[1]. EVA modified bitumen EVA has good compatibility with bitumen and can be dissolved and dispersed in hot bitumen without colloid mill or high-shear mechanical processing, making it easy to use.
In recent years, bitumen pavement projects in Africa have been used more frequently, so domestic counterparts are reminded to pay attention.
[2]. High viscosity, high elasticity and high toughness modified bitumen. The bitumen viscosity and toughness test is more suitable for SBR modified bitumen, but when used for high viscoelastic modified bitumen, demoulding often occurs, making the test impossible. In view of this, it is recommended to use a universal material testing machine to conduct the viscosity and toughness test of highly viscoelastic modified bitumen, record the stress-strain curve, and use the integration method to easily calculate the test results. 3. High-content rubber composite modified bitumen With the carbon peak and the formulation of carbon neutrality goals, energy conservation and emission reduction are imperative. The tire industry has been facing the problem of "mass production and mass waste" since its invention and manufacturing. Tires require direct or indirect consumption of natural resources and energy from production to disposal, causing a large amount of carbon dioxide emissions.
The main component of tires is carbon, and even discarded tires have more than 80% carbon content. Waste tires can recover a large amount of materials and energy, fix carbon into products, and achieve the purpose of energy saving and emission reduction.  Waste tires are polymer elastic materials that are very difficult to degrade. They have high elasticity and toughness and almost no physical or chemical changes occur in the temperature range of -50C to 150C. Therefore, if they are allowed to degrade naturally in the soil, they will Without affecting the extent of plant growth, the process could take about 500 years. A large number of waste tires are piled up arbitrarily and occupy a large amount of land, preventing the effective use of land resources. Moreover, long-term water accumulation in tires will breed mosquitoes and spread diseases, causing hidden dangers to people's health.
After mechanically crushing waste tires into rubber powder, high-content rubber compound modified bitumen (hereinafter referred to as rubber bitumen) is produced for road paving, realizing comprehensive utilization of resources, greatly improving road performance, greatly extending road life, and reducing road costs. Construction Investment.

[3]. Why is it “high-content rubber compound modified bitumen”?
Low temperature crack resistance
The rubber in the waste tire rubber powder has a wide elastic temperature working range, so the bitumen mixture can still maintain an elastic working state at low temperatures, delay the occurrence of low-temperature cracks, and stabilize the high-temperature rubber powder in the bitumen, which significantly increases the viscosity of the bitumen, which increases the softening point and greatly improves the high-temperature stability of bitumen and mixtures. The anti-skid and noise-reducing fracture-graded bitumen mixture has a large structural depth and good anti-skid performance on the road surface.
Rubber bitumen can reduce driving noise by 3 to 8 decibels and has good durability. Waste tire rubber powder contains antioxidants, heat stabilizers, light shielding agents and carbon black. Adding bitumen can greatly delay the aging of bitumen and improve the quality of the mixture. The durability and social benefits of 10,000 tons of rubber bitumen require the consumption of at least 50,000 waste tires, saving 2,000 to 5,000 tons of bitumen. The waste resource recycling rate is high, the energy saving and environmental protection effect is obvious, the cost is low, the comfort is good, and the elastomer pavement is different from other pavements. Compared with stability and comfort, it is better.    
Carbon black can preserve the black color of the road surface for a long time, with high contrast with the markings and good visual induction. 5. Bitumen rock modified bitumen oil has undergone hundreds of millions of years of sedimentation changes in the rock crevices. It undergoes changes in heat, pressure, oxidation, and melting. Bitumen-like substances generated under the combined action of media and bacteria. It is a kind of natural bitumen. Other natural bitumens include lake bitumen, submarine bitumen, etc.

Chemical composition: The molecular weight of asphaltenes in rock bitumen ranges from several thousand to ten thousand. The chemical composition of asphaltenes is 81.7% carbon, 7.5% hydrogen, 2.3% oxygen, 1.95% nitrogen, 4.4% sulfur, 1.1% aluminum, and 0.18% silicon. and other metals 0.87%. Among them, the content of carbon, hydrogen, oxygen, nitrogen, and sulfur is relatively high. Almost every macromolecule of asphaltene contains polar functional groups of the above elements, which causes it to produce extremely strong adsorption force on the surface of the rock. Generation and origin: Rock bitumen is generated in the cracks of rocks. The width of the cracks is very narrow, only tens of centimeters to several meters, and the depth can reach more than hundreds of meters.
1. Buton rock bitumen (BRA): produced in Buton Island (BUTON), Sulawesi Province, Indonesia, South Pacific
2. North American rock bitumen: UINTAITE (US trade name Gilsonite) North American hard bitumen located in the Uintah Basin in the eastern part of Judea, northern United States.
3. Iranian rock bitumen: Qingdao has long-term inventory.
[4]. Sichuan Qingchuan Rock Bitumen: Discovered in Qingchuan County, Sichuan Province in 2003, it has proven reserves of more than 1.4 million tons and prospective reserves of more than 30 million tons. Belongs to Shandong Expressway.5. The rock bitumen mine discovered by the 137th Regiment of the 7th Agricultural Division of the Xinjiang Production and Construction Corps in Urho, Karamay, Xinjiang in 2001 is the earliest natural bitumen mine discovered in China. Usage and genre:
1. Directly put into the mixing cylinder of bitumen mixing station.
2. High modulus agent method, first grind the powder, and then add the matrix bitumen as a modifier.
3. Rubber powder compounding
4. Separate oil sand and unify asphaltene content. 5. Connect with the mixing station to add new application ideas online:
1. Used for flexible base layer;
2. Used for direct paving of rural roads;
3. Mix with recycled material (RAP) for thermal regeneration;
4. Use bitumen activator to compound liquid bitumen and cold mix it for the surface.
5. High modulus asphalt
6. Cast asphalt concrete