A dense asphalt mixture prepared by using modified steel slag and its preparation method

A technology of asphalt mixture and modified asphalt, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of restricting the large-scale utilization of steel slag, low production efficiency of steel slag, and long aging treatment period. , to protect the natural ecological environment, improve water stability, good low temperature crack resistance

Active Publication Date: 2022-03-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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  • A dense asphalt mixture prepared by using modified steel slag and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0043] A dense asphalt mixture prepared by using modified steel slag, the dense asphalt mixture includes the following components in parts by mass: 4 parts of SBS modified asphalt, 25 parts of basalt aggregates with a particle size of 4.75 mm to 0.075 mm, 55 parts of water-based acrylic material modified steel slag with a particle size of 4.75 mm to 16 mm, and 4 parts of limestone slag with a particle size of no more than 0.075 mm;

[0044] The water-based acrylic material modified steel slag is common converter steel slag covered with water-based acrylic material on the surface, its immersion expansion rate is less than 1.5%, and the contact angle with water is greater than 90°; the water-based acrylic material includes the following components in parts by mass:

[0045] Acrylates: 165 parts of butyl acrylate, 210 parts of methyl methacrylate;

[0046] Organosiloxane containing terminal vinyl groups: 6 parts of vinyl triethoxysilane, 2 parts of vinyl cyclotetrasiloxane;

[0...

Embodiment 2

[0060] A dense asphalt mixture prepared by using modified steel slag, the dense asphalt mixture includes the following components in parts by mass: 4.2 parts of SBS modified asphalt, 30 parts of basalt aggregates with a particle size of 4.75 mm to 0.075 mm, 60 parts of water-based acrylic material modified steel slag with a particle size of 4.75 mm to 16 mm, and 5 parts of limestone slag with a particle size of no more than 0.075 mm;

[0061] The water-based acrylic material modified steel slag is common converter steel slag covered with water-based acrylic material on the surface, its immersion expansion rate is less than 1.5%, and the contact angle with water is greater than 90°; the water-based acrylic material includes the following components in parts by mass:

[0062] Acrylates: 170 parts of butyl acrylate, 215 parts of methyl methacrylate;

[0063] Organosiloxanes containing terminal vinyl groups: 7 parts of vinyl triethoxysilane, 2 parts of vinyl cyclotetrasiloxane;

...

Embodiment 3

[0077] A dense asphalt mixture prepared by using modified steel slag, the dense asphalt mixture includes the following components in parts by mass: 4.5 parts of SBS modified asphalt, 40 parts of basalt aggregates with a particle size of 4.75 mm to 0.075 mm, 60 parts of water-based acrylic material modified steel slag with a particle size of 4.75 mm to 16 mm, and 6 parts of limestone slag with a particle size of no more than 0.075 mm;

[0078] The water-based acrylic material modified steel slag is common converter steel slag covered with water-based acrylic material on the surface, its immersion expansion rate is less than 1.5%, and the contact angle with water is greater than 90°; the water-based acrylic material includes the following components in parts by mass:

[0079] Acrylates: 175 parts of butyl acrylate, 220 parts of methyl methacrylate;

[0080] Organosiloxanes containing terminal vinyl groups: 7 parts of vinyl triethoxysilane, 2 parts of vinyl cyclotetrasiloxane;

...

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Abstract

The invention discloses a dense asphalt mixture prepared by using modified steel slag and a preparation method thereof. The composition materials of the asphalt mixture are: water-based acrylic material modified steel slag, basalt aggregate, mineral powder and modified asphalt, wherein the water-based acrylic acid The material modified steel slag is steel slag covered with water-based acrylic materials. Ammonia, Sodium Bicarbonate, Absolute Ethanol, and Distilled Water. The preparation method of the asphalt mixture is as follows: firstly, the steel slag is screened, cleaned and modified sequentially, and then the ore material gradation is designed and the modified steel slag asphalt mixture is prepared. The asphalt mixture provided by the invention has good high-temperature stability, low-temperature crack resistance and water stability, reduces the amount of asphalt, saves production costs, and is beneficial to 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/26C04B20/10C04B18/14
CPCC04B26/26C04B20/1074C04B2111/0075C04B14/14C04B18/142C04B14/28C04B20/1022C04B20/1033C04B20/1037C04B20/1051C04B20/1066C04B20/107Y02W30/91
Inventor 王声乐董从雷江磊顾兴宇
Owner SOUTHEAST UNIV
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