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Laminated silicate clay nano modified alphalt and its preparing method

A technology of layered silicate and modified asphalt, which is applied to building components, building insulation materials, buildings, etc., can solve the problems of reducing the anti-skid ability of the road surface, reducing the smoothness of the road surface, and affecting the driving safety of vehicles, so as to reduce the temperature. Sensitivity, improvement of anti-rutting ability, and effect of cost reduction

Inactive Publication Date: 2006-05-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rutting on the road surface can easily lead to: the reduction of the flatness of the road surface; the thinning of the asphalt layer at the wheel marks, which weakens the overall strength of the surface layer and the pavement structure, which is easy to induce other damage; poor drainage in rainy days reduces the anti-skid ability of the road surface; vehicles overtaking Or the direction is out of control when changing lanes, which affects the driving safety of the vehicle
It can be seen that rutting will not only significantly reduce the service life of the pavement, but also seriously affect the service level of the pavement.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0018] The present invention selects layered silicate clay as a modifier of petroleum asphalt, and adopts a melting intercalation method to obtain layered silicate clay nano-modified asphalt. The preparation method of the modified asphalt adopts the following specific steps:

[0019] (1) Grind the layered silicate clay and sieve it through a 200-600 mesh sieve.

[0020] (2) Add the sieved layered silicate clay into the molten asphalt, and the weight percentages are 0.1-20, 80-99.9 respectively.

[0021] (3) Maintain the temperature at 100-200° C., and stir at a high speed for 0.5-8 hours at a speed of 1000-6000 rpm / min to make it evenly blended to prepare layered silicate clay nano-modified asphalt.

[0022] The above-mentioned layered silicate clay is one or more mixtures of montmorillonite, accumulite or vermiculite. The clay used is a commercially available product, which can be ordinary layered silicate clay or organically modified clay, and organically modified clay is g...

Embodiment 1

[0026] Add 0.5 parts (mass parts, the same below) of organic montmorillonite (particle size: 325 mesh, interlayer distance: 2.3nm) to 99.5 parts of molten Taizhou No. 70 heavy traffic road asphalt (softening point: 47°C, penetration 75dmm), keep the temperature at 145°C, and stir at a high speed for 60min at a shear rate of 3000rpm / min to make it evenly mixed to obtain the modified asphalt product. After testing, the penetration index (PI) of Taizhou No. 70 heavy traffic asphalt is -1.042, and the rutting factor at 64°C is 0.830. The PI of the modified asphalt prepared in this example is -0.77, and the rutting factor at 64°C is 2.047 .

Embodiment 2

[0028] Add 1 part of ordinary sodium-based montmorillonite (300 mesh particle size, 1.1nm layer spacing) to 99 parts of molten Taizhou No. 70 heavy traffic road asphalt, keep the temperature at 150 °C, and shear at 3000 rpm / min Stir at a high speed for 120 minutes at a high speed to make it evenly mixed to obtain a modified asphalt product. After testing, the penetration index (PI) of Taizhou No. 70 heavy traffic asphalt is -1.042, and the rutting factor at 64°C is 0.830. The PI of the modified asphalt prepared in this example is -0.61, and the rutting factor at 64°C is 1.802 .

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Abstract

The invention supplies a method to make phyllo-silicate clay nm modification asphalt that is made up of 0.1-20% of phyllo-silicate clay and 80-99.9% of asphalt. The process includes the following steps: using the phyllo-silicate clay as modification agent for road petroleum asphalt; adding the clay into asphalt maintaining the temperature between 100 degree centigrade and 200 degree centigrade, whisking for 0.5-8 hours at the rotating speed between 1000-6000rpm / min and the modification asphalt would be gained. The invention has simple technology and has high price performance ratio.

Description

technical field [0001] The invention relates to layered silicate clay nano-modified asphalt and a preparation method thereof. Background technique [0002] Asphalt is composed of asphaltenes, colloids, aromatic hydrocarbons and saturated hydrocarbons. It is essentially a polymer mixture with extremely complex composition. Because asphalt pavement has the characteristics of combining rigidity and softness and can provide good performance, it is widely used in highway pavement construction. [0003] In recent years, with the increase of traffic volume, aggravation of axle load and channelization of traffic, rutting is the most important early failure phenomenon of asphalt pavement. After some expressway sections are opened to traffic, ruts with a depth of 10mm to 50mm will be produced after the high temperature period in the first summer, and some even reach 100mm. Rutting on the road surface can easily lead to: the reduction of the flatness of the road surface; the thinning...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08K3/34
Inventor 余剑英吴少鹏曾旋
Owner WUHAN UNIV OF TECH
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