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Method for preparing bituminous concrete pavement anti-rutting agent from directly-liquefied coal residue

A technology of direct coal liquefaction and asphalt concrete, applied in the field of materials, can solve the problems of high production costs of anti-rutting agents, achieve the effects of reducing material costs, simple preparation process, and significant economic benefits

Inactive Publication Date: 2010-09-29
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defect or deficiency of the high production cost of the existing anti-rutting agent, the present invention uses coal direct liquefaction residue as the main additive to prepare the anti-rutting agent, so as to achieve the purpose of reducing the comprehensive production cost of the anti-rutting agent, and at the same time provide the direct coal liquefaction High value-added applications of residues open up new fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 3000 grams of coal direct liquefaction residue, 3000 grams of high-pressure low-density polyethylene, 500 grams of No. 70 pitch, 30 grams of polyethylene wax, at 120-240 o It is mixed and extruded in the temperature range of C, and cut into 2-4mm solid anti-rutting agent by water cooling at room temperature.

[0028] The test uses the Marshall design method to determine the optimal asphalt dosage of the asphalt mixture when 0.4% of the total weight of the raw materials is added to the anti-rutting agent prepared by the present invention, and the rutting test piece and the Marshall test piece are formed under the optimal asphalt dosage condition (50 double-sided compaction), the rutting test and freeze-thaw splitting test are used to test the dynamic stability and TSR value of the asphalt mixture at 0.4% of the total weight of the anti-rutting agent as the raw material to evaluate the asphalt mixture High temperature stability and water stability performance.

[0029] When 0....

Embodiment 2

[0032] 2500 grams of coal direct liquefaction residue, 3000 grams of high-pressure low-density polyethylene, 600 grams of No. 90 asphalt, 20 grams of polyethylene wax, at 120-240 o Mixing, extrusion molding in the temperature range of C, water-cooling cutting at room temperature to make 2-4mm anti-rutting agent.

[0033] The test method is the same as in Example 1.

[0034] When 0.4% of the total weight of the raw material is added to the anti-rutting agent of the present invention in the asphalt mixture, the anti-rutting agent prepared in Example 2 is added to the asphalt concrete material to make an anti-rutting test sample. o Under the condition of wheel pressure of 0.7±0.05Mpa, the rutting resistance (dynamic stability) tested is 5076 times / mm, the result of freeze-thaw splitting test (water stability) TRS is 88%, and other technical indicators can meet the Ministry of Transport The requirements of the standard JTGF40-2004 "Technical Code for Highway Asphalt Pavement Constructio...

Embodiment 3

[0037] 2000 grams of coal direct liquefaction residue, 3000 grams of high-pressure low-density linear polyethylene, 500 grams of No. 90 asphalt, 25 grams of polyethylene wax, at 120-240 o Mixing, extrusion molding in the temperature range of C, water-cooling cutting at room temperature to make a solid anti-rutting agent of 2-4mm.

[0038] The test method is the same as in Example 1.

[0039] When 0.4% of the total weight of the raw material is added to the anti-rutting agent of the present invention in the asphalt mixture, the anti-rutting agent prepared in Example 3 is added to the asphalt concrete material to make an anti-rutting test sample. o Under the condition of wheel pressure of 0.7±0.05Mpa, the rutting resistance (dynamic stability) tested is 4937 times / mm, and the result of freeze-thaw splitting test (water stability) TRS is 91%. Other technical indicators can meet the requirements of the Ministry of Transport. The requirements of the standard JTGF40-2004 "Technical Code f...

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Abstract

The invention discloses a method for preparing a bituminous concrete pavement anti-rutting agent from directly-liquefied coal residue, comprising the following steps: respectively crushing directly-liquefied coal residue, petroleum asphalt and polyethylene into lump materials with the grain diameter smaller than 5mm; fully mixing the following components by weight percent: 30-55% of the directly-liquefied coal residue, 5-10% of the petroleum asphalt, 33-64.5% of the polyethylene and 0.5-2% of polyethylene wax; and adding the mixed raw materials in a screw extruder, mixing in the temperature range of 120-240 DEG C, and extruding the mixed materials into strip anti-rutting agent; and cooling the extruded and formed strip anti-rutting agent by utilizing a normal temperature water cooling tank, and adopting a plastic pelletizer for cutting to obtain the anti-rutting agent in a solid grain state with the grain diameter of 2-5mm. The anti-rutting agent in the invention can obviously improve the anti-rutting performance of bituminous pavement, has low cost, and can realize the purposes of waste recycling, energy conservation and emission reduction.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to the application technology of coal chemical solid waste in road construction materials, in particular to a method for preparing asphalt concrete pavement anti-rutting agent by using coal direct liquefaction residue. Background technique [0002] As we all know, in the coal-to-liquids technology, the direct coal liquefaction technology has begun large-scale industrial application in my country, but the treatment of the residue produced in the process of direct coal liquefaction has not been well resolved. [0003] Rutting is one of the most serious early diseases of asphalt concrete pavement. In order to overcome rutting, one common method is to modify asphalt, and the other is to modify asphalt concrete and add anti-rutting agent. Adding anti-rutting agent to asphalt concrete is not only low in overall cost, but also easy to operate without additional equipment, and has attracted...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26
Inventor 赵鹏艾涛王振军陈拴发
Owner CHANGAN UNIV
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