Asphalt is relatively unfamiliar to everyone. Asphalt is a complex dark-brown mixture composed of different molecular weight hydrocarbons and their non-metallic derivatives. It is a kind of high-viscosity organic liquid . Asphalt is widely used in pavements and buildings. Waterproofing, roof coating, anti-corrosion of linoleum, sleepers, poles, thin layers of steel pipes, etc. What is the asphalt marking? The marking of asphalt is also the grade of asphalt. At present, there are many classification methods in the world. The following Xiaobian will introduce the division of asphalt markings. Let's take a look!
What is asphalt
Asphalt is a product of the crude oil processing process. It is a black or dark brown viscous liquid or solid at room temperature. It is a brownish-black organic gel-like substance, including natural asphalt, petroleum asphalt, shale asphalt and coal. Tar asphalt and other four. The main components are asphaltenes and resins, followed by high boiling point mineral oils and small amounts of oxygen, sulfur and chlorine compounds. Glossy, liquid, semi-solid or solid, brittle at low temperatures, good adhesion and corrosion protection.
The use of asphalt
The main uses of asphalt are as basic construction materials, raw materials, and fuels. Its applications include transportation (roads, railways, aviation, etc.), construction, agriculture, hydraulic engineering, industry (excavation, manufacturing), and civil use.
Asphalt is used in a large number of applications for the treatment of pavements and buildings, laying roofs, producing anti-corrosion of linoleum, sleepers, poles, and thin layers of steel pipes. Extra-hard asphalt is also used as a filler for electrical insulation materials and rubber products.
Classification of asphalt markings
The division of asphalt marks is closely related to the road petroleum asphalt standards of a country. At present, it can be roughly divided into three categories: one is the penetration grade; the other is the viscosity grade at 60°C; and then is the PG grade of US SHRP/SUPER.PAVE asphalt binder material performance specification.
(1) Viscosity grading
Some countries in the United States, Australia, Canada and other countries use this method to classify asphalt. The classification index is mainly the viscosity of 60°C, and the asphalt is divided into different grade labels in combination with the asphalt high temperature stability index, low temperature crack resistance index, anti-aging index, quality uniformity index, construction performance index and safety performance index, etc. At the time of construction design choice.
(2) Penetration grade
Since it was first proposed in 1918, it has been used for nearly a century. Most countries have adopted the penetration criteria. Most of the main grading indicators for this method are needles at 25°C, and like the viscosity grading, the asphalt is divided into different grade labels for selection in combination with other performance indicators.
(3) PG performance classification
This classification method is the core content of the road performance specification for US SHRP asphalt binders. It classifies asphalt into seven grades and 21 sub-grades. The seven grades are PG46, PG52, PG58, PG64, PG70, PG76, and PG82. Grade from -10 °C - 46Y, a file every 6 °C. PG is the prefix of PerformanceGrade, indicating that it reflects the road performance, and the grade directly uses the design use temperature to indicate the scope of use. SUPERPAVE asphalt binder road performance levels are determined according to local temperature conditions:
Design maximum temperature: 7d highest average road surface temperature (adopt the 7d cycle average temperature with the highest temperature in the year at the depth of 20mm below the road surface);
Design minimum temperature: The minimum temperature of the year limit, using the minimum temperature at the road surface.
At the same time, a 20-year representation with a guarantee rate of 95% or 98% is determined based on the road grade and traffic volume. For example, PG58-28 indicates that the asphalt is suitable for the maximum pavement design temperature not exceeding 58°C and the minimum pavement design temperature not lower than -28°C.
Editor's summary: The relevant information on what is the division of asphalt and asphalt markings was introduced here. I hope this article will be helpful to everyone. If you still have something you don't understand, you can leave a message to Xiaobian at the bottom. We will answer your questions as soon as possible.
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