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Modified steel slag, preparation method thereof, and application thereof in SMA asphalt concrete

An asphalt concrete and steel slag technology, applied in climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of high safety risks and costs, lack of utilization of steel slag powder, etc., to reduce production costs and achieve significant environmental benefits The effect of social benefits and good adhesion

Active Publication Date: 2019-12-24
山东高速交通建设集团有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Feng Yanjin determined the application feasibility of steel slag fine aggregate and steel slag powder in the surface layer of SMA-13 ​​asphalt concrete through relevant tests in "Research on the Application of Steel Slag Fine Aggregate and Steel Slag Powder in SMA-13 ​​Asphalt Mixture". The gradation design, road performance and economics of -13 mixtures have been studied to solve the problems of safety risks and high costs in the current application of steel slag in asphalt concrete
[0006] At present, although there are a large number of technologies that use steel slag for the preparation and design of SMA asphalt concrete, the inventors have found after research that: the current application of steel slag in asphalt concrete mainly uses large-size steel slag to replace traditional coarse aggregates. The utilization of steel slag powder is still lacking

Method used

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Examples

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preparation example Construction

[0046] As mentioned above, the development of cost-controllable and stable limestone slag substitute materials and the research on the asphalt mixture preparation process suitable for substitute materials are also key issues to be solved in the field of highway construction. To this end, the present invention provides a modified steel slag, its preparation method and its application in SMA asphalt concrete, and the present invention will be further described in conjunction with specific embodiments.

[0047] In the following examples, the steel slag is purchased from Minyuan Iron and Steel Co., Ltd., and the steel slag is electric furnace steel slag tailings, the aging time is more than 12 months, and the particle size after primary crushing is less than 10mm.

[0048] In the following examples, the red mud was purchased from Shandong Aluminum Industry Group. The red mud is an insoluble solid industrial waste discharged after the bauxite is treated with alkali to extract alumin...

Embodiment 1

[0051] A modified steel slag comprises the following components in terms of mass percentage: 80% of steel slag, 10% of white mud, and 10% of red mud; the preparation method of the modified steel slag includes the following steps:

[0052] (1) Wash the aged steel slag tailings with water to remove or remove free calcium oxide and free magnesium oxide in the steel slag, and ensure that the free calcium oxide content is not more than 2%, and dry the washed steel slag at 105°C dry for 4 hours;

[0053] (2) Grinding the steel slag aggregate after drying in step (1) by a ball mill until the passing rate of a 1.18mm standard square hole sieve is 100%, obtaining steel slag coarse powder for subsequent use;

[0054] (3) Dry the white mud at 105° C. for 4 hours, then use a ball mill to grind the dried white mud until the passing rate of the 1.18 mm standard square hole sieve is 100%, and obtain white mud coarse powder;

[0055] (4) drying the red mud at 105°C for 4 hours, and then usin...

Embodiment 2

[0063] A modified steel slag comprises the following components in terms of mass percentage: 90% of steel slag, 5% of white mud, and 5% of red mud; the preparation method of the modified steel slag includes the following steps:

[0064] (1) Wash the aged steel slag tailings with water to remove or remove free calcium oxide and free magnesium oxide in the steel slag to ensure that the content of free calcium oxide is not more than 2%, and dry the washed steel slag at 100°C Dry for 4.5 hours;

[0065] (2) Grinding the steel slag aggregate after drying in step (1) by a ball mill until the passing rate of a 1.18mm standard square hole sieve is 100%, obtaining steel slag coarse powder for subsequent use;

[0066] (3) Dry the lime mud at 100°C for 4.5 hours, and then use a ball mill to grind the dried lime mud until the passing rate of the 1.18mm standard square hole sieve is 100%, and obtain coarse powder of lime mud;

[0067] (4) drying the red mud at 100° C. for 4.5 hours, and t...

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Abstract

The invention relates to the technical field of SMA asphalt concrete, in particular to modified steel slag, a preparation method thereof, and application thereof in SMA asphalt concrete. The modifiedsteel slag comprises the following components: 80-90% of steel slag, 5-10% of white mud and 5-10% of red mud. The method comprises the following steps: washing the steel slag with water, and drying the washed steel slag until the steel slag is completely dried to ensure that the content of free calcium oxide in the obtained steel slag is not more than 2%, thereby obtaining the steel slag aggregate; then grinding the steel slag aggregate in the step (1) to obtain steel slag coarse powder; grinding the dried white mud to obtain white mud coarse powder; grinding the dried red mud to obtain red mud coarse powder; mixing the steel slag coarse powder, the white mud coarse powder and the red mud coarse powder in proportion, and then grinding the mixture to obtain the modified steel slag. The steel slag, the white mud and the red mud are used for preparing the road engineering material instead of a part of natural materials, so that the problem of excessive exploitation of natural stone is solved.

Description

technical field [0001] The invention relates to the technical field of SMA asphalt concrete, in particular to modified steel slag and its preparation method and application in SMA asphalt concrete. Background technique [0002] The information disclosed in the Background of the Invention is only intended to increase the understanding of the general background of the invention, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] With the development of my country's urban construction and infrastructure construction such as roads and railways, engineering construction consumes a large amount of non-renewable resources. Among them, after decades of destructive mining, limestone in most areas of my country has become a scarce resource. As the main pavement material of road construction in our country--asphalt concrete, the filler part is the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/02C04B18/14C04B26/26
CPCC04B18/142C04B20/023C04B26/26C04B2111/00017C04B2201/50C04B18/26C04B18/0409C04B18/0418Y02W30/91
Inventor 张西斌张吉哲姜成岭李洪印刘贵翔许尚江刘伟邢兵余四新徐琨廖莹王健胡晓庆杨万桥刘晓东李连军左建伟于潇舸
Owner 山东高速交通建设集团有限公司
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