Chemically-modified asphalt cement and preparation method thereof

Abstract

The invention discloses chemically-modified asphalt cement which is prepared from the following raw materials in parts by weight: 100 parts of matrix asphalt, 0.8-1.8 parts of an RET asphalt modifier and 0.2-0.4 part of polyphosphoric acid. In addition, the invention further discloses a preparation method of the chemically-modified asphalt cement. The method comprises the following steps: heating the matrix asphalt to 175-185 DEG C, then adding the RET asphalt modifier into the matrix asphalt, uniformly stirring, finally adding the polyphosphoric acid, and continuously stirring uniformly so as to obtain the chemically-modified asphalt cement. The chemically-modified asphalt cement disclosed by the invention is simple in production process, relatively low in production cost and good in thermal storage stability.

Description

technical field [0001] The invention belongs to the technical field of pavement asphalt materials, and in particular relates to a chemically modified asphalt binder and a preparation method thereof. Background technique [0002] In recent years, with the rapid growth of traffic volume, as well as the continuous heavy-duty and large-scale vehicles, more stringent requirements have been imposed on the road performance of asphalt pavement. Modified asphalt has been widely used in the construction of high-grade highway pavement, but most of the modified asphalt used for roads is polymer modified asphalt represented by SBS, which is relatively expensive and the modification process is complicated. Storage stability is poor. There is a huge difference in molecular weight and chemical structure between polymer modifiers and asphalt, and their compatibility is poor. They are thermodynamically incompatible systems. Therefore, special processing equipment, such as colloid mills and h...

AI Technical Summary

Problems solved by technology

However, the following three problems generally exist in polymer modified asphalt: (1) The price of polymer modifier is relatively high. The price of SBS modifier on the market is as high as 28,000 yuan per ton, and the dosage generally reaches 3wt.%. Only the above can be effective, so polymer modifiers have no price advantage; (2) The modification process is relatively complicated, requiring professional mechanical equipment such as colloid mills, and the technical level of operators is also high, which undoubtedly increases the project cost. (3) Since polymer-modified asphalt is physically modified, it is prone to segregation, so its storage stability is poor, which is not conducive to long-distance transportation and engineering construction

At present, foreign research on chemically modified asphalt is very mature, and there are already finished premixed chemically modified asphalts put into the market, and there are many practical engineering applications, and good road use effects have been achieved, but its patented technology is strictly monopolized and confidentiality

However, domestic research on chemically modified asphalt is still blank, and practical engineering applications are almost nonexistent.

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