Modified asphalt

Dude: What do you want to do? Is modified asphalt used as an anti-corrosion coating? It is recommended to make the question more specific.

I recently want to prepare a feasibility study on modified asphalt, but I don’t have any relevant materials available. Could someone with expertise help me out?

Books on the production and application of petroleum asphalt, as well as introductory guides to modern technologies in the oil and petrochemical industries, such as those related to petroleum asphalt, asphalt, and asphalt mixtures, are all worth reading. In particular, the textbook \"Asphalt and Asphalt Mixtures\" (edited by Huang Xiaoming et al.) contains a chapter dedicated to modified asphalt.

Modified asphalt is an asphalt binder obtained by adding external additives (modifiers) such as rubber, resins, high-molecular polymers, ground rubber powder, or other fillers, or by applying measures such as mild oxidative treatment to asphalt, in order to improve the properties of the asphalt or asphalt mixtures. 　　There are two mechanisms for modified asphalt: one is to change the chemical composition of the asphalt, and the other is to distribute the modifier evenly within the asphalt to form a certain spatial network structure. Production method: (1) Distillation method: Crude oil is first distilled under normal pressure to separate light fractions such as gasoline, kerosene, and diesel. Subsequently, vacuum distillation (at a residual pressure of 10–100 mmHg) is used to obtain vacuum distillate oils. If the remaining residue meets the specifications for road asphalt, it can be directly used to produce asphalt products. The asphalt obtained in this way is known as straight-run asphalt, and it represents the main method for producing road asphalt. 　　(2) Solvent precipitation method: Non-polar low-molecular-weight alkane solvents have different solubilities for the various components in vacuum residue. By taking advantage of these differences in solubility, it is possible to separate the components; thus, components that are detrimental to the properties of asphalt can be removed from the vacuum residue, allowing for the production of asphalt products that meet specified requirements. This is what is known as the solvent precipitation method. 　　(3) Oxidation method: Air is blown into vacuum residue or deoiled asphalt at a certain high temperature, causing changes in its composition and properties; the resulting product is known as oxidized asphalt. Under high temperature and with the action of air, vacuum residue undergoes vaporization and evaporation, as well as a series of reactions such as dehydrogenation, oxidation, and polymerization. It is a highly complex comprehensive reaction process involving the interaction of multiple components, rather than merely an oxidation reaction; however, it is conventionally referred to as the oxidation method and oxidized asphalt, and is also known as the air-blown method and air-blown asphalt. 　　(4) Blending method: Initially, the production of asphalt through blending referred to the recombination of the 4 components that make up asphalt from the same crude oil in the proportions required by quality standards; the product obtained was called synthetic asphalt or reconstructed asphalt. With the development of processing technology, the sources of blending components have expanded. For example, residues or components from the primary and secondary processing of the same crude oil or different crude oils, as well as various industrial waste oils, can be used as blending components, which reduces the dependence on the choice of oil source in asphalt production. As suitable crude oil for asphalt production becomes increasingly scarce, the flexibility and cost-effectiveness of blending methods are receiving growing attention and widespread application. 　　(5) Emulsification method: The surface tensions of asphalt and water differ greatly, and they do not mix with each other at normal or high temperatures. However, when asphalt is subjected to mechanical actions such as high-speed centrifugation, shearing, and impact, it is transformed into particles with a particle size of 0.1–5 μm, which are then dispersed in an aqueous medium containing surfactants (emulsifiers – stabilizers). Since the emulsifiers can adsorb selectively on the surface of these asphalt particles, the interfacial tension between water and asphalt is reduced, allowing the asphalt particles to form a stable dispersion system in water; this is what constitutes an oil-in-water emulsion. This dispersion is tea-brown in color; asphalt acts as the dispersed phase while water serves as the continuous phase, and it exhibits good fluidity at room temperature. In a sense, emulsified asphalt is asphalt that has been \"diluted\" with water, thereby improving its fluidity.

The Olympic rings on the ground of the main stadium at the Beijing Olympics were made from modified asphalt; it is said that modified asphalt produced in Maoming was used, and it would be worth investigating this further

There are many types of modified asphalt, the most common being SBS modified asphalt used on highways. It is produced by using heavy traffic road asphalt and SBS as raw materials, which are thoroughly mixed and swollen under the action of a colloid mill or shear machine; in addition, small amounts of other modifying substances may be added depending on the specific circumstances, in order to significantly improve the performance of the asphalt at high and low temperatures.

SBS-modified asphalt is now widely used, and further improvements can be made to it in order to adapt to the climates of different regions, thereby enhancing its suitability

Thank you all for your help; I now have almost all the materials I need.

I have equipment for modifying asphalt and emulsified asphalt, ranging from laboratory pilot scale to industrial production use; please contact me if you need it.

Could you send one to me? Thank you. Process flow and equipment of modified asphalt. 16773724@qq.com