Dense grade asphalt mixture prepared from modified steel slag and preparation method of asphalt mixture

Abstract

The invention discloses a dense grade asphalt mixture prepared from modified steel slag and a preparation method of the asphalt mixture. The asphalt mixture comprises the following component materials: waterborne acrylic material modified steel slag, basalt aggregate, mineral powder and modified asphalt, wherein the waterborne acrylic material modified steel slag is steel slag of which the surfaceis covered by waterborne acrylic materials; and the waterborne acrylic materials comprise acrylates, organo-siloxane containing end vinyl groups, a compound emulsifier, a silane coupling agent, an initiator, an assistant, a filler, ammonium hydroxide, sodium bicarbonate, absolute ethyl alcohol and distilled water. The preparation method of the asphalt mixture comprises the following steps: screening, cleaning and modifying the steel slag, grading mineral aggregate, and preparing the modified steel slag asphalt mixture. The asphalt mixture provided by the invention has excellent high-temperature stability, low temperature anti-cracking performance and water stability, reduces the amount of asphalt, saves the production cost, and facilitates large-scale utilization of waste steel slag in road engineering.

Description

technical field [0001] The invention relates to a dense asphalt mixture prepared by using modified steel slag and a preparation method thereof, belonging to the technical field of road engineering materials. Background technique [0002] In recent years, my country's transportation construction is in a stage of rapid development. As an important part of the comprehensive transportation system, highways are closely related to the development of the national economy and people's daily travel. According to statistics, in the past few years, the total mileage of national roads and the national road density have shown a gradual increase. As of the end of 2017, the total mileage of national roads opened to traffic reached 4.7735 million kilometers, and the national road density was 49.72 kilometers per 100 square kilometers. Although my country's highway construction has made great achievements today, it is also facing a series of problems and tests. One of the key problems is the...

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Problems solved by technology

[0005] The utilization rate of steel slag in asphalt pavement has always been relatively low, mainly because steel slag contains a certain amount of free calcium oxide and magnesium oxide, which will expand in volume when hydrated with water, causing random cracking of asphalt pavement in the later stage, so water damage is the result of steel slag The main disease problem of asphalt mixture is also the problem that limits the large-scale application of steel slag in road engineering

In order to improve the water stability of steel slag asphalt concrete, steel slag must be properly pretreated before it is applied to asphalt mixture. Currently, the main pretreatment methods include aging treatment, autoclaving treatment, steam treatment and carbonation treatment. , the aging treatment cycle is long, the efficiency is low, far lower than the production efficiency of steel slag, other treatment methods are complicated to operate and the treatment cost is high, which limits the large-scale utilization of steel slag

In addition, some people use silicone resin to treat the surface of steel slag, but its brittleness is relatively high, and it needs to be completely cured under high temperature conditions and diluted by toxic solvents, which is inconvenient to operate.

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