Bitumen Waterproofing Coating
Bitumen is a waterproofing product has high water repellent and resistant quality. There are different types of bitumen available in the market. These waterproofing chemicals have different properties and specifications and it is used on the basis of requirements of consuming industry. Bitumen waterproofing coating is considered the best treatment of roof leakage problem.
The word specification means bitumen shows variation, durability and different physical properties. Below we discuss the different types,properties and uses of bitumen.
Types of Bitumen, properties and uses
Different types of bitumen are mentioned below
1-Polymer modified bitumen
2-Oxidized bitumen grades
3-Cut back bitumen
Polymer Modified bitumen
This type of bitumen is obtained by the modification of strength of this chemical. Here for this chemical normally 8% polymer is added.The polymer which is used to make this type of bitumen may be plastic based or rubber based. It varies the strength and Elastic properties of bitumen.
Polymer modified bitumen have increased elastic response. The cohesive property and fraction strength of bitumen is improved by the induction of polymer in bitumen.
Polymers used in polymer modified bitumen are styrene block, co-polymers, synthetic rubber, natural and recycled rubbers. Thermoplastic polymer is also used in polymer modified bitumen.
Oxidized bitumen grades
Refined bitumen is further treated by the introduction of processed air to obtain the oxidized bitumen. A controlled temperature is maintained and air is introduced under a specified pressure into the bitumen to make oxidized bitumen. Higher molecular weights are seen in the time of reaction of bitumen components and introduced oxygen. In the result of this reaction the pitch of this waterproofing chemical increases.
Oxidized bitumen is widely used in industrial applications such as roof waterproofing and bitumen coating for pipes. This type of bitumen has lower penetration because of this method used to make oxidized bitumen. Bitumen with this property can be employed for paving road.
In this type of bitumen volatile oil is used that reduced the viscosity of bitumen. When this type of bitumen is applied on the required surface the volatile material oil is evaporated and bitumen gains its original viscosity.
Bitumen waterproofing chemical have different grades, the penetration grade bitumen has thermoplastic material it shows the different value of viscosity for different temperature. For the construction of roads it is necessary that material used to be fluid in nature during surface dressing.It is essential for bitumen chemical to regain back to its original hardness, this is ensured by cutback bitumen. The fluidity of bitumen can be increased by raising the temperature. But when it is necessary to keep the fluidity at lower temperature, cutback bitumen is employed.
This type of bitumen is mixture of two liquids. One of them is dispersed to other liquid as a result of this dispersion bitumen emulsion is formed. This type of bitumen has a long hydrocarbon chain. The emulsion of two fluid provides an electrochemical environment. The ionic part of the chain has an affinity towards water and bitumen is attracted by the hydrocarbon part. This emulsion can be cationic or anionic.
The stability of bitumen emulsion is depending upon the quantity and size of bitumen applied. Water evaporation rate and mechanical forces also decide the stability of bitumen emulsion. Bitumen emulsion is applied by using sprays. The mixture becomes more viscous with increase in emulsion coating.
This type of bitumen is refined bitumen that has different viscosity. The penetration test of this bitumen is carried out to characterize the bitumen on the basis of hardness. Because of this penetration test it is known as penetration bitumen