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High-RAP-content asphalt mixture formula and preparation method

A technology of asphalt mixture and manufacturing method, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problem of unstable molecular structure and arrangement of chemical components, low temperature performance of recycled asphalt mixture and Poor water stability, failure to meet the requirements of low temperature performance and water stability, etc., to achieve the effect of compact structure, increasing the amount of asphalt, and improving water stability

Inactive Publication Date: 2015-09-23
CHINA MERCHANTS CHONGQING COMM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned rejuvenator can adjust the aged asphalt to restore its original proportion. The adjustment process of the regenerated agent will involve chemical and physical effects. The physical effect is mainly reflected in the light oil component in the regenerated agent, which can be used as a solvent for aged asphalt. Redissolve the heavy oil in the aged asphalt and adjust the synthesis ratio of each component, but the dissolving ability of the regenerant is very limited; and the chemical action mainly affects the molecular structure and arrangement of the asphalt from a microscopic point of view, making the waste asphalt However, the chemical composition, molecular structure and arrangement of recycled asphalt are quite different from those of new asphalt. The chemical composition, molecular structure and arrangement of recycled asphalt cannot exist stably. Affected by external factors such as heat, rain, etc., it is easy to re-aging, and eventually the low-temperature performance and water stability of the recycled asphalt mixture are poor, and it cannot meet the low-temperature requirements specified in the "Technical Specifications for Highway Asphalt Pavement Construction" (JTGF40-2004). Performance and Water Stability Requirements

Method used

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  • High-RAP-content asphalt mixture formula and preparation method
  • High-RAP-content asphalt mixture formula and preparation method
  • High-RAP-content asphalt mixture formula and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of asphalt mixture formula with high content of RAP, the mass percentage of its components is as follows:

[0031] 45% milling old material;

[0032] 48.3% aggregates, aggregates include coarse aggregates and fine aggregates, coarse aggregates are made of crushed stones, crushed gravel, and steel slag, and fine aggregates are made of natural sand, machine-made sand, and stone chips.

[0033] 1.5% mineral powder, the mineral powder is finely ground from strong basic rock in limestone or igneous rock.

[0034] 1.5% ordinary portland cement;

[0035] 0.3% of polyester fibers with a length of 6 mm;

[0036] 3.4% No. 90 base asphalt.

[0037] Experimental design: Design 4 test groups of recycled asphalt mixture. The main difference between these 4 test groups is that the amount of polyester fiber is 0.2%, 0.3%, 0.4%, and 0.5%.

[0038] The 0.3% test group is Example 1.

[0039] 0.2% The mass percentage of each component of the test group: 45% milling old material...

Embodiment 2

[0051] A kind of asphalt mixture formula with high content of RAP, its mass percentage is as follows:

[0052] 50% milling old material;

[0053] 43.3% of the aggregate, the aggregate includes coarse aggregate and fine aggregate, the coarse aggregate is composed of crushed stone, crushed gravel, and steel slag, and the fine aggregate is composed of natural sand, machine-made sand, and stone chips.

[0054] 1.5% mineral powder, the mineral powder is finely ground from strong basic rock in limestone or igneous rock.

[0055] 1.5% ordinary portland cement;

[0056] 0.3% of polyester fibers with a length of 6mm;

[0057] 3.4% No. 90 base asphalt.

[0058] Experimental design: Design 4 test groups of recycled asphalt mixture. The difference between these 4 test groups is that the amount of polyester fiber is 0.2%, 0.3%, 0.4%, and 0.5%.

[0059] The 0.3% test group is Example 2.

[0060] 0.2% The mass percentage of each component of the test group: 50% old milling material; 43....

Embodiment 3

[0071] The manufacturing method of asphalt mixture with high RAP content, the steps are as follows:

[0072] (1) Preheat the old milling material at 110°C for 2 hours;

[0073] (2) Add the milling old material preheated in step (1) into the mixing pot, and the temperature of the mixing pot is 175°C;

[0074] (3) Then add the preheated aggregates into the mixing pot (the preheating temperature of the aggregates is 180°C, and the preheating time is 4 to 5 hours), and at the same time add polyester fibers with a length of 6mm, and mix for 90s;

[0075] (4) Add preheated No. 90 base asphalt (the preheating temperature of No. 90 base asphalt is 150-160°C), preheating time is 4-5 hours, and mixing for 90s;

[0076] (5) Add slag powder (the slag powder is ground from strong basic rock in limestone or magmatic rock, the preheating temperature is 180°C, and the preheating time is 4-5h) and mix for 90s.

[0077] The mass percent of each component of the asphalt mixture formula in embo...

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Abstract

The invention belongs to the technical fields of road paving materials and processing and preparation thereof. A high-RAP-content asphalt mixture formula comprises the following components in percentage by weight: 40-65% of milled waste material, 30-50% of aggregate, 1.5% of mineral powder, 1.5% of ordinary portland cement, 0.3% of polyester fiber or basalt fiber, 2.8-3.9% of substrate asphalt. The content of RAP can be increased to 40-65%.

Description

technical field [0001] The invention belongs to the technical field of road pavement materials and their processing and preparation. Background technique [0002] Asphalt mixture is a mixture of ore (including coarse aggregate, fine aggregate and mineral powder) mixed with asphalt, and some external admixtures are added if necessary, of which the coarse aggregate mainly acts as a skeleton. The fine aggregate mainly plays the role of filling, and the cement composed of asphalt and mineral powder mainly plays the role of cementing and filling. The asphalt mixture will face the problem of aging after being paved into asphalt pavement. The aging of asphalt mixture is mainly caused by the aging of asphalt. Oxygen reaction changes the composition of asphalt; ③The molecular structure of asphalt produces thixotropic steric hindrance and hardens. [0003] Because the stacking of waste asphalt mixture (RAP) will cause environmental pollution and at the same time, for the considerati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B26/26C04B18/16C04B14/38C04B16/06
CPCY02W30/91
Inventor 周刚李培国王火明陈天泉沈金生李汝凯陈飞黄勇徐周聪马莲霞
Owner CHINA MERCHANTS CHONGQING COMM RES & DESIGN INST
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