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A kind of recycled asphalt concrete mixed with steel slag and its preparation method

A technology of asphalt concrete and recycled asphalt, which is applied in the field of highway engineering, and can solve the problems of not being able to meet the use requirements, restricting the application of recycled asphalt concrete, and high water absorption of steel slag

Active Publication Date: 2020-10-23
WUHAN INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the preparation of asphalt concrete by using waste asphalt concrete and steel slag has the following problems compared with the preparation technology of pure recycled asphalt concrete and steel slag asphalt concrete: 1. The thermal conductivity of steel slag is better than that of ordinary aggregates. Under the circumstances, the asphalt concrete structural layer has higher requirements for high temperature resistance, and this characteristic also puts forward higher requirements for the performance of the rejuvenator. The existing rejuvenator cannot meet the requirements for use in recycled asphalt concrete mixed with steel slag.
2 Steel slag has a high water absorption rate. During the mixing process, the regenerant is easily absorbed by the steel slag and cannot be well blended with the aged asphalt, so that the regenerated agent cannot effectively affect the aged asphalt.
The above problems restrict the application of recycled asphalt concrete mixed with steel slag to a large extent.

Method used

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  • A kind of recycled asphalt concrete mixed with steel slag and its preparation method
  • A kind of recycled asphalt concrete mixed with steel slag and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Classified treatment of steel slag and (waste asphalt concrete) RAP;

[0032] a. Put the steel slag on a 4.8mm screen, vibrate and sieve it, and take the steel slag on the screen for use;

[0033] b. Put the RAP on a 4.8mm sieve, vibrate and sieve it, and take the RAP under the sieve for use.

[0034] 2. Preparation of anti-aging regenerant

[0035] a. Mix industrial oil and epoxidized soybean oil according to the ratio of 60:40, control the heating temperature of the water bath to 60°C, heat and stir in the water bath for 2 hours, and obtain the base oil;

[0036] b. Mix wax crystal dispersing aid and low-temperature flow modifier at a ratio of 0.5:20, control the temperature of the water bath to 115°C, heat and stir in the water bath for 0.5 h, and obtain the compatibilizing aid;

[0037]c. Mix the obtained base oil, compatibilizer, alkylated antioxidant, SBS modifier, light absorber, and stabilizer according to the ratio of 100:10:2:1:1:0.1 and add it with high-...

Embodiment 2

[0052] 1. Grading treatment of steel slag and RAP.

[0053] a. Put the steel slag on a 5mm sieve, vibrate and sieve it, and take the steel slag on the sieve for use;

[0054] B. Put the RAP on a 5mm sieve, vibrate and sieve it, and take the RAP under the sieve for use.

[0055] 2. Preparation of anti-aging regenerant

[0056] a. Mix industrial oil and epoxidized soybean oil according to the ratio of 65:35, control the heating temperature of the water bath to 70°C, heat and stir in the water bath for 2 hours, and obtain the base oil;

[0057] b. Mix wax crystal dispersing aid and low-temperature flow modifier at a ratio of 0.7:19, control the temperature of the water bath to 125°C, heat and stir in the water bath for 0.5 h, and obtain the compatibilizing aid;

[0058] c. Mix the obtained base oil, compatibilizer, alkylated antioxidant, SBS modifier, light absorber and stabilizer according to the ratio of 100:13:1.5:30:1.5:0.1 Shearing by machine for 20 minutes, the speed of ...

Embodiment 3

[0073] 1. Grading treatment of steel slag and RAP.

[0074] a. Put the steel slag on a 5mm sieve, vibrate and sieve it, and take the steel slag on the sieve for use;

[0075] b. Put the RAP on a 5mm sieve, vibrate and sieve it, and take the RAP under the sieve for use.

[0076] 2. Preparation of anti-aging regenerant

[0077] a. Mix industrial oil and epoxidized soybean oil according to the ratio of 70:30, control the heating temperature in the water bath to 70°C, heat and stir in the water bath for 3 hours, and obtain the base oil;

[0078] b. Mix the wax crystal dispersing aid and the low-temperature flow modifier at a ratio of 0.6:19.5, control the temperature of the water bath to 125°C, heat and stir in the water bath for 1 hour, and obtain the compatibilizing aid;

[0079] c. Mix the obtained base oil, compatibilizer, alkylated antioxidant, SBS modifier, light absorber, and stabilizer according to the ratio of 100:17:1:60:1:0.5 and add it with high-speed shear Shearing...

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Abstract

The invention relates to recycled asphalt concrete mixed with steel slag. The recycled asphalt concrete is prepared from the following raw materials: steel slag, waste asphalt concrete, an ageing-resistant regenerant, mineral powder and new asphalt, wherein the ageing-resistant regenerant is prepared from base oil, a compatible aid, an alkylated antioxidant, an SBS modifier, a light absorber and astabilizer; the base oil contains industrial oil and epoxidized soybean oil; the compatible aid contains a wax crystal dispersion aid and a low-temperature flow modifier. A preparation method of recycled asphalt concrete specifically comprises the following steps: heating the steel slag, heating waste asphalt concrete and heating new asphalt; mixing and stirring the steel slag heated to the specified temperature with waste asphalt concrete, then adding new asphalt heated to the specified temperature, adding the aging-resistant regenerant, and finally adding the mineral powder to prepare the recycled asphalt concrete mixed with the steel slag. The recycled asphalt concrete has the beneficial effect that a finished product has excellent high-temperature performance, durability, water stability and secondary aging resistance.

Description

technical field [0001] The invention relates to the technical field of highway engineering, in particular to a recycled asphalt concrete mixed with steel slag and a preparation method thereof. Background technique [0002] With the development of my country's infrastructure, the total mileage of my country's road traffic has ranked first in the world. In the next 5 to 10 years, asphalt concrete-based pavement materials will gradually reach the end of their service life, and our country will enter a peak of road maintenance, renovation and reconstruction. At that time, a large amount of waste asphalt concrete (RAP) will be produced, and waste asphalt concrete will be developed. High-efficiency recycling technology has become a research hotspot. On the other hand, my country is the largest country in steel production, and the annual discharge of steel slag, a by-product of steelmaking, exceeds 100 million tons, but the current comprehensive utilization rate is very low. Gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/26
CPCC04B26/26C04B2111/00198C04B18/142C04B18/16C04B14/28C04B24/085C04B2103/0068C04B24/36C04B24/26C04B24/121C04B24/00
Inventor 沈凡庞若楠王丹白佳冉卢吉黄绍龙赵明宇王树林戴武斌
Owner WUHAN INSTITUTE OF TECHNOLOGY
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