Oxidized asphalt takes you to understand poured asphalt concrete

Upload time :2022/7/14 14:32:03

Epoxy Asphalt: The mixture obtained by the oxidized asphalt messy chemical modification of epoxy resin, curing agent and base asphalt is modified asphalt. Epoxy modified asphalt is a thermosetting asphalt with a three-dimensional staggered structure composed of chemical reaction of component a (epoxy resin) and component B (acid anhydride asphalt, carbon curing agent, functional polymer, emulsifier and curing reaction catalyst). Epoxy asphalt concrete has been widely used in steel bridges, paving stones and other special paving stones at home and abroad in recent years due to its excellent durability, durability and similar strength and stiffness to concrete. This is a good example.


Today, there are three types of bridge asphalt pavements in the world: cast asphalt concrete, epoxy asphalt concrete, and asphalt stone (SMA). Practice has shown that in addition to the use of superior epoxy bitumen within three years of completion of the bitumen, risks have arisen on the bitumen, which has been maintained for about four years. Therefore, epoxy-modified asphalt is the material of choice for surface covering of bridges. This is a good example.


Modified bitumen: Now, SBR modified bitumen and SBS modified bitumen are widely used in thermoplastic rubber. There are also new resins, modified asphalts and silica asphalts, and now SBS asphalts have the largest planning, highest power and greatest stability.


SBS Modified Asphalt: During the production process, SBS (Styrene-Butadiene-Styrene Copolymer) modifies the asphalt, which significantly improves the physical properties and modification of the asphalt. This is a good example.


Asphalt: diesel, gasoline, etc. After all, the remaining bitumen can be divided into three types: coal bitumen, petroleum bitumen and natural oxidized asphalt bitumen. This is a good example.


One thing is coal tar pitch: Coal tar pitch is a coke product, the black substance that remains in the burner after the tar is distilled. It differs from resin cleaning only in physical properties, and there is no clear binding. The general classification method is to set the softening point of resin below 26.7°C (cube method), and set the softening point of asphalt above 26.7°C. Temperature instability has a great impact on coal tar pitch, which is easily broken in winter and softened in summer. This is a good example.


Petroleum bitumen: Petroleum bitumen is the waste of petroleum distillation, which is semi-solid or solid at a certain temperature, depending on the degree of extraction of the liquid. Petroleum pitch is distilled above 400°C in the production process, and has the characteristics of black color, luster, high temperature resistance, etc. Its evaporative components are not many, but there may still be high molecular hydrocarbons. These hydrocarbons do not evaporate without evaporating. More or less harmful to human health. This is a good example.


Natural bitumen: Natural bitumen is stored in the ground, some of which forms deposits or is deposited on the surface of the earth's crust. This bitumen is primarily vaporized and oxidized naturally, and is generally free of toxins. This is a good example.


The building primarily uses petroleum asphalt, a mixture of complex hydrocarbons and their non-metallic derivatives. The ignition temperature of asphalt is generally between 240°C and 330°C, and the ignition temperature is about 3°C to 6°C higher than the flash point, so the planned temperature should be lower than the flash point.

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