A kind of composite natural rock asphalt modifier, preparation method and application

Abstract

The invention belongs to the technical field of asphalt modification, and discloses a composite natural rock asphalt modifier, preparation method and application, according to the weight ratio of Buton rock asphalt: Iran rock asphalt = 90:10, adding 1% chemical additives for fusion . The preparation method is to dehydrate, pulverize and sieve the Buton rock asphalt for use; dehydrate, crush and sieve the Iran rock asphalt for use; prepare refined naphthenic oil as a fusion agent for use; add the Iran rock asphalt to the Buton rock asphalt Carry out physical blending, and the uniformity reaches more than 98%; add refined naphthenic oil into two kinds of rock asphalt mixtures, heat and stir until uniform; collect the obtained composite natural rock asphalt modifier. The invention can improve the high-temperature stability, water stability and other properties of the natural rock asphalt modified asphalt mixture, optimize the construction process of compounding the natural rock asphalt modifier, and improve the technical effect of the natural rock asphalt in road engineering.

Description

technical field [0001] The invention belongs to the technical field of asphalt modification, and in particular relates to a composite natural rock asphalt modifier and its preparation method and application. Background technique [0002] At present, with the rapid development of our country's economy and the rapid development of traffic construction, people pay more and more attention to the modified asphalt technology for the purpose of improving the performance of asphalt pavement. At present, in addition to conventionally used polymer chemical asphalt modifiers in road construction in my country, natural asphalt is also used in some road projects due to its good road performance. For example, Trinidad and Lake Tobago bitumen and Indonesian Buton Rock bitumen. Rock asphalt, as a kind of natural asphalt, is an asphalt product formed by petroleum minerals under long-term geological action, after complex physical and chemical actions such as high temperature, high pressure, o...

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Problems solved by technology

[0007] (2) The high temperature anti-rutting performance of natural rock asphalt modified asphalt mixture is limited

However, when the mixing ratio is low, the high-temperature anti-rutting effect of the mixture of the two kinds of natural rock asphalt-modified asphalt is poor, and its high-temperature anti-rutting performance cannot be fully exerted.

[0008] (3) Some scholars have proposed that compound modification of chemical materials such as PE, rubber powder, petroleum resin and natural rock asphalt can improve its technical performance, but the chemical structures of chemical materials and natural rock asphalt are obviously different, and they are compatible with each other Poor properties, the composite materials are difficult to be uniformly fused, and segregation and stratification are easy to occur, which in turn causes problems such as unstable modification effect

Since the mineral quality of natural rock asphalt is relatively fixed, changing the proportion of natural rock asphalt in asphalt mixture can improve certain aspects of performance to a certain extent, but at the same time, it is easy to affect other aspects of performance and fail to meet the specifications and technical requirements

[0012] 3. Conventional chemically modified materials are difficult to use in combination with natural rock asphalt

Chemical materials and natural rock asphalt have obvious chemical structure differences, and it is difficult to effectively integrate with each other, which is easy to cause delamination and segregation, which in turn causes problems such as difficult stability of properties

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