The correct use of road construction machinery will directly affect the engineering quality of the entire highway, as well as the progress and efficiency of construction, etc. Effective maintenance and upkeep of road construction machinery is crucial to completing the entire production task. The main guarantee is that in the entire modern highway construction, the use of road construction machinery is very important.

atural bitumen: Petroleum is squeezed by the earth's crust for a long time in nature and comes into contact with air and moisture. Its light oil content gradually evaporates, and the petroleum bitumen formed by concentration and oxidation is often mixed with a certain proportion of minerals. Natural bitumen can be divided into lake bitumen, rock bitumen, submarine bitumen, oil shale, etc. according to the environment in which it is formed.
Rock bitumen is an bitumen-like substance derived from ancient petroleum seeping into the cracks of rocks, and after hundreds of millions of years of deposition, change, adsorption, and fusion, under the combined effects of heat energy, pressure, oxidation, catalysts, bacteria, etc.

Rubber powder modified bitumen (BitumenRubber, referred to as AR) is a new type of high-quality composite material. It is a new type of high-quality composite made of rubber powder made from waste tires, which is added as a modifier to the base bitumen. It is made through a series of actions such as high temperature, additives and shear mixing in a special special equipment. Material. It can extend the service life of the road surface, reduce noise, reduce vibration, improve thermal stability and thermal cracking, and improve icing resistance. Under the combined action of heavy traffic bitumen, waste tire rubber powder and admixtures, the rubber powder absorbs resins, hydrocarbons and other organic matter in the bitumen, and undergoes a series of physical and chemical changes to moisten and expand the rubber powder. The viscosity increases, the softening point increases, and the viscosity, toughness, and elasticity of rubber and bitumen are taken into account, thereby improving the road performance of rubber bitumen.

High-toughness and high-elastic modified bitumen is a chemically cross-linked special modified bitumen with a good three-dimensional modified network. Its softening point reaches above 85°C and its dynamic viscosity reaches above 580,000 Pa·s. It is a conventional high-viscosity modified bitumen. The dynamic viscosity is 3 times that of modified bitumen and has excellent high temperature performance. At the same time, its ductility reaches more than 45cm, excellent low-temperature crack resistance, elastic recovery exceeds 95%, excellent deformation recovery ability and high toughness and crack resistance.

Use SBS as the main material to screen suitable compatibilizers and their formulas. Use an ordinary mixer to add a certain proportion of masterbatch to the reactor, heat and mix it with various matrix bitumens at about 160°C, and make the masterbatch through a granulation process.

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.