possible to load on pallet or without pallet for customer.