Asphalt, as a mixture of sand, sand and bitumen, is considered the most important and main element of road construction and can play a big role in various industries such as global transportation. This material dates back to hundreds of years before Christ, but today's modern asphalt was invented by Scottish engineers and used all over the world since the beginning of the 20th century. Asphalts have different types, such as hot asphalt, cold asphalt, and protective asphalt, and each of them can have many features, capabilities, and applications. Although the implementation of asphalt using modern and advanced equipment and devices can have high quality, accuracy, thickness and durability, but it can also be implemented in a traditional and manual way. In the following article, we will discuss how to implement manual asphalt and its important points.
What is meant by manual asphalt?
As mentioned, asphalt is a combination of materials such as bitumen, sand, and has high resistance to pressure, impact, humidity, temperature changes, etc., and is considered the best material for covering the surface of roads, streets, alleys, etc. Manual asphalt is basically a specialized technique and technique for the implementation of this material and is usually used in repairs and small projects. Unlike machine asphalts, where modern and large machinery equipment is used to spread hot mix asphalt, manual asphalts are implemented by workers and traditional tools. Manual asphalt, like other types of industrial asphalt, is made from similar materials such as sand, sand, natural bitumen and mineral bitumen, but in environments where it is not possible to use large and modern machines, human forces and simple tools such as shovels, hand rollers and … will be used.
The difference between machine and manual asphalt work
Car asphalting is basically done using equipment and machinery such as a paver machine, while in the manual method human forces and simple and traditional tools will be used. The paver machine is able to asphalt a large area of the road and different surfaces at high speed, while manual asphalt work requires more time. The asphalt surface of the machine can be much smoother and smoother than the manual asphalt. In asphalt, mechanized work can implement larger areas in a shorter period of time. Manual asphalting is an ideal method for asphalting small areas, repairing damaged parts, etc.
Manual asphalt execution steps
Asphalt is a material that can be highly resistant to water and moisture, pressure, impact, cold and heat, etc., but it can perform well and have a high durability when its implementation steps are carried out correctly. In general, the implementation of manual asphalt is done like machine asphalt and has similar steps. The most important steps in the implementation of this asphalt are as follows:
Proper infrastructure
If the purpose of manual asphalt is to repair the damaged points of old asphalt or to level a new section, the most important step is the foundation. At this stage, it is necessary to remove all unevenness, lowness and height, and prepare the surface for primary bituminous spraying. If the desired surface is not smooth, the asphalt will break, tear and damage after some time and under pressure due to factors such as humidity, temperature changes, etc.
Initial bituminous spraying (Primact stage)
In the second stage, after the desired surface is prepared and smooth, it is time to sprinkle bitumen. This step is done to increase adhesion. When the initial bituminization is done, the stones, soil and other materials on the surface stick together and are ready to receive the next materials.
Pouring a thin layer of bitumen (single coat stage)
In the third stage, after the foundation and initial bitumen spraying, it is time to apply a thin layer of bitumen. At this stage, in order to increase the adhesion of asphalt, a thin layer of bitumen can be poured on the surface of asphalt or concrete. This thin bitumen layer can increase the adhesion of asphalt to the materials on the surface and increase its quality and durability.
Hot asphalt spraying
In the fourth step, after the complete implementation of the previous steps, it is time to sprinkle asphalt materials on the desired surface. At this stage, warm asphalt should be spread evenly and with a similar thickness on the desired surface. To spread asphalt, you must use safety equipment such as shoes, gloves, etc., so that its high temperature does not cause injury to people.
Final asphalt rolling
In the final stage, after spraying hot asphalt on the desired surface, a roller can be used to compress and smooth it. Asphalt rolling can be affected by factors such as temperature, asphalt adhesion, roller weight, etc. This step should be done by experts and experienced people so that the
asphalt has high quality, strength and durability and does not get easily damaged.
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